JP2606782B2 - Textile upholstery and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laying agent for forming a film having an appropriate tackiness for temporarily fixing a cloth on a printing stand in a printing process, and a method for producing the same. In more detail, the content of an organic solvent that generates toxic gas is regulated to 5% by weight or less and a large amount of a solvent that generates toxic gas is regulated by the regulations for preventing organic solvent poisoning based on the Industrial Safety and Health Law. And a method for producing the same.

[0002]

2. Description of the Related Art In general, printing is carried out by fixing a cloth to be printed on a printing stand (called "landing"), printing a printing paste on the printing cloth via a screen frame, and removing the printing cloth from the printing stand. It is performed in a series of steps of peeling and then dyeing. This step may be partially mechanized, but in any case, a grounding agent for fixing the cloth to be printed on the printing stand is required. (1) Acrylic and methacrylic resins and copolymers thereof, (2)
Silicone resin, (3) styrene butadiene rubber,
(4) A vinyl chloride-vinyl acetate copolymer system or the like is used. Among them, acrylic resins and silicone resins are widely used.

[0003] These lining agents are those in which the above polymer is dissolved in an organic solvent, and the content of the organic solvent is 5%.
It is about 0 to 80%. As the solvent, for the acrylic resin, toluene, xylene, benzene, ethyl acetate, isopropyl alcohol, 1,1,1-trichloroethane and the like are mainly used. In addition, toluene, xylene and the like are mainly used for the silicon-based resin.
Prior to use, these upholstery agents are 1,1,1-trichloroethane, methylene chloride, methyl ethyl ketone,
It may be diluted with acetone or toluene.

[0004]

The solvents used in these prior arts are all organic solvents that generate toxic gases, which are regulated by the above-mentioned regulations for preventing organic solvent poisoning. Therefore, when using conventional adhesives containing these solvents, special equipment must be provided for removing toxic gases generated after use. However, a printing plant that uses a flooring agent requires a building of at least about 450 m ² even at the minimum scale, and is a facility that removes organic solvent vapor generated from such a large area without discharging it to the outside. It was difficult for a textile printing company to provide a print.

The present inventors have attempted solution polymerization of a printing agent with an organic solvent that does not generate toxic gas, but in any case, a basement polymer having satisfactory physical properties was not obtained. A grounding agent using toluene, xylene, ethyl acetate, isopropyl alcohol, carbon tetrachloride, 1,1,1-trichloroethane or the like as a polymerization solvent was excellent in terms of cohesive strength, hardness, adhesiveness and the like of a resin film. . Accordingly, there has been a strong demand for a technique for providing a lining agent that does not generate harmful gas upon use without impairing the physical properties of the lining agent.

[0006]

An object of the present invention is to solve the above-mentioned problems, and the constitution of the present invention is to polymerize a polymer for a grounding agent with a conventional polymerization solvent, and then distill off most of the polymerization solvent. , Does not adversely affect the physical properties of the adhesive, and
It is necessary to replace the total of substances listed as organic solvents in the Schedule 6-2 of the Ordinance for Enforcement of the Industrial Safety and Health Law based on the Industrial Safety and Health Act with a replacement solvent that does not generate harmful gas so that the total amount becomes 5% by weight or less. Features.

The acrylic polymer in the present invention is mainly composed of acrylic acid, methacrylic acid or an alkyl ester thereof, particularly an alkyl acrylate having an alkyl ester group having 2 to 8 carbon atoms,
A polymer mainly composed of alkyl methacrylate having 12 alkyl ester groups is preferred. Further, a copolymer with another monomer such as a fluorine resin, or a polymer blend with another polymer such as a fluorine resin may be used. As a solvent for performing the solution polymerization, a conventionally used polymerization solvent such as toluene, xylene, benzene, ethyl acetate, isopropyl alcohol, carbon tetrachloride, 1,1,1-trichloroethane, etc., is used in a conventional manner. Perform according to.
For example, it can be obtained by the method disclosed in Japanese Patent Publication No. 58-17778.

[0008]

The present invention consists in exchanging the above-mentioned polymerization solvent with a substitution solvent. It is preferable that the substitution solvent not only does not generate a toxic gas, but also evaporates quickly after application to quickly form a resin film. Therefore, a solvent having a boiling point of 70 to 220 ° C, preferably 80 to 150 ° C, more preferably 90 to 130 ° C is used. In addition, affinity with the polymer and stability are particularly important, and as a result of the substitution, the polymer solution becomes cloudy, the film is not formed promptly after application, or the characteristics of the formed film are poor. Things cannot be used.

For satisfying the above conditions, mono-, di- and tripropylene glycol ethers are preferred for acrylic polymers. Ether is methyl or ethyl ether. Monomethyl ether is particularly preferred, but in the case of mono- or dipropylene glycol, dimethyl ether or ethyl ether can also be used. A solvent having a boiling point that is too high is not preferable in terms of work because the solvent volatilizes slowly when used as a grounding agent and the formation of a resin film is delayed. The substitution solvent is not required to be a single substance, and may be a mixture mainly composed of the above solvents.

