CN115233452B - Aqueous solution type cation formaldehyde-free elastic finishing agent for cotton and preparation method thereof - Google Patents

Abstract

The invention discloses a cationic formaldehyde-free elastic finishing agent for aqueous cotton and a preparation method thereof, wherein the cationic formaldehyde-free elastic finishing agent comprises the following components in percentage by mass: vinyl acetate: 8-11%; water-soluble acrylate monomers: 24-27%; acrylamide derivative crosslinking monomer: 0.5 to 2 percent; cationic monomer: 3 to 6 percent; and (3) an initiator: 0.1 to 0.4 percent; neutralizing alkali: 0.1 to 0.25 percent; the balance being pure water. The cationic formaldehyde-free elastic finishing agent for the aqueous cotton and the preparation method thereof are adopted, an emulsifier is not used, wet rubbing fastness is not affected, and the cationic property has high affinity and good adsorptivity to cotton fabrics; the cation formaldehyde-free elastic finishing agent for the aqueous cotton has the advantages of no forbidden substances and formaldehyde, and the fabric has the advantages of active and bone feeling after finishing, good elasticity and drapability, smooth and fine cloth cover, unique hand feeling style and functionality, and low cost, thereby greatly improving the quality and added value of the cotton fabric.

Description

Aqueous solution type cation formaldehyde-free elastic finishing agent for cotton and preparation method thereof

Technical Field

The invention relates to the technical field of textile chemicals, in particular to a cationic formaldehyde-free elastic finishing agent for aqueous cotton and a preparation method thereof.

Background

Cotton fibers have a long history as a textile material, and as early as four thousand years ago, people began to spin and weave with cotton. Cotton fibers have long been active on the stage of textile materials. To date, cotton fibers are still the dominant force of textile raw materials, the amount of fibers used in the cotton textile industry per year is more than 60% of the total amount of the whole textile fibers, the product outlet is about 30% of the total amount of textile and clothing outlet, the total amount of processed fibers in the textile industry in China exceeds 2000 ten thousand t in 2003, and the total amount of natural fibers 714 ten thousand t in 2003, wherein the raw cotton 622 ten thousand t.

Cotton textile products occupy places in the textile industry that other products cannot replace. In the 80 s of the 20 th century, chemical fibers with various properties are continuously emerging due to the rising of chemical fiber industry, and development and application of cotton textile products are greatly impacted, but in recent years, with the continuous improvement of living standard and environmental awareness of people, cotton fibers are more and more popular with people due to the advantages of wearing comfort, renewability, biodegradability and the like, and the special charm of the cotton fibers is continuously exerted. Cotton fabrics, which are the generic name for various cotton textiles, are commonly used in the manufacture of fashion clothing, casual wear, underwear, and shirts. Based on the performance of cotton fiber, the cotton fabric has the advantages of good hydroscopicity, hygroscopicity, easy dyeing, soft hand feeling, moderate strength, comfortable wearing and the like, but has the defects of poor crease resistance, easy shrinkage, poor shape retention, low dyeing fastness and the like. With the rapid development of the domestic clothing industry, the market has higher requirements on the quality and grade of cotton fabrics. Therefore, how to improve the handfeel style quality and the added value of the product of the cotton fabric becomes a key problem which needs to be solved by dyeing workers currently.

Currently, there are three main types of elastic finishing agents on the market: polyurethane, 2D permanent press resin and polyacrylate emulsion. Polyurethane is expensive, thus limiting the use of such finishes; formaldehyde can be released from the 2D resin in the processing process, and formaldehyde residues can be formed in the finished fabric, so that the fabric is not environment-friendly; the emulsifiers in the polyacrylate emulsion lead to a reduction in the wet-abrasion fastness of the fabric, and if N-methylolacrylamide is used as crosslinking monomer, the finished cloth cover also has a small amount of formaldehyde residues. The problem that the emulsifier in the existing emulsion type elastic finishing agent affects wet friction fastness is solved, and therefore the invention provides the cationic aldehyde-free elastic finishing agent for the aqueous solution type cotton.

Disclosure of Invention

The invention aims to provide the aqueous solution type cation formaldehyde-free elastic finishing agent for cotton, which does not use an emulsifier, has no influence on wet rubbing fastness, and has high affinity and good adsorptivity for cotton fabrics; the cation formaldehyde-free elastic finishing agent for the aqueous cotton has the advantages of no forbidden substances and formaldehyde, and the fabric has the advantages of active and bone feeling after finishing, good elasticity and drapability, smooth and fine cloth cover, unique hand feeling style and functionality, and low cost, thereby greatly improving the quality and added value of the cotton fabric.

