Waterborne polyurethane emulsion, preparation method and impregnated gloves

Abstract

The present invention relates to a waterborne polyurethane emulsion. During preparation of the waterborne polyurethane emulsion, raw materials comprise an organosilicon polyol and modified silicon nanoparticles capable of reacting with hydrophilic groups in polyurethane molecular chains, so that the waterborne polyurethane molecular chains are introduced into reactive organosilicon and the modified silicon nanoparticles. The preparation method comprises the following steps: during preparation of a polyurethane prepolymer, taking an isocyanate and polyol as raw materials, and carrying out a reaction in the presence of a catalyst and a chain extender to obtain the polyurethane prepolymer, wherein the polyol contains at least one organosilicon polyol; and during preparation of the waterbornepolyurethane emulsion, mixing the polyurethane prepolymer with a water solution containing the modified silicon nanoparticles for emulsification to obtain the waterborne polyurethane emulsion. Compared with an existing mode of adding a filler by physical mixing to modify the waterborne polyurethane resin, the method provided by the invention has the advantages that water resistance / solvent resistance, low-temperature flexibility and wear resistance of the waterborne polyurethane resin can be improved, and retention timeliness of the excellent performance is longer.

Description

technical field

[0001] The invention belongs to the technical field of preparation of polymer polyurethane emulsion, in particular to an aqueous polyurethane emulsion with high wear resistance, softness and hydrolysis resistance after curing, a preparation method thereof, and a dipped glove prepared by using the polyurethane emulsion. Background technique

[0002] Polyurethane dipped gloves are obtained by covering the outside of a knitted or cotton glove embryo with a polyurethane resin slurry, and the main component of the polyurethane resin slurry is polyurethane resin. There are mainly two systems of polyurethane resin slurry for making dipped gloves at present, namely DMF (N,N-dimethylformamide) solvent-type polyurethane resin slurry and emulsion-type polyurethane resin slurry. In the production and use of solvent-based polyurethane resin slurry, a large amount of organic solvent DMF, which will cause serious damage to the human liver, is inevitably used, and the use of...

Examples

Embodiment 1

[0052] The present embodiment prepares a modified water-based polyurethane dipped glove, comprising steps:

[0053] S1: add 10 parts by mass of dehydrated hydroxyl-terminated polydimethylsiloxane diol and 40 parts by mass of polyethylene adipate, 10 parts by mass of toluene diisocyanate and 0.5 parts by mass of stannous octoate into the container , stir evenly at 60°C for 2h, then add 2 parts by mass of chain extender sodium ethylenediaminoethanesulfonate, continue to react at 50°C for 2h, then add 30 parts by mass of acetone to reduce the viscosity, and add 0.5 parts by mass of trisulfate. Ethylamine was neutralized, and the reaction was continued at 60 °C for 1 h until the content of isocyanate group-NCO was constant, and the temperature was lowered to obtain a polyurethane prepolymer.

[0054] S2: then add the polyurethane prepolymer to 120 mL of 2 parts by mass of sodium ethylenediamine ethanesulfonate and 1 part by mass of epoxy group-modified silica sol for emulsificatio...

Embodiment 2

[0057] In this example, on the basis of Example 1, the reactive silicone is selected as "alkoxy-terminated polydimethylsiloxane", the types of isocyanates, catalysts, and modified silicon nanoparticles are changed, and the types of The amount of raw materials used.

[0058] The present embodiment prepares a modified water-based polyurethane dipped glove, comprising the steps:

[0059] S1: 8 parts by mass of dehydrated alkoxy-terminated polydimethylsiloxane and 40 parts by mass of polytrimethylene adipate polyol, 7 parts by mass of diphenylmethane diisocyanate and 0.5 parts by mass of N-ethyl methacrylate Add linoline to the container, stir evenly at 70°C for 2h, then add 2 parts by mass of chain extender 1,4-cyclohexanediol, continue to react at 70°C for 2h, then add 30 parts by mass of acetone to reduce viscosity, and add 0.5 parts by mass of ethanolamine was neutralized, the reaction was continued at 70° C. for 1 h until the content of isocyanate group-NCO was constant, and...

Embodiment 3

[0063] In this example, on the basis of Example 1, the reactive silicone is selected as "polyether hydroxyl terminated polydimethylsiloxane", the types of isocyanates, catalysts, and modified silicon nanoparticles are changed and fine-tuned The amount of each raw material.

