CN113150678A

CN113150678A - Skin-touch UV coating agent for fabric and preparation method thereof

Info

Publication number: CN113150678A
Application number: CN202110488936.3A
Authority: CN
Inventors: 胡剑飞; 张丽丽; 张越炜
Original assignee: JIANGSU LITIAN TECHNOLOGY CO LTD
Current assignee: JIANGSU LITIAN TECHNOLOGY CO LTD
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-07-23
Anticipated expiration: 2041-04-29
Also published as: CN113150678B

Abstract

The invention discloses a skin-feel UV coating agent for fabrics, which comprises the following raw materials in parts by weight: 40-60 parts of ultraviolet curing resin, 30-50 parts of reactive diluent, 1-3 parts of photoinitiator, 1 part of functional assistant, 4-10 parts of elastic powder and 5-20 parts of extinction assistant; wherein the ultraviolet curing resin is the combination of 4-functionality polyurethane acrylate, 2-functionality polyurethane acrylate and 2-functionality polysiloxane polyurethane acrylate; the reactive diluent is a combination of ethoxylated phenyl acrylate and polyethylene glycol (400) diacrylate. The invention also discloses application of the skin-feel UV coating agent for the fabric in preparation of fabric fabrics. The coating agent of the invention is suitable for high-speed automatic production, meets the use requirements of the conventional fabric coating agent, and has good performance of the cured product: the fabric treated by the coating agent is soft, smooth, fine, comfortable and skin-feeling, and the skin-feeling UV coating agent has low cost and no pollution.

Description

Skin-touch UV coating agent for fabric and preparation method thereof

Technical Field

The invention belongs to the field of fabric coating agents, and relates to a fabric skin-feel UV (ultraviolet light curing) coating agent, a preparation method and an application thereof, in particular to a fabric skin-feel UV coating agent based on polyurethane acrylate (PUA), a preparation method and an application thereof, and especially relates to a fabric skin-feel UV coating agent based on 4-functionality polyurethane acrylate, 2-functionality polyurethane acrylate and 2-functionality polysiloxane polyurethane acrylate, a preparation method and an application thereof.

Background

The fabric coating is a composite fabric formed by the action of a coating agent on the surface of base fabric. Coating finishing is essentially a surface finishing technology and is now an indispensable dyeing and finishing process for developing functional fabrics. The coating finishing aims at improving the appearance, hand feeling and application function of fabric, endowing the fabric with one or more special functions, reasonably using the coating agent can ensure that the fabric obtains a graceful and elegant hand feeling style, and also can have the functions of water resistance, stain resistance, radiation resistance, bacteriostasis, flame retardance and the like.

The coating agent is also called fabric coating finishing agent, is a macromolecular compound uniformly coated on the surface of textile fabric, and forms one or more layers of films on the surface of the fabric through the adhesion action, thereby not only improving the appearance and style of the fabric, but also increasing the functions of the fabric.

The conventional coating agents are classified into solvent type and water type according to the medium used. The solvent type has the advantages of high water pressure resistance, good film forming property, quick drying, low solid content and the like, but has the defects of strong permeability on fabrics, rough and hard hand feeling, high toxicity, easy ignition, need of a solvent recovery device and high recovery cost. Compared with a solvent type, the water system type is nontoxic, non-combustible, safe, low in cost, free of recovery, capable of manufacturing thick coating products, beneficial to production of colored coating products, good in coating hydrophilicity, low in water pressure resistance, slow in drying and difficult to attach to filament fabric.

With the development of science and technology and the improvement of modern living standard, consumers gradually pursue the comfort, functionalization and intellectualization of clothes, and simultaneously pursue the hand feeling styles of soft and smooth fabrics, comfort and the like. Since the age of the scientific and environmental protection industry, Shu plus the research of the green textile and the development of the ecological and environmental protection fabric in the textile printing and dyeing industry, the functional comfortable textile becomes the popular research direction in the textile field.

In order to comply with the development trend of low-carbon economy and market, the research and development of the environment-friendly textile coating finishing agent are also quickened, and the UV coating agent gives consideration to the comprehensive requirements of people on various aspects of textile wearability, is environment-friendly, energy-saving and efficient, and is increasingly favored by consumers.

