JPS5817778B2 - Adhesive for temporary fixation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive for fixing films, drafting paper, paper patterns, etc. in tracing, drafting, and sewing, and for fixing fabrics as a base agent in adhesive labels and screen printing. For temporary fixing, it has excellent fixing adhesive strength obtained by mixing a polymer mainly composed of methacrylic acid or an alkyl ester thereof and a fluororesin, and has good peeling performance when peeling off the object to be fixed. This relates to adhesives.

Conventionally, acrylic, vinyl, and rubber adhesives are well known for temporarily fixing and adhering paper, fabric, film, wood, plastic, metal, and glass to each other or in any combination, but after the purpose is completed. When an object is to be peeled off, these adhesives cannot be easily peeled off, and these adhesives adhere to the object, causing contamination or damage due to poor peeling.

For example, in tracing drawing, an adhesive is applied to the surface of a glass plate or drawing board and dried to form an adhesive layer, and then a film, drawing paper, etc. is crimped and fixed to this layer, but when it is peeled off after completion, the releasability is inadequate. There are many disadvantages in that the adhesive layer migrates and adheres to films, papers, etc., causing stains and tearing.

Furthermore, since it is necessary to use the pattern repeatedly when pasting the fabric and pattern together during sewing, an adhesive layer is formed on the surface of the pattern using the previous method, but this method has drawbacks such as contamination of the fabric by the adhesive layer and damage to the pattern when peeled off. Ta.

Also, pressure-sensitive adhesives are used for adhesive labels, which are used to attach to all kinds of materials such as product price and quality indications, but they must be peeled off after the purpose is completed.

In this case, conventional products have the drawbacks that the adhesive layer transfers to the material and contaminates it, and the label paper cannot be peeled cleanly, impairing its commercial value.

Next, we will discuss the glazing agent used in screen printing of fabrics.

(Tightening = fixing the fabric to be printed in a stretched state on a printing table or printing belt) It is well known that adhesives and pressure-sensitive adhesives are used as the backing agent, and types include water-soluble types such as starch, etc. Natural horizontal systems, polyvinyl alcohol, alkyl acrylates, vinyl polymers and blends thereof; solvent-based materials include acrylic acid, methacrylic acid or alkyl esters thereof, vinyl-based polymers, silicone-based polymers, and blends thereof; be.

Water-soluble types often have good solvent resistance and are suitable for emulsion pastes containing minerals, turpentine, etc., which are used as printing pastes, but their adhesive strength is inferior to solvent-type ones, so they have the disadvantage of being limited in their range of application.

Most solvent-type materials form an adhesive layer that is insoluble in water and can withstand repeated use without melting during washing with water during the printing process.The reason why solvent-type materials are mainly used has the following disadvantages.

(b) The printing dyeing paste spread on the raw fabric surface during printing penetrates and comes into contact with the adhesive layer, so the adhesive layer is contaminated with dyes, especially disperse dyes and cationic dyes, which may cause problems such as changing the printing pattern or changing the color scheme. A so-called "up-of-print" phenomenon occurs in which the next raw cloth is cross-contaminated from the contaminated area.

(b) If the adhesive strength (raw cloth adhesive strength) of the adhesive is strengthened, the adhesive layer will become soft and threads will easily adhere to it during the printing process. As a result of the damage, uneven dyeing occurs and the phenomenon of unevenness occurs frequently.

On the other hand, if the adhesive force is weakened in order to prevent these problems, this will be improved to a certain extent, but this problem cannot be resolved as long as the adhesive force that allows for bonding is maintained.

(c) The printing paste spun on thin fabrics such as georgette and chiffon penetrates to the surface of the raw fabric, and the colored paste dried by heating forms a film while surrounding the raw fabric, and printing is completed.

At this point, the raw cloth is peeled off from the adhesive layer, but since the film of printing dyeing paste made of locust bean gum, alginate powder, CMC, etc. formed on the raw cloth is strongly adhered to the adhesive layer, the colored paste is removed during peeling. The film had the disadvantage that it splattered and splattered, contaminating others, and areas where it was peeled off unevenly became unevenly dyed.

The present invention uses an adhesive mainly composed of acrylic acid, methacrylic acid, or an alkyl ester thereof, and a fluororesin blended therein, as a temporary fixing adhesive used in the various applications described above, which eliminates the disadvantages of each of them and is capable of absorbing light. It worked.

In particular, polymers A and 3-fluorocarbons mainly consisting of alkyl acrylates having alkyl ester groups of 2 to 8 carbon atoms, alkyl methacrylates having alkyl ester groups of 3 to 12 carbon atoms, acrylic acid, methacrylic acid, etc. B of fluororesins such as tyrene polymer, tetrafluoroethylene polymer, trifluorochloride modified tyrene polymer, tetrafluoroethylene-67-propylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer, etc. solid content weight ratio A:B=65~9
It was confirmed that the blending ratio of 9.8:35 to 0.2 provided excellent adhesiveness, and that once peeled off, it peeled off cleanly.

