JPS595617B2 - Composition for waterproof sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 5 The present invention relates to a composition for waterproof sheets, and more specifically, it is composed of polyvinyl chloride, an ethylene-vinyl acetate copolymer, and a specific epoxy compound, and has long-term weather resistance and heat resistance. The present invention relates to a composition for a waterproof sheet that has excellent dimensional stability and workability.

0 In recent years, waterproofing methods using sheets have been widely adopted in order to make buildings taller, lighter, and more aesthetically pleasing.

Sheet materials used for such sheet waterproofing can be broadly classified into vulcanized rubber-based materials, PVC-based materials, etc., and each has its advantages and disadvantages. For example, 5-vulcanized rubber sheets are still insufficient in terms of durability and adhesion, and PVC sheets have poor dimensional stability, durability and
Furthermore, adhesion to the base is insufficient. The inventors of the present invention have made extensive studies to eliminate these drawbacks, and have found that there is little deterioration due to heat or light over a long period of time, and this results in excellent dimensional stability and good waterproof performance. We have found a composition that can be easily adhered or applied, and can also be colored in any desired color.

That is, the present invention consists of (1) polyvinyl chloride, (2) ethylene-vinyl acetate copolymer, and (3) an epoxy compound having at least one aromatic ring in the molecule,
(1) The weight ratio of polyvinyl chloride and (2) ethylene-vinyl acetate copolymer is 85:15 to 10:90, and (2) the ethylene-vinyl acetate copolymer has ethylene Contains ~60% by weight and has a Mooney viscosity of 15-7
0, and (3) at least 1 part by weight of an epoxy compound is blended with respect to 100 parts by weight of the sum of (1) polyvinyl chloride and (2) ethylene-vinyl acetate copolymer. The present invention provides a composition for a waterproof sheet.

The vinyl chloride component in the polyvinyl chloride polymer used in the present invention is 75% by weight or more, and includes those copolymerized with other monomers.

Monomers that can be copolymerized include ethylene, propylene,
Examples include vinyl acetate and acrylic ester. The ethylene monovinyl acetate copolymer used in the present invention has an ethylene content of 20 to 60% by weight, according to JISK-
It was measured at 6300.

If the ethylene content is less than 20% by weight, such a copolymer will have poor low temperature flexibility and softness, and if the ethylene content exceeds 60% by weight, it will have poor compatibility with polyvinyl chloride resin. The preferred ethylene content of such copolymers is 30-55% by weight. The ethylene monovinyl acetate copolymer used in the present invention can be produced by conventional polymerization methods, namely solution,
It can be synthesized by suspension or bulk polymerization, but it is preferably synthesized by emulsion polymerization at a polymerization temperature of 50° C. or lower. The ethylene monovinyl acetate copolymer used in the present invention may be copolymerized with a monomer copolymerizable with the copolymer as long as the characteristics of the present invention are not impaired. Furthermore, in the present invention, the weight ratio of polyvinyl chloride and ethylene monovinyl acetate copolymer is 85:15 to 10:90.
However, if the blending ratio of polyvinyl chloride is less than 10, it will not have sufficient strength as a waterproof sheet, and if the blending ratio of polyvinyl chloride exceeds 85, it will not have sufficient weather resistance as a waterproof sheet. Unable to maintain sexuality,
Moreover, it is not preferable because it is not possible to prevent the yoking phenomenon when a filler is added.

The preferred blending ratio of polyvinyl chloride and ethylene monovinyl acetate copolymer is 20/80 to 70/30. The epoxy compound used in the present invention has at least one aromatic ring in the molecule, and is, for example, a reaction product of bisphenol such as bisphenol A or bisphenol F with epichlorohydrin or methylepichlorohydrin, or a novolak type. Examples include epoxy resins, and the epoxy equivalent thereof is preferably from 170 to 600. Among these epoxy resins, bisphenol type epoxy resins obtained from the reaction of bisphenol A or bisphenol F with epichlorohydrin or methylepichlorohydrin are preferred. Of course, halogenated epoxy resins such as chloro and bromine can also be used to impart flame retardancy. The epoxy resin used in the present invention has an aromatic ring, so it has excellent weather resistance and does not discolor.
Furthermore, it is possible to provide a waterproof sheet free from the yoking phenomenon. The amount of such epoxy resin used is at least 1 part by weight per 100 parts by weight of the sum of polyvinyl chloride and ethylene monovinyl acetate copolymer, and if this amount is less than 1 part by weight, weather resistance will not be sufficiently improved. . The amount of epoxy resin used is usually at most 15 parts by weight, and more preferably from 1 to 10 parts by weight, considering that the composition may become sticky. Other compatible polymers, plasticizers, fillers, stabilizers, anti-aging agents, weather resistance agents, colorants, flame retardants, etc. may be added to the waterproof sheet of the present invention, if necessary.

Examples of plasticizers that can be used in the present invention include phthalic acid plasticizers such as dioctyl phthalate, dibutyl phthalate, and diisodecyl phthalate.

Examples include trimellitic acid plasticizers such as trioctyl trimellitate, phosphorus plasticizers, and polyester plasticizers.

As fillers, inorganic fillers such as calcium carbonate, clay, talc, white carbon, magnesium silicate, calcium silicate, and asbestos powder, and short fibers such as polyester, propylene, cotton, glass fiber, and asbestos are used. The amount to be blended is determined depending on the required physical properties. Further, examples of the flame retardant used in the present invention include antimony trioxide, chlorinated paraffin, polybrominated bisphenol A, and derivatives thereof.

