Waterborne polyurethane roller glue as well as preparation method and application thereof

Abstract

The invention discloses waterborne polyurethane roller glue as well as a preparation method and application thereof. The waterborne polyurethane roller glue comprises the following components in parts by weight: 100 parts of a waterborne polyurethane dispersion, 15-35 parts of a plasticizer and 5-20 parts of a stabilizer aqueous solution, the waterborne polyurethane dispersion is prepared from the following raw materials in percentage by weight: 5 to 20 percent of aliphatic diisocyanate, 70 to 90 percent of polyol, 1 to 5 percent of a hydrophilic compound, 1 to 3 percent of a chain extender and 0.007 to 0.035 percent of an emulsifier, wherein the total weight of solid components is 100 percent. The waterborne polyurethane roller glue has the characteristics of good initial adhesion, good heat storage stability and vibration stability, no halogen, yellowing resistance, low odor, recyclability and the like, is mainly suitable for adhesion of porous base materials such as sponge mattresses and the like, and can replace the existing waterborne chloroprene rubber roller glue.

Description

Technical Field

[0001] The invention relates to a roller rubber combination material for a polyurethane mattress, in particular to a water-based polyurethane roller rubber and a preparation method and application thereof. Background Art

[0002] With the improvement of people's consumption capacity and the acceleration of upgrading and iteration of household products, most mattresses will be discarded after 10 years of use, which not only causes waste of resources, but also generates a large amount of waste. According to incomplete statistics, more than 90 million mattresses are discarded every year, occupying more than 70 million square meters of landfill space, but 75% of mattresses are recyclable. In recent years, sponge recycling has attracted much attention. Sponges are mostly foamed by polyisocyanates and polyester polyether polyols. The current optimal recycling technology is to generate polyamine compounds and polyester / polyether polyols after high-temperature cracking of sponges. After polyamines are processed into polyisocyanates, they are reused with polyester / polyether polyols to make sponges, realizing the cycle of the entire industrial chain.

[0003] At present, the water-based adhesive used for mattress bonding is a water-based chloroprene system. Since water-based chloroprene is quite different from the polyurethane system, the chloroprene layer in the mattress needs to be removed first during the cracking and recovery process, otherwise it will affect the purification of the raw materials, which will greatly hinder the cracking and recovery of the sponge. In addition, water-based chloroprene has the problems of containing halogens, yellowing, sensitization, high energy consumption during production, and high prices. The market is also looking for alternative products to water-based chloroprene. Invention patent CN 109536080A discloses a water-based roller glue compounded from natural latex, acrylic latex and styrene-butadiene latex, which can replace water-based chloroprene in terms of performance, but has a strong odor problem and is difficult to be applied to mattress products. In addition, this system is also quite different from the polyurethane system, which hinders the cracking and recovery of the sponge. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a water-based polyurethane roller glue and a preparation method and application thereof. The water-based polyurethane roller glue of the present invention has the characteristics of good initial adhesion, good heat storage stability and shock stability, halogen-free, yellowing resistance, low odor and recyclability, and is mainly suitable for bonding porous substrates such as sponge mattresses, and can replace the existing water-based chloroprene roller glue.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A water-based polyurethane roller glue comprises the following components in parts by weight: 100 parts of water-based polyurethane dispersion, 15-35 parts of plasticizer, and 5-20 parts of stabilizer aqueous solution;

[0007] The aqueous polyurethane dispersion comprises the following raw materials, based on the total weight of solid components being 100%:

[0008] Aliphatic diisocyanate 5-20%,

[0009] Polyol 70-90%,

[0010] Hydrophilic compounds 1-5%,

[0011] Chain extender 1-3%,

[0012] Emulsifier 0.007-0.035%.

[0013] Preferably, the solid content of the aqueous polyurethane dispersion is 41-43%.

[0014] In some preferred examples of the present invention, the plasticizer is one or both of dipropylene glycol dibenzoate and diethylene glycol dibenzoate.

