CN-122011915-A - Aqueous polyurethane slurry and preparation method and application thereof

Abstract

The invention provides aqueous polyurethane slurry and a preparation method and application thereof. The aqueous polyurethane slurry comprises base resin, a foaming foam stabilizer, filler, an aqueous thickener, an aqueous curing agent and amine compounds. The prepared aqueous slurry is subjected to high-speed stirring and physical foaming to obtain foaming slurry, the slurry is coated on a substrate, and the substrate is dried under the high-temperature condition to obtain the breathable water-absorbing aqueous synthetic leather base.

Inventors

• SUN XIAOPENG
• ZHANG BIN
• Lu Dapin
• YANG JIANQIANG
• YU LI

Assignees

• 万华化学集团股份有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (10)

1. 1. The aqueous polyurethane slurry is characterized by comprising the following components in parts by mass: 100 parts of base resin, 0.5-5 parts of amine compound, 0.3-2 parts of aqueous thickener, 0.3-2 parts of aqueous curing agent, 0-3 parts of aqueous color paste, 1-7 parts of foaming stabilizer and 10-60 parts of filler.
2. 2. The aqueous polyurethane slurry according to claim 1, wherein the base resin is a foamable resin type resin, preferably a polyether type aqueous polyurethane resin, more preferably having a solids content of 45-50wt%.
3. 3. The aqueous polyurethane slurry according to claim 1, wherein the amine compound is one or more of ammonia water, urea and ammonium bicarbonate, and preferably the concentration of ammonia water is 5-28wt%.
4. 4. The aqueous polyurethane slurry according to claim 1, wherein the aqueous thickener is an associative polyurethane thickener or an alkali swellable thickener, preferably an alkali swellable thickener.
5. 5. The aqueous polyurethane slurry of claim 1, wherein the aqueous curing agent is one or more of an isocyanate curing agent, a polycarbodiimide curing agent, and an aziridine curing agent.
6. 6. The aqueous polyurethane slurry according to claim 1, wherein the filler is a water-dispersible powder, preferably one or more of heavy calcium, fiber powder, light calcium.
7. 7. A method for preparing the aqueous polyurethane slurry according to any one of claims 1 to 6, wherein the preparation method comprises the step of uniformly mixing a base resin, a foaming foam stabilizer, an aqueous thickener, an aqueous curing agent, an amine compound, a filler and optionally aqueous color paste to obtain the aqueous polyurethane slurry.
8. 8. Use of the aqueous polyurethane slurry according to any one of claims 1 to 6 or the aqueous polyurethane slurry prepared by the preparation method according to claim 7 in the field of synthetic leather.
9. 9. The preparation method of the breathable water-absorbing water-based synthetic leather bass comprises the following steps: S1, foaming aqueous polyurethane slurry to obtain aqueous polyurethane foaming slurry; And S2, coating the waterborne polyurethane foaming slurry on a substrate, and drying to obtain the breathable and water-absorbing waterborne synthetic leather base.
10. 10. The method according to claim 9, wherein the density after foaming in step S1 is 300-800g/L, and/or the thickness of the slurry coating in step S2 is 0.3-0.7mm, and/or the drying temperature in step S2 is 90-120 ℃.

Description

Aqueous polyurethane slurry and preparation method and application thereof Technical Field The invention relates to the technical field of water-based synthetic leather, in particular to water-based polyurethane slurry, and a preparation method and application thereof. Background Recently, with the development of synthetic leather technology, synthetic leather products gradually start to replace precious products due to the characteristics of high cost performance and no damage to animals. At present, people live in various colors, and the performance requirements of people on synthetic leather are determined to be diversified, so that the synthetic leather is not limited to the directions of fastness, handfeel and the like, products with different performance characteristics are obtained, and the synthetic leather can be applied to various aspects of life. The Bass refers to an integral structure that a layer of PU is coated on the surface of the base cloth and no lines are formed on the surface after drying. The aqueous synthetic leather is greatly different from the solvent-type synthetic leather in technology. The solvent type synthetic leather foaming layer is formed by the replacement between water and solvent, and the water-based synthetic leather foaming layer is directly dried and formed. Therefore, the water-based paint has a development trend because no solvent pollution exists in the production process, but the performance characteristics are greatly different because of different production processes. The oily replacement process makes the foam cells of the foaming layer mostly open-cell type, and the directly dried aqueous foaming layer mostly closed-cell type, so that the air permeability of the aqueous foaming layer is poorer than that of the oily foaming layer, and the application of the aqueous foaming layer is also greatly limited. Patent CN201610375622.1 discloses a breathable synthetic leather and a preparation method thereof, the synthetic leather prepared by the method has good breathability, but the synthetic leather uses a solvent type preparation method, and the surface of the synthetic leather is polished after the bass is manufactured so as to further open pores on the surface of the bass. The production process not only causes pollution to the environment due to the solvent, but also increases the manufacturing cost and makes the manufacturing process more complex. Aiming at the situation that the existing waterborne synthetic leather bass has poor air permeability and narrow application surface, a new waterborne polyurethane slurry and a preparation method thereof are required to be developed, so that the application surface of the waterborne synthetic leather bass is improved, the application value of the waterborne synthetic leather bass is improved, the development of the waterborne synthetic leather is promoted, and the oily pollution is reduced. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide the aqueous polyurethane slurry and the preparation method thereof, and the aqueous synthetic leather prepared by the aqueous polyurethane slurry has good air permeability, and has certain water absorption property due to the pore opening effect, so that the use value of the aqueous synthetic leather product can be effectively improved. The invention also provides application of the aqueous polyurethane slurry in the field of synthetic leather. The invention realizes the aim through the following technical scheme: The invention discloses an aqueous polyurethane slurry, which comprises the following components in parts by mass: 100 parts of base resin, 0.5-5 parts of amine compound, 0.3-2 parts of aqueous thickener, 0.3-2 parts of aqueous curing agent, 0-3 parts of aqueous color paste, 1-7 parts of foaming stabilizer and 10-60 parts of filler. The base resin is foamable resin, preferably polyether aqueous polyurethane resin, and more preferably contains 45-50wt%; The amine compound is one or more of ammonia water (preferably 5-28 wt%), urea, ammonium bicarbonate and the like under the heating condition, and the heating condition is preferably 80-120 ℃; The water-based thickener is an associative polyurethane thickener or an alkali swelling thickener, preferably an alkali swelling thickener such as an acrylic acid-base swelling thickener; the water-based curing agent is one or more of isocyanate curing agent, polycarbodiimide curing agent and aziridine curing agent; The water-based color paste is water-dispersible color paste; the foaming foam stabilizer is a foam stabilizer commonly used in water-based synthetic leather, such as a water-based foam stabilizer and the like; The filler in the invention is one or more of water dispersible powder, such as hydrophilically modified heavy calcium carbonate, fiber powder, light calcium carbonate and the like. According to the second aspect of the invention, the preparation method of the aqueous poly