Disclosure of Invention

The invention aims to provide a skin-feel UV coating agent for fabrics, aiming at the defects of the traditional coating agent.

The purpose of the invention can be realized by the following technical scheme:

a skin-touch UV coating agent for fabrics comprises the following raw materials in parts by weight: 40-60 parts of ultraviolet curing resin, 30-50 parts of reactive diluent, 1-3 parts of photoinitiator, 1 part of functional assistant, 4-10 parts of elastic powder and 5-20 parts of extinction assistant; wherein the ultraviolet light curing resin is the combination of 4-functionality polyurethane acrylate, 2-functionality polyurethane acrylate and 2-functionality polysiloxane polyurethane acrylate; the active diluent is the combination of ethoxy phenyl acrylate (PHEA) and polyethylene glycol (400) diacrylate (PEG (400) DA).

Preferably, the skin-feel UV coating agent for the fabric comprises the following raw materials in parts by weight: 40-60 parts of ultraviolet curing resin, 30-50 parts of reactive diluent, 1.5-2.5 parts of photoinitiator, 1 part of functional assistant, 4-8 parts of elastic powder and 5-18 parts of extinction assistant.

The weight ratio of the 4-functionality-degree polyurethane acrylate to the 2-functionality-degree polyurethane acrylate is (3-5) to 1; the weight ratio of the 4-functionality polyurethane acrylate to the 2-functionality polysiloxane polyurethane acrylate is (3-5): 1.

The 4-functionality polyurethane acrylate is the 4-functionality polyurethane acrylate disclosed in CN 103242508A.

The 4-functionality polyurethane acrylate is prepared by the following method: anhydrous citric acid reacts with ethylene oxide or propylene oxide under the action of a catalyst to prepare tetrahydroxy citric acid polyether ester, and then the tetrahydroxy citric acid polyether ester reacts with diisocyanate and hydroxyethyl (meth) acrylate or hydroxypropyl (meth) acrylate to prepare the 4-functionality polyurethane acrylate.

The preparation of the tetrahydroxy citric acid polyether ester comprises the following steps: placing 1mol of anhydrous citric acid into a high-pressure reaction kettle, dropwise adding 5-8 mol of ethylene oxide or propylene oxide, reacting at 155-165 ℃ under the action of a catalyst, controlling the reaction pressure to be 0.2-0.6 MPa, preserving heat for 1-3 hours at 155-165 ℃ after the ethylene oxide or the propylene oxide is dropwise added, cooling to be below 80 ℃, adding activated clay, stirring for 30 minutes, and performing circulating filter pressing until the mixture is clear and transparent to obtain tetrahydroxy citric acid polyether ester; wherein the catalyst is one or a mixture of two or more of sodium formate, potassium formate, sodium benzoate and potassium benzoate in any proportion, and the dosage of the catalyst is 1 to 5 weight percent of the total mass of the anhydrous citric acid and the ethylene oxide or the propylene oxide.

The preparation of the 4-functionality urethane acrylate comprises the following steps: under the catalysis of a catalyst dibutyltin dilaurate, stirring 1mol of tetrahydroxy citric acid polyether ester and 4-4.5 mol of diisocyanate at the temperature of 60-65 ℃, and carrying out heat preservation reaction for 2-3 hours to obtain an intermediate; under the action of a polymerization inhibitor and a catalyst dibutyltin dilaurate, slowly heating the intermediate and 4-6 mol of hydroxyethyl (meth) acrylate or hydroxypropyl (meth) acrylate for 0.5-1 hour to 80-85 ℃, and carrying out heat preservation reaction for 4-5 hours to obtain 4-functionality polyurethane acrylate; wherein the polymerization inhibitor can be p-hydroxyanisole or hydroquinone, the dosage of the polymerization inhibitor is 100-5000ppm, and the dosage of the catalyst dibutyltin dilaurate is 100-3000ppm each time.

The diisocyanate is selected from one of TDI, HDI, IPDI, HMDI and MDI.

