Preparation method of non-woven fabric with continuous cool feeling

Abstract

The present invention discloses a preparation method of a continuously cool-sensing non-woven fabric, comprising the following steps: 1) preparation and finishing of a phase change microcapsule coating finishing agent; 2) preparation of cool-sensing microcapsule A; 3) preparation of cool-sensing microcapsule B; 4) preparation and finishing of a padding finishing solution of cool-sensing microcapsule A and cool-sensing microcapsule B. The present invention first uses phase change microcapsules to perform coating finishing on both sides of the non-woven fabric so that the non-woven fabric has temperature-regulating performance, and then pads and finishes a cool-sensing finishing agent composed of cool-sensing microcapsules with different core-shell ratios on its surface, which can realize continuous and staged release of cool-sensing substances, thereby achieving a lasting cool-sensing effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-woven fabric manufacturing, and particularly relates to a preparation method of a continuously cool-sensing non-woven fabric. Background Art

[0002] Currently, cool-sensing non-woven fabrics are mainly divided into two categories. One category is to directly introduce cool-sensing substances into the fibers to make cool-sensing non-woven fabrics. The second category is to perform post-treatment on non-woven fabrics by using cool-sensing substances, mainly including phase change materials and cool-sensing functional substances. The cool-sensing functional substances are mainly divided into menthol-based substances with a unique smell that brings a cool-sensing effect and cool-sensing agents such as xylitol, squalene, silk protein, cool-sensing silicone oil, ammonium chloride, ammonium sulfate, etc. that generate a cool-sensing effect by absorbing heat through moisture absorption.

[0003] Directly adding and finishing cool-sensing substances on the fabric surface has problems such as easy loss, poor wash resistance, and non-persistent cool-sensing effect, which can be solved by the method of microcapsule coating. However, the problem is that some cool-sensing substances such as xylitol and ammonium nitrate will only dissolve and absorb heat to generate a cool-sensing effect when in contact with water vapor. The coating of thick shell microcapsules protects the cool-sensing substances while often hindering this effect, resulting in insufficient cool-sensing and non-sustainability.

[0004] Patent CN114657778B modifies xylitol by esterification with unsaturated organic acids, and slowly releases xylitol molecules after contacting skin moisture. Since the hydrolysis process is dynamic, xylitol molecules can be controllably released, thus achieving a persistent and stable cool-sensing effect. However, this method has certain health hazards to the human body, and the preparation method is cumbersome, and it cannot fully exert the cool-sensing effect of xylitol by moisture absorption.

[0005] Therefore, currently, cool-sensing non-woven fabrics still have problems such as insufficient cool-sensing effect and non-persistent cool-sensing. It is of great significance to provide a cool-sensing non-woven fabric with a persistent cool-sensing effect and a stageable release of cool-sensing substances. Summary of the Invention

[0006] Aiming at the problems of insufficient cool-sensing effect of non-woven fabrics and non-persistent cool-sensing effect during later use, especially after bearing external pressure and friction, in the prior art, the present invention provides a preparation method of a continuously cool-sensing non-woven fabric. This preparation method successively finishes a phase change microcapsule temperature-regulating coating and a cool-sensing microcapsule padding layer on the non-woven fabric. Among them, different core-shell ratios of cool-sensing microcapsules are used in combination, improving the persistence of the cool-sensing effect, and obtaining a non-woven fabric with a good cool-sensing effect and a stageable release of the cool-sensing effect.

[0007] The present invention is achieved through the following technical solutions:

[0008] Preparation of non-woven fabric with continuous cool feeling: First, a phase change temperature-regulating coating is finished on both surfaces of the non-woven fabric, and then a cool feeling microcapsule is finished by padding. It includes the following steps:

[0009] (1) Preparation and finishing of the phase change temperature-regulating coating finishing agent: 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water are stirred evenly in proportion to make a coating finishing agent, which is coated on both sides of the non-woven fabric, and the dry weight of single-sided coating is 10-20 g / m 2 , and the drying temperature is 100 °C. The core material of the phase change microcapsules is paraffin, the particle size of the expandable microspheres is 3-5 microns, the core material is one of isobutane and neopentane, the solid content of the microgel emulsion is 40-50%, the thickener is one of polyacrylic acid type and polyurethane type, the cross-linking agent is a water-based blocked isocyanate cross-linking agent, and the non-woven fabric is a spunlace viscose non-woven fabric with a gram weight of 40 g / m 2 .

