Hydrophilic polyurethane sponge combination material with low swelling rate, its preparation method and application

Abstract

The present invention belongs to the technical field of polyurethane, and particularly relates to a hydrophilic polyurethane sponge composite material with a low swelling rate, its preparation method and application. The hydrophilic polyurethane sponge composite material with a low swelling rate is made from component A and component B in a mass ratio of 100:(50-55). Among them, component A includes the following raw materials: a foaming agent, wollastonite powder, an antibacterial agent, emulsifying wax and a polyether-type crosslinking agent; component B includes a polyether ester polyol and toluene diisocyanate; the polyether-type crosslinking agent is prepared by ring-opening polymerization reaction of EO with triethanolamine as the initiator; the polyether ester polyol is prepared by an esterification reaction with polyethylene glycol, diethylene glycol, trimethylolpropane and adipic acid as raw materials. The hydrophilic polyurethane sponge prepared by using this composite material not only has good hydrophilicity, high porosity, fine cell structure, but also has a low swelling rate and excellent mechanical properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethanes, and particularly relates to a hydrophilic polyurethane sponge composition with a low swelling rate, and a preparation method and application thereof. Background Art

[0002] Hydrophilic polyurethane foam materials are a widely used material for cotton pads for makeup because they have excellent absorption properties, biocompatibility, no allergic reactions and teratogenic effects; at the same time, they also have good elasticity and toughness, and excellent processing performance.

[0003] Currently, the preparation of hydrophilic polyurethane foam materials mainly involves introducing hydrophilic structures into the molecular chain, such as ethylene oxide (EO) linkages, to improve the hydrophilicity of the materials. The production methods are divided into one-step method and two-step method. Among them, the one-step method refers to a method of mixing, pouring, and reacting raw materials such as polyols, surfactants, catalysts, blowing agents, and polyisocyanates at one time; the two-step method is to first react isocyanate with polyether polyol to generate a prepolymer, and then let the prepolymer react with other components to obtain a foam. However, the hydrophilic foam materials prepared by these two methods all have problems such as poor strength, poor open-cell property, and high swelling rate, and can no longer meet the new requirements of people for cotton pads for makeup.

[0004] Chinese Patent CN113861370A discloses a polyurethane composition for cotton pads for makeup. This composition consists of component A and component B. Among them, component A is made of wollastonite powder, blowing agent, chain extender, emulsifying wax, open-cell agent, and color paste; component B is made of hydrophilic polyether polyol A, hydrophilic polyether polyol B, crosslinking agent polyether, and T 80. The cotton pads for makeup made with this composition not only have good resilience in water, good hydrophilicity, but also have delicate cell structure and excellent mechanical properties. However, this application does not study the open-cell property and swelling rate of the product.

[0005] Therefore, it is necessary to develop a hydrophilic polyurethane sponge composition with a low swelling rate and good open-cell property to meet the higher requirements for material properties in fields such as cotton pads for makeup. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a hydrophilic polyurethane sponge composition with a low swelling rate, which can be applied to the preparation of cotton pads for makeup. The cotton pads for makeup prepared not only have good hydrophilicity, high open-cell rate, delicate cell structure, but also have low swelling rate and excellent mechanical properties.

[0007] Another purpose of the present invention is to provide a preparation method and application of a hydrophilic polyurethane sponge composition with a low swelling rate.

[0008] The technical solution adopted by the present invention is as follows:

[0009] The hydrophilic polyurethane sponge composite material with low swelling rate is made of component A and component B in a mass ratio of 100: (50 - 55). Among them, component A includes the following raw materials in parts by mass:

[0010] Blowing agent: 50 - 55 parts;

[0011] Wollastonite powder: 40 - 45 parts;

[0012] Antibacterial agent: 0.5 - 1 part;

[0013] Emulsified wax: 1 - 3 parts;

[0014] Polyether crosslinking agent: 1 - 3 parts;

[0015] Component B includes the following raw materials in parts by mass:

[0016] Polyether ester polyol: 100 parts;

[0017] Toluene diisocyanate: 35 - 40 parts;

[0018] The polyether crosslinking agent is prepared by ring-opening polymerization reaction of triethanolamine as the initiator with EO;

[0019] The polyether ester polyol is prepared by esterification reaction with polyethylene glycol, diethylene glycol, trimethylolpropane and adipic acid as raw materials;

[0020] The toluene diisocyanate is a mixture of T65 and T100.

