JPH0949172A - Washing size for textile product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a washing size comprising an α-olefin-modified polyvinyl alcohol, to be used for sizing after washing textile products, and capable of giving textile products high in size pickup, free from discoloration or staining during their ironing and also good in touch feeling. SOLUTION: This washing size comprises a modified polyvinyl alcohol, containing 1-24 (pref. 2-9)mol% of α-olefin unit which is prepared by alkali saponification of a copolymer from vinyl acetate and a <=4 deg.C α-olefin such as ethylene. The modified polyvinyl alcohol may contain 0.1-10mol% of cationic group. An aqueous solution of the modified polyvinyl alcohol is fed into the water tank of a domestic washer followed by thoroughly agitation, and a textile product such as a cotton sheet is immersed in the resultant solution, dehydrated, and then air-dried and ironed, thus accomplishing size finishing of the textile product.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel laundry sizing agent for textile products. More specifically, the present invention relates to a laundry sizing agent for textiles, which is composed of a specific modified polyvinyl alcohol and has good heat stability and good texture.

[0002]

2. Description of the Related Art Conventionally, as a laundry sizing agent for textiles, an aqueous solution type of starch, polyvinyl alcohol resin (hereinafter abbreviated as PVA), carboxymethyl cellulose, or polyvinyl acetate emulsion or cationic polymer has been used. Emulsion-type emulsions such as cationic emulsions obtained by emulsion-polymerizing vinyl monomers have been used. However, compared to starch paste, PVA is currently widely used as a water-soluble paste agent because it can be stored for a long period of time without decaying, and the strength of the resulting film provides a crisp texture. . In addition, PVA has better adhesive removal properties during washing than the emulsion type.

[0003]

The conventional PVA-based laundry sizing agent does not have sufficient adhesiveness to synthetic fiber products such as shirt cloth, and the PVA falls off from the fibers during the dehydration process during sizing, so that the sizing agent adheres. It had the disadvantage of a low rate. Further, the heat stability is also poor, and there are problems that the whiteness of the white clothing when it is ironed is reduced, the dirt adheres to the iron, and the like.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve such problems, and as a result, have 4 carbon atoms in the molecule.
Laundry paste for textiles comprising a modified PVA containing 1 to 24 mol% of the following α-olefin unit (the modified PVA may further contain 0.1 to 10 mol% of a cationic group-containing unit). The agent was found and the present invention was completed.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The modified PVA containing 1 to 24 mol% of an α-olefin unit having 4 or less carbon atoms in the molecule used for the laundry sizing agent for textiles of the present invention is a copolymer of vinyl ester and α-olefin having 4 or less carbon atoms. It is obtained by saponifying the coalescence. Examples of the vinyl ester include known ones such as vinyl formate, vinyl acetate, vinyl propionate, vinyl pivalate, etc., but vinyl acetate is economically desirable. The α-olefin used in the present invention has a carbon number of 4 or less, such as ethylene, propylene, n-butene,
Isobutene and the like can be mentioned, but ethylene is preferable because of easy availability of raw materials. As the content of α-olefin,
It should be 1 to 24 mol%, preferably 2 to 9 mol%. If the content of α-olefin is less than 1 mol%, the effect of the present invention cannot be obtained, and if it exceeds 24 mol%, the water-solubility or water dispersibility is deteriorated and the desizing property during washing is poor. Becomes

The modified PVA used in the laundry sizing agent for textiles of the present invention has the purpose of improving water solubility or water dispersibility,
A cationic group-containing unit (meaning a chemical structural unit that dissociates in an aqueous solution and is charged to a positive charge) may be copolymerized.
That is, in the molecule, an α-olefin having 4 or less carbon atoms, a vinyl ester and a cationic group-containing monomer such as trimethyl- (3-acrylamido-3-dimethylpropyl) -ammonium chloride, 3-acrylamidopropyltrimethyl. Ammonium chloride, 3-methacrylamidopropyltrimethylammonium chloride, quaternary ammonium salt of N- (3-allyloxy-2-hydroxypropyl) dimethylamine, N- (4-
Allyloxy-3-hydroxybutyl) diethylamine quaternary ammonium salt, further acrylamide, N-
Methyl acrylamide, N-ethyl acrylamide,
After copolymerization with a quaternary ammonium salt such as N, N-dimethylacrylamide, diacetoneacrylamide, N-methylolacrylamide, methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, N-methylolmethacrylamide, etc., The desired PVA can be obtained by saponifying this by a known method. The content of these cationic group-containing units is from 0.1 to
10 mol% is preferred. When the content of the cationic group-containing unit is less than 0.1 mol%, the effect of introducing the cationic group is not observed, and when it exceeds 10 mol%, the performance of the modified PVA of the present invention cannot be obtained. However, the production cost is also high, which is economically unfavorable.