The 2-functionality polyurethane acrylate is 2-functionality polycaprolactone polyurethane acrylate disclosed in CN 105801829A.

The above-mentionedThe 2-functionality polyurethane acrylate is prepared by the following method: prepared from Polycaprolactone diol (Polycaprolactone) and isocyanate ethyl Acrylate (2-Isocyanatoethyl Acrylate, AOI for short, CAS number 13641-96-8, molecular formula C₆H₇NO₃Molecular weight: 141.12) to obtain 2-functionality polycaprolactone urethane acrylate.

Preferably, the 2-functionality polyurethane acrylate is prepared by the following method: the material is prepared by stirring polycaprolactone diol and isocyanate ethyl acrylate according to the dosage ratio of 1mol: 1.9-2 mol at 80-95 ℃ under the action of a catalyst and a polymerization inhibitor, and carrying out heat preservation reaction for 3-6 hours; wherein the catalyst is dibutyltin dilaurate, and the dosage of the catalyst is 100-3000ppm of the total mass of polycaprolactone diol and isocyanate ethyl acrylate; the polymerization inhibitor can be p-hydroxyanisole or hydroquinone, and the dosage of the polymerization inhibitor is 100-5000ppm of the total mass of polycaprolactone diol and isocyanate ethyl acrylate.

The polycaprolactone diol is 6-caprolactone monomer (CAS number: 502-44-3, molecular formula: C)₆H₁₀O₂Molecular weight: 114.14) and initiator such as diethylene glycol, ethylene glycol, neopentyl glycol, 1, 4-butanediol, 1, 6-hexanediol, etc., under the action of organic metal catalyst such as zinc acetate, titanate or organic tin, etc.

The 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: the 2-functionality polysiloxane type polyurethane acrylate is prepared by the reaction of polyether modified polysiloxane and isocyanate ethyl acrylate.

Preferably, the 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: the modified polysiloxane modified polyether is prepared by stirring polyether modified polysiloxane and isocyanate ethyl acrylate according to the dosage ratio of 1mol: 1.9-2 mol at 80-95 ℃ under the action of a catalyst and a polymerization inhibitor, and carrying out heat preservation reaction for 3-6 hours; wherein the catalyst is dibutyltin dilaurate, and the dosage of the catalyst is 100-3000ppm of the total mass of the polyether modified polysiloxane and the isocyanate ethyl acrylate; the polymerization inhibitor can be p-hydroxyanisole or hydroquinone, and the dosage of the polymerization inhibitor is 100-5000ppm of the total mass of the polyether modified polysiloxane and the isocyanate ethyl acrylate.

The structural formula of the polyether modified polysiloxane is as follows:

the molecular weight of the polyether modified polysiloxane is 1000-8000, preferably 2000-3000.

The polyether modified polysiloxane is a polydimethylsiloxane and polyoxyethylene copolymer with primary hydroxyl functional groups, has 100 percent of activity, can be used as a modifier of polyurethane resin, can improve the wear resistance of a resin coating, increase the surface smoothness and gloss, improve the heat resistance, hydrophobicity and flexibility of the coating, and can also improve the low-temperature embrittlement phenomenon of the coating.

The polyether-modified polysiloxane can be prepared or purchased as a commercially available product with reference to the following documents:

1. synthesis and performance studies of novel silicone surfactants [ D ]. korea-rich. wuhan university 2004;

2. synthesis of polyether modified polysiloxane and its Performance study [ D ]. Yaohuotao, university of southeast 2016.

Specifically, the polyether modified polysiloxane is selected from the following products of the chemical group ltd of Xinan, Zhejiang, and has the following physical properties:

product type	Hydroxyl value of mgKOH/g	Viscosity/25 deg.C	Molecular weight
				4111	60	200-350cp	2000
4160	62	200-400cp	2400
				4162	55	100-300cp	2700
7520	56	30-60cp	2000

The weight ratio of the ethoxy phenyl acrylate to the polyethylene glycol (400) diacrylate is 1 (1.5-2).