[0021] The blowing agent is water.

[0022] The fineness of the wollastonite powder is 400 - 800 mesh.

[0023] The antibacterial agent is chitosan quaternary ammonium salt.

[0024] The emulsified wax is a non-ionic emulsifying matrix, preferably 1000NI of BASF in Germany.

[0025] The polyether crosslinking agent has a functionality of 3 and a number average molecular weight of 300 - 400; its preparation method includes the following steps:

[0026] 1) Add triethanolamine and KOH to a high-pressure reaction kettle, replace with nitrogen three times and then evacuate to a pressure of -0.095 to -0.1 MPa. Heat up to 170 - 180 °C under vacuum conditions, keep warm for 2 - 3 h, then cool down to 120 - 125 °C, continuously introduce EO, and control the pressure in the kettle < 0.5 MPa. After introduction, keep warm at 120 °C and continue the reaction until the system shows negative pressure, then cool down and discharge to obtain the crude crosslinking agent;

[0027] (2) Add the crude crosslinking agent into a container equipped with a stirrer and a thermometer. After adding distilled water, heat up to 70 - 80 °C and stir for 1 - 1.5 h; then add phosphoric acid and continue stirring for 1 - 1.5 h; next, add the refining agent magnesium silicate and stir for 1 - 1.5 h. Then, carry out vacuum dehydration at 110 - 120 °C until the water content ≤ 0.03 wt.%, and then filter to obtain the polyether - type crosslinking agent.

[0028] The hydroxyl value of the polyether ester polyol is 56 - 112 mgKOH / g; its preparation method includes the following steps:

[0029] Add polyethylene glycol, diethylene glycol, trimethylolpropane, and adipic acid into a four - necked flask equipped with stirring, temperature control, and a condenser tube. Stir evenly. Under the protection of nitrogen, heat up to 220 - 240 °C for esterification reaction. Maintain the reaction system temperature at 220 - 240 °C, and carry out vacuum dehydration on the system. During the reaction process, monitor the acid value and hydroxyl value of the system. When the acid value (≤ 0.5 mgKOH / g) and the hydroxyl value reach the theoretical values, terminate the reaction. Cool down to 100 °C and discharge the material to obtain the polyether ester polyol;

[0030] Among them, the hydroxyl value of the polyethylene glycol is 278 - 282 mgKOH / g, and the functionality is 2.

[0031] The toluene diisocyanate is a mixture of T65 and T100, and their mass ratio is (1 - 2):(2 - 1).

[0032] The preparation method of the low - swelling - rate hydrophilic polyurethane sponge composite material includes the following steps:

[0033] (1) Preparation of component A: Put the blowing agent, wollastonite powder, antibacterial agent, emulsifying wax, and polyether - type crosslinking agent into a reaction kettle, and stir at room temperature with a rotation speed of 40 - 50 r / min for 20 - 30 min to obtain component A;

[0034] (2) Preparation of component B: Put the polyether ester polyol into a reaction kettle, heat up to 110 - 120 °C, carry out dehydration under vacuum conditions for 2 - 3 h, then cool down to 30 - 40 °C, add toluene diisocyanate, heat up to 75 - 80 °C, keep the temperature for reaction for 2 - 3 h, take a sample for detection. When the measured - NCO content is 6.0 - 10.5 wt.%, cool down and discharge the material, and seal it for storage to obtain component B;

[0035] (3) Mix component A and component B evenly according to the mass ratio, inject them into a mold, open the mold and cure after 3 - 5 min to obtain the low - swelling - rate hydrophilic polyurethane sponge composite material.