[0010] (2) Padding finishing of the cool feeling microcapsules:

[0011] Cool feeling microcapsule A 10-40 g / L

[0012] Cool feeling microcapsule B 10-40 g / L

[0013] Cross-linking agent 3-5 g / L

[0014] Water balance

[0015] After mixing each component evenly according to the formula, it is padded and finished on the non-woven fabric coated with phase change microcapsules and dried at 130 °C. The padding process is two-bath two-roll padding, and the pick-up rate is 100%.

[0016] The preparation method of the cool feeling microcapsule A is as follows: S1. Weigh xylitol, dissolve it in water and ethanol, add emulsifier T-80 and stir to obtain an aqueous phase; S2. Take another container, under the rotation speed of 500 rpm, mix monomer acrylonitrile, butyl acrylate with paraffin oil and emulsifier S-80 to obtain an oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 12000-14000 rpm for 15-20 min, then slowly drop the initiator, and react at 70-80 °C for 6-8 h. The reaction product is filtered by suction and washed clean.

[0017] Among them, the mass ratio of the core materials xylitol, ethanol, and water to the wall material reaction monomers is 3 - 1:1; the ratio of acrylonitrile to butyl acrylate is 1:1; the emulsifier accounts for 12 - 14% of the monomers; the initiator is azobisisobutyronitrile; the addition amount of the initiator is 0.3% - 0.5% of the monomers; the mass ratio of water to ethanol is 2:1, and the proportion of xylitol in the mixture of xylitol, water, and ethanol is 50 - 60%; the ratio of paraffin oil to the mixture of core material xylitol, water, and oil is 5:1; the mass ratio of T-80 to S-80 is 1:1.

[0018] The preparation method of the cool feeling microcapsule B is as follows: S1. Weigh xylitol, dissolve it with water and ethanol, add emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, under the rotation speed of 500 rpm, mix the monomers acrylonitrile, butyl acrylate with paraffin oil and emulsifier S-80 to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 6000 - 8000 rpm for 15 - 20 min, then slowly dropwise add the initiator, react at 70 - 80 °C for 6 - 8 h, and filter the reaction product and wash it clean.

[0019] Among them, the mass ratio of the core materials xylitol, ethanol, and water to the wall material reaction monomers is 6 - 4:1; the mass ratio of acrylonitrile to butyl acrylate is 1:1; the emulsifier accounts for 8 - 10% of the monomers; the initiator is azobisisobutyronitrile; the addition amount of the initiator is 0.3% - 0.5% of the monomers; the ratio of paraffin oil to the mixture of core material xylitol, water, and oil is 5:1; the mass ratio of T-80 to S-80 is 1:1; the mass ratio of water to ethanol is 2:1, and the proportion of xylitol in the mixture of xylitol, water, and ethanol is 50 - 60%.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) By selecting and using different core-wall ratio cool feeling microcapsules and taking advantage of the difference in the shell material strength, a long-lasting cool feeling effect is achieved. When the non-woven fabric finished with the cool feeling microcapsules is used and subjected to mechanical friction and pressing, the microcapsules with a high core-wall ratio are more likely to rupture and release the cool feeling substances of xylitol, ethanol, and water; the shell material of the microcapsules with a lower core-wall ratio is thicker and has higher strength, and will rupture only under the action of external forces of longer duration and higher intensity. This gradient arrangement of the shell material strength enables the release of the cool feeling substances to be stagewise and continuous;

[0022] 2) By adding a phase change material microcapsule coating between the cool feeling microcapsule impregnation layer and the non-woven fabric, the cool feeling effect is further enhanced, and the non-woven fabric is given a temperature regulation effect. The introduction of the expanded microspheres in the coating finishing forms a microporous structure, which is beneficial to improving the hand feeling of the non-woven fabric and increasing the air permeability. Using the microgel emulsion can make the non-woven fabric have a gel-like soft hand feeling. Specific embodiments

[0023] The present invention will be further described in detail below in conjunction with specific embodiments to better understand the technical solution.

