JP5711415B1 - Adhesive composition - Google Patents

Abstract

[PROBLEMS] To produce textiles such as carpets and artificial turf that have excellent compounding properties when preparing an adhesive composition and are lined with a backing to prevent the pile yarns planted on the base fabric from falling off. When used as a backing material, the present invention provides an adhesive composition that is particularly excellent in yarn removal strength and water resistance. An adhesive comprising 5 to 100 parts by weight (converted to solid content) of a synthetic rubber latex with respect to 100 parts by weight of a polyolefin powder, and the center particle diameter of the polyolefin powder is 150 μm or less. The agent composition is used as a backing material in producing a textile product. [Selection figure] None

Description

  The present invention relates to an adhesive composition. Specifically, when manufacturing textile products such as carpets and artificial turf that have excellent compounding properties when preparing an adhesive composition and have a backing that prevents the pile yarns planted on the base fabric from falling off. When used as a backing material, the present invention relates to an adhesive composition that is particularly excellent in yarn removal strength and water resistance.

In many textile products, a synthetic rubber latex adhesive composition is used as a backing material to fix the pile yarn. This adhesive composition uses a water-based adhesive composition in which an inorganic filler such as calcium carbonate is blended with a diene copolymer latex or an acrylic copolymer emulsion as a synthetic rubber latex. It is well known.

  In recent years, the length of pile yarns is sometimes increased in carpets to enhance the softness. In addition, long artificial piles with long pile yarns are often used as artificial turf for providing sporting properties such as baseball stadiums and soccer fields with excellent cushioning properties similar to natural turf. In the composition, there is a problem that the pile yarn usually tends to come off as the length of the pile yarn increases. In addition, there is a problem that the pile falls due to the long pile yarns entangled and the soft feeling is lowered. Therefore, in order to suppress the entanglement of the pile yarn, the twist between the pile yarns may be reduced, and there is a problem that the pile yarn is more likely to come off.

Moreover, split yarn yarns are the mainstream for artificial turf piles, but for sports events, wear resistance and pile collapse resistance are good, the coefficient of friction is low, and the frictional heat when slipping in is low. For this reason, piles made of non-crimped monofilament yarns have come to be used in many cases, but monofilament yarns do not have a honeycomb structure like split yarns. In addition, since the yarn is relatively thin and the bonding area with the adhesive composition is small, there is a problem that the pile yarn is likely to come off as in the case of the long pile. Further, when used outdoors, there is a demand for excellent wet pull strength (water resistance) of pile yarn.

Therefore, in order to make it difficult for the pile yarn to come off, an example in which a filler is added to a liquid mixture obtained by mixing a synthetic rubber latex and an olefin resin emulsion is used as an adhesive composition for backing (see Patent Document 1) or an emulsion. An example of a composition for artificial turf carpet backing material containing an epoxy resin (see Patent Document 2) and an ethylene acrylate copolymer emulsion in the emulsion and using blocked isocyanate as a crosslinking agent (see Patent Document 3) ), But the pile yarn (especially made of monofilament yarn) is difficult to come off and the pile yarn pull-out strength (pull-out strength) and wet pile yarn pull-out strength (water resistance) are not sufficient. .
In addition, there is an example of artificial turf using an adhesive composition in which diphenylmethane diisocyanate is blended with a self-crosslinking carboxy-modified styrene-butadiene copolymer (see Patent Document 4), but it is necessary to obtain sufficient strength. When an appropriate amount of diphenylmethane diisocyanate is added, there is a problem that the texture becomes hard and the workability is deteriorated, the usable time is limited, and the cost is increased.

JP 2008-150844 A

JP 2007-269836 A

JP 2008-088414 A

JP 2012-193528 A

An object of the present invention is to provide an adhesive composition with good adhesiveness in an aqueous dispersion characterized by containing a polyolefin-based powder and a synthetic rubber latex in order to solve the current problems in view of the above-mentioned circumstances. It is for the purpose.

