JPH0635571B2 - Adhesive composition for car backpacking - Google Patents

Description

Detailed Description of the Invention a. OBJECT OF THE INVENTION [Industrial field of application] The present invention provides an adhesive composition used in the production of carpets such as tufted carpets and artificial turf.

[Conventional technology]

Traditionally, widely manufactured tufted carpets,
An adhesive composition containing a synthetic rubber latex as a main component is mainly used to prevent the pile (braided yarn) from falling off.

The adhesive composition also plays a role of adhering the backing material, preventing fraying, and imparting favorable feeling and dimensional stability.

In addition, the latex adhesive composition, compared to solvent-based adhesives, has no fire hazard during carpet processing, high solids adhesive composition can be obtained, no pollution by organic solvent, There are various practical advantages such as proper penetration of the adhesive composition.

However, the latex adhesive has a problem in that it needs to evaporate water having a large latent heat, which consumes a large amount of energy.

On the other hand, in the carpet manufacturing process, in order to improve productivity, a large dryer is used to perform drying at a high temperature. As described above, when high-temperature drying is carried out, boiling occurs inside the adhesive composition, and the adhesive film partially blows out on the back surface of the carpet, which may significantly impair the commercial value of the carpet.

This phenomenon is called a blister and is a major obstacle to improving productivity in the carpet manufacturing process using a latex adhesive.

In addition, ordinary carpets are often used indoors, but there are also carpets that are used outdoors such as artificial grass. In addition, carpets used outdoors require a high degree of water resistance. However, some carpets used indoors are also washed or cleaned, and improvement in water resistance is desired.

As a method for suppressing blisters in the carpet manufacturing process, in the prior art, Japanese Patent Publication No. 47754 /
Japanese Patent No. 1099716 and Japanese Examined Patent Publication No. 5644191
In the publication, a method for improving the air permeability of the adhesive film by selecting the particle size and the addition amount of the filler contained in the adhesive composition, and adding a heat sensitive agent in advance to the adhesive during drying. A method has been proposed in which the occurrence of blisters is suppressed by rapidly solidifying the adhesive.

Further, as a method of improving the water resistance of the latex adhesive, a method such as reducing the water-soluble substance contained in the adhesive, especially a surfactant as much as possible, and using a crosslinking agent is performed. There is.

[Problems to be Solved by the Present Invention]

As described in the section of the prior art, there are a method using a filler and a method using a heat sensitive agent for preventing blisters.

The method using a filler is effective in the case of an adhesive having a large amount of filler, but when high adhesive strength and excellent water resistance are required, the amount of the filler must be reduced and sufficient resistance is required. It becomes difficult to obtain the blister property.

Even in the method using a heat sensitive agent, not only the adhesive composition becomes unstable to heat, but also the stirring stability during the preparation of the adhesive composition, the mechanical stability of the adhesive composition, and the viscosity stability during storage. There is a drawback that it deteriorates the sex. An emulsifier is used in combination for this improvement. Generally, a nonionic surfactant having a cloud point is used together so as not to impair the heat sensitivity.

The aforementioned Japanese Patent Publication No. 59-47754 and Japanese Patent No. 109971.
The techniques of No. 6 and Japanese Patent Publication No. 56-44191 also use nonionic surfactants to solve this problem.

However, the use of such a nonionic surfactant is
There is a fundamental problem of reducing the water resistance of the adhesive composition, and it is difficult to satisfy both the blister resistance and the water resistance at the same time, and therefore, improvement has been desired.

In view of the above problems, the present inventors have completed the present invention as a result of repeated research aiming at development of an adhesive composition for carpet which is excellent in water resistance, particularly in water resistance, and has less blisters.

B. Structure of the Invention [Structure of the Invention] The invention comprises 35 to 80% by weight of an aliphatic conjugated diene monomer and 0.5 to 4.0% by weight of an ethylenically unsaturated carboxylic acid.
And their copolymerizable mono-olefin monomers 1
In the presence of a copolymer obtained by emulsion polymerization of 6.0 to 64.5% by weight, 0 to 20% by weight of an aliphatic conjugated diene monomer and 80 to 100% by weight of a monoolefin monomer are added. Adhesive composition for carpet backing, characterized by containing 0.01 to 3 parts by weight of organopolysiloxane and 0 to 600 parts by weight of filler with respect to 100 parts by weight (solid content) of the polymerized copolymer latex. It is to provide things. The present invention will be described in more detail below.

Among the monomers to be initially copolymerized, the aliphatic conjugated diene-based monomer is used in an amount of 35 to 80% by weight, but if it is less than 35% by weight, the resulting copolymer has a high second-order transition temperature and is used in carpets. When used, it does not give a suitable texture. Also,
If it exceeds 80% by weight, the adhesive strength will decrease.