[0024] Example 1

[0025] Preparation and finishing of the phase change temperature regulating coating finishing agent: 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water are stirred evenly in proportion to prepare the coating finishing agent, which is respectively coated on both sides of the non-woven fabric, and the dry weight of single-sided coating is 10 g / m 2 , and the drying temperature is 100 °C.

[0026] Preparation of cool feeling microcapsule A: S1. Dissolve 30 g of xylitol in 20 g of water and 10 g of ethanol, add 2.1 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and at a rotation speed of 500 rpm, mix 15 g of acrylonitrile, 15 g of butyl acrylate with 300 g of paraffin oil and 2.1 g of emulsifier S-80 to obtain the oil phase; S3. Under N2 protection, quickly add the oil phase to the aqueous phase, homogenize at 13000 rpm for 20 min, then slowly drop 0.09 g of azobisisobutyronitrile, and react at 72 °C for 8 h. The reaction product is filtered by suction and washed clean.

[0027] Preparation of cool feeling microcapsule B: S1. Weigh 30 g of xylitol and dissolve it in 20 g of water and 10 g of ethanol, add 0.54 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and at a rotation speed of 500 rpm, mix 6 g of acrylonitrile, 6 g of butyl acrylate with 300 g of paraffin oil and 0.54 g of emulsifier S-80 to obtain the oil phase; S3. Under N2 protection, quickly add the oil phase to the aqueous phase, homogenize at 6000 rpm for 20 min, then slowly drop 0.036 g of azobisisobutyronitrile, and react at 70 °C for 7 h. The reaction product is filtered by suction and washed clean.

[0028] Pad finishing of cool feeling microcapsules

[0029] After mixing 20 g / L of cool feeling microcapsule A, 20 g / L of cool feeling microcapsule B, and 4 g / L of crosslinking agent evenly, pad finishing is carried out on the non-woven fabric coated with phase change microcapsules, and it is dried at 130 °C to obtain the non-woven fabric with continuous cool feeling. The padding process is two-bath two-roll padding, and the liquor pickup rate is 100%.

[0030] Example 2

[0031] Preparation and finishing of the phase change temperature regulating coating finishing agent: 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water are stirred evenly in proportion to prepare the coating finishing agent, which is respectively coated on both sides of the non-woven fabric, and the dry weight of single-sided coating is 10 g / m 2 , and the drying temperature is 100 °C.

[0032] Preparation of cool-sensation microcapsule A: S1. Dissolve 30 g of xylitol in 20 g of water and 10 g of ethanol, add 2.1 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, mix 15 g of acrylonitrile, 15 g of butyl acrylate with 300 g of paraffin oil and 2.1 g of emulsifier S-80 at a rotation speed of 500 rpm to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 13000 rpm for 20 min, then slowly add 0.09 g of azobisisobutyronitrile dropwise, react at 75 °C for 7 h, and filter and wash the reaction product clean.

[0033] Preparation of cool-sensation microcapsule B: S1. Weigh 30 g of xylitol and dissolve it in 20 g of water and 10 g of ethanol, add 0.4 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, mix 5 g of acrylonitrile, 5 g of butyl acrylate with 300 g of paraffin oil and 0.4 g of emulsifier S-80 at a rotation speed of 500 rpm to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 6000 rpm for 20 min, then slowly add 0.03 g of azobisisobutyronitrile dropwise, react at 78 °C for 6 h, and filter and wash the reaction product clean.

[0034] Padding finishing of cool-sensation microcapsules:

[0035] Mix 20 g / L of cool-sensation microcapsule A, 20 g / L of cool-sensation microcapsule B, and 4 g / L of crosslinking agent evenly, then pad and finish on the non-woven fabric coated with phase-change microcapsules, and dry at 130 °C to obtain the non-woven fabric with persistent cool sensation. The padding process is two-bath two-padding, and the liquor pickup rate is 100%.

[0036] Example 3

[0037] Preparation and finishing of phase-change temperature-regulating coating finishing agent: Stir 50 parts of phase-change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water evenly to prepare the coating finishing agent, and coat it on both sides of the non-woven fabric respectively. The dry weight of single-sided coating is 10 g / m 2 , and the drying temperature is 100 °C.