  The present invention is an aqueous dispersion adhesive composition characterized by containing polyolefin powder having a specific center average particle size and a synthetic rubber latex in a specific ratio, at the time of preparing the adhesive composition Disclosed is an adhesive composition that is excellent in compounding properties and has a good balance of yarn removal strength and water resistance in processed products such as carpet products and artificial turf products obtained by using the composition as a backing material.

  Furthermore, the adhesive composition which is further excellent in the effect mentioned above is provided by using specific synthetic rubber latex or specific polyolefin-type powder.

  Since the adhesive composition of the present invention is excellent in the compounding property at the time of preparing the adhesive composition, it is excellent in the spreadability of the colorant when the colorant is used, and is a carpet using the composition as a backing material. When processing products, artificial turf products, etc., it has an excellent balance of yarn removal strength and water resistance. These effects are particularly remarkable when used as a backing material for artificial turf products.

The present invention is described in detail below.
Examples of the polyolefin powder in the present invention include polypropylene powder and polyethylene powder, and one or more of these can be used. Among these, polyethylene powder is preferable.
The center particle size of the polyolefin-based powder needs to be 150 μm or less. When it exceeds 150 μm, the appearance after application is deteriorated. Moreover, it is more preferable that it is 100 micrometers or less from a viewpoint of the external appearance after application | coating, a pulling-out strength, and water resistance.
The MFR (melt mass flow rate) measured by the method (Condition D) described in JIS K6992-1 for polyolefin powder is preferably 30 g / 10 min or more and 150 g / 10 min or less. More preferably, they are 50 g / 10min or more and 120 g / 10min or less. If the MFR is too low, the state of coating of the olefin on the pile is poor, and the yarn removal strength and water resistance are reduced.

  Examples of the synthetic rubber latex in the present invention include a butadiene / styrene copolymer latex, a butadiene / acrylonitrile copolymer latex, a butadiene / methyl methacrylate copolymer latex, and a butadiene / styrene / vinylpyridine copolymer latex. And diene copolymer latex, polychloroprene latex, polyisoprene latex and the like, and one or more of these can be used. Of these, diene copolymer latex is preferable, and carboxy-modified diene copolymer latex is more preferable.

  As the monomer constituting the diene copolymer latex, a conjugated diene monomer and a monomer copolymerizable with the conjugated diene monomer can be used. Examples of the copolymerizable monomer include known monomers such as aromatic vinyl monomers, ethylenically unsaturated carboxylic acid ester monomers, and vinyl cyanide monomers. There are no particular restrictions on the type and amount of use of these monomers as long as they do not hinder the performance of the resulting adhesive composition, but when 100 parts by weight of the monomer constituting the diene copolymer latex is used. The conjugated diene monomer is 20 to 60 parts by weight, more preferably 30 to 50 parts by weight, and the monomer copolymerizable with the conjugated diene monomer is 40 to 80 parts by weight, more preferably 50 to 50 parts by weight. A range of 70 parts by weight is preferable from the viewpoint of adhesive strength and texture.

  In order to obtain a carboxy-modified diene copolymer latex, an ethylenically unsaturated carboxylic acid monomer is further used as the monomer constituting the diene copolymer latex described above. Examples of the ethylenically unsaturated carboxylic acid monomer include acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid. When 100 parts by weight of the monomer constituting the carboxy-modified diene copolymer latex is used, the conjugated diene monomer is 20 to 60 parts by weight, and the ethylenically unsaturated carboxylic acid monomer is 0.8. It is preferable that the amount of the monomer copolymerizable with 3 to 2 parts by weight is 38 to 79.7 parts by weight. Furthermore, 30 to 50 parts by weight of a conjugated diene monomer, 0.5 to 1.5 parts by weight of an ethylenically unsaturated carboxylic acid monomer, and 48.5 to a monomer copolymerizable therewith. More preferably, it is in the range of 69.5 parts by weight. When the amount of the ethylenically unsaturated carboxylic acid monomer is less than 0.3 parts by weight, the compounding property of the adhesive composition and the take-off strength of the processed product tend to decrease, and when the amount exceeds 2 parts by weight, the water resistance decreases. There is a tendency and is not preferred.

