JPS62250288A - Transfer printing of natural silk - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is disclosed in, for example, French Painting Patent Nos. 1223330 and 1
The present invention relates to a natural silk dyeing method to which the well-known transfer dyeing method described in No. 585119 is applied.

It was believed that silk could not be dyed by transfer because silk has no particular affinity or dissolving power for the disperse dyes used in transfer dyeing. To make this possible, JP 53-106883 used a grafted silk fabric, i.e. a fabric of silk threads grafted with styrene or other monomers. It requires a pretreatment of the silk thread, which presupposes the presence of a catalyst, and is therefore rather complex.

Another method for making silk transferable and dyeable is the acylation of silk, which is described in the Chinese magazine "New Textiles" (5eries 22, published December 1980, pages 1-3). This is a fairly complex and expensive method.

A simpler preliminary process is proposed in JP-A-53-78386. The silk fabric is impregnated with 10 to 100% polyhydric alcohol with a boiling point above 140°C. Silk treated in this way can be transferred and dyed using a transfer paper carrying a sublimable basic dye. This publication states that disperse dyes can also be used in addition to basic dyes. The main drawback of the method identified and described in this publication is that the dye does not penetrate into the silk fabric, resulting in completely different shades on the front and back sides of the fabric. Also, the fastness of the dyed products obtained by this method is quite low.

One object of the present invention is to provide a simple method for transfer dyeing silk.

Another object of the present invention is to provide a method for forming a silk fabric in which the color tone of the back side of the silk fabric is almost different from the color tone of the front side.

Another object of the present invention is to provide a method for effectively applying the transfer method to silk fabrics without chemically reacting either the silk thread or the dye.

Another object of the present invention is to provide an economical method for dyeing silk without depriving it of its original texture, luster or other physical properties.

Other objects will become apparent from the description and examples below.

In the present invention, silk fabrics containing 10 to 30 swelling agents are represented by the following formula: It is brought into contact with a dye-dyed transfer sheet and heated to a temperature of 160-210°C for 20-60 seconds.

Among the dyes of the formula Tl+, those in which R is an ethyl group are preferred.

The dye represented by formula (1) is known and can be produced by a known method.

In the present invention, the temperature is preferably 150°C because it has a swelling effect.
The silk is pretreated with a chemical auxiliary having a boiling point above, for example a polyhydric alcohol or a derivative thereof or an aqueous solution or dispersion thereof. Swelling agents such as silk products at least 10%
After impregnating with an aqueous solution or dispersion containing preferably 15 to 30% by weight and squeezing to a squeezing rate of 50 to 100%, the product may be subjected to intermediate drying. The temperature of intermediate drying depends in particular on the swelling agent used, but is generally lower than 120°C. Spraying or coating methods can also be used to apply the swelling agent.

As swelling agents for silk used in the present invention, the following polyhydric alcohols or derivatives thereof can be mentioned: Alkylene glycol Example t: ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene Glycols, butanediol, bentanediol, hexylene glycol or octylene glycol; alkylene glycol mono- and diethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, dipropylene glycol monomethyl Ethers; alkylene glycol mono- and diesters such as ethylene glycol monoacetate, ethylene glycol diacetate; polyalkylene glycols such as average molecular weight i 200-4
000 polyethylene glycol, average molecular weight 40
Polypropylene glycol with an average molecular weight of 0 to 5000 or polyethylene glycol/polypropylene glycol block copolymers with an average molecular weight of 400 to 5000: 1-butoxyethoxypropanol, polyhydric alcohols such as glycerin, trimethylolpropane, addition products of polyhydric alcohols and alkylene oxides; Addition products of alcohols and lactones@Most preferred among these are polyalkylene glycols such as polyethylene glycol (average molecular weight 250-1000), polypropylene glycol (average molecular weight 250-1000), polyethylene glycol borate esters.

According to the present invention, the pretreated product is placed under or on top of a transfer sheet that has been predyed with a dyeing ink containing the sublimable disperse dye, and heated under pressure in a stacked state to transfer the sublimable dye into the textile product. to sublimate. Since the pretreated auxiliary agent is a high boiling point auxiliary agent that cannot be removed by distillation, it is desirable to remove the pretreated auxiliary agent by washing with water after transfer dyeing in order to fix and stabilize the dye on the fine soil.

