JP3933436B2 - Plastic building materials - Google Patents

Description

【００７６】
【表２】

【００７７】
【発明の効果】
本発明に係るプラスチック建材は、エラストマー成分４〜３０重量％に塩化ビニルを主成分とするビニルモノマー７０〜９６％がグラフト共重合されて得られた塩化ビニル系樹脂１００重量部に、針状もしくは板状無機物が２０〜６０重量部の割合で含有されている組成物からなるため、十分な耐衝撃性及び機械的強度を有する。また、線膨張率が低いため、温度変化による変形や破損も生じ難い。
【図面の簡単な説明】
【図１】実施例及び比較例で成形体を得るのに用いられた成形装置の概略構成図。
【図２】（ａ）及び（ｂ）は、それぞれ、実施例１及び実施例７で得られた成形体としての雨樋の横断面図。
【符号の説明】
７…成形体
７Ａ…成形体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plastic building material used for, for example, a rain gutter, and more particularly to a plastic building material having a low linear expansion coefficient and excellent impact resistance.
[0002]
[Prior art]
Conventional rain gutters are generally composed of hard vinyl chloride resin molded products. However, rain gutters made of hard vinyl chloride resin have a linear expansion coefficient of 8 × 10.^-FiveWhen it is fixed to a building with a joint or the like, it expands and contracts greatly due to temperature changes in summer and winter and day and night. Therefore, a rain gutter made of hard vinyl chloride resin may be damaged or deformed.
[0003]
In order to prevent the damage and deformation, it is necessary to reduce the linear expansion coefficient. Therefore, a rain gutter in which the surface of a steel plate is coated with a vinyl chloride resin has been proposed and put into practical use. Further, as described in Japanese Utility Model Publication No. 59-196622, a rain gutter obtained by adding a glass fiber net, an inorganic fiber or an inorganic filler to a synthetic resin has been proposed.
[0004]
[Problems to be solved by the invention]
In a rain gutter whose surface is covered with a vinyl chloride resin, the steel plate portion is exposed at the end face produced by cutting. Therefore, rust was easily generated on the end face. In addition, since steel plates are used, there is a problem that rain gutters tend to be heavy and recycling is difficult.
[0005]
On the other hand, a rain gutter made of a material in which a fiber net is combined with a synthetic resin requires a plurality of steps such as molding of a core material and molding of a product. Therefore, the manufacturing cost is increased. In addition, when glass fiber nets, inorganic fibers or inorganic fillers are added, there is a problem that impact resistance is remarkably lowered.
[0006]
The object of the present invention is a plastic building material that eliminates the above-mentioned drawbacks of the prior art, has a low coefficient of linear expansion, is unlikely to be damaged or deformed due to temperature changes, has excellent impact strength, and has no risk of rusting on the end face. It is to provide.
[0007]
[Means for Solving the Problems]
  That is, according to the first invention of the present invention,100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 600 to 1500, obtained by graft polymerization of 70 to 96% by weight of a vinyl monomer containing vinyl chloride as a main component to 4 to 30% by weight of an elastomer component;It consists of wollastonite having an average particle diameter of 2 to 50 μm and an aspect ratio of 5 or more measured by a laser particle size distribution meter.Resin composition containing 20-60 parts by weight of acicular inorganic materialExtruded by an extruderIt is characterized byA plastic gutter is provided.
[0008]
  According to a second aspect of the present invention, in the first aspect, the elastomer component is, 100 parts by weight of a radically polymerizable monomer mainly composed of at least one (meth) acrylate having a glass transition temperature of -140 ° C. or higher and lower than 0 ° C., and a polyfunctional monomer of 0.1 to 10 wt. An acrylic copolymer containing a partA plastic gutter characterized by the above is provided.
[0009]
  According to a third aspect of the present invention, in the first aspect, the elastomer isA copolymer 40 comprising 100 parts by weight of (meth) acrylate having a glass transition temperature of -140 ° C or higher and lower than -60 ° C and 0.1 to 1 part by weight of a polyfunctional monomer, and forming a core layer. In order to form a shell layer with respect to ˜90 wt%, the homopolymer has a glass transition temperature of −60 ° C. or more and less than 0 ° C. and contains 100 parts by weight of a radically polymerizable monomer mainly composed of (meth) acrylate. It is an elastomer having a core-shell structure obtained by graft copolymerization of 10 to 60% by weight of a mixed monomer composed of 1.5 to 10 parts by weight of a functional monomer.A plastic gutter characterized by the above is provided.