[0036] The application of the low - swelling - rate hydrophilic polyurethane sponge composite material is used for preparing cotton pads for makeup.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] (1) The present invention uses oligomeric polyethylene glycol, triethanolamine, and adipic acid as raw materials, and through esterification-polycondensation reaction, a new polyether ester polyol is successfully prepared. The molecular chain of this polyether ester polyol contains both ester bond segments and ethylene oxide (EO) segments. The polyurethane sponge blend prepared with this polyether ester polyol, benefiting from the high strength of the ester bond and the good hydrophilicity of the ethylene oxide (EO) segments, not only exhibits excellent hydrophilic properties, high open-cell rate, and delicate cell structure, but also has a low swelling rate and excellent mechanical properties;

[0039] (2) The molecular chain of the polyether crosslinking agent described in the present invention contains ethylene oxide (EO) segments. The polyurethane sponge blend prepared with it not only has good hydrophilic properties but also excellent mechanical properties;

[0040] (3) By selecting a mixture of toluene diisocyanate T65 and T100, the present invention effectively improves the rebound performance of the polyurethane sponge blend products on the basis of ensuring that the performance indicators of the polyurethane sponge blend products meet the standards;

[0041] (3) The preparation method of the present invention requires fewer types of raw materials, has a simple process flow, and high production efficiency. Detailed Embodiments

[0042] The present invention will be further described below in conjunction with embodiments, but it does not limit the implementation of the present invention.

[0043] Unless otherwise specified, the raw materials used in the examples and comparative examples are all conventional commercially available raw materials, and the process methods used in the examples and comparative examples are all conventional methods in the art unless otherwise specified.

[0044] Some of the raw materials used in the examples and comparative examples are described as follows:

[0045] The fineness of the wollastonite powder described is 600 ± 200 mesh.

[0046] Example 1

[0047] The low-swelling-rate hydrophilic polyurethane sponge blend is made from component A and component B in a mass ratio of 100:55. Among them, component A includes the following raw materials in parts by mass:

[0048] Water: 50 parts;

[0049] Wollastonite powder: 45 parts;

[0050] Chitosan quaternary ammonium salt: 1 part;

[0051] 1000NI: 3 parts;

[0052] Polyether crosslinking agent: 1 part;

[0053] Component B comprises raw materials in the following parts by mass:

[0054] Polyether ester polyol: 100 parts;

[0055] Toluene diisocyanate: 40 parts.

[0056] The toluene diisocyanate is a mixture of T65 and T100, and the mass ratio thereof is 1:2.

[0057] The polyether crosslinking agent has a functionality of 3 and a number average molecular weight of 300; its preparation method comprises the following steps:

[0058] 1) Add 1 mol of triethanolamine and 0.2 g of KOH to a high-pressure reactor. After purging with nitrogen three times, evacuate to a pressure of -0.095 MPa. Heat up to 170 °C under vacuum conditions, hold for 2 h, then cool down to 120 °C, continuously introduce 3.4 mol of EO, and control the pressure in the reactor < 0.5 MPa. After introduction, hold at 120 °C, continue the reaction until a negative pressure appears in the system, cool down and discharge to obtain a crude crosslinking agent;

[0059] 2) Add the crude crosslinking agent to a container equipped with a stirrer and a thermometer, add distilled water, heat up to 70 °C, and stir for 1 h; then add 0.1 g of phosphoric acid and continue stirring for 1 h; then add 0.2 g of the fining agent magnesium silicate, stir for 1 h, and then dehydrate under vacuum at 110 °C until the water content ≤ 0.03 wt.%, and then filter to obtain the polyether crosslinking agent.

[0060] The polyether ester polyol has a hydroxyl value of 56 mg KOH / g; its preparation method comprises the following steps:

[0061] Add 1302 g of polyethylene glycol (hydroxyl value 278 mg KOH / g, functionality 2), 345 g of diethylene glycol, 66 g of trimethylolpropane, and 750 g of adipic acid to a four-necked flask equipped with stirring, temperature control, and a condenser tube. Stir evenly, heat up to 220 °C under nitrogen protection for an esterification reaction, maintain the temperature of the reaction system at 240 °C, and evacuate the system to dehydrate. Monitor the acid value and hydroxyl value of the system during the reaction. When the acid value ≤ 0.5 mg KOH / g and the hydroxyl value is 56 mg KOH / g, terminate the reaction, cool down to 100 °C and discharge to obtain the polyether ester polyol;