In order to achieve the purpose, the invention provides an aqueous solution type cation formaldehyde-free elastic finishing agent for cotton, which comprises the following components in percentage by mass:

vinyl acetate: 8-11%;

water-soluble acrylate monomers: 24-27%;

acrylamide derivative crosslinking monomer: 0.5 to 2 percent;

cationic monomer: 3 to 6 percent;

and (3) an initiator: 0.1 to 0.4 percent;

neutralizing alkali: 0.1 to 0.25 percent;

the balance being pure water;

the acrylamide derivative crosslinking monomer is one or more of methacrylamide, N-hydroxyethyl acrylamide, N-isopropyl acrylamide and N, N-dimethyl acrylamide.

Preferably, the water-soluble acrylate monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.

Preferably, the cationic monomer is one or more of dimethyl diallyl ammonium chloride, trimethyl allyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride.

Preferably, the initiator is one or more of ammonium persulfate, sodium persulfate, potassium persulfate and azo diisobutylamidine hydrochloride.

Preferably, the neutralizing base is one or more of sodium carbonate, sodium bicarbonate, sodium hydroxide and potassium hydroxide.

The preparation method of the cation formaldehyde-free elastic finishing agent for the aqueous solution cotton comprises the following steps:

(1) Heating a part of pure water to 70-85 ℃, wherein the pure water accounts for 18-21% of the total components;

(2) Adding 8-11% of vinyl acetate, 24-27% of water-soluble acrylate monomer, 0.5-2% of acrylamide derivative crosslinking monomer and 3-6% of cationic monomer into the pure water heated in the step (1), and mixing until the mixture is completely dissolved to obtain a mixed solution;

(3) Adding 0.1-0.4% of initiator into a second part of pure water, mixing until the initiator is completely dissolved to obtain an initiator solution, wherein the second part of pure water accounts for 21-24% of the total components;

(4) Simultaneously, respectively dripping the mixed solution and the initiator solution into the reactor, starting a condensation reflux evaporation device, controlling the reaction temperature at 75-84 ℃, continuously dripping for 3-6 hours until dripping is finished, and dripping the initiator solution later; after the dripping is completed, the temperature is raised to 86-89 ℃, and the reaction is carried out for 40-100min under the heat preservation;

(5) Adding 0.1-0.25% of neutralizing alkali into the rest pure water, and mixing until the neutralizing alkali is completely dissolved to obtain neutralizing alkali solution;

(6) And (3) cooling the product obtained in the step (4) to 45 ℃, and adding a neutralizing alkali solution to adjust the pH of the emulsion to 6-9, thereby obtaining the aqueous cationic aldehyde-free elastic finishing agent for cotton.

The invention has the beneficial effects that:

(1) The cation formaldehyde-free elastic finishing agent for aqueous cotton has moderate glass transition temperature (5-15 ℃) of polymer, the finished fabric has certain bone elasticity, the molecular weight of the polymer is large, and a thicker and denser film is formed on the surface of the fiber.

(2) The water-soluble acrylic ester monomer provides a large number of hydroxyl groups, has the characteristics of hydrophilicity, air permeability, moisture permeability and skin friendliness, and forms covalent cross-linking and hydrogen bond association between molecules and hydroxyl groups on cellulose when the finishing agent forms a film, so that reticular cross-linking coverage is formed on the surface of the fabric, and the elasticity, drapability, surface smoothness and fineness of the fabric are improved.

(3) The active groups in the acrylamide derivative crosslinking monomer can undergo self-crosslinking reaction, so that the elasticity of the finishing agent film is further improved.

(4) Most fibers will be negatively charged in water, while the introduction of cationic monomers will increase the adsorption of the finish on the fabric while providing hydrophilicity for the finish synthesis reaction.

(5) The invention has reasonable component proportion, and the components are synergistic, and finally, unique hand feeling style and functionality are formed on cotton fabric.

(6) The preparation method has simple process steps, high process controllability and low requirements on after-finishing equipment, and is suitable for batch production.

The technical scheme of the invention is further described in detail through examples.

Detailed Description

The present invention will be further described with reference to examples in which various chemicals and reagents are commercially available unless otherwise specified.