The ethoxy phenyl acrylate is disclosed in Chinese patent CN102633634A, and has the appearance: clear and transparent mucus, the ester content is more than or equal to 98 percent, the acid value is less than or equal to 1mgKOH, the chroma is less than or equal to 50APHA, and the water content is less than or equal to 0.2 percent.

PHEA and PEG (400) DA are reactive diluents, which act to dilute the resin in the UV coating agent and participate in the curing reaction, and both PHEA and PEG (400) DA have good reactivity and provide good flexibility after film formation.

The photoinitiator is a combination of photoinitiator 184 (1-hydroxycyclohexyl phenyl ketone) and photoinitiator TPO (2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide) according to a weight ratio of (7-8) to 1. The photoinitiator absorbs ultraviolet light to initiate curing, and is a core material for UV curing, the photoinitiator 184 mainly initiates middle-surface layer curing, the photoinitiator TPO mainly initiates deep layer curing, and the combination of the two materials achieves a good synergistic curing effect.

The functional auxiliary agent is a combination of a defoaming agent, a wetting dispersant and a flatting agent according to a mass ratio of 1:1: 1.

Preferably, the defoaming agent is a defoaming agent BYK055, the wetting and dispersing agent is a wetting and dispersing agent BYK2009, and the leveling agent is a leveling agent BYK-UV 3505.

The extinction auxiliary agent is a combination of extinction powder and extinction wax powder according to the weight ratio (2.5-3) to 1. The extinction powder and the extinction wax powder cooperatively play an extinction effect of the coating agent based on different extinction principles. And different addition amounts of the extinction auxiliary agent are adjusted within the scope of the invention, so as to obtain different extinction glossiness.

Preferably, the extinction powder is extinction powder Rad2105, and the extinction wax powder is extinction wax powder WN-1135.

The elastic powder is big daily refined elastic powder 5070D, is spherical micro powder formed by a high molecular polymer polyurethane cross-linked body, and has excellent hand feeling and smoothness after being added.

Another object of the present invention is to provide a method for preparing the skin-feel UV coating agent for fabric, comprising: adding ultraviolet curing resin, reactive diluent, photoinitiator, functional assistant and elastic powder into a high-speed dispersion kettle according to a formula, stirring at the rotating speed of 500-1500 rpm for 30-2 hours, adding extinction assistant after stirring uniformly, continuing stirring for 30-2 hours, and defoaming in vacuum after dispersing uniformly to obtain the skin-feel UV coating agent for the fabric.

The vacuum defoaming is carried out for 30 minutes under the vacuum degree of more than-0.096 MPa.

The extinction auxiliary agent is difficult to disperse, and is easy to stir and foam during high-speed dispersion, so that the raw materials except the extinction auxiliary agent are uniformly mixed, the wetting dispersant which is favorable for dispersion and wetting is added in advance for uniform dispersion, and the extinction auxiliary agent is added for uniform dispersion; the defoaming agent is added for dispersion firstly, so that the foaming problem in the high-speed dispersion process can be reduced, the production time is shortened, and the efficiency is improved. And (3) removing the final bubbles after high-speed dispersion in vacuum, so that the UV coating agent product is fine, uniform, slightly transparent, and meanwhile, removing odor and reducing the odor of the product.

The invention also aims to provide application of the skin-feel UV coating agent for the fabric in preparation of fabric fabrics.

Preferably, the application is the application of the skin-feel UV coating agent for the fabric in preparing a surface coating of the fabric.

The invention has the beneficial effects that:

the invention provides high-speed curing performance by 4-functionality polyurethane acrylate, and provides good crosslinking density and mechanical strength after film forming, so that the fabric is smooth and shaped; good flexibility and adhesive force after film forming are provided by the 2-functionality polyurethane acrylate; the 2-functionality polysiloxane type polyurethane acrylate provides good smooth feeling and oily feeling after film forming, improves soft hand feeling, and provides extremely excellent smooth surface and smooth feeling by synergistic action with elastic powder, and endows the coating with elasticity, soft and dense touch (skin feeling). The selected multifunctional reactive diluent has high activity and good flexibility, and is matched with a photoinitiator compounded in a specific proportion, so that the curing speed (drying and curing at 30-60 m/min) of the UV coating agent is remarkably improved, the energy (ultraviolet light cold light source) is saved, the UV coating agent is suitable for high-speed automatic production, and the use requirement of the conventional fabric coating agent is met.