[0062] The preparation method of the low swelling rate hydrophilic polyurethane sponge composite material comprises the following steps:

[0063] (1)Preparation of Component A: Water, wollastonite powder, quaternary ammonium salt of chitosan, 1000NI and polyether crosslinking agent were put into a reaction kettle, and stirred for 20 min at room temperature and a rotation speed of 40 r / min to obtain Component A;

[0064] (2)Preparation of Component B: Polyether ester polyol was put into a reaction kettle, heated to 110 °C, dehydrated under vacuum for 2 h, then cooled to 30 °C, toluene diisocyanate was added, heated to 75 °C, and kept warm for reaction for 2 h. Sampling and testing were carried out. When the measured -NCO content was 6.0 wt.%, it was cooled and discharged, sealed and stored to obtain Component B;

[0065] (3)Component A and Component B were mixed evenly according to the mass ratio, injected into a mold, and the mold was opened and cured after 3 min to obtain a hydrophilic polyurethane sponge combination material with a low swelling rate.

[0066] Example 2

[0067] The hydrophilic polyurethane sponge combination material with a low swelling rate was made from Component A and Component B in a mass ratio of 100:53. Among them, Component A included the following raw materials in parts by mass:

[0068] Water: 55 parts;

[0069] Wollastonite powder: 40 parts;

[0070] Quaternary ammonium salt of chitosan: 0.5 part;

[0071] 1000NI: 1.5 parts;

[0072] Polyether crosslinking agent: 3 parts;

[0073] Component B included the following raw materials in parts by mass:

[0074] Polyether ester polyol: 100 parts;

[0075] Toluene diisocyanate: 37 parts.

[0076] The toluene diisocyanate was a mixture of T65 and T100, and their mass ratio was 2:1.

[0077] The polyether crosslinking agent had a functionality of 3 and a number average molecular weight of 350; its preparation method included the following steps:

[0078] 1) Add 1 mol of triethanolamine and 0.15 g of KOH into a high-pressure reactor. After purging with nitrogen three times, evacuate to a pressure of -0.098 MPa. Heat up to 180 °C under vacuum conditions, keep the temperature for 2.5 h, then cool down to 122 °C. Continuously introduce 4.5 mol of EO and control the pressure in the reactor < 0.5 MPa. After introduction, keep the temperature at 120 °C and continue the reaction until a negative pressure appears in the system. Cool down and discharge to obtain the crude crosslinking agent;

[0079] 2) Add the crude crosslinking agent into a container equipped with a stirrer and a thermometer. Add distilled water and heat up to 75 °C, stir for 1.2 h; then add 0.15 g of phosphoric acid and continue stirring for 1.2 h; add 0.25 g of the refining agent magnesium silicate and stir for 1.2 h. Then, carry out vacuum dehydration at 115 °C until the water content ≤ 0.03 wt.%, and then filter to obtain the polyether-type crosslinking agent.

[0080] The hydroxyl value of the polyether ester polyol is 80 mg KOH / g; its preparation method includes the following steps:

[0081] Add 1419 g of polyethylene glycol (hydroxyl value is 280 mg KOH / g, functionality is 2), 376 g of diethylene glycol, 72 g of trimethylolpropane, and 750 g of adipic acid into a four-necked flask equipped with stirring, temperature control, and a condenser. Stir evenly. Under the protection of nitrogen, heat up to 230 °C for esterification reaction. Maintain the reaction system temperature at 230 °C and evacuate the system to dehydrate. Monitor the acid value and hydroxyl value of the system during the reaction. When the acid value ≤ 0.5 mg KOH / g and the hydroxyl value is 80 mg KOH / g, terminate the reaction. Cool down to 100 °C and discharge to obtain the polyether ester polyol;

[0082] The preparation method of the low-swelling hydrophilic polyurethane sponge blend includes the following steps:

[0083] (1) Preparation of component A: Put water, wollastonite powder, chitosan quaternary ammonium salt, 1000NI, and the polyether-type crosslinking agent into a reactor and stir at room temperature and a rotation speed of 45 r / min for 25 min to obtain component A;

