Textile auxiliary agent for improving heat insulation property of fabric and preparation method of textile auxiliary agent

Abstract

The invention relates to the field of textile auxiliary agents, in particular to a textile auxiliary agent for improving the heat insulation property of fabric and a preparation method and application thereof, and the textile auxiliary agent is prepared from the following raw materials in parts by weight: 35-45 parts of modified polyurethane, 40-60 parts of water, 1-3 parts of filler and 2-6 parts of ultraviolet light absorber. The textile auxiliary agent prepared by the invention has good ultraviolet resistance, heat insulation property and antistatic property.

Description

Technical Field

[0001] The invention relates to the field of textile auxiliaries, and in particular to a textile auxiliaries for improving the thermal insulation of fabrics and a preparation method thereof. Background Art

[0002] Textiles are usually made of natural fibers such as cotton, linen, wool, or chemical fibers such as polyester, polypropylene, and polyamide. The product quality and added value of textiles are generally determined by the properties of the fiber raw materials themselves. If you want to improve the quality of textiles and make them have higher added value, such as waterproof, antibacterial, antistatic, flame retardant, heat insulating, etc., it is often necessary to use textile auxiliaries to treat the surface of textiles. At the same time, due to the increasingly diversified and personalized demand of consumers for textiles, various textile auxiliaries with special functions are gradually developed and applied.

[0003] Patent CN115162005B discloses a textile auxiliary agent for improving the hardness of fabrics, which is made of the following raw materials in parts by weight: 25-35 parts of water-based polyester resin, 75-90 parts of water, 1-3 parts of dispersant, 1-5 parts of isocyanate, and 1-3 parts of filling particles; the preparation method is: weigh the water-based polyester resin and water, mix and stir evenly, then add the filling particles and dispersant, mix and stir evenly, and finally add isocyanate, stir evenly to obtain a finished product; the textile auxiliary agent should be applied to the surface of the textile to effectively improve the hardness of the finished fabric, but polyester is prone to generate static electricity, which may cause the fabric to absorb dust, affecting its appearance and cleanliness.

[0004] Patent CN106544870B discloses a functional textile auxiliary agent, which uses composite nano silver bromide / blue tungsten oxide as an antibacterial and heat-insulating medium and silicone emulsion as a hydrophobic component of a textile nano finishing agent. The functional textile auxiliary agent of this invention has the functions of antibacterial and deodorizing, heat-insulating and warm-keeping, and hydrophobic and self-cleaning. However, silver bromide is easy to change color under light or heating conditions, which will affect the appearance of the fabric.

[0005] Therefore, there is an urgent need for a textile auxiliary agent with good antistatic properties and stable properties. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to obtain a textile auxiliary agent which has good antistatic properties, stable properties and can improve the thermal insulation of fabrics.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] On one hand, the present invention provides a textile auxiliary agent for improving the thermal insulation of fabrics, which comprises the following raw materials in parts by weight: 35-45 parts of modified polyurethane, 40-60 parts of water, 1-3 parts of filler, and 2-6 parts of ultraviolet absorber.

[0009] In some embodiments, the method for preparing the modified polyurethane comprises the following steps:

[0010] (1) adding polyvinyl alcohol to thionyl chloride, adding phosphorus pentoxide at 10-30° C., then heating to 70-80° C. for reaction for 4-6 hours, adding acrylic acid for further reaction for 5-6 hours, and drying to obtain polyvinyl alcohol containing double bonds; reacting polyvinyl alcohol containing double bonds, vinyl silicone oil and potassium persulfate at 70-80° C. for 1-2 hours to obtain a polymer;

[0011] (2) Add polyether polyol, polymer and polyisocyanate to a solvent, react at 60-70°C for 3-4h, add dimethylol propionic acid and a catalyst, react at 75-85°C for 2.5-3.5h, add a chain extender, react at 90-100°C for 1.5-2.5h, then add a neutralizer, react at 40-50°C for 40-60min, cool to 25-30°C, add deionized water for emulsification, rotate at 700-800rpm, emulsify for 1-2h, remove the solvent by reduced pressure distillation, and obtain a modified polyurethane.