The skin-feel UV coating agent has low cost, no pollution (no Volatile Organic Compound (VOC)), and good performance of a cured product: the coating agent has good washability (adhesive force), and the fabric treated by the coating agent is soft, smooth, fine, comfortable and skin-friendly.

Detailed Description

The technical solution of the present invention is further explained with reference to the specific embodiments.

The elastic powder used in the specific embodiment is DATAIJING elastic powder 5070D.

5070D specification indexes of the Dari refined elastic powder:

name of article

Appearance of the product

Average particle diameter

Oil absorption

Melting Point

Specific gravity of

Bulk density

Non-volatile component

RHU-5070D

White powder

7 micron

48

＞250℃

1.20

0.40g/cc

＞99％

RHU-5070D solvent resistance stability, swelling ratio (%):

example 1

500 g of polycaprolactone diol (Tetto CAPA2100, molecular weight 1000), 141 g (1mol) of isocyanate ethyl acrylate, 0.1 g of dibutyltin dilaurate serving as a catalyst and 0.7 g of p-hydroxyanisole serving as a polymerization inhibitor are put into a 1000mL four-neck flask, the temperature is slowly raised to 80-85 ℃ for 0.5-4 hours, the materials are kept and stirred for reaction for 3-5 hours, and the 2-functionality polycaprolactone polyurethane acrylate with the structure shown as the formula (I) is prepared.

R is:

namely neopentyl glycol is used as a dihydric alcohol initiator in polycaprolactone diol;

a+b＝(1000-104)/114＝7.8596。

example 2

1920 g of anhydrous citric acid (C) are put into a 6L high-pressure reaction kettle₆H₈O₇Molecular weight 192), 40 g sodium formate, heating to 155 deg.C, and starting to drop ethylene oxide (C)₂H₄O, molecular weight 44)2200 g, controlling the temperature to 155-165 ℃ and the pressure to 0.10-0.40 MPa, dropwise adding for 3-4 hours, preserving the heat for 2-3 hours at 155-165 ℃ after finishing dropping, then cooling to below 80 ℃, and discharging to obtain a crude product; adding active white clay 40 g into the crude product, stirring for 30 minutes, and filtering to obtain clear and transparent tetrahydroxy citric acid polyether ester (C)₁₆H₂₈O₁₂Molecular weight 412)4037.6 g, and has the structure shown in formula (II), wherein: n is 2, a + b + c + d is 5.

Into a 3000mL four-necked flask was charged tetrahydroxy citric acid polyether ester (C)₁₆H₂₈O₁₂Molecular weight 412)206 g, IPDI 445 g (2mol), catalyst dibutyltin dilaurate 0.2 g, heating to 60-65 ℃, stirring and heat preserving reaction2-3 hours, then adding 1 g of polymerization inhibitor p-hydroxyanisole, 0.2 g of dibutyltin dilaurate serving as a catalyst and 266 g of hydroxyethyl acrylate, slowly heating to 80-85 ℃ for 0.5-1 hour, carrying out heat preservation reaction for 4-5 hours, discharging, and preparing the 4-functionality polyurethane acrylate, wherein the structure is shown as a formula (III),

wherein the content of the first and second substances,

R₁comprises the following steps:

n＝2，a+b+c+d＝5；

R₂comprises the following steps:

example 3

1000 g of polyether modified polysiloxane (Zhejiang New Enhance chemical group Co., Ltd., UV resin modified special organic silicon product, type: 4111, molecular weight 2000), 141 g (1mol) of isocyanate ethyl acrylate, 0.12 g of catalyst dibutyltin dilaurate and 0.9 g of polymerization inhibitor p-hydroxyanisole are put into a 1000mL four-neck flask, the temperature is slowly raised to 80-85 ℃ for 0.5-4 hours, the mixture is subjected to heat preservation stirring reaction for 3-5 hours, and discharging is carried out, so that 2-functionality polysiloxane type polyurethane acrylate is prepared.