[0084] (2) Preparation of component B: Put the polyether ester polyol into a reactor, heat up to 115 °C, dehydrate under vacuum conditions for 2.5 h, then cool down to 35 °C, add toluene diisocyanate, heat up to 78 °C, keep the temperature for 2.5 h, take samples for detection. When the measured -NCO content is 8.6 wt.%, cool down and discharge, and store in a sealed manner to obtain component B;

[0085] (3) Mix component A and component B evenly according to the mass ratio, inject into a mold, open the mold and cure after 4 min to obtain the low-swelling hydrophilic polyurethane sponge blend.

[0086] Example 3

[0087] The hydrophilic polyurethane sponge composite material with a low swelling rate is made from component A and component B in a mass ratio of 100:50. Among them, component A includes the following raw materials in parts by mass:

[0088] Water: 53.7 parts;

[0089] Wollastonite powder: 42.6 parts;

[0090] Chitosan quaternary ammonium salt: 0.7 part;

[0091] 1000NI: 1 part;

[0092] Polyether crosslinking agent: 2 parts;

[0093] Component B includes the following raw materials in parts by mass:

[0094] Polyether ester polyol: 100 parts;

[0095] Toluene diisocyanate: 35 parts.

[0096] The toluene diisocyanate is a mixture of T65 and T100, and its mass ratio is 1:1.

[0097] The functionality of the polyether crosslinking agent is 3 and its number average molecular weight is 400. Its preparation method includes the following steps:

[0098] 1) Add 1 mol of triethanolamine and 0.3 g of KOH to a high-pressure reactor. After purging with nitrogen three times, evacuate to a pressure of -0.1 MPa. Heat up to 175 °C under vacuum conditions, keep warm for 3 h, then cool down to 125 °C, continuously introduce 5.7 mol of EO, and control the pressure in the reactor < 0.5 MPa. After introduction, keep warm at 120 °C and continue the reaction until a negative pressure appears in the system. Cool down and discharge to obtain the crude crosslinking agent;

[0099] 2) Add the crude crosslinking agent to a container equipped with a stirrer and a thermometer, add distilled water, heat up to 80 °C, and stir for 1.5 h; then add 0.2 g of phosphoric acid and continue stirring for 1.5 h; then add 0.3 g of the refining agent magnesium silicate, stir for 1.5 h, and then dehydrate under vacuum at 120 °C until the water content ≤ 0.03 wt.%, and then filter to obtain the polyether crosslinking agent.

[0100] The hydroxyl value of the polyether ester polyol is 112 mg KOH / g. Its preparation method includes the following steps:

[0101] Add 1602 g of polyethylene glycol (hydroxyl value is 282 mgKOH / g, functionality is 2), 425 g of diethylene glycol, 81 g of trimethylolpropane, and 750 g of adipic acid into a four-necked flask equipped with stirring, temperature control, and a condenser tube. Stir evenly. Under the protection of nitrogen, heat up to 240 °C for an esterification reaction, maintain the reaction system temperature at 220 °C, and evacuate the system to dehydrate. Monitor the acid value and hydroxyl value of the system during the reaction. Terminate the reaction when the acid value ≤ 0.5 mgKOH / g and the hydroxyl value is 112 mgKOH / g. Cool down to 100 °C and discharge the material to obtain polyether ester polyol;

[0102] The preparation method of the low-swelling hydrophilic polyurethane sponge composite material includes the following steps:

[0103] (1) Preparation of component A: Put water, wollastonite powder, quaternary ammonium salt of chitosan, 1000NI, and a polyether-type crosslinking agent into a reaction kettle, and stir for 30 min at room temperature and a rotation speed of 50 r / min to obtain component A;

[0104] (2) Preparation of component B: Put polyether ester polyol into a reaction kettle, heat up to 80 °C, dehydrate under vacuum for 3 h, then cool down to 40 °C, add toluene diisocyanate, heat up to 80 °C, and keep the temperature for reaction for 3 h. Take a sample for detection. When the measured -NCO content is 10.5 wt.%, cool down and discharge the material, and store it sealed to obtain component B;

[0105] (3) Mix component A and component B evenly according to the mass ratio, inject them into a mold, open the mold and cure after 5 min to obtain the low-swelling hydrophilic polyurethane sponge composite material.