Further, the modified PVA used in the laundry sizing agent for textiles of the present invention may be a copolymer of other copolymerizable ethylenically unsaturated monomer within the range not impairing the effects of the present invention. Examples of such ethylenically unsaturated monomers include acrylic acid, methacrylic acid, (anhydrous)
Phthalic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid,
Acrylonitrile, methacrylonitrile, acrylamido-2-methylpropanesulfonic acid and its sodium salt, sodium vinylsulfonate, sodium allylsulfonate, ethyl vinyl ether, butyl vinyl ether, vinyl chloride, vinyl bromide, vinyl fluoride, vinylidene chloride, fluorine Examples thereof include vinylidene chloride and tetrafluoroethylene. Furthermore, in the presence of thiol compounds such as thiolacetic acid and mercaptopropionic acid, vinyl ester monomers such as vinyl acetate are copolymerized with α-olefins having 4 or less carbon atoms and saponified to obtain a terminal. Modified PVA can also be used. The content of these ethylenically unsaturated monomer units is preferably less than 2 mol%, more preferably less than 1.0 mol%,
It is more preferably less than 5 mol%.

The average degree of polymerization of the modified PVA used in the laundry sizing agent for textiles of the present invention is usually selected from 100 to 5,000, preferably 200 to 3,000, and the average degree of saponification of its vinyl ester portion is not particularly limited. No, but usually 6
It is 0 to 100 mol%, preferably 70 to 99.9 mol%. If the average degree of polymerization is less than 100, the performance as a laundry sizing agent, in particular, the strength of the film and the adhesive strength to the fiber are reduced, and if it exceeds 5,000, the viscosity of the sizing solution becomes too high, which is not preferable in terms of workability. The average saponification degree is 6
If it is less than 0 mol%, the water-solubility or water-dispersibility is deteriorated and the de-sticking property at the time of washing becomes unfavorable.

In many cases, the modified PVA-based laundry sizing agent of the present invention is sufficiently effective with the modified PVA alone, but other known auxiliaries such as an oil agent, a surfactant, and a softening agent may be used as necessary. It is acceptable to add agents, fragrances, fluorescent dyes, pigments, preservatives, fungicides, bactericides, etc. Further, other known sizing agents such as raw starch, modified starch (cationized starch, carboxymethylated starch, etc.), general PVA, and modified PVA are used within the scope of the present invention.
You may use together (carboxyl group containing modified PVA, acrylamide modified PVA, etc.), carboxymethyl cellulose, water-soluble polyester resin, polyethylene glycol, etc.

When sizing is performed after washing the textile, the sizing agent of the present invention has a solid content of 0.2 to 10 relative to the textile.
It is preferable to use it in the range of 5% by weight. The sizing agent of the present invention has a good sizing effect even when diluted with a sufficient amount of water as compared with the conventional PVA-based laundry sizing agent. In addition, the PVA of the present invention
The resin can be effectively used as a spray type finishing agent. Any commercially available spray type container can be used, and the solid concentration of the PVA resin is 1
An aqueous solution prepared to be ˜15% by weight is injected and used. It is very practical as a non-solvent finish. Of course, it can be used as a liquefaction jet type together with a solvent such as dimethyl ether.

The textile product pasted in this way is
By ironing at a temperature of about 170 ° C, there is no discoloration due to heat or adhesion of dirt to the iron, and a crisp finished laundry paste for textiles can be obtained. As described above, the present invention has been described by taking the laundry sizing agent for textile products as an example. However, the sizing agent for textile products of the present invention can be used as a warp sizing agent for textiles, resin processing, printing sizing agent or felt or It can also be effectively used as a binder for non-woven fabrics.

[0012]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the following, "parts" and "%" mean "parts by weight" and "% by weight", respectively, unless otherwise specified.

Example 1 A copolymer of ethylene and vinyl acetate was saponified with an alkali to contain 7.1 mol% of ethylene units, ethylene having a saponification degree of vinyl acetate units of 95.4 mol% and a polymerization degree of 1700. A modified PVA was obtained. The ethylene-modified PVA was evaluated by the following methods. The results are shown in Table 1. (1) Evaluation of tension Using a small household washing machine, 500 g of the ethylene-modified PVA aqueous solution (solid content concentration 10%) obtained above was added to 10 liters of tap water and dispersed well, then 500
g sheet (cotton cloth; broad) was added, and the mixture was stirred and glued for 3 minutes. After that, dehydration with a dehydrator for 30 seconds, air drying,
I ironed and finished. A texture test was performed by comparing the tension of the cloth glued by the above method with the control glue cloth (starch glue). Ten people conducted the test, and the performance of the sizing agent was evaluated by the total score of the following evaluation points. +2: There is tension +1: There is some tension 0: Same as the control -1: There is no tension -2: There is no tension (2) Adhesive agent attachment amount Gluing using the method of (1) -Air-dried cotton sheets After finishing by ironing, the humidity was adjusted at 20 ° C. and 65% RH for 24 hours. The amount of sizing agent attached to this sizing cloth was determined by weighing. (3) Adhesion to iron 17
When ironing at 0 ° C., the state of adhesion of dust to the iron was observed. (4) Thermal coloring property The cotton sheets which were glued and air-dried by the method of (1) above were
After heat treatment at 0 ° C. for 10 minutes, the degree of coloring was observed by comparing with the original fabric (without gluing). Also, a polyester-cotton blended fabric (polyester / cotton = 65/35; cloth for a shirt) was subjected to sizing and finishing in the same manner and evaluated.