[0010]
  Furthermore, according to a fourth invention of the present invention, there is provided a plastic rain gutter according to any one of the first to third inventions, wherein a high weather resistant resin layer is formed on the surface layer by coextrusion. Is done.Examples of the resin constituting the highly weather resistant resin layer include acrylic resins and styrene copolymer resins.
[0011]
Details of the present invention will be described below.
In the present invention, the elastomer component is not particularly limited as long as it can be graft copolymerized with vinyl chloride, but an acrylic copolymer or an ethylene-vinyl acetate copolymer is preferably used.
[0012]
Among them, the above-mentioned first elastomer, that is, a homopolymer, having a glass transition temperature of −140 ° C. or higher and lower than 0 ° C., 100 parts by weight of a radically polymerizable monomer having at least one (meth) acrylate as a main component. And an acrylic copolymer comprising 0.1 to 10 parts by weight of a polyfunctional monomer is preferably used.
[0013]
When (meth) acrylate having a glass transition temperature of 0 ° C. or higher is used, sufficient impact resistance may not be exhibited in the finally obtained plastic building material. The glass transition temperature is not particularly limited as long as it is lower than 0 ° C, but considering the glass transition temperature of polymers generally used in industry, the glass transition temperature of a homopolymer is suitably -140 ° C or higher. is there.
[0014]
In the present invention, the polyfunctional monomer used for the elastomer increases the impact resistance of the vinyl chloride graft copolymer resin, and further increases the impact resistance of the acrylic copolymer particles when the acrylic copolymer is produced and after the production. It is blended to suppress coalescence.
[0015]
As said polyfunctional monomer, as di (meth) acrylate, for example, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,6-hexanediol di ( Examples of the tri (meth) acrylate include trimethylolpropane tri (meth) acrylate, ethylene oxide-modified trimethylolpropane tri (meth) acrylate, and pentaerythritol. And tri (meth) acrylate. Other polyfunctional monomers include pentaerythritol tetra (meth) acrylate, dipentaerythrole hexa (meth) acrylate, diallyl phthalate, diallyl malate, diallyl fumarate, diallyl succinate, triallyl isocyanurate, etc. Or divinyl compounds such as divinylbenzene and butadiene. As for the said polyfunctional monomer, only 1 type may be used and 2 or more types may be used together.
[0016]
The blend ratio of the polyfunctional monomer in the acrylic copolymer as the first preferred elastomer is such that the glass transition temperature of the homopolymer forming the acrylic copolymer is −140 ° C. or higher and lower than 0 ° C. ( The amount is 0.1 to 10 parts by weight with respect to 100 parts by weight of the radical polymerizable monomer mainly composed of (meth) acrylate. When the blending ratio of the polyfunctional monomer is less than 0.1 parts by weight, the acrylic copolymer cannot maintain an independent particle shape in the vinyl chloride graft copolymer resin, and the impact resistance may decrease. is there. On the other hand, when the amount exceeds 10 parts by weight, the crosslink density of the acrylic copolymer is increased, and the impact resistance may be lowered.
[0017]
In the present invention, the method of copolymerizing the radical polymerizable monomer mainly composed of the acrylic monomer and the polyfunctional monomer is not particularly limited, and examples thereof include an emulsion polymerization method and a suspension polymerization method. It is done. Among them, the emulsion polymerization method is desirable because the impact resistance can be sufficiently enhanced and the particle size of the acrylic copolymer is easily controlled. The copolymerization includes all forms of copolymerization such as random copolymerization, block copolymerization, and graft copolymerization.
[0018]
The emulsion polymerization method can be performed by a conventionally known method. For example, an emulsion dispersant, a polymerization initiator, a Ph adjuster, an antioxidant, and the like may be added as necessary.