In particular, when used as a textile adhesive, dye contamination is extremely reduced, and the dry film that is left in contact with the adhesive layer of the textile printing adhesive can be peeled off cleanly without interfering with the adhesive layer. The inventors have discovered that by doing so, it is possible to achieve effects such as preventing staining caused by uneven dyeing and glue flying.

Regarding the above compounding ratio, the more acrylic acid, methacrylic acid, or alkyl ester thereof, the more sticky the resin layer becomes at room temperature, and the greater the amount of fluororesin, the less sticky it becomes.

That is, if the amount of acrylic acid, methacrylic acid or alkyl ester thereof exceeds 99.8 parts by weight, the mold release effect will be poor, and if it is less than 655 parts by weight, the adhesive strength will be insufficient.

The following is an example of the implementation of the present invention.

Example 1゜(Example of use in tracing) Prescription (4) Lauryl methacrylate 18.69 parts by weight 2-ethylhexyl acrylate 7,95 tt2-ethylhexyl methacrylate 7.95 //Styrene
3.98 //Methacrylic acid
1.19 //Ethyl acetate
31.80 //Toluene
28.19 tt benzoyl peroxide 0.24 // (total 100.00 parts by weight) Synthesize a copolymer using the above recipe by normal solution polymerization, and add the following formulation 03) to this so that the solid content weight ratio is 80:20. Example adhesive (A) was prepared by blending the following.

Prescription (8) 37 parts chemically modified chile/polymer 40.0 parts by weight Inglobil alcohol 60.0 // (total 100
．． After applying Example Adhesive H and a conventional pressure-sensitive adhesive to a glass plate and drying to obtain a uniform resin layer, tracing paper was fixed with adhesive and the change in adhesiveness and peeling state over time were observed. Table -
An evaluation of (1) was obtained.

Implementation row 2゜ (row used in screen dyeing) Recipe (A') Lauryl methacrylate 12.40 parts by weight 2-ethylhexyl methacrylate 8.68 n Acrylonitrile 2.48 tt Acrylic acid 1.24 u Ethyl acetate
87.50 //Toluene
37.50 //Benzoyl peroxide 0.20 //(total IG0.GO
Weight part j A copolymer was synthesized by normal solution polymerization using the above recipe, and the following recipe (B') was blended thereto so that the solid content weight ratio was 88:12 to prepare Example Adhesive Sample X→.

Prescription (■) 47 Chemically modified tyrene polymer 23.0 parts by weight Isopropyl alcohol 57.0 Methyl cellosilp 20. Oti (total 100.0 parts by weight) Apply 200gm2 of untreated adhesive and pressure-sensitive adhesive conventional product to a smooth iron plate printing table (hot plate) and dry to obtain a uniform textile layer. After that, the polyester georgette was laid down, a screen mold was placed on top of it, and it was printed with the printing dyeing paste of the following composition under one printing condition.After drying at 40℃ for 30 minutes, the polyester georgette was removed from the printing stand. Each was peeled off and the peeled state was compared.

In addition, the contamination of the adhesive by the dye was compared, and each polyester georgette was steamed, washed with water, saw pinked, and the state of the dyeing was observed, and the evaluations shown in Table (2) were obtained.

Example 3゜ (Example of use in adhesive labels) Prescription (Ie) Uri methacrylate A/ 13.11 parts by weight Butyl acrylate 16.68 // Methyl methacrylate 7.15 tt Acrylic acid
2.78 1/ethyl acetate
23.83 u toluene
36.17 Benzoyl peroxide 0
．． 28 tt (total 100.00 parts by weight) A copolymer was synthesized by normal solution polymerization using the above formulation, and the following formulation (
B") was blended, and two practical row adhesive samples were prepared.

Formula (B) Tetrafluoroethylene polymer 30 parts by weight Inglobil alcohol 40 Methyl cellosolve
20 〃1, 1.1. ) Lichloroethane 10〃 (total 100 parts by weight) On release paper, apply a test gravure coater with a conventional adhesive and a pressure-sensitive adhesive. After drying, apply to a base polyester film (3.8μ thick). An adhesive label for the bonded sample was created by pressure bonding.

Next, the above two kinds of adhesive labels were adhesively fixed to a decorative board, and changes in adhesiveness and peeling state over time were observed, and the evaluations shown in Table 3 were obtained.

Claims (1)

[Scope of Claims] 1. A temporary fixing adhesive characterized by containing a polymer mainly composed of acrylic acid, methacrylic acid, or an alkyl ester thereof and a fluororesin. 2. The temporary fixing agent according to claim 1, which is blended in a ratio of 65 to 99% by weight of a polymer mainly composed of acrylic acid, methacrylic acid, or an alkyl ester thereof, and 35 to 0.2% by weight of a fluororesin. adhesive.