[0106] Comparative Example 1

[0107] The difference from Example 3 is that the polyether-type crosslinking agent in component A is replaced with the same mass fraction of triethanolamine, and the others are the same as in Example 3.

[0108] Comparative Example 2

[0109] The difference from Example 3 is that the polyether ester polyol in component B is replaced with the same mass fraction of PEG2000 (hydroxyl value is 112 mgKOH / g), and the others are the same as in Example 3.

[0110] Comparative Example 3

[0111] The difference from Example 3 is that the polyether ester polyol in component B is replaced with the same mass fraction of polyether ester polyol 2 (the difference in its preparation method from the polyether ester polyol in Example 3 is that during the preparation process, trimethylolpropane is replaced with an equimolar amount of 1,4-butanediol), and the others are the same as in Example 3.

[0112] Comparative Example 4

[0113] The difference from Example 3 is that toluene diisocyanate in Component B is replaced with T100 of the same mass fraction, and the others are the same as in Example 3.

[0114] Comparative Example 5

[0115] The difference from Example 3 is that toluene diisocyanate in Component B is replaced with T65 of the same mass fraction, and the others are the same as in Example 3.

[0116] The polyurethane sponge blends prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were subjected to performance tests, and the test methods were as follows:

[0117] Core density: Tested with reference to GB / T 6343-2009;

[0118] Tensile strength: Tested with reference to GB / T 6344-2008;

[0119] Elongation at break: Tested with reference to GB / T 6344-2008;

[0120] Tear strength: Tested with reference to GB / T 10808-2006;

[0121] The test method for rebound in water was as follows: A polyurethane sponge blend with dimensions of 20 mm × 20 mm × 20 mm was immersed in deionized water, taken out after 10 min, and the water was squeezed out forcefully, and the time required for the specimen to return to its original state was recorded.

[0122] The test method for water absorption rate was as follows: A polyurethane sponge blend specimen with dimensions of 20 mm × 20 mm × 10 mm was weighed, then the specimen was immersed in deionized water, taken out after 24 h, weighed after hanging in the air for 1 min, and the water absorption rate (W0) of the specimen was calculated according to the following formula:

[0123] ;

[0124] In the formula: m0 is the weight of the specimen after water absorption, g; m is the weight of the specimen before water absorption, g.

[0125] The test method for swelling ratio was as follows: A polyurethane sponge blend specimen with dimensions of 20 mm × 20 mm × 10 mm was used to calculate the volume, then the specimen was immersed in deionized water, taken out after 24 h, and the volume was measured after hanging in the air for 1 min, and the water absorption rate (W v ) was calculated according to the following formula:

[0126] ;

[0127] In the formula: V1 is the volume of the specimen after water absorption, mm 3; V0 is the volume of the specimen before water absorption, in mm 3 .

[0128] The test results are shown in Table 1.

[0129] Table 1 Performance test results

[0130]

[0131] From the data in Table 1, it can be seen that the polyurethane sponge blends prepared in Examples 1-3 not only have good resilience performance in water and excellent mechanical properties, but also have high water absorption rate and low swelling rate.

[0132] By comparing Comparative Example 1 with Example 3, it can be seen that by using the polyether-based crosslinking agent of the present invention, the mechanical properties and water absorption rate of the product can be improved.

[0133] By comparing Comparative Examples 2-3 with Example 3, it can be seen that by using the polyether ester polyol of the present invention, an ester bond segment and an ethylene oxide (EO) segment can be introduced into the molecular chain at the same time. The polyurethane sponge blend prepared therefrom not only has good hydrophilicity and high open cell rate, but also has low swelling rate and excellent mechanical properties.