Example 1

(1) Heating a part of pure water to 70 ℃, wherein the pure water accounts for 21% of the total components;

(2) Adding 8% of vinyl acetate, 27% of hydroxyethyl acrylate, 0.5% of methacrylamide and 6% of dimethyl diallyl ammonium chloride into the pure water heated in the step (1), and mixing until the mixture is completely dissolved to obtain a mixed solution;

(3) Adding 0.4% of ammonium persulfate into a second part of pure water, mixing until the ammonium persulfate and the second part of pure water are completely dissolved to obtain an initiator solution, wherein the second part of pure water accounts for 21% of the total components;

(4) Simultaneously, respectively dripping the mixed solution and the initiator solution into the reactor, starting a condensation reflux evaporation device, controlling the reaction temperature at 75 ℃, continuously dripping for 6 hours until dripping is finished, and dripping the initiator solution later; after the dripping is completed, the temperature is raised to 89 ℃, and the reaction is carried out for 40min under the heat preservation;

(5) Adding 0.1% sodium carbonate into the rest pure water, and mixing until the sodium carbonate is completely dissolved to obtain a neutralizing alkali solution;

(6) And (3) cooling the product obtained in the step (4) to 45 ℃, and adding sodium carbonate solution to adjust the pH of the emulsion to 6 to obtain the aqueous solution type cation formaldehyde-free elastic finishing agent for cotton.

Example 2

(1) Heating a part of pure water to 75 ℃, wherein the pure water accounts for 20% of the total components;

(2) Adding 9% of vinyl acetate, 26% of hydroxypropyl acrylate, 1% of N-hydroxyethyl acrylamide and 5% of trimethyl allyl ammonium chloride into the pure water heated in the step (1), and mixing until the mixture is completely dissolved to obtain a mixed solution;

(3) Adding 0.3% sodium persulfate into a second part of pure water, mixing until the sodium persulfate and the second part of pure water are completely dissolved to obtain an initiator solution, wherein the second part of pure water accounts for 22% of the total components;

(4) Simultaneously, respectively dripping the mixed solution and the initiator solution into the reactor, starting a condensation reflux evaporation device, controlling the reaction temperature at 78 ℃, continuously dripping for 5 hours until dripping is finished, and dripping the initiator solution later; after the dripping is completed, the temperature is raised to 88 ℃, and the reaction is carried out for 60 minutes;

(5) Adding 0.15% sodium bicarbonate into the rest pure water, and mixing until the sodium bicarbonate is completely dissolved to obtain a neutralized alkali solution;

(6) And (3) cooling the product obtained in the step (4) to 45 ℃, and adding sodium bicarbonate solution to adjust the pH of the emulsion to 7, thereby obtaining the aqueous solution type cation formaldehyde-free elastic finishing agent for cotton.

Example 3

(1) Heating a part of pure water to 80 ℃, wherein the pure water accounts for 19% of the total components;

(2) Adding 10% of vinyl acetate, 25% of hydroxyethyl methacrylate, 1.5% of N-isopropyl acrylamide and 4% of acryloyloxyethyl trimethyl ammonium chloride into the pure water heated in the step (1), and mixing until the mixture is completely dissolved to obtain a mixed solution;

(3) Adding 0.2% of potassium persulfate into a second part of pure water, mixing until the second part of pure water is completely dissolved to obtain an initiator solution, wherein the second part of pure water accounts for 23% of the total components;

(4) Simultaneously, respectively dripping the mixed solution and the initiator solution into the reactor, starting a condensation reflux evaporation device, controlling the reaction temperature at 81 ℃, continuously dripping for 4 hours until dripping is finished, and dripping the initiator solution later; after the dripping is completed, the temperature is raised to 87 ℃, and the reaction is carried out for 80 minutes;

(5) Adding 0.2% sodium hydroxide into the rest pure water, and mixing until the sodium hydroxide is completely dissolved to obtain a neutralized alkali solution;

(6) And (3) cooling the product obtained in the step (4) to 45 ℃, and adding sodium hydroxide solution to adjust the pH of the emulsion to 8, thereby obtaining the aqueous solution type cation formaldehyde-free elastic finishing agent for cotton.

Example 4

(1) Heating a part of pure water to 85 ℃, wherein the pure water accounts for 18% of the total components;

(2) Adding 11% of vinyl acetate, 24% of hydroxypropyl methacrylate, 2% of N, N-dimethylacrylamide and 3% of methacryloyloxyethyl trimethyl ammonium chloride into the pure water heated in the step (1), and mixing until the mixture is completely dissolved to obtain a mixed solution;

(3) Adding 0.1% of azodiisobutylamidine hydrochloride into a second part of pure water, mixing until the azodiisobutylamidine hydrochloride is completely dissolved to obtain an initiator solution, wherein the second part of pure water accounts for 24% of the total components;

(4) Simultaneously, respectively dripping the mixed solution and the initiator solution into the reactor, starting a condensation reflux evaporation device, controlling the reaction temperature at 84 ℃, continuously dripping for 3 hours until dripping is finished, and dripping the initiator solution later; after the dripping is completed, the temperature is raised to 86 ℃, and the reaction is carried out for 100min;

(5) Adding 0.25% potassium hydroxide into the rest pure water, and mixing until the potassium hydroxide is completely dissolved to obtain a neutralized alkali solution;

(6) And (3) cooling the product obtained in the step (4) to 45 ℃, and adding potassium hydroxide solution to adjust the pH of the emulsion to 9, thereby obtaining the aqueous solution type cation formaldehyde-free elastic finishing agent for cotton.