[0038] Preparation of cool-sensation microcapsule A: S1. Dissolve 30 g of xylitol in 20 g of water and 10 g of ethanol, add 1.2 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, mix 10 g of acrylonitrile, 10 g of butyl acrylate with 300 g of paraffin oil and 1.2 g of emulsifier S-80 at a rotation speed of 500 rpm to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 13000 rpm for 20 min, then slowly add 0.06 g of azobisisobutyronitrile dropwise, react at 70 °C for 8 h, and filter and wash the reaction product clean.

[0039] Preparation of cool-sensation microcapsule B: S1. Weigh 30 g of xylitol, dissolve it with 20 g of water and 10 g of ethanol, add 0.75 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, mix 7.5 g of acrylonitrile, 7.5 g of butyl acrylate with 300 g of paraffin oil and 0.75 g of emulsifier S-80 under the rotation speed of 500 rpm to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 6000 rpm for 20 min, then slowly drop 0.045 g of azobisisobutyronitrile, react at 74 °C for 7 h, and filter and wash the reaction product thoroughly.

[0040] Pad finishing with cool-sensation microcapsules: Mix 20 g / L of cool-sensation microcapsule A, 20 g / L of cool-sensation microcapsule B and 4 g / L of crosslinking agent evenly, then pad and finish on the non-woven fabric coated with phase change microcapsules, and dry at 130 °C to obtain the non-woven fabric with continuous cool-sensation. The padding process is two-bath two-roll padding, and the pick-up rate is 100%.

[0041] Comparative Example 1

[0042] Preparation and finishing of phase change temperature-regulating coating finishing agent: Stir 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener and 14 parts of water evenly to prepare the coating finishing agent, and coat it on both sides of the non-woven fabric respectively. The dry weight of single-sided coating is 10 g / m 2 , and the drying temperature is 100 °C.

[0043] Preparation of cool-sensation microcapsule A: S1. Take 30 g of xylitol, dissolve it with 20 g of water and 10 g of ethanol, add 2.1 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, mix 15 g of acrylonitrile, 15 g of butyl acrylate with 300 g of paraffin oil and 2.1 g of emulsifier S-80 under the rotation speed of 500 rpm to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 13000 rpm for 20 min, then slowly drop 0.09 g of azobisisobutyronitrile, react at 72 °C for 8 h, and filter and wash the reaction product thoroughly.

[0044] Pad finishing with cool-sensation microcapsules:

[0045] Mix 40 g / L of cool-sensation microcapsule A, 0 g / L of cool-sensation microcapsule B and 4 g / L of crosslinking agent evenly, then pad and finish on the non-woven fabric coated with phase change microcapsules, and dry at 130 °C to obtain the non-woven fabric with continuous cool-sensation. The padding process is two-bath two-roll padding, and the pick-up rate is 100%.

[0046] Comparative Example 2

[0047] Preparation and finishing of the phase change temperature-regulating coating finishing agent: 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water are stirred evenly in proportion to prepare the coating finishing agent, which is respectively coated on both sides of the non-woven fabric, and the dry weight of single-sided coating is 10 g / m 2 , and the drying temperature is 100 °C.

[0048] Preparation of the cool-sensation microcapsule B: S1. Weigh 30 g of xylitol, dissolve it with 20 g of water and 10 g of ethanol, add 0.54 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and under the condition of a rotation speed of 500 rpm, mix 6 g of acrylonitrile, 6 g of butyl acrylate with 300 g of paraffin oil and 0.54 g of emulsifier S-80 to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 6000 rpm for 20 min, then slowly drop 0.036 g of azobisisobutyronitrile, react at 78 °C for 6 h, and filter and wash the reaction product thoroughly.

[0049] Padding finishing of the cool-sensation microcapsule:

[0050] After uniformly mixing 0 g / L of cool-sensation microcapsule A, 40 g / L of cool-sensation microcapsule B, and 4 g / L of crosslinking agent, perform padding finishing on the non-woven fabric coated with phase change microcapsules, and dry at 130 °C to obtain the non-woven fabric with continuous cool-sensation. The padding process is two-bath two-roll padding, and the liquor pickup rate is 100%.