Examples of the aliphatic conjugated diene-based monomer used in the present invention include 1,3-butadiene, isoprene, 2-chloro-1,
3-butadiene etc. are mentioned. The ethylenically unsaturated carboxylic acid used in the present invention is used in an amount of 0.5 to 4.0% by weight, but if it is less than 0.5% by weight, the adhesive strength decreases and the mechanical strength of the adhesive composition is reduced. Stability is also reduced. Further, if it exceeds 4.0% by weight, not only the blister resistance of the adhesive composition is deteriorated but also the water resistance is deteriorated. Examples of the ethylenically unsaturated carboxylic acid used in the present invention include maleic acid, fumaric acid, itaconic acid, acrylic acid and methacrylic acid. Further, of these, one kind or two or more kinds can be used in combination.

Examples of the monoolefin-based monomer used in the present invention include styrene, α-methylstyrene, acrylonitrile, methyl methacrylate, β-hydroxyethyl acrylate and the like. These mono-olefin monomers can be used alone or in combination of two or more, and styrene is particularly preferable.

The amount of the monomer to be initially copolymerized in the present invention is preferably 60 to 90% by weight based on the total amount of the monomers in terms of the feel and adhesive strength of the resulting carpet at low temperature.

Then, the aliphatic conjugated diene-based monomer is used in an amount of 0 to 20% by weight among the monomers copolymerized in the latter stage.
If the content exceeds 50% by weight, the adhesive strength will decrease. The method of adding the monomer may be any of continuous, divided, and batch addition methods and is not particularly limited.

Further, the polymerization conversion rate of the monomer to be copolymerized in the initial stage is 70
It is preferable to add a monomer to be copolymerized at a later stage when the amount is at least wt%.

The organopolysiloxane used in the present invention is described in JP-B-40-21427, JP-B-47-19064, US Pat. Nos. 3,246,339, 325514 and British Patent No. 1141867. Can be illustrated.

The organopolysiloxane used in the present invention is 0.01
It is used in an amount of up to 3 parts by weight, but if it is less than 0.01 parts by weight, the effect of preventing blisters is insufficient, and if it exceeds 3 parts by weight, the viscosity change of the adhesive composition during storage becomes large,
There are practical problems.

Examples of the filler used in the present invention include calcium carbonate, aluminum hydroxide, silica, clay and the like, and these can be used alone or in combination of two or more.

The filler used in the present invention is used in an amount of 600 parts by weight or less per 100 parts by weight of the solid content of the copolymer latex. When the amount of the filler exceeds 600 parts by weight, the adhesive strength and water resistance of the resulting carpet are deteriorated, which is not preferable. The amount of the filler is 100 in terms of the adhesive strength and water resistance of the carpet.
More preferably, the amount is 400 parts by weight.

In the adhesive composition of the present invention, generally added antioxidants, dispersants, defoamers, thickeners, colorants, crosslinking agents, crosslinking aids and the like can be used.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples.

All parts and% used in the examples mean parts by weight and% by weight unless otherwise specified.

〔Example〕

Example-1 (1) Polymerization of copolymer latex In a pressure vessel equipped with a stirrer, the initial monomers shown in Table-1, sodium alkylbenzenesulfonate 1.0 part,
Sodium hydrogen carbonate 0.6 part, potassium persulfate 0.8
Part, tert. -0.5 parts dodecyl mercaptan, 100 water
Parts and 0.05 parts of sodium ethylenediaminetetraacetate were charged and polymerized at 70 ° C. until the polymerization conversion rate exceeded 80%.

Then, the monomers to be copolymerized at the latter stage shown in Table 1 are added and polymerized at 70 ° C. to obtain copolymer latexes 1 to 3.
Got

In the same manner, as a comparative example, polymerization was performed using the initial and late monomers shown in Table 1 to obtain copolymer latexes 4 and 5
Got

The polymerization conversion rate of these copolymer latexes is 9 in each case.
It was 7% or more. Unreacted monomer is removed by steam distillation under reduced pressure, and then P is washed with an aqueous solution of sodium hydroxide.
The H was adjusted to 8.0 to 8.5.

(2) Preparation of adhesive composition Using the copolymer latex obtained in (1), adhesive compositions A to D and E to J having a total solid content of 80% and a viscosity of 20,000 centipoise were prepared according to the following formulation. Created.

Formulation (solid content, parts) Copolymer latex 100 Potassium tetrapyrophosphate 1 Phenolic antioxidant 0.5 Thickening agents necessary amount water necessary amount (3) viewed 1 m ² per a back surface of the tufted carpet create the base fabric of polypropylene split yarn and the resulting adhesive composition (2), the pile tufted carpet greige nylon A hanging weight of 1100 g was evenly applied, and a polypropylene woven fabric was attached.

A tufted carpet was prepared by drying in an oven at 130 ° C for 15 minutes.