[0015] In some preferred examples of the present invention, the aqueous stabilizer solution is one or more aqueous solutions of sodium carboxymethylcellulose, hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, xanthan gum, sesbania gum and guar gum;

[0016] Preferably, the mass concentration of the stabilizer in the stabilizer aqueous solution is 1-5%.

[0017] In some preferred examples of the present invention, the aliphatic diisocyanate is selected from one or more of hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexylmethane diisocyanate;

[0018] Preferably, the polyol comprises a crystalline polyester polyol and a low / non-crystalline polyester polyol in a mass ratio greater than 1, preferably the mass ratio of the two is (6-10):1, more preferably (7-9):1.

[0019] Preferably, the melting temperature of the crystalline polyester polyol measured by differential scanning calorimetry at a heating rate of 20 K / min according to DIN 65467 is in the range of 40 to 80° C.;

[0020] Preferably, the low / non-crystalline polyester polyol has a melting temperature below 30° C. as measured by differential scanning calorimetry according to DIN 65467 at a heating rate of 20 K / min.

[0021] In some preferred examples of the present invention, the hydrophilic compound is a hydrophilic compound containing an ionic group and / or a hydrophilic compound containing a nonionic group;

[0022] Preferably, the hydrophilic compound containing an ionic group is one or more of dimethylolpropionic acid, dimethylolbutanoic acid, N-(2-aminoethyl)-2-aminoethanesulfonic acid, N-(3-aminopropyl)-2-aminoethanesulfonic acid and soluble salts thereof;

[0023] Preferably, the hydrophilic compound containing a nonionic group is polyethylene glycol monomethyl ether, preferably polyethylene glycol monomethyl ether having a number average molecular weight of 500-2000.

[0024] In some preferred examples of the present invention, the chain extender is one or more of ethylene glycol, 1,4-butanediol, ethylenediamine, hydroxyethylethylenediamine, and isophoronediamine.

[0025] In some preferred examples of the present invention, the emulsifier is one or more of anionic emulsifiers, nonionic emulsifiers, and anionic nonionic emulsifiers, preferably one or more of alkyl polyoxyethylene ether sodium sulfate (such as Klein EPA-073), disodium salt of ethoxyethanol sulfosuccinate (such as Solvay DES-30), sodium dodecyl sulfate SDS, sodium dodecylbenzene sulfonate SDBS, and polyoxyethylene sorbitan monolaurate (such as Tween 20).

[0026] The present invention also provides a method for preparing the waterborne polyurethane roller glue as described above, characterized in that the waterborne polyurethane dispersion and the stabilizer aqueous solution are first mixed and stirred for 15-30 minutes, then a plasticizer is added, stirred for 30-60 minutes, and the material is filtered out.

[0027] Preferably, the preparation method of the aqueous polyurethane dispersion is as follows:

[0028] Add dehydrated aliphatic diisocyanate, polyol, organic solvent, and optionally hydrophilic compound A into a reaction container, react at 80-90°C to obtain an NCO-terminated prepolymer; then add a chain extender and optionally hydrophilic compound B to carry out a chain extension reaction at a reaction temperature of 40-50°C, then add water for dispersion, remove the organic solvent, and add an emulsifier to obtain an aqueous polyurethane dispersion; wherein the hydrophilic compound A is a hydrophilic compound containing a nonionic group and / or dimethylol propionic acid, dimethylol butyric acid; the hydrophilic compound B is a hydrophilic compound containing an ionic group other than dimethylol propionic acid and dimethylol butyric acid; at least one of the hydrophilic compound A and the hydrophilic compound B is added into the system;

[0029] When the hydrophilic compound A is selected from dimethylol propionic acid and dimethylol butyric acid, it is known in the art that a salt-forming agent needs to be added during the chain extension reaction to neutralize the hydrophilic compound and form a salt. Preferably, the salt-forming agent is triethylamine (TEA).