Example 2 The same test as in Example 1 was carried out except that an ethylene-modified PVA containing 2.3 mol% of ethylene units, a saponification degree of vinyl acetate portion of 88.0 mol% and a polymerization degree of 1000 was used. went. The results are shown in Table 1.

Example 3 5.5 mol% of ethylene units and 1.0 mol% of a cationic group-containing unit (3-acrylamidopropyltrimethylammonium chloride unit) were contained, and the saponification degree of the vinyl acetate portion was 88.0 mol. %, The same test as in Example 1 was performed except that an ethylene-cationic group-modified PVA having a degree of polymerization of 1700 was used. The results are shown in Table 1.

Comparative Example 1 Commercially available unmodified PVA (Kuraray Poval PVA-CST)
The same test as in Example 1 was carried out except that was used. The results are shown in Table 1.

Comparative Example 2 Commercially available unmodified PVA (Kuraray Poval PVA-210)
The same test as in Example 1 was carried out except that was used. The results are shown in Table 1.

Example 4 An ethylene-vinyl acetate copolymer was alkali-saponified to contain 5.5 mol% of ethylene units, ethylene having a vinyl acetate unit saponification degree of 95.0 mol% and a polymerization degree of 500. A modified PVA was obtained. The ethylene-modified PVA was evaluated by the following methods. Table 2 shows the results. (1) Tension evaluation The obtained 5% aqueous solution of ethylene-modified PVA was prepared, glued to sheets (cotton cloth; broad) using a commercial sprayer, and ironed to finish. A texture test was conducted by comparing the tension of the sizing-treated cloth with a control sizing cloth (starch paste). Ten people conducted the test, and the performance of the sizing agent was evaluated by the total score of the following evaluation points. +2: There is tension +1: There is some tension 0: Same as the control -1: There is no tension -2: No tension (2) Clogging test Using a commercially available atomizer, temperature 20 ° C, humidity 65% RH environment Spraying was performed 10 times / day for 1 month under the conditions of presence / absence of clogging. (3) Adhesion to Iron The adhesion of dust to the iron when the cotton sheets glued by the method (1) above were ironed at 170 ° C. was observed. (4) Thermal coloring property The cotton sheets glued by the method of (1) above are heated at 170 ° C x 170 ° C.
After heat treatment for 10 minutes, the degree of coloring was observed by comparing with the original fabric (without gluing). Also, polyester-
A cotton blended fabric (polyester / cotton = 65/35; cloth for shirts) was also sizing-finished and evaluated in the same manner.

Example 5 5.5 mol% of ethylene units, 1.0 mol% of a cationic group-containing unit (3-acrylamidopropyltrimethylammonium chloride unit) were contained, and the saponification degree of the vinyl acetate portion was 81.9 mol. %, Ethylene with a degree of polymerization of 500
The same test as in Example 4 was conducted except that the cationic group-modified PVA was used. Table 2 shows the results.

Example 6 7.1 mol% of ethylene units and 2.0 mol% of a cationic group-containing unit (3-acrylamidopropyltrimethylammonium chloride unit) were contained, and the saponification degree of the vinyl acetate portion was 73.1 mol. %, Ethylene with a degree of polymerization of 500
The same test as in Example 4 was conducted except that the cationic group-modified PVA was used. Table 2 shows the results.

Comparative Example 3 A test was conducted in the same manner as in Example 4 except that a commercially available unmodified PVA (Kuraray Poval 205) was used in place of the ethylene modified PVA used in Example 4. Table 2 shows the results.

Comparative Example 4 A test was conducted in the same manner as in Example 4 except that a commercially available unmodified PVA (Kuraray Poval 405) was used in place of the ethylene modified PVA used in Example 4. Table 2 shows the results.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

EFFECTS OF THE INVENTION The laundry sizing agent for textile products of the present invention has a high amount of sizing agent attached to not only natural fibers but also synthetic textile products
It is also extremely useful because it is not colored during ironing and does not stain the iron.

Claims (2)

[Claims] 1. A laundry sizing agent for textiles, which comprises a modified polyvinyl alcohol containing 1 to 24 mol% of an α-olefin unit having 4 or less carbon atoms in the molecule. 2. The laundry sizing agent for textiles according to claim 1, wherein the modified polyvinyl alcohol contains 0.1 to 10 mol% of a cationic group-containing unit.