  The glass transition point of these synthetic rubber latices is preferably in the range of −40 to 20 ° C., more preferably in the range of −30 to 10 ° C., and below −40 ° C., the take-off strength of the processed product If the temperature exceeds 20 ° C., the texture becomes hard and the workability tends to be inferior. The glass transition point of the obtained copolymer can be appropriately adjusted by a known monomer composition or a known method of adding a monomer to the polymerization system.

The synthetic rubber latex used in the adhesive composition of the present invention can be obtained by emulsion polymerization of each monomer. The addition method of various components in emulsion polymerization is not particularly limited, and any of a batch addition method, a divided addition method, a continuous addition method, and a power feed method can be employed. As the polymerization method, batch polymerization, semi-batch polymerization, seed polymerization and the like can be used.
Furthermore, in the case of emulsion polymerization, conventional emulsifiers, chain transfer agents, polymerization initiators, hydrocarbon solvents, electrolytes, polymerization accelerators, chelating agents and the like can be used.

  As emulsifiers used for emulsion polymerization of synthetic rubber latex, higher alcohol sulfates, alkylbenzene sulfonates, alkyl diphenyl ether disulfonates, aliphatic sulfonates, aliphatic carboxylates, aliphatic sulfate esters Anionic surfactant such as polyoxyethylene alkyl ether, polyoxyethylene alkylene alkyl ether, nonionic surfactant such as polyoxyethylene derivative, and one or more amphoteric surfactants such as betaine type Can be used in combination.

  Examples of the chain transfer agent used in the polymerization of the synthetic rubber latex include n-hexyl mercaptan, n-octyl mercaptan, t-octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, alkyl mercaptan such as n-stearyl mercaptan, and dimethylxanthogen. Xanthogen compounds such as disulfide, diisopropylxanthogen disulfide, terpinolene, thiuram compounds such as tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetramethylthiuram monosulfide, α-methylstyrene dimer, 2,6-di-t-butyl -4-Methylphenol, phenolic compounds such as styrenated phenol, allyl compounds such as allyl alcohol, dichloromethane, dibromomethane, four odors Halogenated hydrocarbon compounds such as carbon, vinyl ethers such as α-benzyloxystyrene, α-benzyloxyacrylonitrile, α-benzyloxyacrylamide, triphenylethane, pentaphenylethane, acrolein, methacrolein, thioglycolic acid, thiomalic acid, 2-ethylhexyl thioglycolate etc. are mentioned, These can be used 1 type, or 2 or more types.

  As a polymerization initiator used in the polymerization of the synthetic rubber latex, water-soluble polymerization initiators such as potassium persulfate, sodium persulfate, and ammonium persulfate, redox polymerization initiators, and oil-soluble polymerization initiators such as benzoyl peroxide are appropriately used. Can be used. In particular, the use of a water-soluble polymerization initiator is preferred.

  Also, during the polymerization of synthetic rubber latex, saturated hydrocarbons such as pentane, hexane, heptane, octane, cyclohexane, cycloheptane, pentene, hexene, heptene, cyclopentene, cyclohexene, cycloheptene, 4-methylcyclohexene, 1-methylcyclohexene, etc. Hydrocarbon solvents such as unsaturated hydrocarbons, aromatic hydrocarbons such as benzene, toluene and xylene may be used.

The adhesive composition of the present invention needs to contain 5 to 100 parts by weight (in terms of solid content) of synthetic rubber latex with respect to 100 parts by weight of polyolefin-based powder. When the amount is less than 5 parts by weight, the compounding property at the time of compounding the adhesive composition is lowered, and the spreading property of the pigment when the coloring pigment is added to the adhesive composition is inferior. When the amount exceeds 100 parts by weight, the yarn removal strength and water resistance when processed into a carpet product or an artificial turf product are inferior.
The higher the use ratio of the synthetic rubber latex, the lower the pull-out strength and water resistance, but the compounding property at the time of compounding the adhesive composition is improved, and the flowability is improved and the coating appearance tends to be better and coloring. When the agent is used, the spreadability of the colorant tends to be good.