[0134] By comparing Comparative Examples 4-5 with Example 3, it can be seen that when all T100 is used, although the foaming rate is high and the mechanical properties are good, the resilience in water is relatively poor; when all T65 is used, although the resilience in water is relatively good, the foam state and mechanical properties are relatively poor. Generally speaking, when the toluene diisocyanate in the formula components adopts the isomer ratio of the present invention, the comprehensive performance of the hydrophilic polyurethane sponge is the best.

Claims

1. A hydrophilic polyurethane sponge composite with a low swelling rate, characterized in that, It is made from component A and component B in a mass ratio of 100:(50 - 55). Among them, component A includes raw materials in the following mass parts: Blowing agent: 50 - 55 parts; Wollastonite powder: 40 - 45 parts; Antibacterial agent: 0.5 - 1 part; Emulsifying wax: 1 - 3 parts; Polyether crosslinking agent: 1 - 3 parts; Component B includes raw materials in the following mass parts: Polyether ester polyol: 100 parts; Toluene diisocyanate: 35 - 40 parts; The blowing agent described is water; The polyether crosslinking agent is prepared by ring-opening polymerization reaction of EO with triethanolamine as the initiator; The polyether ester polyol is prepared by esterification reaction with polyethylene glycol, diethylene glycol, trimethylolpropane and adipic acid as raw materials; The toluene diisocyanate described is a mixture of T65 and T100, and its mass ratio is (1 - 2):(2 - 1).

2. The hydrophilic polyurethane sponge composition with a low swelling rate according to claim 1, characterized in that, The fineness of the wollastonite powder described is 400 - 800 mesh.

3. The hydrophilic polyurethane sponge composite material with a low swelling rate according to claim 1, characterized in that, The antibacterial agent described is chitosan quaternary ammonium salt.

4. The hydrophilic polyurethane sponge composition with a low swelling rate according to claim 1, characterized in that, The emulsifying wax described is a non-ionic emulsifying matrix.

5. The hydrophilic polyurethane sponge composite material with a low swelling rate according to claim 1, wherein The functionality of the polyether crosslinking agent described is 3, and the number average molecular weight is 300 - 400; its preparation method, Includes the following steps: Add triethanolamine and KOH to the reaction kettle, heat up to 170 - 180 °C under vacuum conditions, keep warm for 2 - 3 h, then cool down to 120 - 125 °C, introduce EO, and control the pressure in the kettle < 0.5 MPa. React until a negative pressure appears in the system to obtain a crude crosslinking agent, and obtain the polyether crosslinking agent after refining.

6. The hydrophilic polyurethane sponge composite according to claim 1, wherein The hydroxyl value of the polyether ester polyol described is 56 - 112 mgKOH / g; its preparation method includes the following steps: Add polyethylene glycol, diethylene glycol, trimethylolpropane and adipic acid to the reactor, heat up to 220 - 240 °C for esterification reaction, maintain the reaction system temperature at 220 - 240 °C, and evacuate the system to dehydrate. Monitor the acid value and hydroxyl value of the system during the reaction. When the acid value ≤ 0.5 mgKOH / g and the hydroxyl value reaches the theoretical value, terminate the reaction to obtain the polyether ester polyol; among them, the hydroxyl value of the polyethylene glycol described is 278 - 282 mgKOH / g, and the functionality is 2.

7. A method for preparing the hydrophilic polyurethane sponge composition with a low swelling rate according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Preparation of component A: Put the blowing agent, wollastonite powder, antibacterial agent, emulsifying wax and polyether crosslinking agent into the reaction kettle, and stir at room temperature and a rotation speed of 40 - 50 r / min for 20 - 30 min to obtain component A; (2) Preparation of component B: Add toluene diisocyanate to the dehydrated polyether ester polyol, heat up to 75 - 80 °C, keep warm and react for 2 - 3 h, and measure its -NCO content to be 6.0 - 10.5 wt.% to obtain component B; (3) Mix component A and component B evenly according to the mass ratio, inject them into the mold, open the mold and cure after 3 - 5 min to obtain a low swelling rate hydrophilic polyurethane sponge composite material.

8. Use of the hydrophilic polyurethane sponge composition with a low swelling rate according to any one of claims 1-6, characterized in that, For preparing cotton pads for makeup.

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