JPH026668A - Adhesive composition for carpet backing - Google Patents

Abstract

PURPOSE:To obtain the title composition simultaneously developing excellent thermoformability, form retentivity and fiber adhesive force, processable in one step by mixing tow copolymer latex components of each specific composition in specified ratio. CONSTITUTION:An adhesive composition prepared by mixing (A) 30-70 pts.wt., on a solid basis, of a copolymer latex from 3-70wt.% of a maleimide monomer (pref. N-phenylmaleimide) 30-90wt.% of an aromatic vinyl monomer (pref. styrene) and 0-67wt.% of another monomer copolymerizable therewith and (B) 70-30 pts.wt., on a slid basis, of a second copolymer latex from 10-90wt.% of butadiene, 10-90wt.% of styrene and 0-80wt.% of another monomer copolymerizable therewith (e.g., acrylic acid) is applied on a needle-punched carpet consisting of polyester or polypropylene, and the resultant coated product is heated and formed using a forming machine, thus easily obtaining an automobile carpet in one step processing in high productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive composition for backing carpets used as interior materials for automobiles.

[Conventional technology]

It is molded using press molding to match the shape of the car's floor, and then installed into the car.

On the other hand, unlike the above-mentioned two-stage processing method, a so-called one-stage processing method is disclosed in JP-A-58-52776, in which a carpet that can be continuously molded is obtained by applying an aqueous plastic dispersion to the back surface of the carpet. ing.

[Problem that the invention seeks to solve]

In the conventional two-step processing method, nonwoven fibers or pile yarns are fixed by coating or impregnating with an adhesive consisting of a styrene-butadiene copolymer latex or a water-based emulsion of a resin, and then a thermoplastic resin film is applied. However, such a two-step processing method complicates the carpet manufacturing process, and therefore improvements have been desired.

On the other hand, the above-mentioned one-step processing method that imparts thermoformability to the adhesive without backing with a thermoplastic resin film has the ability to maintain thermoformability and its shape (called shape retention). ) is insufficient, and if an attempt is made to improve this thermoformability and shape retention, there is a problem in that the adhesion of the fibers decreases.

Therefore, it has been desired to develop a backing adhesive composition that is excellent in all aspects of thermoformability, shape retention, and fiber adhesion and that can be processed in one step.

[Means for solving problems]

In order to solve these problems, the present inventors conducted intensive research on an adhesive composition for car vent lining that can be processed in one step, and found that
Rather than using a known aqueous plastic dispersion and a mixture of the dispersion as a backing adhesive as proposed in No. 6, a copolymer latex consisting of a specific composition and a mixture of The present invention was completed based on the discovery that when the resulting mixture is used as a backing adhesive, it exhibits excellent effects in all aspects of thermoformability, shape retention, and fiber adhesion. It's arrived.

That is, the present invention is composed of 3 to 70% by weight of a maleimide monomer, 30 to 97% by weight of an aromatic vinyl monomer, and 0 to 67% by weight of another monomer copolymerizable with these monomers. Copolymer latex formula: 30-0 parts by weight (solid content weight equivalent), 10-90% by weight of butadiene, 1 part by weight of styrene
Copolymer latex composed of 0 to 90% by weight and 0 to 80% by weight of other monomers copolymerizable with these (70 to 30 parts by weight (solid content equivalent) as the main component) The present invention provides an adhesive composition for use in carpet backing.

By applying or impregnating the adhesive composition of the present invention on the back side of a needle-punched carpet or tufted carpet, an automobile carpet with excellent thermoformability and shape retention, and excellent fiber adhesion strength can be obtained. can be obtained easily. Furthermore, unlike the two-stage processing method described above, the present invention does not require backing with a thermoplastic resin film, and is therefore excellent in simplifying the carpet manufacturing process and improving productivity.

The present invention will be explained in more detail below.

0 copolymer latex■ The copolymer latex formula used in the present invention contains 3 to 70% by weight of maleimide monomer, 3% by weight of aromatic vinyl monomer.
It is composed of 0 to 97% by weight and 0 to 67% by weight of other monomers copolymerizable with these.