[0019]
Furthermore, as the elastomer component, the second preferred elastomer described above, that is, having a core layer mainly composed of (meth) acrylate having a glass transition temperature of −140 ° C. or higher and lower than −60 ° C. of the homopolymer. An acrylic copolymer having a core-shell structure in which a radical polymerizable monomer mainly composed of (meth) acrylate having a glass transition temperature of −55 ° C. or higher and lower than 0 ° C. constitutes a shell layer is more preferable.
[0020]
When the glass transition temperature of the (meth) acrylate homopolymer forming the core layer is −140 ° C. or higher and lower than −60 ° C., even more sufficient impact resistance is exhibited. If it is -60 ° C or higher, the impact resistance may be reduced. In addition, about the minimum of the glass transition temperature of the homopolymer of (meth) acrylate which forms a core layer, since the glass transition temperature of the polymer generally used is -140 degreeC or more, -140 degreeC or more is suitable. It is.
[0021]
Examples of the (meth) acrylate having a homopolymer glass transition temperature of −140 ° C. or higher and lower than −60 ° C. include n-heptyl acrylate, n-octyl acrylate, 2-methylheptyl acrylate, 2-ethylhexyl acrylate, n- Nonyl acrylate, 2-methyloctyl acrylate, 2-ethylheptyl acrylate, n-decyl acrylate, 2-methylnonyl acrylate, 2-ethyloctyl acrylate, and the like can be given. These (meth) acrylates may be used alone or in combination of two or more.
[0022]
The glass transition temperature of the homopolymer of (meth) acrylate having a glass transition temperature of −140 ° C. or more and less than −60 ° C. is described in “Polymer Data Handbook (Basic)” edited by the Society of Polymer Science. (1986, Bafukansha).
[0023]
The (meth) acrylate having a glass transition temperature of −60 ° C. or more and less than 0 ° C. is polymerized in the presence of the core polymer to form the main component of the shell layer, and from the vinyl chloride resin composition It is used to increase the impact resistance of the resulting plastic building material and to cover the low glass transition temperature polymer of the core layer to reduce the adhesiveness of the acrylic copolymer particles.
[0024]
Therefore, the glass transition temperature of the homopolymer is desirably −60 ° C. or higher, and a certain degree of flexibility needs to be maintained. Examples of the (meth) acrylate having a glass transition temperature of the homopolymer of −60 ° C. or more and less than 0 ° C. include ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl (meth) acrylate, isobutyl acrylate, sec-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, cumyl acrylate, n-heptyl methacrylate, n-octyl methacrylate, 2-methylheptyl methacrylate, 2-ethylhexyl methacrylate, n-nonyl methacrylate, 2-methyloctyl methacrylate 2-ethylheptyl methacrylate, n-decyl methacrylate, 2-methylnonyl methacrylate, 2-ethyloctyl methacrylate, lauryl (meth) acrylate, and the like. And the like.
[0025]
In addition, as for the (meth) acrylate whose glass transition temperature of the said homopolymer is -60 degreeC or more and less than 0 degreeC, only 1 type may be used and 2 or more types may be used together.
The glass transition temperature of the homopolymer is described in “Polymer Data Handbook (Basic)” edited by the Society of Polymer Science, Japan (1986, Baifukan Co., Ltd.).
[0026]
In the second preferred elastomer, the homopolymer has a glass transition temperature of −140 ° C. or more and less than −60 ° C. and 100 parts by weight of (meth) acrylate and 0.1 to 1 part by weight of a polyfunctional monomer, 100 parts by weight of a radically polymerizable monomer mainly composed of (meth) acrylate having a glass transition temperature of −60 ° C. or higher and lower than 0 ° C. with respect to the copolymer forming the core layer, and a polyfunctional monomer A mixed monomer composed of 1.5 to 10 parts by weight is graft-copolymerized to form an elastomer having a core-shell structure. The polyfunctional monomer used here is the same as the polyfunctional monomer used in the first preferred elastomer described above.
[0027]
Further, in the composition constituting the core layer in the second preferred elastomer, if the blending ratio of the polyfunctional monomer is less than 0.1 part by weight, the elastomer maintains an independent particle shape in the vinyl chloride graft copolymer resin. The impact resistance may be reduced. On the other hand, when the amount exceeds 1 part by weight, the crosslink density of the elastomer becomes high, and the impact resistance may also be lowered.