  In the adhesive composition of the present invention, an emulsifier, a dispersant and the like can also be blended in order to adjust the dispersion state when the polyolefin powder is blended. There are no particular limitations on the type and amount used, and appropriate amounts can be used as long as the performance of the adhesive is not impaired.

  In the adhesive composition of the present invention, one or two inorganic fillers such as calcium carbonate, clay, aluminum hydroxide, magnesium hydroxide, titanium oxide, barium sulfate, zinc oxide, and satin white are used as the filler. More than seeds can be used. The amount of the filler used is preferably 300 parts by weight or less with respect to 100 parts by weight of the polyolefin-based powder. When the amount exceeds 300 parts by weight, the take-off strength and water resistance tend to decrease.

  In the adhesive composition of the present invention, as other additives, anti-aging agents, ultraviolet absorbers, flame retardants, antiseptics, antibacterial agents, deodorants, pH adjusters, thickeners, penetrants, foaming agents It is also possible to add known additives such as antifoaming agents, color pigments, and fragrances. Moreover, you may use together polyorganosiloxane, starch, etc. which have the function of blister prevention. There are no particular limitations on the type and amount used, and appropriate amounts can be used as long as the performance as an adhesive is not impaired.

  The method for applying the adhesive composition of the present invention is not particularly limited, and examples thereof include a roll coating method, a foamed direct coating method, and a spray method. About the drying after application | coating, although the method of heat-processing and drying is preferable, 80-160 degreeC is preferable for heating temperature, More preferably, it is 100-140 degreeC.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited to these Examples, unless the summary is exceeded. In the examples, parts and percentages indicating percentages are based on weight unless otherwise specified. In addition, various physical properties in the examples were evaluated by the following methods. The evaluation results are shown in Tables 1 to 3.

Glass transition temperature About 0.5 g of synthetic rubber latex was applied to a glass plate and dried at 70C for 4 hours to form a film. The dried film is set in an aluminum pan for DSC test, the sample is homogenized again by heating, and then the measurement temperature is raised from -100 to 150 ° C at a rate of 10 ° C / min. The starting point was read and used as the glass transition temperature (° C.) of the synthetic rubber latex.

Preparation of synthetic rubber latex A to C A pressure resistant polymerization reactor was charged with 100 parts of pure water, 0.6 part of potassium persulfate, 0.1 part of sodium dodecylbenzenesulfonate, and 0.5 part of sodium alkyldiphenyl ether disulfonate. After sufficiently stirring, each monomer shown in Table 1 and 0.2 part of t-dodecyl mercaptan and 2 parts of cyclohexene were added, and polymerization was started at 70 ° C., and the final polymerization conversion rate exceeded 95%. The polymerization was terminated at that point.
Next, the obtained synthetic rubber latex was adjusted to pH 7.5 to 8.5 with ammonia, and unreacted monomers and other low-boiling compounds were removed by steam distillation to obtain synthetic rubber latex A to C.

MFR (melt mass flow rate)
About MFR (melt mass flow rate), it conformed to the method (condition D) described in JIS K6922-1.

Evaluation of pulling-out strength About the pulling-out strength of one of the monofilaments constituting the pile yarn of the artificial turf products obtained in Examples 1 to 9 and Comparative Examples 1 to 5 below, JIS L 1021-8: It was measured by a method based on 2007 (Fiber floor covering test method-Part 8: Pile yarn pull-out strength test method).

Water resistance evaluation (waterproofing strength)
The artificial turf products obtained in Examples 1 to 9 and Comparative Examples 1 to 5 below were taken out after being immersed in water at 25 ° C. for 24 hours, and after wiping off moisture with a waste cloth, the measurement was performed in the same manner as the evaluation of the yarn removal strength. did.

Colorant spreadability When the artificial turf products obtained in Examples 1 to 9 and Comparative Examples 1 to 5 below were immersed in water at 25 ° C. for 24 hours, the colorant in the adhesive composition in water. Was marked with x, and when it was not eluted was marked with ◯.

