Aqueous dispersion of polyurethane or polyurethane urea, preparation method of aqueous dispersion, aqueous space leather base and preparation method of aqueous space leather base

A technology of polyurethane urea and polyurethane, which is applied in the field of space leather basses, can solve the problems of uneven distribution, less urea group content, and no coupling agent, etc., and achieve the effects of excellent flex resistance, enhanced strength, and improved peel strength

Active Publication Date: 2021-12-17
WANHUA CHEM GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent document CN 106947048 A discloses a method for preparing water-based polyurethane used for preparing water-based garment leather bases, using large molecular weight polyether polyols and introducing large molecular weight polyether amines through post-chain extension for post-chain extension. This method results in less urea group content and uneven distribution in the molecular chain of the product, and does not add a coupling agent for modification to improve performance; therefore, although the obtained garment leather is soft to the touch and has a good resin flocculation effect, it can only Used to prepare garment leather bases with lower peel strength requirements
[0007] Patent document CN 105566608 B discloses a water-based polyurethane emulsion used for soaking basses in sofa leather, which is modified by adding a silane coupling agent, but it is a post-reaction coupling agent, which exists at the end of the product molecular segment, and there will be There is no coupling agent problem in the long molecular chain segment, and the performance of the product is limited

Method used

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  • Aqueous dispersion of polyurethane or polyurethane urea, preparation method of aqueous dispersion, aqueous space leather base and preparation method of aqueous space leather base
  • Aqueous dispersion of polyurethane or polyurethane urea, preparation method of aqueous dispersion, aqueous space leather base and preparation method of aqueous space leather base
  • Aqueous dispersion of polyurethane or polyurethane urea, preparation method of aqueous dispersion, aqueous space leather base and preparation method of aqueous space leather base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] Preparation of aqueous dispersions of polyurethane or polyurethane urea:

[0112] 1) Add 190g of polytetrahydrofuran ether polyol, 83g of 4,4'-dicyclohexylmethane diisocyanate, 3.5g of DMPA, 2g of Ymer N-120, 0.03g of bismuth neodecanoate and 27.75g of acetone Mix in a four-necked round-bottom flask with a nitrogen inlet and outlet with a volume of 1L for reaction, and react at 60-90°C until the reaction mixture has reached or slightly lower than the theoretical isocyanate content of 5.2%, and the prepolymerization of terminal isocyanate is obtained. thing I;

[0113] 2) Cool down the system containing the obtained isocyanate-terminated prepolymer I to 45-50°C, add 9g of [4-(aminomethyl)cyclohexyl]methanol, 5g of 1,11-bis(trimethoxysilyl) )-4-oxo-8-azaundecan-6-ol and 42.36g of acetone were mixed uniformly, and the chain extension reaction was carried out at 60-80°C until the reaction mixture reached or slightly lower than the theoretical isocyanate content of 2.64%. ...

Embodiment 2

[0120] Preparation of aqueous dispersions of polyurethane or polyurethane urea:

[0121]1) Add 262g of polytetrahydrofuran ether polyol, 143g of 4,4'-dicyclohexylmethane diisocyanate, 6.5g of DMPA, 4g of Ymer N-120, 0.1g of bismuth neodecanoate and 42.25g of acetone Mix in a four-neck round-bottomed flask with a volume of 1L equipped with nitrogen inlet and outlet, and react at 60-90°C until the reaction mixture has reached or slightly lower than the theoretical isocyanate content of 6.61%, and the prepolymerization of terminal isocyanate is obtained. thing I;

[0122] 2) Cool down the system containing the obtained isocyanate-terminated prepolymer I to 45-50°C, add 20g of [4-(aminomethyl)cyclohexyl]methanol, 10g of 1,11-bis(trimethoxysilyl) )-4-oxo-8-azaundecan-6-ol and 65.03g of acetone were mixed evenly, and the chain extension reaction was carried out at 60-80°C until the reaction mixture reached or slightly lower than the theoretical isocyanate content of 2.98%. Obtain ...

Embodiment 3

[0129] Preparation of aqueous dispersions of polyurethane or polyurethane urea:

[0130] 1) Add 252g of polytetrahydrofuran ether polyol, 125.6g of 4,4'-dicyclohexylmethane diisocyanate, 5g of DMPA, 4g of Ymer N-120, 0.03g of bismuth neodecanoate and 39.4g of acetone Mix in a four-neck round-bottomed flask with a volume of 1L equipped with nitrogen inlet and outlet, and react at 60-90°C until the reaction mixture has reached or slightly lower than the theoretical isocyanate content of 6.12%, and the prepolymerization of terminal isocyanate is obtained. thing I;

[0131] 2) Cool down the system containing the obtained isocyanate-terminated prepolymer I to 45-50°C, add 16g of [4-(aminomethyl)cyclohexyl]methanol, 8g of 1,11-bis(trimethoxysilyl) )-4-oxo-8-azaundecan-6-ol and 60.6g of acetone were mixed evenly, and the chain extension reaction was carried out at 60-80°C until the reaction mixture reached or slightly lower than the theoretical isocyanate content of 2.95%. Obtain i...

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Abstract

The invention belongs to the technical field of space leather bass, and particularly relates to an aqueous dispersion of polyurethane or polyurethane urea, a preparation method of the aqueous dispersion, a water-based space leather bass and a preparation method of the water-based space leather bass. Polyurethane or polyurethane polyurea contained in the aqueous dispersion is prepared from the following components: (a) dihydric alcohol and / or polyhydric alcohol; (b) diisocyanate and / or polyisocyanate; (c) a hydrophilic compound comprising ionic and / or latent ionic groups and comprising 2-3 NCO reactive functional groups; (d) a nonionic hydrophilic compound; (e) a cyclic compound reactive to isocyanates and comprising hydroxyl and amino functional groups; (f) a silane coupling agent comprising hydroxyl and amino functional groups; (g) a neutralizing agent; and (h) a small molecule compound containing an amino group. The obtained aqueous dispersion is high in flocculation speed, good in flocculation effect and good in storage stability. The obtained space leather base is high in peel strength and excellent in normal and low temperature flexure resistance and chemical resistance.

Description

technical field [0001] The invention belongs to the technical field of space leather base, and in particular relates to an aqueous dispersion of polyurethane or polyurethane urea and a preparation method thereof, water-based space leather base and a preparation method thereof. Background technique [0002] Synthetic leather is a plastic product that simulates the composition and structure of natural leather and can be used as its substitute material. Synthetic leather occupies a very important position in human's daily life and is widely used in the production of luggage, clothing, footwear and car interior accessories. [0003] Space leather is a synthetic leather product developed in recent years. It is mainly made of a non-woven fabric coated with a layer of slurry. It is characterized by being able to preserve the air permeability and moisture permeability of the leather itself to a great extent. , And this is also the performance that ordinary synthetic leather does no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/34C08G18/12C08G18/32D06N3/00D06N3/14
CPCC08G18/758C08G18/6692C08G18/4854C08G18/348C08G18/12D06N3/146D06N3/147D06N3/005D06N3/0011D06N3/0077D06N2209/1664D06N2211/28C08G18/3271C08G18/3893C08G18/3234
Inventor 朱文辉王震孙小鹏邢庆达韩克晋云全纪学顺
Owner WANHUA CHEM GRP CO LTD
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