[0028]
Similarly, in the monomer composition for forming the shell layer, if the blending ratio of the polyfunctional monomer is less than 1.5 parts by weight, the elastomer may not maintain an independent particle shape in the vinyl chloride graft copolymer resin. And impact resistance may be reduced. On the other hand, when the amount exceeds 10 parts by weight, the crosslink density of the acrylic copolymer is increased, and the impact resistance may be lowered.
[0029]
The weight ratio of the core layer to the shell layer is preferably in the range of 40:60 to 90:10. When the core layer is less than 40% by weight, sufficient impact resistance may not be exhibited, and when the core layer exceeds 90% by weight, the shell layer may be non-uniform, and the acrylic copolymer particles It may not be possible to sufficiently reduce the tackiness.
[0030]
The vinyl chloride resin in the present invention is obtained by graft polymerization of 4 to 30% by weight of the elastomer component with 70 to 96% by weight of a vinyl monomer containing vinyl chloride as a main component. When the content of the elastomer component is less than 4% by weight, sufficient impact resistance is not exhibited when a predetermined amount of inorganic material is added. When the content ratio of the elastomer component exceeds 30% by weight, the mechanical strength of the plastic building material is lowered. Moreover, there exists a possibility that the moldability of a plastic building material may worsen. The content of the elastomer component is more preferably 6 to 20% by weight.
[0031]
The average degree of polymerization of the vinyl chloride resin in the present invention is in the range of 600-1500. The average degree of polymerization is a value measured by the method described in JIS K6721.
[0032]
When the average degree of polymerization is less than 600, the mechanical strength of the plastic building material is low, and when it exceeds 1500, the moldability is significantly reduced.
The average particle size of the elastomer component in the vinyl chloride resin is preferably in the range of 0.01 to 1 μm. When the average particle size is smaller than 0.01 μm, a large number of fine particles are contained, which may adhere to the mold at the time of molding or cause an appearance defect of the obtained plastic building material. When the average particle diameter is larger than 1 μm, both impact resistance and mechanical strength may be lowered, which is not preferable.
[0033]
The method of graft copolymerizing vinyl chloride with the elastomer component is not particularly limited, and for example, suspension polymerization method, emulsion polymerization method, solution polymerization method, bulk polymerization method and the like are used. Among these, the suspension polymerization method is preferably used.
[0034]
When graft copolymerization is performed by the suspension polymerization method, a dispersant, a polymerization initiator, or the like may be used.
The dispersing agent is not particularly limited, and those that can increase the dispersibility stability of the elastomer component and can efficiently perform graft polymerization of vinyl chloride are used as appropriate. Examples of the dispersant include poly (meth) acrylate, (meth) acrylate-alkyl acrylate copolymer, methylcellulose, ethylcellulose, hydroxypropylmethylcellulose, polyethylene glycol, polyvinyl acetate and partially saponified product thereof, gelatin , Polyvinyl pyrrolidone, starch, maleic anhydride-styrene copolymer, and the like. Only 1 type of dispersing agent may be used and 2 or more types may be used together.
[0035]
The polymerization initiator is not particularly limited, but a radical polymerization initiator is preferably used because it is advantageous for graft copolymerization. Examples of the radical polymerization initiator include lauroyl peroxide, t-butyl peroxypivalate, diisopropyl peroxydicarbonate, dioctyl peroxydicarbonate, t-butyl peroxyneodecanoate, α-cumylperoxyneodecane. And organic peroxides such as noate, and azo compounds such as 2,2-azobisisobutyronitrile and 2,2-azobis-2,4-dimethylvaleronitrile.
[0036]
When grafting vinyl chloride, a flocculant may be added to the dispersion solution of the elastomer component in order to reduce the scale adhering in the polymerization vessel. Furthermore, you may add Ph adjuster, antioxidant, etc. as needed.
[0037]
The vinyl chloride graft copolymer obtained by the production method as described above has a structure in which a part of polyvinyl chloride is directly bonded to the elastomer component. Therefore, it is excellent in impact resistance and mechanical strength.