Example 4

162 kg of methylcyclopentane, 198 kg of toluene, 1109.8 kg of ethylene glycol phenyl ether, 625.37 kg of acrylic acid, 7.2 kg of p-hydroxyanisole, 1.8 kg of hypophosphorous acid and 25.6 kg of methane sulfonic acid are put into a 3000L reaction kettle; starting stirring, continuously introducing compressed air into the kettle through a kettle bottom distributor, heating to 85-95 ℃, starting reflux dehydration, carrying out esterification reaction for 9-10 hours at the kettle temperature of 95-105 ℃, detecting the acid value of 10-25mgKOH/g when the reflux dehydration is carried out till no water is discharged, finishing the reaction, and cooling to 40 ℃; adding 43 kg of caustic soda flakes and 108 kg of water, and stirring for 30 minutes; adding 17.3 kilograms of magnesium silicate hydrate, stirring and adsorbing for 30 minutes; then distilling the water and the solvent under reduced pressure at 50-95 ℃ under the vacuum degree of more than-0.098 MPa, wherein the recovered water and the recovered solvent can be directly used in the next neutralization without any treatment after layering, and the solvent can be directly used in the next esterification reaction; after distillation, filter pressing; then 65 kg of alkaline calcium bentonite and 65 kg of calcium oxide are added, stirred for 30 minutes and then circularly filter-pressed until the product is clear and transparent to obtain an ethoxy phenyl acrylate product, and 1521.68 kg of the product is discharged (1544.07 kg of theoretical discharge, 98.55% of yield).

Product index detection results: the appearance is clear and transparent, the ester content is 98.2 percent, the acid value is 0.17mgKOH, the chroma is 30APHA, the water content is 0.06 percent, and the viscosity is 11cps @25 ℃.

Examples 5 to 9

TABLE 1 formulation of skin-feel UV coating for textiles

The uv curable resins of examples 5 to 9 and comparative example 3 were all a combination of the 2-functional urethane acrylate prepared in example 1, the 4-functional urethane acrylate prepared in example 2, and the 2-functional silicone urethane acrylate prepared in example 3 in a weight ratio of 1:4: 1. The uv curable resin in comparative example 1 was 50 parts by weight of 4-functional urethane acrylate, and the uv curable resin in comparative example 2 was 50 parts by weight of 2-functional urethane acrylate.

Examples 5-9, comparative examples 1-3 the reactive diluents were the combination of ethoxyphenyl acrylate and polyethylene glycol (400) diacrylate prepared in example 4 in a weight ratio of 2: 3.

Examples 5 to 9, comparative examples 1 to 3 the photoinitiators were all a combination of photoinitiator 184 (tianjin jiu new materials gmbh) and photoinitiator TPO (tianjin jiu new materials gmbh) in a mass ratio of 8: 1.

In examples 5 to 9 and comparative examples 1 to 3, all the functional auxiliaries are the combination of a defoaming agent BYK055, a wetting dispersant BYK2009 and a flatting agent BYK-UV3505 according to the weight ratio of 1:1:1, and all the functional auxiliaries are products of Bike Germany company.

The elastic powders in examples 5 to 9 and comparative examples 1 to 2 were all the large day refined elastic powder 5070D.

Examples 5 to 9, comparative examples 1 to 3 the matting agents were all a combination of matting powder Rad2105 (Grace, USA) and matting wax WN-1135 (Kreviley (CRAYVALLAC)) in a weight ratio of 3: 1.

Adding the reactive diluent, the ultraviolet curing resin, the photoinitiator, the functional assistant and the elastic powder into a high-speed dispersion kettle according to the formula shown in the table 1, stirring for 2 hours at the rotating speed of 800 revolutions per minute, adding the extinction assistant after stirring uniformly, stirring for 1 hour at the rotating speed of 1000 revolutions per minute, dispersing uniformly, and finally defoaming for 30 minutes at the vacuum degree of more than-0.096 MPa to obtain the ultraviolet curing coating agent.

And (3) testing the performance of the fabric after UV coating finishing:

(1) preparation of the Fabric

Material distribution: 100% denim with a density (warp x fill, root/10 cm) of 194 x 156.