[0012] Preferably, the mass ratio of the polyether polyol to the polyisocyanate is (0.7-0.9):1.

[0013] Polyurethane can be used as a textile auxiliary to increase the antistatic property of fabrics, but as a macromolecular substance, polyurethane is difficult to combine with cotton fabrics, resulting in poor antistatic property. The present invention prepares a polymer by loading phosphate groups and double bonds on polyvinyl alcohol and then reacting with vinyl silicone oil, and then modifying the polyurethane with the polymer, so that the modified polyurethane has good antistatic property, flame retardant and heat insulation property as a textile auxiliary. The possible reason is that multiple phosphate groups are added to the polymer, which can not only increase the antistatic property of cotton fabrics, but also effectively reduce the thermal conductivity of cotton fabrics and improve the heat insulation of cotton fabrics. At the same time, it can reduce the hydrogen bonding effect between cotton fabric molecules, make the textile auxiliary easier to combine with cotton fabrics, increase the compatibility of the two, and further enhance the antistatic property and heat insulation effect of cotton fabrics; in addition, vinyl silicone oil can improve the sticking problem during processing, improve processability, and has a certain antibacterial effect.

[0014] In some embodiments, the mass ratio of the polyvinyl alcohol to phosphorus pentoxide is 1:(0.1-0.4).

[0015] In some embodiments, the mass ratio of polyvinyl alcohol to acrylic acid is 1:(0.1-0.5).

[0016] In some embodiments, the mass ratio of the polyvinyl alcohol containing double bonds to the vinyl silicone oil is 1:(0.2-0.7).

[0017] In some embodiments, the mass ratio of the polymer to the polyisocyanate in step (3) is (0.1-0.4):1.

[0018] In some embodiments, the polyisocyanate is L-lysine triisocyanate.

[0019] The present invention limits the mass ratio of polyvinyl alcohol to phosphorus pentoxide so that the polyvinyl alcohol is loaded with a certain amount of phosphate groups while retaining hydroxyl groups, and further limits the mass ratio of polyvinyl alcohol to acrylic acid so that the polyvinyl alcohol is loaded with double bonds and then reacts with vinyl silicone oil, and by limiting the mass ratio of vinyl silicone oil to polyvinyl alcohol containing double bonds, the processability of cotton fabrics is increased while the softness of the cotton fabrics is not reduced; and by limiting the mass ratio of polymer to polyisocyanate, the antistatic property of polyurethane is improved while the weather resistance of cotton fabrics is not reduced.

[0020] In some embodiments, the preparation method of the filler comprises the following steps: adding ball-milled cesium tungsten oxide, silane coupling agent, 6-chloro-1-hexanol, and sodium bicarbonate to DMF under nitrogen protection, reacting at 50-60° C. for 10-12 hours, then adding sodium N-methyltaurate to react at 75-85° C. for 5-7 hours, and drying to obtain the filler.

[0021] Preferably, the silane coupling agent is γ-aminopropyltriethoxysilane.

[0022] Cesium tungsten oxide can be used as a filler for textile auxiliaries to increase the heat insulation and UV resistance of cotton fabrics, but it is easy to agglomerate, which may cause uneven distribution on cotton fabrics, resulting in gaps at the interface between textile auxiliaries and cotton fibers, and easy moisture absorption and bacteria. The present invention increases the dispersibility and heat insulation and UV resistance of cesium tungsten oxide by grafting sulfonate groups and alkyl segments on cesium tungsten oxide. The possible reason is that the hydroxyl groups of the alkane chain have good compatibility with cotton fibers. With the cooperation of the alkane chain segments, cesium tungsten oxide can be tightly "wrapped" on the surface of cotton fibers, and hydrogen bonds can be formed with ultraviolet absorbers to further enhance the heat insulation and UV resistance effects.