As a transfer sheet, a temporary support such as paper or a film is coated with the above-mentioned sublimable disperse dyes and binders such as methylcellulose, ethylcellulose, hydroxypropylcellulose, hydroxyethylcellulose, polyvinylpyrrolidone, gelatin, polyvinyl alcohol, polyacrylamide, acrylic acid. Any known sheet having a dyed pattern dyed with an ink containing esters or methacrylic esters can be used. These transfer sheets and their manufacture are well known in the art and no further explanation is deemed necessary.

The transfer itself is 160-210°C, preferably 180-1
It is carried out at a temperature of 90° C. for 20 to 60 seconds, preferably 30 to 50 seconds. Yellowing of silk can be prevented by performing the transfer at the lowest possible temperature within the above range or by using a transfer paper coated with an optical brightener that sublimes at 160-210°C. This auxiliary agent is described in French Painting Patent No. 1,574,528, which also describes the preparation of transfer sheets from it.

After transfer, the transfer paper can be removed from the silk and the silk can then be rinsed and dried to remove the swelling agent.

The dyed silk may be post-treated in a conventional manner to impart elasticity, luster and texture to the silk fabric. These treatments are generally applied to silk fabrics to increase their commercial value.

The fabric thus dyed exhibits the same or substantially the same shade on both sides.

Silk products can be dyed according to the invention.

It is also possible to dye products made of silk and synthetic or semi-synthetic fibers in the same uniform color in both the sheath part and the synthetic or semi-synthetic part. Furthermore, one of the importance of using the method of the present invention is that good results can be obtained even when applying this method to textiles, such as lawn or voile, which cannot be dyed in general due to their roughness. That's what it means.

The dyed products obtained by the method of the present invention express delicate patterns with sharp outlines and meet consumer demands.

The invention will be explained in more detail by the following examples.

Parts and parts are based on weight.

Example Silk fabric is made of polyethylene glycol (molecular weight 300).
It is immersed in a 0% aqueous solution, squeezed to a squeezing rate of 100 inches, and dried at 70°C for 10 minutes. On the other hand, gravure dyeing was carried out using gravure dyeing ink prepared by dispersing 10 parts of the dye represented by the formula and 6 parts of ethyl cellulose in a mixed solvent of impropatur/ethanol (l:). A paper sheet is dyed and dried to produce a transfer dyed sheet.

The above film treated with polyethylene glycol (molecular weight 300) was layered with a transfer sheet and placed in a flat plate press for 20 minutes.
This is heated at 0°C for 30 seconds at a pressure of I kg/
Press with cm2.

The dyed silk is immersed in water, squeezed to a squeezing rate of 70 inches, and dried at 100° C. for 4 minutes.

The resulting fabric exhibits a yellow pattern with the same tone on both sides.

Although the present invention has been described in detail above, other specific examples of the configuration of the present invention are summarized as follows.

(1) A dyed silk obtained by the method described in claims (1) to (5) above.

Claims (5)

[Claims] (1) Silk containing 10 to 30% swelling agent has the formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (I) (In the formula, R is an alkyl group having 1 to 4 carbon atoms, especially a methyl group, an ethyl group. or isopropyl group) and heated to a temperature of 160 to 210°C for 20 to 60 seconds. Transfer dyeing method. (2) The method according to the preceding item (1), wherein a woven or knitted fabric made of 100% silk or a blend of silk and synthetic fibers is used as the silk. (3) polyhydric alcohol or its derivative as a swelling agent;
The method described in the preceding item (1), wherein polyethylene or polypropylene glycol preferably having a molecular weight of 300 to 500 is used. (4) The method described in the preceding item (1), wherein the silk is separated from the transfer sheet after heating and rinsed. (5) The method described in the preceding paragraph (1) using the yellow dye represented by the formula (I), which has a mathematical formula, chemical formula, table, etc.