[0051] Comparative Example 3

[0052] Preparation of the cool-sensation microcapsule A: S1. Take 30 g of xylitol, dissolve it with 20 g of water and 10 g of ethanol, add 2.1 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and under the condition of a rotation speed of 500 rpm, mix 15 g of acrylonitrile, 15 g of butyl acrylate with 300 g of paraffin oil and 2.1 g of emulsifier S-80 to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 13000 rpm for 20 min, then slowly drop 0.09 g of azobisisobutyronitrile, react at 72 °C for 8 h, and filter and wash the reaction product thoroughly.

[0053] Preparation of the cool-sensation microcapsule B: S1. Weigh 30 g of xylitol, dissolve it with 20 g of water and 10 g of ethanol, add 0.54 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and under the condition of a rotation speed of 500 rpm, mix 6 g of acrylonitrile, 6 g of butyl acrylate with 300 g of paraffin oil and 0.54 g of emulsifier S-80 to obtain the oil phase; S3. Under the protection of N2, quickly add the oil phase to the aqueous phase, homogenize at 6000 rpm for 20 min, then slowly drop 0.036 g of azobisisobutyronitrile, react at 70 °C for 7 h, and filter and wash the reaction product thoroughly.

[0054] Padding finishing of the cool-sensation microcapsule:

[0055] After mixing 20 g / L of cool-sensation microcapsule A, 20 g / L of cool-sensation microcapsule B, and 4 g / L of crosslinking agent evenly, dip-rolling finishing is carried out on the blank non-woven fabric, and drying is performed at 130 °C to obtain the cool-sensation non-woven fabric. The dip-rolling process is two-dip two-roll, and the pick-up rate is 100%.

[0056] Comparative Example 4

[0057] Preparation and finishing of the phase change temperature-regulating coating finishing agent: 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water are stirred evenly in proportion to prepare the coating finishing agent, which is respectively coated on both sides of the non-woven fabric, and the dry weight of single-sided coating is 10 g / m 2 , and the drying temperature is 100 °C. The temperature-regulating non-woven fabric is thus obtained.

[0058] Comparative Example 5

[0059] Preparation of cool-sensation microcapsule A: S1. Dissolve 30 g of xylitol, 20 g of water, and 10 g of ethanol, add 2.1 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and at a rotation speed of 500 rpm, mix 15 g of acrylonitrile, 15 g of butyl acrylate, 300 g of paraffin oil, and 2.1 g of emulsifier S-80 to obtain the oil phase; S3. Under N2 protection, quickly add the oil phase to the aqueous phase, homogenize at 13000 rpm for 20 min, then slowly drop 0.09 g of azobisisobutyronitrile, react at 72 °C for 8 h, and filter the reaction product and wash it clean.

[0060] Preparation of cool-sensation microcapsule B: S1. Weigh 30 g of xylitol, 20 g of water, and 10 g of ethanol and dissolve them, add 0.54 g of emulsifier T-80 and stir to obtain the aqueous phase; S2. Take another container, and at a rotation speed of 500 rpm, mix 6 g of acrylonitrile, 6 g of butyl acrylate, 300 g of paraffin oil, and 0.54 g of emulsifier S-80 to obtain the oil phase; S3. Under N2 protection, quickly add the oil phase to the aqueous phase, homogenize at 6000 rpm for 20 min, then slowly drop 0.036 g of azobisisobutyronitrile, react at 70 °C for 7 h, and filter the reaction product and wash it clean.

[0061] Dip-rolling finishing of cool-sensation microcapsules:

[0062] After mixing 0 g / L of cool-sensation microcapsule A, 40 g / L of cool-sensation microcapsule B, and 4 g / L of crosslinking agent evenly, dip-rolling finishing is carried out on the non-woven fabric coated with phase change microcapsules, and drying is performed at 130 °C to obtain the long-lasting cool-sensation non-woven fabric. The dip-rolling process is two-dip two-roll, and the pick-up rate is 100%.

[0063] Performance testing and results:

[0064] 1. Test the Qmax value of the non-woven fabric after pressure testing.

[0065] The specific non-woven fabric pressure test conditions are as follows: Take 30 cm × 30 cm sample fabrics prepared from the formulations of each example and comparative example, and attach them to the rubber roller of the padding mangle with tape. Under a pressure of 0.2 Mpa and a linear speed of 40 m / min, treat them for 0 min, 30 min, 60 min, 120 min, and 240 min respectively, and then test their Qmax values. Test according to GB / T35263-2017 "Testing and Evaluation of the Instantaneous Cooling Feeling Performance of Textiles in Contact". The test results are shown in Table 1 below. The instantaneous cooling feeling performance is characterized by Qmax. When Qmax ≥ 0.15, it indicates that the fabric has the instantaneous cooling feeling performance.