[0030] Preferably, the organic solvent is selected from one or more of acetone and butanone;

[0031] Preferably, the solid content of the aqueous polyurethane dispersion is 41-43%.

[0032] The present invention also provides an application of the water-based polyurethane roller rubber as described above or the water-based polyurethane roller rubber prepared by the method described above in a sponge mattress.

[0033] In the water-based polyurethane roller glue formula of the present invention, the water-based polyurethane dispersion contains a very small amount of emulsifier to adjust the low stability of the emulsion. At the same time, the plasticizer further reduces the emulsion stability while reducing the roller glue activation temperature and increasing the solid viscosity; finally, the roller glue stability is adjusted by adding a stabilizer, and the initial adhesion of light pressure can be improved. The above three are coordinated and matched to adjust the stability of the emulsion to a metastable state. In this state, the roller glue is immediately pressed on the sponge to break the emulsion and form a film to achieve bonding. At the same time, the roller glue also has good shock stability, heat storage stability and roller coating stability, which can meet normal transportation and use. In addition, the water-based polyurethane roller glue and sponge in the present invention are both polyurethane systems, which can form a single material with the sponge and can be cracked and recovered without removing the glue layer. In addition, the water-based polyurethane also has the advantages of being halogen-free, yellowing-resistant, and low in odor, and can perfectly replace the water-based chloroprene system. DETAILED DESCRIPTION

[0034] The present invention is further described below by means of specific examples. The examples described in the present invention are only used to illustrate the present invention and do not limit the scope of the present invention.

[0035] In the following examples of the present invention, the raw materials and reagents used can be obtained through conventional commercial channels unless otherwise specified, wherein the main raw material information is as follows:

[0036] Crystalline polyester polyol WHP 104: poly(1,4-butylene adipate), molecular weight 1000, melting point 30-50°C, Wanhua Chemical

[0037] Crystalline polyester polyol WHP 204: poly(1,4-butylene adipate), molecular weight 2000, melting point 35-55°C, Wanhua Chemical

[0038] Crystalline polyester polyol WHP 304: poly(1,4-butylene adipate), molecular weight 3000, melting point 40-60°C, Wanhua Chemical

[0039] Crystalline polyester polyol WHP 404: poly(1,4-butylene adipate), molecular weight 4000, melting point 40-60°C, Wanhua Chemical

[0040] Low / amorphous polyester polyol WHP 2056: adipic acid / hexanediol / neopentyl glycol copolymer, molecular weight 2000, melting point <25°C, Wanhua Chemical

[0041] Low / amorphous polyester polyol WHP 2027: ethylene glycol / diethylene glycol / adipic acid copolymer, molecular weight 2000, melting point <25°C, Wanhua Chemical

[0042] Low / amorphous polyester polyol WHP 4024: ethylene glycol / butanediol / adipic acid copolymer, molecular weight 4000, melting point <25°C, Wanhua Chemical

[0043] Low / amorphous polyester polyol WHP 1045: butanediol / neopentyl glycol / adipic acid copolymer, molecular weight 1000, melting point <25°C, Wanhua Chemical

[0044] MPEG-520, MPEG-1200, MPEG-2000: monofunctional polyoxyethylene ether, number average molecular weight 520, 1200, 2000, functionality 1, Haian Petrochemical

[0045] DMPA: dimethylolpropionic acid, J&K

[0046] IPDI: Isophorone diisocyanate, Wanhua Chemical

[0047] HDI: 1,6-hexanediisocyanate, Wanhua Chemical

[0048] HMDI: dicyclohexylmethane diisocyanate, Wanhua Chemical

[0049] A95: N-(2-aminoethyl)-2-aminoethanesulfonic acid sodium salt aqueous solution, Evonik, Germany:

[0050] EDA-OH: Hydroxyethylethylenediamine, BASF, Germany:

[0051] EDA: Ethylenediamine, Sinopharm Group

[0052] TEA: triethylamine, Sinopharm Group

[0053] IPDA: Isophorone diamine, Wanhua Chemical

[0054] FLEX-80: a 4:1 mixture of dipropylene glycol dibenzoate and diethylene glycol dibenzoate, Wuhan Yikede

[0055] FLEX-314: Diethylene glycol dibenzoate, Wuhan Yikede

[0056] FLEX-80: Dipropylene glycol dibenzoate, Wuhan Yikede

[0057] Sesbania gum, guar gum, hydroxypropyl methylcellulose: Xinrui Biotechnology

[0058] CMC: Sodium carboxymethyl cellulose, Shandong Yangzi Biotechnology Co., Ltd.

[0059] SDS, SDBS, TW20: Sinopharm Group

[0060] EPA-073; Solvay

[0061] Note: In the following preparation examples, the raw materials of the waterborne polyurethane dispersions were first dehydrated and then mixed for reaction.

[0062] Preparation Example 1: Preparation of Aqueous Polyurethane Dispersion 1

[0063] 200g WHP 204, 25g WHP 2056, 26g HDI, 1.2g MPEG-1200, and 25g acetone were added to a 2L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and reacted at 80°C until the NCO content no longer decreased to obtain an NCO-terminated prepolymer; the prepolymer was dissolved in 400g acetone and cooled to 40°C. A total of 35g of an aqueous solution containing 2.7g IPDA and 3g A95 was added to the prepolymer solution, and stirred vigorously for 20min, and then 293g of water was added. After sufficient dispersion, the acetone was distilled off, and then 0.018g of emulsifier SDS was added to obtain an aqueous polyurethane dispersion 1 with a solid content of 42%.

[0064] Preparation Example 2: Preparation of Aqueous Polyurethane Dispersion 2

[0065] 200g WHP 304, 32g WHP 2027, 40g HMDI, and 25g acetone were added to a 2L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and reacted at 85°C until the NCO content no longer decreased to obtain an NCO-terminated prepolymer; the prepolymer was dissolved in 400g acetone and cooled to 45°C. A total of 35g of an aqueous solution containing 3.5g IPDA, 2.5g A95, and 2.5g EDA-OH was added to the prepolymer solution, and stirred vigorously for 20min, and then 324g of water was added. After sufficient dispersion, the acetone was distilled off, and then 0.057g of emulsifier SDBS was added to obtain an aqueous polyurethane dispersion 2, and the solid content was adjusted to 42%.

[0066] Preparation Example 3: Preparation of Aqueous Polyurethane Dispersion 3

[0067] 200g WHP 404, 20g WHP 4024, 17g HMDI, 3g MPEG-520, and 25g acetone were added to a 2L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and reacted at 90°C until the NCO content no longer decreased to obtain an NCO-terminated prepolymer; the prepolymer was dissolved in 400g acetone and cooled to 50°C. A total of 35g of an aqueous solution containing 2.6g IPDA, 0.4g EDA, and 0.5g A95 was added to the above prepolymer solution, and vigorously stirred for 20min, and then 290g water was added. After sufficient dispersion, the acetone was distilled off, and then 0.02g emulsifier SDS and 0.02g emulsifier EPA-073 were added to obtain an aqueous polyurethane dispersion 3, and the solid content was adjusted to 42%.

[0068] Preparation Example 4: Preparation of Aqueous Polyurethane Dispersion 2

[0069] 140 g of WHP 104, 16 g of WHP 1045, 22 g of HDI, 25 g of IPDI, 3 g of DMPA, 8 g of MPEG-1200, and 25 g of acetone were added to a 2 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and reacted at 85° C. until the NCO content no longer decreased, thereby obtaining an NCO-terminated prepolymer; the prepolymer was dissolved in 400 g of acetone and cooled to 40° C., 2.3 g of TEA was added to form a salt for 5 minutes, and a total of 35 g of an aqueous solution containing 5 g of IPDA and 1.3 g of EDA-OH was added to the prepolymer solution, while vigorously stirring for 20 min, and then 243 g of water was added. After sufficient dispersion, the acetone was distilled off, and then 0.057 g of emulsifier TW20 and 0.02 g of emulsifier EPA-073 were added to obtain an aqueous polyurethane dispersion 4, and the solid content was adjusted to 42%.