[0023] In some embodiments, the mass ratio of the cesium tungsten oxide to 6-chloro-1-hexanol is 1:(0.4-0.8).

[0024] In some embodiments, the mass ratio of 6-chloro-1-hexanol to sodium N-methyltaurate is 1:(1.2-1.5).

[0025] The present invention limits the mass ratio of cesium tungsten oxide to 6-chloro-1-hexanol so that cesium tungsten oxide is loaded with certain chlorine atoms to react with sodium N-methyltaurate to enhance the dispersibility of cesium tungsten oxide. At the same time, the mass ratio of sodium N-methyltaurate to 6-chloro-1-hexanol is limited in advance, so that a synergistic effect can be produced with an ultraviolet absorber, thereby further improving the heat insulation and anti-ultraviolet effects, and reducing the residual chlorine element, thereby reducing the damage to human health.

[0026] In some embodiments, the ultraviolet absorber is any one of 2-hydroxy-4-acryloxybenzophenone, 2-hydroxy-4-allyloxybenzophenone or 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

[0027] Preferably, the ultraviolet absorber is 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

[0028] The second aspect of the present invention provides a method for preparing a textile auxiliary agent for improving the thermal insulation of fabrics, comprising the following steps: stirring modified polyurethane, water, filler and ultraviolet absorber at 40-50°C for 30-50min to obtain.

[0029] The third aspect of the present invention provides an application of a textile auxiliary agent for improving the thermal insulation of a fabric, wherein the cotton fabric is added to the textile auxiliary agent for two immersions and two rollings, the mass ratio of the cotton fabric to the textile auxiliary agent is 1: (15-20), each immersion time is 60-70 minutes, the immersion temperature is 35-40°C, the rolling speed is 2-4 cm / s, and the pressure is 3-5 kg / cm 2 The rolling rate is 80-90% and the drying temperature is 30-40℃.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The present invention prepares a textile auxiliary agent by modifying polyurethane and other auxiliary agents, which has good antistatic properties, UV resistance and heat insulation properties.

[0032] (2) The present invention prepares a polymer by loading phosphate groups and double bonds on polyvinyl alcohol and then reacting with vinyl silicone oil, and then using the polymer to modify polyurethane. Multiple phosphate groups are added to the polymer, which can not only increase the antistatic property of cotton fabrics, but also effectively reduce the thermal conductivity of cotton fabrics, improve the thermal insulation of cotton fabrics, and at the same time reduce the hydrogen bonding effect between cotton fabric molecules, making it easier for textile auxiliaries to combine with cotton fabrics, increasing the compatibility of the two, and further enhancing the antistatic property and thermal insulation effect of cotton fabrics.

[0033] (3) The present invention increases the compatibility of cesium tungsten oxide with cotton fiber by grafting sulfonate and alkyl chain segments on cesium tungsten oxide. With the cooperation of alkane chain segments, cesium tungsten oxide can be tightly "wrapped" on the surface of cotton fiber, and hydrogen bonds can be formed with ultraviolet absorbers to further enhance the heat insulation and anti-ultraviolet effects. DETAILED DESCRIPTION

[0034] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0035] In the following examples and comparative examples, the compounds and related reagents used can be purchased from the market, among which vinyl silicone oil was purchased from Jining Fangyu Chemical Co., Ltd. with a viscosity of 500CS (25°C); polyvinyl alcohol was purchased from Shanghai Yien Chemical Technology Co., Ltd. with Mw=31000; polyether polyol was purchased from Guangzhou Qixu Chemical Co., Ltd. with model PPG-1000.