Example 1
According to the formulation shown in Table 2, 100 parts by weight of polyethylene powder having a center particle diameter of 20 μm and MFR of 75 g / 10 min, 100 parts by weight of synthetic rubber latex A (in terms of solid content), 2 parts by weight of dispersant, and permeation The composition of the present invention was prepared by blending 1 part by weight of the agent, 0.3 part by weight of the antifoaming agent, and 1 part by weight of the colorant (carbon black) and adjusting using a thickener and water. .
Using this coating composition, a coating bar is used to apply an amount of 440 g / m ² (solid content) on the back side of an uncrimped polyethylene monofilament yarn pile artificial turf that has a straight axis and is not refracted. Then, the coated surface was dried with hot air at 120 ° C. for 30 minutes to obtain an artificial turf product.

Example 2
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that synthetic rubber latex B was used instead of synthetic rubber latex A blended in Example 1.

Example 3
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that synthetic rubber latex C was used in place of the synthetic rubber latex A blended in Example 1.

Example 4
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that the MFR of the polyethylene powder blended in Example 1 was changed to 20 g / 10 min.

Example 5
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that the polyethylene powder blended in Example 1 had a center particle size of 100 μm and MFR of 50 g / 10 min.

Example 6
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that the synthetic rubber latex A blended in Example 1 was changed to 20 parts by weight (in terms of solid content).

Example 7
A composition and an artificial turf product were obtained in the same manner as in Example 6 except that 100 parts by weight of calcium carbonate was added to the formulation of Example 6.

Example 8
A composition and an artificial turf product were obtained in the same manner as in Example 6 except that 400 parts by weight of calcium carbonate was added to the formulation of Example 6.

Example 9
A composition and an artificial turf product were obtained in the same manner as in Example 7 except that the synthetic rubber latex A blended in Example 7 was changed to 10 parts by weight (in terms of solid content).

Comparative Example 1
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that the polyethylene powder blended in Example 1 was omitted.

Comparative Example 2
A composition and an artificial turf product were obtained in the same manner as in Comparative Example 1 except that 100 parts by weight of calcium carbonate was added to the formulation of Comparative Example 1.

Comparative Example 3
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that the synthetic rubber latex A blended in Example 1 was changed to 150 parts by weight (in terms of solid content).

Comparative Example 4
A composition and an artificial turf product were obtained in the same manner as in Example 1 except that the synthetic rubber latex A blended in Example 1 was omitted.

Comparative Example 5
A composition and an artificial turf product were obtained in the same manner as in Comparative Example 1 except that a commercially available polyethylene resin emulsion was used instead of the synthetic rubber latex A blended in Comparative Example 1.

  As shown in Table-2, all of the adhesive compositions shown in Examples 1 to 9, which are the invention of the present application, were excellent in the balance of the yarn removal strength, water resistance, and colorant spreadability.

  As shown in Table 3, none of Comparative Examples 1, 2, and 5 uses polyolefin-based powder, and Comparative Example 3 has a large blending amount of synthetic rubber latex, which is different from the scope of the present invention. Especially, the water resistance was inferior. Moreover, since the comparative example 4 did not mix | blend synthetic rubber latex and was different from the range of this invention, the colorant spreading property was inferior.

  As described above, by using the adhesive composition of the present invention as a binder for a backing material for carpets or artificial turf, it is possible to stably provide a processed product having excellent yarn removal strength and water resistance. Among them, it is suitable as a backing material for artificial turf products.

Claims (5)

It contains 5 to 100 parts by weight (converted to solid content) of synthetic rubber latex with respect to 100 parts by weight of the polyolefin powder, the center particle diameter of the polyolefin powder is 150 μm or less , and the condition D of JIS K6922-1 An adhesive composition characterized by having an MFR (melt mass flow rate) of 30 g / 10 min or more .   The adhesive composition according to claim 1, wherein the synthetic rubber latex is a diene copolymer latex.   The adhesive composition according to claim 2, wherein the diene copolymer latex is a carboxy-modified diene copolymer latex. Polyolefin powder, the adhesive composition according to claim 1, characterized in that a port Riechiren. Carpet or adhesive composition according to any one of claims 1 to 4, characterized in that used as the backing material in the manufacture of artificial turf.