[0070] Preparation Example 5: Preparation of Aqueous Polyurethane Dispersion 5

[0071] 210 g WHP 204, 28 g WHP 2056, 50 g HDI, 0.5 g DMBA, 3 g MPEG-1200 and 25 g acetone were added to a 2 L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and reacted at 85° C. until the NCO content no longer decreased, thereby obtaining an NCO-terminated prepolymer; the prepolymer was dissolved in 400 g acetone and cooled to 40° C., 0.35 g TEA was added to form a salt for 5 min, and 35 g of an aqueous solution containing 1 g A95, 0.2 g EDA and 3 g EDA-OH was added to the prepolymer solution, and vigorously stirred for 20 min, and then 331 g of water was added. After sufficient dispersion, the acetone was distilled off, and then 0.074 g of emulsifier SDS was added to obtain an aqueous polyurethane dispersion 5, and the solid content was adjusted to 42%.

[0072] Comparative Preparation Example 1: Aqueous Polyurethane Dispersion 6

[0073] An aqueous polyurethane dispersion was prepared in substantially the same manner as in Preparation Example 1, except that no emulsifier SDS was added after the reaction, thereby obtaining an emulsified aqueous polyurethane dispersion 6.

[0074] Comparative Preparation Example 2: Aqueous Polyurethane Dispersion 7

[0075] An aqueous polyurethane dispersion was prepared in substantially the same manner as in Preparation Example 1, except that 0.15 g of emulsifier SDS was added instead of 0.018 g of emulsifier SDS after the reaction, to obtain aqueous polyurethane dispersion 7.

[0076] [Example 1] Preparation of finished rubber

[0077] 1 100 parts of aqueous polyurethane dispersion,

[0078] FLEX-80 25 parts,

[0079] 8 parts of 1.2wt% sesbania gum aqueous solution.

[0080] According to the above weight proportions, the aqueous polyurethane dispersion 1 was first mixed with the sesbania glue aqueous solution and stirred for 15 minutes, and then the plasticizer FLEX-80 was added and stirred for 45 minutes, and the material was filtered out.

[0081] [Example 2] Preparation of finished rubber

[0082] 100 parts of aqueous polyurethane dispersion 2,

[0083] FLEX-80 35 parts,

[0084] 20 parts of 1 wt% hydroxypropyl methylcellulose aqueous solution.

[0085] According to the above weight proportions, the aqueous polyurethane dispersion 2 was first mixed with the hydroxypropyl methylcellulose aqueous solution and stirred for 15 minutes, and then the plasticizer FLEX-80 was added and stirred for 45 minutes, and the material was filtered out.

[0086] [Example 3] Preparation of finished rubber

[0087] 100 parts of aqueous polyurethane dispersion,

[0088] FLEX-314 20 copies,

[0089] 5 parts of 2wt% sodium carboxymethylcellulose aqueous solution.

[0090] According to the above weight proportions, the aqueous polyurethane dispersion 3 was first mixed with the carboxymethyl cellulose aqueous solution and stirred for 15 minutes, and then the plasticizer FLEX-314 was added and stirred for 45 minutes, and the material was filtered out.

[0091] [Example 4] Preparation of finished rubber

[0092] 100 parts of aqueous polyurethane dispersion 4,

[0093] FLEX-342 15 copies,

[0094] 5 parts of 5wt% xanthan gum aqueous solution.