The treatment method comprises the following steps: the denim fabric is cleaned with a standard detergent to remove chemical residues and dirt and dust from the fabric surface and dried naturally. The twill cotton cloth is cut into a specified size before application and then ironed to be flat for later use.

(2) Coating and curing

The UV-curable coating compositions prepared in examples 5 to 9 and comparative examples 1 to 3 were drawn down on a textile fabric to a film thickness of 20 μm. Curing by using an Ultraviolet (UV) curing machine, wherein the energy during curing is 80W/cm, and the curing speed (the speed required by complete curing of a coating film) is 30 m/min.

(3) Application performance testing

And (3) adjusting the spread and cured cloth sample for 24 hours in an environment with the relative humidity of 65% and the temperature of 25 ℃ for application performance test.

The performance test method comprises the following steps:

measuring bending rigidity value: and (3) respectively testing three different positions of the fabric sample in the warp direction and the weft direction by adopting a model DC-RRY1000 type computer measurement and control softness instrument, wherein the average value is respectively taken for 3 times, and the larger the bending rigidity value is, the worse the softness is.

Measuring hydrophilicity: a25-drop/ml dropper is used for vertically dropping a drop of water at a position 5cm above the fabric, the time for the drop to be completely absorbed by the fabric in a static state is recorded, and the fabric sample is taken and tested at different positions for 3 times to obtain an average value. The shorter the time the fabric takes to absorb moisture, the better the hydrophilicity of the fabric.

Testing the breaking strength: and (3) respectively testing the warp-wise breaking strength and the weft-wise breaking strength by using an electronic fabric strength tester according to the breaking strength of the test sample tested by GB/T3923.1.

Evaluation of hand feeling and hand feeling value: the method comprises the following steps of subjective evaluation method, gathering 10 skilled personnel for blind test, selecting a rank method to evaluate the fabric by a one-pinch two-touch three-grab method under a certain environment, and averaging, wherein results in a group of evaluation data are divided into five grades, so that "_★"means that five of them are the best and one is the worst"_★"more means better hand feel and more comfortable to touch than other fabrics; the objective evaluation method is characterized in that a fabric hand feeling instrument is used for evaluating smoothness, softness, coolness, dryness, fluffiness, tightness, light and heavy feeling and the like of the fabric, and predicted values of each hand feeling index and a total hand feeling value from 1 to 10 are given, wherein the total hand feeling value is a comprehensive index and represents the total hand feeling grade of the fabric, and the higher the predicted value is, the higher the grade of the hand feeling is. Part of the hand feel index consists of two words of opposite meaning so that there is a clear definition of the hand feel index.

The results are shown in Table 2.

TABLE 2 ultraviolet light curing coating agent finishing textile properties

Note: comparative example 4 is a blank fabric. The breaking strength is the warp breaking strength, and the elongation at break is the warp elongation at break.

The polysiloxane type polyurethane acrylate can endow the fiber matrix with soft and lubricating performance, and has synergistic effect with the elastic powder, so that the fabric has extremely excellent lubricating surface and smooth feeling, and the coating is endowed with elasticity and soft and dense touch (skin feeling). As can be seen from Table 2, after the fabrics are processed into films by the UV-curable coating agents of examples 5 to 9, the set performance requirements are met, the softness, elasticity and hand feeling evaluation of the fabrics are improved, and the UV-curable coating agent is suitable for preparing fabric fabrics. Compared with a blank fabric, the comparative example 1 has a larger bending rigidity value and harder hand feeling because 2-functionality polyurethane acrylate is not added; comparative example 2, because 4-functionality urethane acrylate was not added, the bending stiffness was reduced, but the formulation system was incomplete, resulting in less than ideal fabric properties far inferior to those achieved using the coating agent of the present invention. Comparative example 3 had poor hand evaluation because no elastic powder was added.