In the present invention, other compatible polymers may be added as necessary, and examples of such polymers include chlorinated polyethylene, polyurethane, and chlorosulfonated polyethylene. The waterproof sheet of the present invention may be crosslinked (reticulated) to further improve physical properties such as strength and durability. Crosslinking is carried out by using organic peroxide or by irradiation with high energy beams such as electron beams and radiation. The waterproof sheet according to the present invention is manufactured using a general rubber or plastic molding machine, and one of the steps is as follows.

That is, the ingredients are mixed uniformly using a pen shell mixer, lipon blender, etc., thoroughly kneaded using a mixing roll or a Banbury mixer, and then formed into a sheet using an extruder or calendar molding machine. Furthermore, a waterproof sheet made using the composition of the present invention may be one in which the composition of the present invention is coated or laminated on another base material. Other base materials include polyvinyl chloride sheets, foamed polyvinyl chloride sheets, polyethylene sheets or foamed polyethylene sheets, asbestos cloth, glass cloth,
Examples include woven materials such as synthetic or natural senile cloth, and combinations thereof. Examples of the lamination method include a method of laminating during calender molding, and a method of laminating sheets by bonding them together using an adhesive. Next, the features of the present invention will be explained in detail with reference to Examples.

In addition, parts in the examples mean parts by weight. Example 1 Polyvinyl chloride (100 = 1100) 70 parts Ethylene monovinyl acetate copolymer (ethylene content 35% by weight, ML,
+4 (100°C) = 35) 30 parts DOP 3 O parts Epiclon 850 (epoxide of bisphenol A, epoxy equivalent weight 184-194) 5 parts Calcium carbonate
50 parts Stabilizer 3.0 parts Titanium oxide 5.0 parts The raw material was kneaded for 5 minutes at 160°C using a Banbury mixer, and then turned into meat using an inverted L-shaped calender roll set at 160-175°C. .011! A thick tarpaulin sheet was obtained.

Its physical properties are shown in Table 1. Example 2 In the formulation of Example 1, 50 parts of polyvinyl chloride, 50 parts of ethylene monovinyl acetate copolymer, 60 parts of DOP2O, and 60 parts of calcium carbonate were used, and the other conditions were the same as in Example 1.
A thick tarpaulin sheet was obtained.

Its physical properties are shown in Table 1. Example 3 In the formulation of Example 1, 20 parts of polyvinyl chloride, 80 parts of ethylene monovinyl acetate copolymer, and 70 parts of calcium carbonate were added.
1.01 parts, DOP 5 parts, and the other parts were the same as in Example 1.
A thick tarpaulin sheet was obtained.

Its physical properties are shown in Table 1. Comparative Example 1 A waterproof sheet having a 1.0 fin thickness was obtained in the same manner as in Example 1 except that Epiclon 850 was not added to the formulation of Example 1.

Its physical properties are shown in Table 1. Comparative Example 2 The same procedure was used as in Example 1 except that 3.0 parts of epoxidized soybean oil (Eposizer 1 W-100EL; Dainippon Ink & Chemicals) was added to the formulation of Example 1 without adding Epiclon 850. A waterproof sheet with a thickness of 1.011 was obtained.

Its physical properties are shown in Table 1. Comparative Example 3 Polyvinyl chloride (i=1100) 100 parts DOP5O parts Calcium carbonate 40 parts Stabilizer
3.0 parts Titanium oxide 5.0 parts Epocizer W-100EL 360 parts of raw materials were kneaded at 160°C for 5 minutes using a Banbury mixer, and then mixed with 160-1
It was formed into a sheet using an inverted L-shaped calender roll set at 75° C. to obtain a 1.011-thick waterproof sheet.

Its physical properties are shown in Table 1. Comparative Example 4 A waterproof sheet was obtained in the same manner as in Example 1, except that an ethylene monovinyl acetate copolymer having an ethylene content of 37% by weight and a viscosity (ML1+4 (100°C)) of 7 was used.

Its physical properties are shown in Table 1. Comparative Example 5 A waterproof sheet was obtained in the same manner as in Example 1 except that the ethylene monovinyl acetate copolymer was not used and the amount of DOP was changed to 60 parts.

Its physical properties are shown in Table 1. As is clear from the above results,
The examples showed no discoloration in the heat resistance test, and even with respect to the weather resistance that is particularly required for waterproof sheets, there was no discoloration or yoking phenomenon despite a long accelerated test of 3,000 hours using the Sunshine Weather Meter. or,
While there was little change in elongation, the comparative examples showed significant yellowing and yoking phenomena, cracks appeared on the surface, and a significant decrease in elongation.

Example 4 Cheesecloth was used as the base fabric, and polyvinyl chloride (F2100) 100% was coated on top of it using a calendar molding machine.
Part DOP 50 Part Calcium carbonate 150 parts Stabilizer
A waterproof sheet was prepared by laminating 35 parts of the formulation to a thickness of 1.2 mm, and then layering the formulation shown in Example 2 to a thickness of 0.8 ml thereon.

Claims (1)

[Claims] 1 Consisting of (1) polyvinyl chloride, (2) ethylene-vinyl acetate copolymer, and (3) an epoxy compound having at least one aromatic ring in the molecule, (1) polyvinyl chloride and (2) ethylene. -The weight ratio with the vinyl acetate copolymer is 85:15 to 10:90, and (2) the ethylene-vinyl acetate copolymer contains 20 to 60% by weight of ethylene, and has a Mooney viscosity of 15 to 70. And furthermore (
3) A composition for a waterproof sheet, characterized in that an epoxy compound is blended in an amount of at least 1 part by weight based on 100 parts by weight of the sum of (1) polyvinyl chloride and (2) ethylene-vinyl acetate copolymer.