[0064] The present embodiment prepares a modified water-based polyurethane dipped glove, comprising the steps:

[0065] S1: 9 parts by mass of dehydrated polyether hydroxyl terminated polydimethylsiloxane and 35 parts by mass of polytrimethylene adipate polyol, 12 parts by mass of 1,6-hexamethylene diisocyanate and 0.5 parts by mass of dilauric acid Dibutyltin was added to the container, stirred evenly and reacted at 50°C for 2h, then added 2 parts by mass of 1,4-butanediol, continued to react at 50°C for 2h, then added 25 parts by mass of acetone to reduce viscosity, and added 0.5 part by mass Triethylamine was neutralized, and the reaction was continued at 60° C. for 1 h until the isocyanate group conte...

technical field

[0001] The invention belongs to the technical field of preparation of polymer polyurethane emulsion, in particular to an aqueous polyurethane emulsion with high wear resistance, softness and hydrolysis resistance after curing, a preparation method thereof, and a dipped glove prepared by using the polyurethane emulsion. Background technique

[0002] Polyurethane dipped gloves are obtained by covering the outside of a knitted or cotton glove embryo with a polyurethane resin slurry, and the main component of the polyurethane resin slurry is polyurethane resin. There are mainly two systems of polyurethane resin slurry for making dipped gloves at present, namely DMF (N,N-dimethylformamide) solvent-type polyurethane resin slurry and emulsion-type polyurethane resin slurry. In the production and use of solvent-based polyurethane resin slurry, a large amount of organic solvent DMF, which will cause serious damage to the human liver, is inevitably used, and the use of...

Examples

Embodiment 1

[0052] The present embodiment prepares a modified water-based polyurethane dipped glove, comprising steps:

[0053] S1: add 10 parts by mass of dehydrated hydroxyl-terminated polydimethylsiloxane diol and 40 parts by mass of polyethylene adipate, 10 parts by mass of toluene diisocyanate and 0.5 parts by mass of stannous octoate into the container , stir evenly at 60°C for 2h, then add 2 parts by mass of chain extender sodium ethylenediaminoethanesulfonate, continue to react at 50°C for 2h, then add 30 parts by mass of acetone to reduce the viscosity, and add 0.5 parts by mass of trisulfate. Ethylamine was neutralized, and the reaction was continued at 60 °C for 1 h until the content of isocyanate group-NCO was constant, and the temperature was lowered to obtain a polyurethane prepolymer.

[0054] S2: then add the polyurethane prepolymer to 120 mL of 2 parts by mass of sodium ethylenediamine ethanesulfonate and 1 part by mass of epoxy group-modified silica sol for emulsificatio...

Embodiment 2

[0057] In this example, on the basis of Example 1, the reactive silicone is selected as "alkoxy-terminated polydimethylsiloxane", the types of isocyanates, catalysts, and modified silicon nanoparticles are changed, and the types of The amount of raw materials used.

[0058] The present embodiment prepares a modified water-based polyurethane dipped glove, comprising the steps:

[0059] S1: 8 parts by mass of dehydrated alkoxy-terminated polydimethylsiloxane and 40 parts by mass of polytrimethylene adipate polyol, 7 parts by mass of diphenylmethane diisocyanate and 0.5 parts by mass of N-ethyl methacrylate Add linoline to the container, stir evenly at 70°C for 2h, then add 2 parts by mass of chain extender 1,4-cyclohexanediol, continue to react at 70°C for 2h, then add 30 parts by mass of acetone to reduce viscosity, and add 0.5 parts by mass of ethanolamine was neutralized, the reaction was continued at 70° C. for 1 h until the content of isocyanate group-NCO was constant, and...

Embodiment 3

[0063] In this example, on the basis of Example 1, the reactive silicone is selected as "polyether hydroxyl terminated polydimethylsiloxane", the types of isocyanates, catalysts, and modified silicon nanoparticles are changed and fine-tuned The amount of each raw material.

[0064] The present embodiment prepares a modified water-based polyurethane dipped glove, comprising the steps:

[0065] S1: 9 parts by mass of dehydrated polyether hydroxyl terminated polydimethylsiloxane and 35 parts by mass of polytrimethylene adipate polyol, 12 parts by mass of 1,6-hexamethylene diisocyanate and 0.5 parts by mass of dilauric acid Dibutyltin was added to the container, stirred evenly and reacted at 50°C for 2h, then added 2 parts by mass of 1,4-butanediol, continued to react at 50°C for 2h, then added 25 parts by mass of acetone to reduce viscosity, and added 0.5 part by mass Triethylamine was neutralized, and the reaction was continued at 60° C. for 1 h until the isocyanate group conte...

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