[0038]
By using a composition in which 20 to 60 parts by weight of a needle-like or plate-like inorganic substance is blended with 100 parts by weight of the above-mentioned vinyl chloride resin, it is excellent in impact resistance and mechanical strength and is formed according to the present invention. A plastic building material having a small expansion coefficient can be obtained.
[0039]
If the added amount of the inorganic substance is less than 20 parts by weight, the linear expansion coefficient cannot be lowered, and if it exceeds 60 parts by weight, impact resistance and molding processability are deteriorated.
Examples of the needle-like inorganic substance include wollastonite (wollastonite), potassium titanate, basic magnesium sulfate, sepiolite, zonotlite, aluminum borate, and the like. Examples of the plate-like inorganic substance include talc, mica, and the like. Synthetic hydrosartite can be mentioned. Of these, wollastonite is preferably used.
[0040]
In this specification, “needle shape” means a shape whose major axis is three times or more the minor axis, and includes shapes such as a weight-proof shape and a cylindrical shape. Further, the plate shape includes a scaly shape and a flake shape.
[0041]
The needle-like or plate-like inorganic substance preferably has an average particle diameter of 2 to 50 μm and an aspect ratio (= major axis / minor axis or thickness) of 5 or more as measured with a laser particle size distribution meter.
[0042]
Among the inorganic substances, considering the effect of improving the linear expansion coefficient and cost, wollastonite is particularly preferable as the acicular inorganic substance, and mica is particularly preferable as the plate-like inorganic substance.
[0043]
In order to increase the affinity with the vinyl chloride graft copolymer, surface treatment may be applied to wollastonite or mica with a silane coupling agent, an organic titanate or a fatty acid.
[0044]
The method of mixing the inorganic substance with the vinyl chloride graft copolymer is not particularly limited, and a method of blending the inorganic substance with the vinyl chloride graft copolymer in advance using a Henschel mixer or the like, and the inorganic substance from the middle of the extruder. And the like may be added separately.
[0045]
When molding building materials such as rain gutters using vinyl chloride resin, heat stabilizers, stabilization aids, lubricants, processing aids, antioxidants, light stabilizers, pigments, fillers, etc., as necessary It may be added.
[0046]
The heat stabilizer is not particularly limited. Organotin stabilizers such as dibutyltin laurate polymer; lead stabilizers such as lead stearate, dibasic lead phosphite, tribasic lead sulfate; calcium-zinc stabilizer, barium-zinc stabilizer, Examples thereof include barium-cadmium stabilizers. These may be used alone or in combination of two or more.
[0047]
The stabilizing aid is not particularly limited, and examples thereof include epoxidized soybean oil, epoxidized linseed bean oil, epoxidized tetrahydrophthalate, epoxidized polybutadiene, and phosphate ester. These may be used independently and may use 2 or more types together.
[0048]
The lubricant is not particularly limited, and examples thereof include an acrylic processing aid that is an alkyl acrylate / alkyl methacrylate copolymer having a weight average molecular weight of 100,000 to 2,000,000. Specific examples include n-butyl acrylate / Examples thereof include a methyl methacrylate copolymer and a 2-ethylhexyl acrylate / methyl methacrylate / butyl methacrylate copolymer. These may be used alone or in combination of two or more.
[0049]
It does not specifically limit as said antioxidant, For example, a phenolic antioxidant etc. are mentioned. These may be used alone or in combination of two or more.
The light stabilizer is not particularly limited, and examples thereof include salicylic acid ester-based, benzophenone-based, benzotriazole-based, cyanoacrylate-based ultraviolet absorbers, and hindered amine-based light stabilizers. These may be used alone or in combination of two or more.
[0050]
The pigment is not particularly limited, and examples thereof include organic pigments such as azo-based, phthalocyanine-based, selenium-based, dye lake-based, oxide-based, molybdenum chromate-based, sulfide-based / selenium compounds, ferrocyanide-based, and the like. And inorganic pigments. These may be used alone or in combination of two or more.
[0051]
The filler is not particularly limited, and examples thereof include calcium carbonate. These may be used alone or in combination of two or more.
Moreover, in order to improve the workability at the time of molding in order to obtain a plastic building material, a plasticizer may be added to the vinyl chloride resin. The plasticizer is not particularly limited, and examples thereof include dibutyl phthalate, di-2-ethylhexyl phthalate, and di-2-ethylhexyl adipate. One type of plasticizer may be used, or two or more types of plasticizers may be used in combination.