The cationic aldehyde-free elastic finishing agent for cotton of the aqueous solution type prepared in each of the above examples was subjected to comparative evaluation of hand feeling and wet abrasion fastness using a commercially available polyacrylate elastic finishing agent as a comparative example. The following is a description of the verification by specific experimental techniques and the data obtained.

1. Fabric: blue combed cotton plain weave drawing frame sweat fabric

2. The dosage of the finishing agent is as follows: 50g/L

3. The finishing process comprises the following steps: two-soaking two-rolling, drying, shaping at 160 ℃ for 60s, conditioning, testing performance and index, and the specific results are shown in the following table:

	feel style	Fastness to dry grinding	Fastness to wet milling
				Example 1	Elasticity, activating collaterals, fine and smooth	5	4
Example 2	Elasticity, activating collaterals, fine and smooth	5	4
				Example 3	Elasticity, activating collaterals, fine and smooth	5	4
Example 4	Elasticity, activating collaterals, fine and smooth	5	4
				Comparative example	Elasticity, hardness and roughness	5	3-4
Blank cloth	-	5	4

From the results of the table above, the aqueous cationic aldehyde-free elastic finishing agent for cotton obtained in each example of the present invention has a better hand feel than the polyacrylate emulsion comparative example because the glass transition temperature is suitable and contains a large number of hydrophilic groups, namely hydroxyl groups. The dry milling fastness is equivalent, and the wet milling fastness is reduced because the polymer emulsion of the comparative example contains an emulsifying agent, and the dye is emulsified and washed cleanly.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.

Claims (4)

1. The cation formaldehyde-free elastic finishing agent for the aqueous cotton is characterized by comprising the following components in percentage by mass:

vinyl acetate: 8-11%;

water-soluble acrylate monomers: 24-27%;

acrylamide derivative crosslinking monomer: 0.5 to 2 percent;

cationic monomer: 3 to 6 percent;

and (3) an initiator: 0.1 to 0.4 percent;

neutralizing alkali: 0.1 to 0.25 percent;

the balance being pure water;

the acrylamide derivative crosslinking monomer is one or more of methacrylamide, N-hydroxyethyl acrylamide, N-isopropyl acrylamide and N, N-dimethyl acrylamide;

the water-soluble acrylate monomer is one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate;

the cationic monomer is one or more of dimethyl diallyl ammonium chloride, trimethyl allyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride.

2. The aqueous cationic formaldehyde-free elastic finishing agent for cotton of claim 1, wherein: the initiator is one or more of ammonium persulfate, sodium persulfate, potassium persulfate and azo diisobutylamidine hydrochloride.

3. The aqueous cationic formaldehyde-free elastic finishing agent for cotton of claim 1, wherein: the neutralizing base is one or more of sodium carbonate, sodium bicarbonate, sodium hydroxide and potassium hydroxide.

4. A process for the preparation of an aqueous cationic formaldehyde-free elastomeric finish for cotton as claimed in any one of claims 1 to 3, comprising the steps of:

(1) Heating a part of pure water to 70-85 ℃, wherein the pure water accounts for 18-21% of the total components;

(2) Adding 8-11% of vinyl acetate, 24-27% of water-soluble acrylate monomer, 0.5-2% of acrylamide derivative crosslinking monomer and 3-6% of cationic monomer into the pure water heated in the step (1), and mixing until the mixture is completely dissolved to obtain a mixed solution;

(3) Adding 0.1-0.4% of initiator into a second part of pure water, mixing until the initiator is completely dissolved to obtain an initiator solution, wherein the second part of pure water accounts for 21-24% of the total components;

(4) Simultaneously, respectively dripping the mixed solution and the initiator solution into the reactor, starting a condensation reflux evaporation device, controlling the reaction temperature at 75-84 ℃, and continuously dripping for 3-6 hours until the dripping is completed, wherein the initiator solution is later dripped; after the dripping is completed, heating to 86-89 ℃, and reacting for 40-100min at the temperature;

(5) Adding 0.1-0.25% of neutralizing alkali into the rest pure water, and mixing until the neutralizing alkali is completely dissolved to obtain neutralizing alkali solution;

(6) And (3) cooling the product obtained in the step (4) to 45 ℃, and adding a neutralizing alkali solution to adjust the pH of the emulsion to 6-9, thereby obtaining the aqueous cationic aldehyde-free elastic finishing agent for cotton.