[0095] According to the above weight proportions, the aqueous polyurethane dispersion 1 was first mixed with the xanthan gum aqueous solution and stirred for 15 minutes, and then the plasticizer FLEX-342 was added and stirred for 45 minutes, and the material was filtered out.

[0096] [Example 5] Preparation of finished rubber

[0097] 100 parts of aqueous polyurethane dispersion,

[0098] FLEX-80 30 servings,

[0099] 15 parts of 2.5wt% guar gum aqueous solution.

[0100] According to the above weight proportions, the aqueous polyurethane dispersion 1 was first mixed with the guar gum aqueous solution and stirred for 15 minutes, and then the plasticizer FLEX-80 was added and stirred for 45 minutes, and the material was filtered out.

[0101] [Comparative Example 1]

[0102] A water-based polyurethane roller glue was prepared according to the same formula and method as in Example 1, except that the water-based polyurethane dispersion 1 was replaced by the water-based polyurethane dispersion 6 of the same mass.

[0103] [Comparative Example 2]

[0104] A water-based polyurethane roller glue was prepared according to the same formula and method as in Example 1, except that the water-based polyurethane dispersion 1 was replaced by the water-based polyurethane dispersion 7 of the same mass.

[0105] [Comparative Example 3]

[0106] A water-based polyurethane roller glue was prepared according to the same formula and method as in Example 1, except that no sesbania glue solution was added during the preparation of the finished glue.

[0107] Test substrate and method for water-based polyurethane roller adhesive:

[0108] Sponge A size: 15*10*3cm Density: 35D

[0109] Sponge B size: 15*10*3cm Density: 50D

[0110] 1. Light pressure initial adhesion test: Use a roller glue machine to apply water-based polyurethane roller glue on the surface of sponge A, and control the glue application amount to 50g / m 2 Then place sponge A with the adhesive side facing down on the surface of sponge B. Press a 300g weight on the surface of sponge A for 5s. Remove the weight, lift sponge A to observe whether sponge B can be lifted up. If so, shake it back and forth left and right, and record the number of times sponge B is shaken down. The more times, the stronger the initial adhesion.

[0111] 2. Heavy pressure initial adhesion test: Use a roller glue machine to apply water-based polyurethane roller glue on the surface of sponge A, and control the glue application amount to 50g / m 2 Then place sponge A with the adhesive surface facing down on the surface of sponge B, press a 3000g weight on the surface of sponge A for 5s, remove the weight, tear the two sponges apart, and score the tearing force (full score is 5 points, and a score ≥3.5 is qualified). The greater the force, the higher the score.

[0112] 3. Hot storage viscosity stability: Place the water-based polyurethane roller glue at 50°C for 14 days and record the viscosity retention rate. The viscosity retention rate = viscosity after hot storage / initial viscosity.

[0113] 4. Oscillation stability: Take 300 ml of water-based polyurethane roller glue and place it in a 500 ml straight bottle and place it in a water bath oscillator. Oscillate it at 25℃*60RMP / min for 24 hours. Filter it with a 100-mesh filter to test the residue content.

[0114] 5. Roller coating stability: Pour 5kg of water-based polyurethane roller glue into the middle of the roller glue machine, run the roller empty for 45 minutes, and observe whether the roller has slag. If there is no slag, it is recorded as excellent, and if there is slag, it is recorded as poor.

[0115] Table 1. Test results of waterborne polyurethane roller adhesive performance

[0116]

[0117] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A water-based polyurethane roller glue, characterized in that: The method comprises the following components in parts by weight: 100 parts of aqueous polyurethane dispersion, 15-35 parts of plasticizer, and 5-20 parts of stabilizer aqueous solution; The aqueous polyurethane dispersion comprises the following raw materials, based on the total weight of solid components being 100%: Aliphatic diisocyanate 5-20%, Polyol 70-90%, Hydrophilic compounds 1-5%, Chain extender 1-3%, Emulsifier 0.007-0.035%.