Claims

1. A skin-feel UV coating for textiles, characterized by: comprises the following raw materials in parts by weight: 40-60 parts of ultraviolet curing resin, 30-50 parts of reactive diluent, 1-3 parts of photoinitiator, 1 part of functional assistant, 4-10 parts of elastic powder and 5-20 parts of extinction assistant; wherein the ultraviolet light curing resin is the combination of 4-functionality polyurethane acrylate, 2-functionality polyurethane acrylate and 2-functionality polysiloxane polyurethane acrylate; the active diluent is the combination of ethoxy phenyl acrylate and polyethylene glycol (400) diacrylate.

2. The skin-feel UV coating agent for fabric according to claim 1, characterized in that: the skin-touch UV coating agent for the fabric comprises the following raw materials in parts by weight: 40-60 parts of ultraviolet curing resin, 30-50 parts of reactive diluent, 1.5-2.5 parts of photoinitiator, 1 part of functional assistant, 4-8 parts of elastic powder and 5-18 parts of extinction assistant.

3. The skin-feel UV coating agent for fabric according to claim 1, characterized in that: the weight ratio of the 4-functionality-degree polyurethane acrylate to the 2-functionality-degree polyurethane acrylate is (3-5) to 1; the weight ratio of the 4-functionality polyurethane acrylate to the 2-functionality polysiloxane polyurethane acrylate is (3-5): 1.

4. The skin-feel UV coating agent for fabric according to claim 1, characterized in that: the 4-functionality polyurethane acrylate is 4-functionality polyurethane acrylate disclosed in CN 103242508A; the 2-functionality polyurethane acrylate is 2-functionality polycaprolactone polyurethane acrylate disclosed in CN 105801829A; the 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: the 2-functionality polysiloxane type polyurethane acrylate is prepared by the reaction of polyether modified polysiloxane and isocyanate ethyl acrylate.

5. Skin-feel UV coating agent for textiles according to claim 1 or 4, characterized in that: the 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: the modified polysiloxane modified polyether is prepared by stirring polyether modified polysiloxane and isocyanate ethyl acrylate according to the dosage ratio of 1mol: 1.9-2 mol at 80-95 ℃ under the action of a catalyst and a polymerization inhibitor, and carrying out heat preservation reaction for 3-6 hours; wherein the catalyst is dibutyltin dilaurate, and the dosage of the catalyst is 100-3000ppm of the total mass of the polyether modified polysiloxane and the isocyanate ethyl acrylate; the polymerization inhibitor is p-hydroxyanisole or hydroquinone, and the dosage of the polymerization inhibitor is 100-5000ppm of the total mass of the polyether modified polysiloxane and the isocyanate ethyl acrylate.

6. The skin-feel UV coating agent for fabric according to claim 1, characterized in that: the weight ratio of the ethoxy phenyl acrylate to the polyethylene glycol (400) diacrylate is 1 (1.5-2).

7. The skin-feel UV coating agent for fabric according to claim 1, characterized in that: the photoinitiator is a combination of photoinitiator 184 and photoinitiator TPO according to a weight ratio of (7-8): 1; the functional auxiliary agent is a combination of a defoaming agent, a wetting dispersant and a flatting agent according to a mass ratio of 1:1: 1; the elastic powder is 5070D; the extinction auxiliary agent is a combination of extinction powder and extinction wax powder according to the weight ratio (2.5-3) to 1.

8. The skin-feel UV coating agent for fabric according to claim 7, characterized in that: the defoaming agent is a defoaming agent BYK055, the wetting dispersant is a wetting dispersant BYK2009, and the leveling agent is a leveling agent BYK-UV 3505; the extinction powder is extinction powder Rad2105, and the extinction wax powder is extinction wax powder WN-1135.

9. A method for preparing a skin-feel UV coating agent for fabric according to claim 1, characterized in that: the method comprises the following steps: adding ultraviolet curing resin, reactive diluent, photoinitiator, functional assistant and elastic powder into a high-speed dispersion kettle according to a formula, stirring at the rotating speed of 500-1500 rpm for 30-2 hours, adding extinction assistant after stirring uniformly, stirring for 30-2 hours, and defoaming in vacuum after dispersing uniformly to obtain the skin-feel UV coating agent for the fabric.

10. Use of the skin-feel UV coating agent for fabric of claim 1 for the preparation of fabric facing.