[0066] Table 1 Cooling feeling test results (Qmax) after non-woven fabric pressure test

[0067]

[0068] It can be seen from Example 1 and Comparative Example 4 that the cooling padding finishing can further improve the cooling value on the basis of the phase change coating finishing; it can be seen from Example 1, 2, 3 and Comparative Example 1, 2 that when non-woven fabrics are finished with two different core-shell ratio cooling microcapsules and subjected to pressure treatment for a certain period of time, the cooling value is higher than that of non-woven fabrics finished with microcapsules of a single core-shell ratio; it can be seen from the comparison between Comparative Example 1 and 2 that adding cooling microcapsules with a higher core-shell ratio results in a higher initial cooling feeling, but after 240 min of pressure treatment, the final cooling values of the two are relatively close, but both are lower than those of Example 1, 2, 3; it can be seen from the comparison between Comparative Example 3 and Comparative Example 5 that without the phase change temperature regulation coating, for Comparative Example 5 with a single core-shell ratio, the cooling value is very low after 120 min of pressure treatment.

[0069] 2. Test the Qmax value of the non-woven fabric after friction test

[0070] The specific non-woven fabric friction test method is as follows: Take a 30 cm × 30 cm steel plate (density 7.85 g / cm 3 , thickness 1 mm) and a 30 cm × 30 cm sandpaper. Fix the back of the sandpaper to one side of the steel plate with glue, and then place it face down in the middle of an 80 × 80 cm tempered glass plate with a smooth surface. Fix the upper surface of the steel plate with transparent tape to prevent it from slipping in the direction of the sample fabric movement in the following experiment. During the test, place the 30 cm × 30 cm sample fabrics of the examples and comparative examples completely under the sandpaper. Slowly pull the sample fabric until it is completely removed, which is recorded as 1 friction test. Test 0 times, 5 times, 10 times, and 20 times respectively, and then test their Qmax values according to GB / T35263-2017 "Testing and Evaluation of the Instantaneous Cooling Feeling Performance of Textiles in Contact", as shown in Table 2.

[0071] Table 2 Cool feeling test results (Qmax) after friction test of non-woven fabric

[0072]

[0073] It can be seen from the cool feeling value test results after the friction test of Comparative Example 4 that the cool feeling value of the non-woven fabric coated only with the phase change temperature-regulating coating does not change much. This is because even if the paraffin phase change microcapsules leak after being rubbed and broken, they can still play the role of phase change temperature regulation. It can be seen from Examples 1, 2, 3 and Comparative Examples 1, 2, 3 after the friction test that the cool feeling value loss is obvious after the cool feeling microcapsules are rubbed and broken. Among them, Comparative Example 2 with a single wall material ratio has the largest loss, and Comparative Example 1 has a low initial cool feeling value. It can be seen from Examples 1 and Comparative Examples 1 and 2 that after the non-woven fabric is finished with cool feeling microcapsules with two different core-wall ratios, the cool feeling value is higher than that of the non-woven fabric finished with microcapsules with a single core-wall ratio. It can be seen from the comparison between Comparative Examples 1 and 2 that adding cool feeling microcapsules with a higher core-wall ratio has a higher initial cool feeling. After friction treatment, the final cool feeling values of both are relatively close, but both are lower than those of Examples 1, 2, and 3.

[0074] It can be seen from the comparison of the cool feeling value test results after the non-woven fabric is subjected to pressure and friction tests that the scheme of finishing the phase change microcapsule coating and the cool feeling microcapsule padding layer successively improves the cool feeling effect of the non-woven fabric. By using cool feeling microcapsules with different core-wall ratios in combination, the persistence of the cool feeling is improved.