[0036] Preparation Example 1

[0037] The preparation method of modified polyurethane-1 comprises the following steps:

[0038] (1) adding 10 g of polyvinyl alcohol to 300 ml of thionyl chloride, adding 2 g of phosphorus pentoxide at 20° C., then heating to 75° C. for reaction for 5 h, adding 3 g of acrylic acid for further reaction for 5.5 h, and drying to obtain polyvinyl alcohol containing double bonds; reacting 10 g of polyvinyl alcohol containing double bonds, 5 g of vinyl silicone oil and 0.05 g of potassium persulfate at 75° C. for 1.5 h to obtain a polymer;

[0039] (2) 8 g of polyether polyol, 2 g of polymer, and 10 g of L-lysine triisocyanate were added to 30 g of acetone, and the mixture was reacted at 65 °C for 3.5 h. 0.6 g of dihydroxymethylpropionic acid and 0.02 g of dibutyltin dilaurate were added, and the mixture was reacted at 80 °C for 3 h. 0.7 g of 1,4-butanediol was added, and the mixture was reacted at 95 °C for 2 h. Then, 0.2 g of triethylamine was added, and the mixture was reacted at 45 °C for 50 min. The mixture was cooled to 28 °C, and 10 g of deionized water was added for emulsification at a speed of 750 rpm for 1.5 h. Acetone was removed by vacuum distillation to obtain modified polyurethane-1.

[0040] Preparation Example 2

[0041] The preparation method of modified polyurethane-2 is the same as that of Preparation Example 1, except that the amount of acrylic acid added is 7 g.

[0042] Preparation Example 3

[0043] The preparation method of modified polyurethane-3 is the same as that of Preparation Example 1, except that the amount of vinyl silicone oil added is 10 g.

[0044] Preparation Example 4

[0045] The preparation method of modified polyurethane-4 is the same as that of Preparation Example 1, except that the amount of polymer added is 6 g.

[0046] Preparation Example 5

[0047] The preparation method of filler-1 comprises the following steps: under nitrogen protection, 10 g of ball-milled cesium tungsten oxide, 1 g of γ-aminopropyltriethoxysilane, 6 g of 6-chloro-1-hexanol, and 0.5 g of sodium bicarbonate are added to 50 ml of DMF, reacted at 55° C. for 11 hours, then 1.8 g of sodium N-methyltaurate is added, reacted at 80° C. for 6 hours, and dried to obtain filler-1.

[0048] Preparation Example 6

[0049] The preparation method of filler-2 is the same as that of Preparation Example 5, except that the amount of 6-chloro-1-hexanol added is 9 g.

[0050] Preparation Example 7

[0051] The preparation method of polyurethane comprises the following steps: adding 8g of polyether polyol and 10g of L-lysine triisocyanate to 30g of acetone, reacting at 65°C for 3.5h, adding 0.6g of dihydroxymethyl propionic acid and 0.02g of dibutyltin dilaurate, reacting at 80°C for 3h, adding 0.7g of 1,4-butanediol, reacting at 95°C for 2h, then adding 0.2g of triethylamine, reacting at 45°C for 50min, cooling to 28°C, adding 10g of deionized water for emulsification, rotating speed of 750rpm, emulsifying time of 1.5h, removing acetone by reduced pressure distillation, and obtaining polyurethane.

[0052] Example 1

[0053] A textile auxiliary agent for improving the thermal insulation of fabrics comprises the following raw materials, measured in parts by weight: 40 parts of modified polyurethane-1, 50 parts of water, 2 parts of filler-1, and 4 parts of 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

[0054] The preparation method of the textile auxiliary agent for improving the thermal insulation of fabric in this embodiment comprises the following steps: stirring modified polyurethane-1, water, filler-1 and 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol) at 45°C for 40 minutes to obtain the obtained product.