[0052]
The method for mixing the various additives and plasticizers described above with the vinyl chloride resin is not particularly limited, and examples thereof include a method using bot blend and a method using cold blend.
[0053]
In addition, in plastic building materials such as rain gutters, it is preferable to coat the surface with a highly weather resistant resin in order to increase the weather resistance. As such a high weather resistance resin, in the present invention, a resin excellent in weather resistance as compared with a portion made of a resin composition containing the above vinyl chloride resin and an inorganic substance, for example, a styrene resin than an acrylic resin. Polymerized resin or the like is used. The method for forming such a highly weather resistant resin layer as a surface layer is not particularly limited. For example, a resin composition composed of the vinyl chloride resin and an inorganic material, and a styrene copolymer resin for constituting the surface layer. A method of molding by coextrusion of a highly weather resistant resin such as the above is preferably used.
[0054]
In addition, the surface layer which consists of said high weather resistance resin may be formed partially, and may be formed so that the whole outer peripheral surface may be coat | covered.
Although the plastic building material which concerns on this invention is used suitably for a rain gutter, it can be applied also to various building materials arrange | positioned outdoors other than a gutter.
[0055]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail by giving specific examples of the present invention, but the present invention is not limited to the following examples.
[Example 1]
(Adjustment of acrylic copolymer)
50 parts by weight of 2-ethylhexyl acrylate, 0.1 parts by weight of trimethylolpropane triacrylate (TMPTA), 0.5 parts by weight of polyoxyethylene nonyl ether ammonium sulfate, and 35 parts by weight of pure water are mixed, and the core layer A forming emulsion monomer was prepared. Further, 30 parts by weight of n-butyl acrylate, 1.5 parts by weight of TMPTA, 0.3 parts by weight of polyoxyethylene nonylphenyl ether ammonium sulfate, and 25 parts by weight of pure water are mixed, and a monomer mixture liquid for shell layer formation is prepared. Prepared.
[0056]
Next, in a reaction vessel equipped with a stirrer and a reflux condenser, 20 parts by weight of 2-ethylhexyl acrylate, 0.04 part by weight of TMPTA, 0.2 part by weight of polyoxyethylene nonylphenyl ether ammonium sulfate, and 180 parts by weight of pure water And the oxygen in the vessel was replaced with nitrogen, and then the reaction vessel was heated to 70 ° C. under stirring conditions. After completion of the temperature increase, 0.1 parts by weight of ammonium persulfate (polymerization initiator) was added to the reactor for reaction, and then the core layer-forming emulsion monomer prepared as described above was added dropwise for polymerization.
[0057]
Immediately after the dropping of the emulsion monomer for forming the core layer was completed, the monomer solution for forming the shell layer was added dropwise. The dripping of all the monomers was completed in 3 hours, and then aged for 1 hour to complete the polymerization. As a result, an acrylic copolymer latex having a solid content concentration of 30% by weight was obtained.
[0058]
(Preparation of vinyl chloride graft copolymer)
In a polymerization vessel equipped with a stirrer and a jacket, a 3% by weight aqueous solution of 170 parts by weight of pure water, 7 parts by weight of the above-mentioned acrylic copolymer latex, and partially saponified polyvinyl alcohol (Kuraray Co., Ltd., Kuraray Poval L-8) 5 Part by weight, 2.5 parts by weight of a 3% by weight aqueous solution of hydroxypropylmethylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd., product number: Metrose 60SH50), 0.03 parts by weight of t-butyl peroxypivalate, and aluminum sulfate in an acrylic system. Aluminum ions were collectively added to 7 parts by weight of the polymer solid content to 2500 ppm, and then the air in the polymerization vessel was discharged with a vacuum pump, and further 100 parts by weight of vinyl chloride was added under stirring conditions. Thereafter, the graft polymerization was started at a polymerization temperature of 57.5 ° C. by controlling the jacket temperature.