2. The water-based polyurethane roller glue according to claim 1, characterized in that: The plasticizer is one or both of dipropylene glycol dibenzoate and diethylene glycol dibenzoate.

3. The water-based polyurethane roller glue according to claim 1, characterized in that: The stabilizer aqueous solution is one or more aqueous solutions of sodium carboxymethyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, xanthan gum, sesbania gum and guar gum; Preferably, the mass concentration of the stabilizer in the stabilizer aqueous solution is 1-5%.

4. The water-based polyurethane roller glue according to claim 1, characterized in that: The aliphatic diisocyanate is selected from one or more of hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexylmethane diisocyanate; Preferably, the polyol comprises a crystalline polyester polyol and a low / non-crystalline polyester polyol in a mass ratio greater than 1, preferably a mass ratio of (6-10):1, more preferably (7-9):

1.

5. The water-based polyurethane roller rubber according to any one of claims 1 to 4, characterized in that: The hydrophilic compound is a hydrophilic compound containing an ionic group and / or a hydrophilic compound containing a nonionic group; Preferably, the hydrophilic compound containing an ionic group is one or more of dimethylolpropionic acid, dimethylolbutanoic acid, N-(2-aminoethyl)-2-aminoethanesulfonic acid, N-(3-aminopropyl)-2-aminoethanesulfonic acid and soluble salts thereof; Preferably, the hydrophilic compound containing a nonionic group is polyethylene glycol monomethyl ether, preferably polyethylene glycol monomethyl ether having a number average molecular weight of 500-2000.

6. The water-based polyurethane roller rubber according to any one of claims 1 to 5, characterized in that: The chain extender is one or more of ethylene glycol, 1,4-butanediol, ethylenediamine, hydroxyethylethylenediamine, and isophoronediamine.

7. The water-based polyurethane roller glue according to any one of claims 1 to 6, characterized in that: The emulsifier is one or more of anionic emulsifiers, nonionic emulsifiers, and anionic nonionic emulsifiers, preferably one or more of isomeric tridecyl alcohol sodium sulfate, alkyl polyoxyethylene ether sodium sulfate, ethoxyethanol sulfosuccinate monoester disodium salt, sodium dodecyl sulfate SDS, sodium dodecylbenzene sulfonate SDBS, and polyoxyethylene sorbitan monolaurate.

8. A method for preparing the waterborne polyurethane roller rubber according to any one of claims 1 to 7, characterized in that: The aqueous polyurethane dispersion and the stabilizer aqueous solution are first mixed and stirred for 15-30 minutes, and then the plasticizer is added, stirred for 30-60 minutes, and the material is filtered out.

9. The method for preparing the water-based polyurethane roller rubber according to any one of claims 1 to 7, characterized in that: The preparation method of the aqueous polyurethane dispersion is as follows: Add dehydrated aliphatic diisocyanate, polyol, organic solvent, and optionally hydrophilic compound A into a reaction container, react at 80-90°C to obtain an NCO-terminated prepolymer; then add a chain extender and optionally hydrophilic compound B to carry out a chain extension reaction at a reaction temperature of 40-50°C, then add water for dispersion, remove the organic solvent, and add an emulsifier to obtain an aqueous polyurethane dispersion; wherein the hydrophilic compound A is selected from hydrophilic compounds containing nonionic groups and / or dimethylol propionic acid and dimethylol butyric acid; the hydrophilic compound B is a hydrophilic compound containing ionic groups other than dimethylol propionic acid and dimethylol butyric acid; at least one of the hydrophilic compound A and the hydrophilic compound B is added into the system; Preferably, the organic solvent is selected from one or more of acetone and butanone; Preferably, the solid content of the aqueous polyurethane dispersion is 41-43%.

10. Use of the water-based polyurethane roller rubber as claimed in any one of claims 1 to 7 or the water-based polyurethane roller rubber prepared by the method as claimed in claim 8 or 9 in a sponge mattress.

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