[0055] Example 2

[0056] A textile auxiliary agent for improving the thermal insulation of fabrics comprises the following raw materials, measured in parts by weight: 35 parts of modified polyurethane-1, 40 parts of water, 1 part of filler-1, and 2 parts of 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

[0057] The preparation method of the textile auxiliary agent for improving the thermal insulation of fabric in this embodiment comprises the following steps: stirring modified polyurethane-1, water, filler-1 and 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol) at 40°C for 50 minutes to obtain the obtained product.

[0058] Example 3

[0059] A textile auxiliary agent for improving the thermal insulation of fabrics comprises the following raw materials, measured in parts by weight: 45 parts of modified polyurethane-1, 60 parts of water, 3 parts of filler-1, and 6 parts of 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

[0060] The preparation method of the textile auxiliary agent for improving the thermal insulation of fabric in this embodiment comprises the following steps: stirring modified polyurethane-1, water, filler-1 and 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol) at 50°C for 30 minutes to obtain the obtained product.

[0061] Example 4

[0062] A textile auxiliary agent for improving the thermal insulation of fabrics and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that an equal amount of modified polyurethane-1 is replaced by modified polyurethane-2.

[0063] Example 5

[0064] A textile auxiliary agent for improving the thermal insulation of fabrics and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that an equal amount of modified polyurethane-1 is replaced by modified polyurethane-3.

[0065] Example 6

[0066] A textile auxiliary agent for improving the thermal insulation of fabrics and a preparation method thereof. The specific implementation manner is the same as that of Example 1, except that an equal amount of modified polyurethane-1 is replaced by modified polyurethane-4.

[0067] Example 7

[0068] A textile auxiliary agent for improving the thermal insulation of fabric and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of filler-1 is replaced by filler-2.

[0069] Example 8

[0070] A textile auxiliary agent for improving the thermal insulation of fabrics and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of filler-1 is replaced by cesium tungsten oxide.

[0071] Comparative Example 1

[0072] A textile auxiliary agent for improving the thermal insulation of fabrics and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified polyurethane-1 is replaced by polyurethane.

[0073] Performance Testing

[0074] The cotton fabric was added to the textile auxiliaries obtained in the above embodiments and comparative examples for two immersions and two rollings. The mass ratio of the cotton fabric to the textile auxiliaries was 1:18. The soaking time was 65 min each time, the soaking temperature was 37 ° C, the squeezing speed was 3 cm / s, and the pressure was 4 kg / cm 2 , the rolling rate is 88%, the drying temperature is 35°C, and the cotton fabrics treated with the textile auxiliaries obtained in each embodiment and comparative example are used as samples to carry out the following tests:

[0075] 1. Antistatic

[0076] Refer to "GB / T 12703.4-2010 Evaluation of electrostatic properties of textiles Part 4: Resistivity" to test the resistivity of the sample. The lower the resistivity, the better the antistatic performance.

[0077] 2. Thermal insulation

[0078] The sample was irradiated with an infrared irradiator for 5 min, and the temperature change ΔT of the sample before and after irradiation was recorded.

[0079] 3. UV resistance

[0080] Refer to "GB / T 18830-2009 Evaluation of UV protection performance of textiles" to test the UV resistance of samples. The higher the UPF value, the better the UV resistance.

[0081] The test results are shown in Table 1:

[0082] Table 1

[0083]

[0084]

[0085] From the comparison of the experimental data of Examples 1-3 in Table 1, it can be seen that the textile auxiliary agent obtained by the present invention has good antistatic properties, heat insulation, UV resistance and antibacterial properties; compared with Example 1, it can be seen that the ratio of polyvinyl alcohol to acrylic acid is changed, resulting in a decrease in compatibility with cotton fabrics, and both antistatic and heat insulation properties are reduced; compared with Example 1, it can be seen that the ratio of polyvinyl alcohol containing double bonds to vinyl silicone oil is changed, the alkane chain segment is increased, and the antistatic property is reduced; compared with Example 1, it can be seen that the polymer The weather resistance and UV resistance decreased when the ratio with polyisocyanate was changed; by comparing Example 7 with Example 1, it can be seen that the ratio of cesium tungsten oxide to 6-chloro-1-hexanol was changed, the chlorine element increased, which may destroy the polar groups on the surface of the cotton fabric and reduce the antistatic property; by comparing Example 8 with Example 1, it can be seen that directly using cesium tungsten oxide as a filler has poor dispersibility, and both heat insulation and UV resistance are reduced; by comparing Comparative Example 1 with Example 1, it can be seen that directly using polyurethane has poor compatibility with cotton fabric and all performances are reduced.