[0059]
When the pressure in the polymerization vessel is reduced to 0.72 MPa, the polymerization rate of the vinyl chloride monomer becomes 80%, so the reaction is completed and an antifoaming agent (product made by Toray Industries, Inc.) is used to stop the reaction. Name: Toray Silicon SH5510) was added under pressure to stop the reaction, and then the unreacted vinyl chloride monomer was removed and dehydrated to obtain a vinyl chloride resin. The degree of polymerization of polyvinyl chloride in the obtained vinyl chloride resin was about 1000.
[0060]
(Preparation of vinyl chloride resin composition)
For 100 parts by weight of the obtained vinyl chloride resin, 2 parts by weight of a tin-based stabilizer (manufactured by Sansha Kikai Co., Ltd., product number: ONZ-142F) and polyethylene wax (manufactured by Mitsui Petrochemical Co., Ltd., product number: HIWAX220MP) as a lubricant are used. ) 0.5 parts by weight and Sakai Chemical Co., Ltd., product number: 0.5 parts by weight of SC100, processing aid (Mitsubishi Rayon Co., product number: P501A) 3.0 parts by weight, wollastonite (Kinseimatic) After adding 40 parts by weight, manufactured by Kogyo Co., Ltd., product number: SH600, the mixture was stirred and mixed with a super mixer (product number: 100 L, manufactured by Kawata Co., Ltd.) to obtain a vinyl chloride resin composition.
[0061]
(Rain forming)
Using the molding machine shown in FIG. 1, rain gutters were molded using the vinyl chloride resin composition. In FIG. 1, 1 is a feeder, 2 is an extruder, 3 is a feeder for a surface layer resin, 4 is a surface layer extruder, 5 is a mold, and 6 is a cooling sizing. That is, using the extruder 2 in FIG. 1 (φ50 mm different direction twin screw extruder, manufactured by PLABOR), the vinyl chloride resin composition was melt-kneaded at 195 ° C., extruded from the mold 5, and then cooled sizing. 6 and cooling and sizing were performed to obtain a molded body 7 having a U-shaped cross section as a rain gutter. Fig.2 (a) shows the cross section of the molded object 7 obtained in this way. In this cross-sectional shape, the thickness of the molded body 7 is about 1.5 mm.
The molded body 7 obtained as described above was evaluated in the following manner. The results are shown in Table 1 below.
[0062]
(Linear expansion coefficient)
About the said molded object, the linear expansion coefficient was measured according to the linear expansion test method (JISK7197) of a plastic. The measurement temperature is 0 ° C. to 50 ° C., the heating rate is 5 ° C./min, and the unit is 10 ° C.^-Five/ ° C.
[0063]
(Impact resistance)
In accordance with JIS K 7110, Izod impact strength was measured at 0 ° C. to evaluate impact resistance. The unit is KJ / m²It is.
[0064]
[Example 2]
Except that the blending ratio of the acrylic copolymer was changed from 7 parts by weight to 10 parts by weight, a molded body was produced and evaluated in the same manner as in Example 1. The results are shown in Table 1 below.
[0065]
[Example 3]
A molded body was produced and evaluated in the same manner as in Example 2 except that the content of wollastonite (manufactured by Kinseimatic Co., Ltd., product number: SH600) was 30 parts by weight. The results are shown in Table 1 below.
[0066]
[Example 4]
A molded body was prepared and evaluated in the same manner as in Example 2 except that the content of wollastonite (manufactured by Kinseimatic Co., Ltd., product number: SH600) was 40 parts by weight. The results are shown in Table 1 below.
[0067]
Example 5(Reference example)A molded body was prepared and evaluated in the same manner as in Example 2 except that 30 parts by weight of mica (manufactured by Otsuka Chemical Co., Ltd., product number: A300) was used in place of wollastonite as an inorganic substance. The results are shown in Table 1 below.
[0068]
Example 6(Reference example)A molded body was prepared and evaluated in the same manner as in Example 5 except that the mixing ratio of mica was 40 parts by weight. The results are shown in Table 1 below.
