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A kind of low-modulus solvent-free polyurethane resin for synthetic leather and preparation method thereof

A solvent-free polyurethane, low-modulus technology, applied in the field of polyurethane materials, can solve the problems of sealing agent and a small amount of solvent discharge, pollution of the environment, etc., and achieve the effects of improving melt fluidity, good soft hand, and increased strength

Active Publication Date: 2022-01-28
SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent CN108484873A discloses a high-solid-content sealed polyurethane resin for synthetic leather, which has a long operating time, but still produces sealing agents and a small amount of solvent emissions, polluting the environment

Method used

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  • A kind of low-modulus solvent-free polyurethane resin for synthetic leather and preparation method thereof
  • A kind of low-modulus solvent-free polyurethane resin for synthetic leather and preparation method thereof
  • A kind of low-modulus solvent-free polyurethane resin for synthetic leather and preparation method thereof

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preparation example Construction

[0064] A second aspect of the present invention provides the preparation method of the above-mentioned low modulus solvent-free polyurethane resin, comprising the steps of:

[0065] (1) Add polyether polyol, polyester polyol and additives into the reaction kettle according to the proportion, stir and mix at 50-60°C;

[0066] (2) Put the diisocyanate into the above-mentioned reaction kettle in batches, the reaction temperature is between 65-120°C, and after 2-8 hours of normal pressure reaction, when the NCO content is lower than the theoretical value, cool down to 60°C, drop Glycerol carbonate, after the dropwise addition, continues to react at 75-80°C until the NCO content in the system drops to zero, and the product is obtained after discharge.

[0067]The glycerol carbonate in the present invention adjusts the dropping rate according to specific circumstances, and can be slowly added dropwise in order to make the reaction stable. Measure the NCO content every half an hour ...

Embodiment 1

[0074] Example 1 : This embodiment provides a kind of low modulus solvent-free polyurethane resin, and its preparation raw material comprises (unit: gram):

[0075]

[0076] Wherein said diisocyanate is toluene diisocyanate; said polyether polyol is polyoxypropylene / oxyethylene copolytriol (number average molecular weight 3000).

[0077] The preparation method of above-mentioned low modulus solvent-free polyurethane resin comprises the steps:

[0078] (1) 750g polyoxypropylene / oxyethylene copolytriol and 0.5g antioxidant 1010 are put into the reactor, and stirred evenly at 50°C;

[0079] (2) Put 130.5g of toluene diisocyanate into the reaction kettle, strictly control the reaction temperature between 75-80°C, and after 5 hours of normal pressure reaction, take samples to measure the NCO content every half hour, and stop when the NCO content is lower than 3.5%. Heat, cool down to 60°C, slowly add 88.5g of glycerol carbonate dropwise, after the dropwise addition, continue t...

Embodiment 2

[0080] Example 2 : This embodiment provides a kind of low modulus solvent-free polyurethane resin, and its preparation raw material comprises (unit: gram):

[0081]

[0082] Wherein said diisocyanate is diphenylmethane 4,4-diisocyanate; Said polyether polyol consists of 450g polyoxypropylene / oxyethylene copolytriol (number average molecular weight 3000) and 225g polyoxyethylene diol (number average Molecular weight 2000) composition.

[0083] The preparation method of above-mentioned low modulus solvent-free polyurethane resin comprises the steps:

[0084] The preparation steps of the low modulus solvent-free polyurethane resin for synthetic leather of the present embodiment are as follows:

[0085] (1) Put 450g polyoxypropylene / oxyethylene copolytriol, 225g polyoxyethylene diol, 0.5g antioxidant 1010 into the reaction kettle, stir evenly at 50°C;

[0086] (2) Put 168.9g of diphenylmethane 4,4-diisocyanate into the reactor, strictly control the reaction temperature betw...

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Abstract

The invention relates to the technical field of polyurethane materials, in particular to a low-modulus solvent-free polyurethane resin for synthetic leather and a preparation method thereof. The raw materials for its preparation, in parts by weight, include: 37-78 polyether polyols, 0-39 polyester polyols, 13-21 diisocyanates, 7-10 glycerol carbonate, and 0.05-1 additives; the polyether The ratio of the total moles of hydroxyl groups in the polyol and polyester polyol structure to the total moles of NCO groups in the diisocyanate structure is 1: (1.6-2.1). The invention provides a scheme for preparing environment-friendly polyurethane resin by utilizing glycerol carbonate. The obtained low-modulus solvent-free polyurethane resin for synthetic leather has moderate viscosity and does not contain solvent, and glycerol carbonate is a bio-based chemical, which is truly green and environment-friendly; After the resin is cross-linked and cured, there are no urea bonds in the polymer molecules, and the polar bonds are all urethane bonds. It is especially suitable for the preparation of low-modulus polyurethane resins for leather making, with soft hand feeling and excellent folding resistance.

Description

technical field [0001] The invention relates to the technical field of polyurethane materials, in particular to a low-modulus solvent-free polyurethane resin for synthetic leather and a preparation method thereof. Background technique [0002] Biodiesel and oleochemical sectors produce a large amount of glycerin by-products, how to use glycerin to produce high value-added products has become a research and development hotspot at home and abroad. Glycerol carbonate is a derivative of glycerin, has two active functional groups, carbonyl and hydroxyl, and is easy to react with other compounds. It can modify many polymers and is widely used in adhesives, coatings, cosmetics and other fine chemicals industries. However, there are basically no reports on the application of glycerol carbonate in the leather industry. [0003] At present, the resins used for synthetic leather are mainly solvent-based polyurethane resins. During the production process, a large amount of solvents suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/48C08G18/42C08G18/40C08G18/30D06N3/14
CPCC08G18/7614C08G18/7671C08G18/755C08G18/758C08G18/4837C08G18/4833C08G18/4812C08G18/4238C08G18/4018C08G18/284D06N3/146D06N3/147D06N3/148
Inventor 卢亚伟顾佳佳王传勇蒋红梅唐劲松
Owner SHANGHAI HUAFON NEW MATERIAL R&D TECH CO LTD
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