[0086] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A textile auxiliary agent for improving the thermal insulation of fabrics, characterized in that: The invention comprises the following raw materials in parts by weight: 35-45 parts of modified polyurethane, 40-60 parts of water, 1-3 parts of filler and 2-6 parts of ultraviolet absorber.

2. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 1, characterized in that: The preparation method of the modified polyurethane comprises the following steps: (1) adding polyvinyl alcohol to thionyl chloride, adding phosphorus pentoxide at 10-30° C., then heating to 70-80° C. for reaction for 4-6 hours, adding acrylic acid for further reaction for 5-6 hours, and drying to obtain polyvinyl alcohol containing double bonds; reacting polyvinyl alcohol containing double bonds, vinyl silicone oil and potassium persulfate at 70-80° C. for 1-2 hours to obtain a polymer; (2) Add polyether polyol, polymer and polyisocyanate to a solvent, react at 60-70°C for 3-4h, add dimethylol propionic acid and a catalyst, react at 75-85°C for 2.5-3.5h, add a chain extender, react at 90-100°C for 1.5-2.5h, then add a neutralizer, react at 40-50°C for 40-60min, cool to 25-30°C, add deionized water for emulsification, rotate at 700-800rpm, emulsify for 1-2h, remove the solvent by reduced pressure distillation, and obtain a modified polyurethane.

3. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 2, characterized in that: The mass ratio of the polyvinyl alcohol to acrylic acid is 1:(0.1-0.5).

4. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 2, characterized in that: The mass ratio of the polyvinyl alcohol containing double bonds to the vinyl silicone oil is 1:(0.2-0.7).

5. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 2, characterized in that: The mass ratio of the polymer to the polyisocyanate in step (2) is (0.1-0.4):

1.

6. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 1, characterized in that: The preparation method of the filler comprises the following steps: adding ball-milled cesium tungsten oxide, a silane coupling agent and 6-chloro-1-hexanol into DMF under nitrogen protection, reacting at 50-60° C. for 10-12 hours, then adding sodium N-methyltaurate and reacting at 75-85° C. for 5-7 hours, and drying to obtain the filler.

7. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 6, characterized in that: The mass ratio of the cesium tungsten oxide to 6-chloro-1-hexanol is 1:(0.4-0.8).

8. The textile auxiliary agent for improving the thermal insulation of fabric according to claim 1, characterized in that: The ultraviolet absorber is any one of 2-hydroxy-4-acryloxybenzophenone, 2-hydroxy-4-allyloxybenzophenone or 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

9. A method for preparing a textile auxiliary agent for improving the thermal insulation of fabrics according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: stirring the modified polyurethane, water, filler and ultraviolet absorber at 40-50° C. for 30-50 minutes to obtain the obtained product.

10. Use of a textile auxiliary for improving the thermal insulation of fabrics according to any one of claims 1 to 8 or a textile auxiliary obtained by the preparation method according to claim 9, characterized in that: The cotton fabric is added to the textile auxiliary agent for two dipping and two rolling, the mass ratio of the cotton fabric to the textile auxiliary agent is 1: (15-20), the dipping time is 60-70 minutes each time, the dipping temperature is 35-40° C., the squeezing speed is 2-4 cm / s, and the pressure is 3-5 kg / cm 2 The rolling rate is 80-90% and the drying temperature is 30-40℃.

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