[0069]
[Example 7]
A single extruder 4 (φ30 mm: manufactured by PLABOR) was used for covering the surface layer, and AES resin (manufactured by A & L Japan, product number: Unibright UB-400) was melt-kneaded at 190 ° C. A molded article for rain gutter was molded in the same manner as in Example 2 except that it was co-extruded with the composition. FIG. 2B shows a cross section of the obtained molded body 7A. The thickness of the surface layer is 0.2 mm, and the thickness of the main body portion made of the vinyl chloride resin composition is 1.5 mm. The linear expansion coefficient and Izod impact value of the obtained molded body were evaluated in the same manner as in Example 1. The results are shown in Table 1 below.
[0070]
Example 8(Reference example)] A rain gutter was molded and evaluated in the same manner as in Example 7 except that 40 parts by weight of mica (manufactured by Otsuka Chemical Co., Ltd., product number: A300) was used as an inorganic substance instead of wollastonite. The results are shown in Table 1 below.
[0071]
[Comparative Example 1]
A molded body was prepared and evaluated in the same manner as in Example 1 except that the blending ratio of the acrylic copolymer in the vinyl chloride resin was changed from 7 parts by weight to 2 parts by weight. The results are shown in Table 2 below.
[0072]
[Comparative Example 2]
A molded body was produced and evaluated in the same manner as in Example 1 except that the blending ratio of the acrylic copolymer in the vinyl chloride resin was changed from 7 parts by weight to 35 parts by weight. The results are shown in Table 2 below.
[0073]
[Comparative Example 3]
A molded body was produced and evaluated in the same manner as in Example 2 except that the content of wollastonite (manufactured by Kinseimatic Co., Ltd., product number: SH600) was 5 parts by weight. The results are shown in Table 2 below.
[0074]
[Comparative Example 4]
A molded body was produced and evaluated in the same manner as in Example 2 except that the content of wollastonite (manufactured by Kinseimatic Co., Ltd., product number: SH600) was 5 parts by weight. The results are shown in Table 2 below.
[0075]
[Table 1]

[0076]
[Table 2]

[0077]
【The invention's effect】
In the plastic building material according to the present invention, 100 parts by weight of vinyl chloride resin obtained by graft copolymerization of vinyl monomer having vinyl chloride as a main component with 4 to 30% by weight of elastomer component is acicular or Since it consists of a composition containing 20 to 60 parts by weight of a plate-like inorganic material, it has sufficient impact resistance and mechanical strength. Further, since the linear expansion coefficient is low, deformation and breakage due to temperature change are unlikely to occur.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a molding apparatus used to obtain molded bodies in Examples and Comparative Examples.
2 (a) and (b) are cross-sectional views of a rain gutter as a molded body obtained in Example 1 and Example 7, respectively.
[Explanation of symbols]
7 ... Molded body
7A ... Molded body

Claims (4)

100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 600 to 1500 obtained by graft polymerization of 70 to 96% by weight of a vinyl monomer having vinyl chloride as a main component on 4 to 30% by weight of an elastomer component, and a laser type A resin composition including 20-60 parts by weight of an acicular inorganic material made of wollastonite having an average particle diameter of 2 to 50 μm and an aspect ratio of 5 or more measured by a particle size distribution meter is extruded using an extruder. A plastic gutter characterized by. The elastomer component is composed of 100 parts by weight of a radically polymerizable monomer mainly composed of at least one (meth) acrylate having a homopolymer glass transition temperature of −140 ° C. or higher and lower than 0 ° C .; The plastic gutter according to claim 1, which is an acrylic copolymer containing 1 to 10 parts by weight. The elastomer is composed of 100 parts by weight of (meth) acrylate having a homopolymer glass transition temperature of −140 ° C. or higher and lower than −60 ° C. and 0.1 to 1 part by weight of a polyfunctional monomer to form a core layer. In order to form a shell layer with respect to 40 to 90% by weight of the copolymer, a radically polymerizable monomer 100 mainly composed of (meth) acrylate whose homopolymer has a glass transition temperature of −60 ° C. or higher and lower than 0 ° C. 2. The elastomer having a core-shell structure, which is obtained by graft copolymerization of 10 to 60% by weight of a mixed monomer composed of 1.5 parts by weight and 1.5 parts by weight of a polyfunctional monomer. Plastic gutters . 4. The plastic rain gutter according to claim 1 , wherein a high weather resistance resin layer is formed on the surface layer by coextrusion .

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