Claims

1. A preparation method of continuously cool-sensing non-woven fabric, characterized in that The preparation method first finishes the phase change temperature regulating coating on both surfaces of the non-woven fabric, and then finishes the cool feeling microcapsules. The specific steps are as follows: 1) Preparation and finishing of the phase change temperature regulating coating finishing agent: 50 parts of phase change microcapsules, 2 parts of expandable microspheres, 30 parts of acrylate microgel emulsion, 4 parts of thickener, and 14 parts of water are stirred evenly in proportion to prepare the coating finishing agent, which is coated on both sides of the non-woven fabric and then dried. 2) Padding finishing of the cool feeling microcapsules: 10 - 40 g / L of cool feeling microcapsule A, 10 - 40 g / L of cool feeling microcapsule B, 3 - 5 g / L of cross-linking agent, and the balance of water are mixed evenly according to the formula, and are finished on the non-woven fabric coated with phase change microcapsules by the padding process and dried at 130 °C. The preparation method of the cool feeling microcapsule A is as follows: S1: Weigh the core material xylitol, dissolve it in water and ethanol, add emulsifier T-80 and stir to obtain the aqueous phase. S2: Take another container, mix the monomer acrylonitrile and butyl acrylate with paraffin oil and emulsifier S-80 at a rotation speed of 500 rpm to obtain the oil phase. S3: Under N2 protection, quickly add the oil phase to the aqueous phase, homogenize at 12000 - 14000 rpm for 15 - 20 min, then slowly dropwise add the initiator, react at 70 - 80 °C for 6 - 8 h, filter the reaction product by suction and wash it clean. The mass ratio of the core material xylitol, ethanol, water to the wall material reaction monomers acrylonitrile and butyl acrylate is 3 - 1:1; the mass ratio of acrylonitrile to butyl acrylate is 1:1; the emulsifier accounts for 12 - 14% of the monomers; the initiator is azobisisobutyronitrile, and the addition amount of the initiator is 0.3% - 0.5% of the monomers; the mass ratio of water to ethanol is 2:1, and the proportion of xylitol in the mixture of xylitol, water and ethanol is 50 - 60%; the ratio of paraffin oil to the mixture of xylitol, water and ethanol is 5:1; the mass ratio of T-80 to S-80 is 1:

1. The preparation method of the cool feeling microcapsule B is as follows: S1: Weigh the core material xylitol, dissolve it in water and ethanol, add emulsifier T-80 and stir to obtain the aqueous phase. S2: Take another container, mix the monomer acrylonitrile and butyl acrylate with paraffin oil and emulsifier S-80 at a rotation speed of 500 rpm to obtain the oil phase. S3: Under N2 protection, quickly add the oil phase to the aqueous phase, homogenize at 6000 - 8000 rpm for 15 - 20 min, then slowly dropwise add the initiator, react at 70 - 80 °C for 6 - 8 h, filter the reaction product by suction and wash it clean. The mass ratio of the core material xylitol, ethanol, water to the wall material reaction monomers is 6 - 4:1; the mass ratio of acrylonitrile to butyl acrylate is 1:1; the emulsifier accounts for 8 - 10% of the monomers; the initiator is azobisisobutyronitrile, and the addition amount of the initiator is 0.3% - 0.5% of the monomers; the ratio of paraffin oil to the mixture of xylitol, water and ethanol is 5:1; the mass ratio of T-80 to S-80 is 1:1; the mass ratio of water to ethanol is 2:1, and the proportion of xylitol in the mixture of xylitol, water and ethanol is 50 - 60%.

2. The preparation method of a continuously cool-sensing non-woven fabric according to claim 1, characterized in that Step 1) The mid-coating finishing agent is coated on one side of the non-woven fabric with a dry weight of 10-20 g / m 2 , and the drying temperature is 100 °C.

3. The preparation method of a continuously cool-feeling non-woven fabric according to claim 1, characterized in that In step 2), the padding process is two-bath two-roll padding, and the liquor pickup rate is 100%.

4. The preparation method of a continuously cool-sensation non-woven fabric according to claim 1, characterized in that The non-woven fabric described is a spunlace viscose non-woven fabric with a grammage of 40 g / m 2 .

5. The preparation method of a continuously cool-sensing non-woven fabric as described in claim 1, characterized in that The core material of the phase change microcapsules is paraffin wax, the particle size of the expandable microspheres is 3 - 5 microns, the core material is one of isobutane and neopentane, the solid content of the acrylate microgel emulsion is 40 - 50%, the thickener is one of polyacrylic acid types and polyurethane types, and the crosslinking agent is a water-based blocked isocyanate crosslinking agent.

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