[0011]

As a method of substitution, the polymerization solvent is first evaporated to a concentration of about 5 to 15%, and then the above-mentioned substitution solvent is added to a desirable concentration and uniformly dissolved. At this time, it is natural that the concentration of the polymerization solvent as a whole is 5% or less. Upon use, a replacement solvent is added even when further diluting. When the boiling point of the polymerization solvent is lower than the boiling point of the substitution solvent by 5 ° C. or more, the substitution solvent is added before the polymerization solvent is volatilized, and the polymerization solvent volatilizes preferentially when volatilized. You can also. In this case, it is preferable that a remarkable boiling point difference exists between the polymerization solvent and the substitution solvent. Alternatively, the polymerization solvent is evaporated to some extent, and then a replacement solvent having a relatively high boiling point is added, followed by further evaporation to reduce the ratio of the polymerization solvent, and finally, a solvent having a preferable boiling point is added to reduce the polymerization solvent to 5% by weight or less. can do. In any case, the polymerization solvent of the grounding agent used is adjusted to 5% or less.

When the displacement distillation is carried out at normal pressure, the treatment temperature becomes higher than the boiling point of the polymerization solvent and is carried out at a high temperature. However, acrylic and silicon-based polymers have very high temperatures (100 ° C.).
), The molecular weight is reduced, the cohesive strength, which is one of the functions as the original adhesive, is reduced, and the viscosity may be reduced. Therefore, this distillation is performed under vacuum or reduced pressure, and the temperature is desirably 80 ° C. or less.

[0014]

In the case of the adhesive, the polymer having the preferable properties as the adhesive is uniformly dissolved in a solvent, and when the solvent is applied to a printing stand, it is quickly evaporated to form a resin film. However, it is required that the formed resin film has preferable properties as a grounding agent. All solvents used to satisfy this requirement volatilize and generate harmful gases, and are regulated by the Ordinance on Prevention of Organic Solvent Poisoning. The present inventors have attempted to synthesize a polymer for a base material using a solvent that does not generate such a harmful gas, but this method has been extremely difficult.

Therefore, an attempt was made to change the solvent of the polymer solution for the adhesive. However, when the solvent of the polymer for the adhesive was changed, the solubility of the polymer changed, and the solution became cloudy.
In many cases, a precipitate was formed, the solvent volatilized slowly, and a long time was required for film formation, or the formed film did not have preferable characteristics in many cases. The present inventors have studied various kinds of solvents which can be exchanged, and which do not deteriorate the properties of the adhesive when replaced, and a method for replacing the same, with the acrylic adhesive having a specific propylene. Glycol ethers have found that a specific aliphatic hydrocarbon is preferable as the silicon-based base material, and have completed the present invention.

[0016]

EXAMPLES Example 1 Butyl acrylate 46.2 kg Methyl methacrylate 22.0 kg Acrylic acid 3.3 kg Isopropyl alcohol 25.2 kg Toluene 13.3 kg Benzoyl peroxide 0.3 kg Solution polymerization was performed. The obtained polymer solution was distilled under reduced pressure at 65 ° C. using a spray dryer until isopropyl alcohol and toluene had a solvent content of 10% by weight or less. Next, 100 kg of propylene glycol monomethyl ether and 30 kg of dipropylene glycol monomethyl ether were added to the distillation apparatus and mixed to obtain a grounding agent of the present invention.

Ichinose type automatic screen printing machine # 7000
Was applied to the work table four times using a roller coating device attached to the machine, and printing was performed as usual. As a result, the obtained adhesive has the same cohesive strength, film strength, adhesiveness and durability as the conventional adhesive,
The production of harmful gases has been drastically reduced and the printing work has been performed smoothly.

Example 2 The obtained polymer solution was purified by a distillation apparatus equipped with a condenser.
Except that the temperature was raised to 15 ° C. or higher, the lining agent of the present invention was obtained in the same manner as in Example 1 except that isopropyl alcohol and toluene were distilled until the amount of the solvent became 10% by weight or less, and a printing test was performed. The test results were almost similar to those of Example 1, such as cohesive strength, film strength, tackiness and durability.

[0019]

[0020]

[0021]

[0022]

According to the present invention, it is possible to obtain a lining agent which does not generate harmful gas upon use without impairing the physical properties of the lining agent.

Claims (2)

(57) [Claims] 1. An adhesive for textile printing, wherein the acrylic polymer is dissolved in a solvent containing methyl, ethyl ether of mono, di and tripropylene glycol. 2. Most of the polymerization solvent used for the polymerization of the acrylic polymer monomer is distilled off after completion of the polymerization, and
A method for producing a flooring agent for printing, which comprises exchanging a solvent comprising methyl or ethyl ether of di- and tripropylene glycol.