(4) Measurement of physical properties (a) Stability of viscosity of adhesive composition during storage (2) The adhesive composition obtained in (2) was left at 40 ° C for 14 days, then allowed to cool to 25 ° C and the viscosity was measured. did. (B-type viscometer, No. 4 rotor used, rotation speed 12 rpm) (b) Marron mechanical stability of the adhesive composition According to JISK-6392, the adhesive composition obtained in (2) was observed. Hanging weight 50g, load 10kg, rotation speed 1000r
Stirred at pm for 10 minutes. Then, after passing through a 100-mesh wire net, washing with water, drying and cooling, the weight of aggregates generated was expressed in%.

(c) The adhesive composition obtained in the blister property (2) is made of polypropylene
A tufted carpet made of nylon with split yarns and piles was evenly applied on the back side of a greige machine at an apparent weight of 1500 g / m ² , and a lining material of polypropylene woven cloth was stuck on this to obtain an undried carpet.

The undried carpet was dried for 3 minutes in a dryer at a temperature of 170 ° C. and a hot air speed of 20 m / sec, and the generated blister was visually observed and judged according to the following grades.

Grade 1: No blister is observed.

Grade 8: Many blisters occur on the entire surface.

(d) Peeling strength of backing material and pull-out strength of pile yarn The carpet obtained in (3) was measured for peeling strength of the backing material and pull-out strength of pile yarn according to JIS L-1021 "Rug Test Method". did.

(e) Water resistance The carpet obtained in (3) was immersed in warm water at 60 ° C. for 120 minutes and then gently dehydrated, and the peel strength of the backing material was measured in the same manner as in (d).

The results of (a) to (e) are shown in Table-2.

Example-2 (1) Preparation of adhesive composition for artificial turf Copolymer latex 2 and 4 polymerized in Example-1
According to the following formulation, total solid content 70%, viscosity 10000
Centipoise artificial turf adhesive compositions KR were prepared.

Formulation (solid content, parts) Copolymer latex 100 Potassium tetrapyrophosphate 0.5 Phenolic antioxidant 0.8 Sulfur yellow 1.0 Succinol BZ 1.0 〃 MZ 1.0 Thickener Required amount Water required (2) Synthetic turf The adhesive composition obtained in (1) was applied to an artificial lawn machine with a polypropylene split yarn as the base cloth and polypropylene as the pile per 1 m ² Apply 600 g of weight evenly,
It was dried in an oven at 120 ° C. for 20 minutes to prepare artificial grass.

(3) Measurement of physical properties of adhesive composition (a) Viscosity stability during storage It was measured in the same manner as in Example-1.

(b) Marron Mechanical Stability It was measured in the same manner as in Example-1.

(c) The adhesive composition obtained in blister properties (1) was applied uniformly on the back surface of an artificial grass machine with polypropylene split yarn as the base cloth and polypropylene as the pile, and an apparent weight of 1000 g per 1 m ² was applied to the undried artificial surface. I made grass.

This undried artificial turf was dried for 3 minutes in a dryer at a temperature of 170 ° C. and a hot air speed of 20 m / sec, and the generated blister was observed with the naked eye and judged according to the following grades.

Grade 1: No blister is observed.

Grade 8: Many blisters occur on the entire surface.

(d) Pull-out strength of pile yarn The artificial grass obtained in (2) was measured for pull-out strength of pile yarn according to JIS L-1021.

(e) Water resistance strength The artificial turf obtained in (2) was immersed in warm water at 60 ° C for 120 minutes and then gently dehydrated, and the pull-out strength of the pile yarn was measured as in (d).

The results of (a) to (e) are shown in Table-3.

C. EFFECTS OF THE INVENTION [Effects of the Invention] An adhesive composition for carpet backing comprising the specific copolymer latex obtained in the present invention, an organopolysiloxane and a filler has sufficient viscosity stability and good mechanical properties. It has excellent stability and blister properties, and also has excellent water resistance and adhesive strength.

Claims (2)

[Claims] 1. Aliphatic conjugated diene monomer 35 to 80% by weight, ethylenically unsaturated carboxylic acid 0.5 to 4.0% by weight
And a mono-olefinic monomer 1 copolymerizable therewith
In the presence of a copolymer obtained by emulsion polymerization of 6.0 to 64.5% by weight, 0 to 20% by weight of an aliphatic conjugated diene monomer and 80 to 100% by weight of a monoolefin monomer are added. Adhesive composition for carpet backing, characterized by containing 0.01 to 3 parts by weight of organopolysiloxane and 0 to 600 parts by weight of filler with respect to 100 parts by weight (solid content) of the polymerized copolymer latex. object. 2. The initial monomers to be copolymerized are all 6 monomers.
The carpet backing adhesive composition according to claim 1, which is 0 to 90% by weight.