Maleimide monomer content is less than 3% by weight or 70% by weight
If it exceeds , the shape retention will be poor. Aromatic vinyl monomer is 30
If it is less than 97% by weight or more than 97% by weight, shape retention will be poor.

Maleimide monomers include maleimide, N-methylmaleimide, N-ethylmaleimide, N-isopropylmaleimide, N-methylmaleimide, N-hexylmaleimide, N-octylmaleimide, N-laurylmaleimide, N-cyclohexyl Examples include maleimide and N-phenylmaleimide, and one or more types can be used. Particularly preferred is N-phenylmaleimide.

Examples of the aromatic vinyl monomer include styrene, α-methylstyrene, chlorostyrene, dichlorostyrene, bromostyrene, dipromostyrene, etc.
More than one species can be used. Particularly preferred are styrene and α-methylstyrene.

Other monomers that can be copolymerized include acrylic acid, methacrylic acid, itaconic acid, fumaric acid, methyl methacrylate, β-hydroxymethyl methacrylate, acrylonitrile, acrylamide, etc., and one or more of them may be used. be able to. The particle size of the copolymer latex is preferably 5Q-3 (1Q nm, more preferably 50 to 150 nm).

0 copolymer latex) The copolymer latex (B) used in the present invention contains 10 to 90 M% of butadiene and 10 to 90 M% of styrene.
and other monomers copolymerizable with these 0 to 80% by weight
It consists of

If the butadiene content is less than 10% by weight, the adhesion of the fiber will be poor;
If it exceeds 90% by weight, moldability will be poor. Styrene is 10
If it is less than 90% by weight, the moldability will be poor, and if it exceeds 90% by weight, the adhesion of the fibers will be poor.

Other copolymerizable monomers include acrylic acid, methacrylic acid, fumaric acid, itaconic acid, methyl methacrylate, butyl acrylate, acrylonitrile, acrylamide, β-hydroxyethyl acrylate, α-methylstyrene, and the like.

The particle size of the copolymer latex (13) is 50 to 3o.

It is preferably nm, and more preferably 50 to 1501 m.

0 latex mixture The latex mixture used in the present invention consists of copolymer latex formula 30 to 0 parts by weight (solid content weight equivalent) and copolymer latex (13) 70 to 30 parts by weight (solid content weight equivalent). ).

If 8 is less than 30% by weight, moldability and shape retention will be poor, and 70%
If the amount exceeds the weight part, the fixing strength of the m-fibers will be poor.

(If the average weight exceeds 70 parts by weight, moldability and shape retention will be poor;
If the amount is less than 0 parts by weight, the adhesion of the fibers will be poor.

Copolymer latexes (1) and (0) of the present invention are produced by known methods. That is, a batch addition method, a divided addition method, a continuous addition method, a two-stage polymerization method, a power feed method, etc. can be applied.

The adhesive composition of the present invention can appropriately contain an antioxidant, a filler, a flame retardant, a thickener, a surfactant, a crosslinking agent, and the like.

Carpets to which the adhesive composition of the present invention can be applied include needle punch carpets and tufted carpets using fibers such as polypropylene, polyester, nylon, acrylic, wool, etc., and automotive carpets that require a heat molding process. Applies to carpets and upholstery.

As a method for applying or impregnating the adhesive composition of the present invention, the adhesive may be foamed or thickened, and processing methods include rick roll, squeezing roll, spraying with a gun, dipping, etc. . Further, in order to completely impregnate the carpet, it is preferable to squeeze the applied adhesive composition using a squeezing roll. After applying or impregnating the adhesive composition, moisture is removed by heating to obtain a moldable carpet.

Examples of the method for molding the carpet include heating the carpet and molding it using a pressure roll or a press molding machine.

Carpets and interior materials for automobiles obtained using the adhesive composition of the present invention can be further lined with a thermoplastic resin film such as polyethylene by thermal fusion, if necessary.

EXAMPLES The present invention will be specifically explained with reference to Examples below.
The present invention is not limited in any way by these Examples. Note that all parts and % in the examples mean parts by weight and % by weight unless otherwise specified.

<Preparation to copolymer latex> Add 1.0 parts of sodium dodecylbenzenesulfonate to x0 parts of water.
Add 5 parts and dissolve. To this was added the monomer mixture shown in Table 1, and further added 0.2 t of dodecyl mercaptan.
and emulsify.

Next, 0.5 part of potassium persulfate was added and the whole was heated to 60°C.
Emulsion polymerization was carried out while maintaining the temperature. Polymerization was stopped when the monomer conversion rate reached 97%. Unreacted monomers in the obtained latex were removed under reduced pressure to form copolymer latex A.
-1 to 3 and A-i, ;i were obtained.

Table 1 <Preparation of copolymer latex (Bl)> Copolymer latex B-1 to B-3 were prepared in the same manner as for copolymer latex 8 except that the monomer mixture in the amount shown in Table 2 was used. and B-1 were obtained.

Table 2 Examples 1 to 3 and Comparative Examples 1 to 6 Antioxidant (Sumilizer S; Sumitomo Chemical Co., Ltd.) was added to 100 parts (solid content) of the latex mixture shown in Table 3.
(manufactured by Kao Soap Co., Ltd.) and 1 part of a surfactant (EMAL 2FN; manufactured by Kao Soap Co., Ltd.) were added to obtain an adhesive composition with a solid content of 47%.

Each of the resulting adhesive compositions was whipped to 3 times its volume in a Hobart mixer and applied to the back of a polypropylene/polyester blended 21-dollar punch carpe bag.
/m' coating amount to impregnate the inside. Thereafter, the carpet samples obtained by drying at 130°C for 5 minutes were tested for moldability, shape retention, and fiber fixation strength based on the following measurement methods.

The results are shown in Table-3.

Aging moldability: After heating the carpet sample in an oven at 180°C for 5 minutes, it was press-molded (for 1 minute) in a concavo-convex mold (part A: 90°) as shown in Figure 1 for molding. provided. This molded product is taken out from the mold and A' shown in Fig. 2 is
The angle of the part was measured and evaluated based on the following criteria.

○: More than 80 degrees (good) △Near 5 to 80 degrees (inadequate) Leave still.

Thereafter, it was taken out of the oven and the angle A shown in FIG. 3 was measured. The change in angle (AA) was evaluated based on the following criteria.

O: Less than 10 degrees (good) △: 10 to 15 degrees (inadequate) ×: 15 degrees (good) The degree of damage was evaluated based on the following criteria.

Q: No adhesive falling off, or good pilling △: Slight adhesive falling off, or slightly poor pilling ×: Much adhesive falling off (powder falling), or poor pilling 4° [Effects of the present invention] The adhesive composition obtained in the present invention can simultaneously exhibit the moldability, shape retention, and fiber fixing strength required for automobile carpets, and the adhesive composition of the present invention can be used to form a thermoplastic resin film. The two-step process of lining can be omitted, which also has the effect of simplifying the carpet manufacturing process and improving productivity.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the mold, Figure 2 is a cross-sectional view of the carpet after thermoforming, and Figure 3 is a cross-sectional view of the carpet after thermoforming, after it has been left in an oven at 90°C for 24 hours. A cross-sectional view of the carpet is shown. A... Mold Mouth... φ Carpet A... Mold is attached at an angle (90 degrees) A'...
Angle A after aging mold...Angle after standing in a 90°C oven for 24 hours

Claims (1)

[Claims] A copolymer latex (A ) 30 to 70 parts by weight (solid content weight equivalent), 10 to 90% by weight of butadiene, 10 to 90% by weight of styrene, and 0 to 80% by weight of other monomers copolymerizable with these. An adhesive composition for carpet lining, characterized in that a mixture of 70 to 30 parts by weight (solid content weight equivalent) of a combined latex (B) is used as a main component.