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Preparation method and application of bio-based modified polyurethane resin

A polyurethane resin and bio-based technology, which is applied in the field of polyurethane resin preparation for synthetic leather, can solve problems such as weak bonding strength, and achieve the effect of improving easy delamination

Active Publication Date: 2020-10-02
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method and application of bio-based modified polyurethane resin to solve the problem of weak bonding strength between the water-based polyurethane resin surface layer and the solvent-free polyurethane resin intermediate layer in the prior art water-based solvent-free polyurethane synthetic leather. question

Method used

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  • Preparation method and application of bio-based modified polyurethane resin
  • Preparation method and application of bio-based modified polyurethane resin

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preparation example Construction

[0055] Such as figure 1 Shown, a kind of preparation method of bio-based modified polyurethane resin comprises the following steps:

[0056] (1), preparation of castor oil modified half ester:

[0057] Using maleic anhydride and castor oil as raw materials, add maleic anhydride and castor oil to the anti-vessel according to the molar ratio of 1.35:1-1.35:1.05 (the reaction of these two raw materials is basically an equimolar ratio reaction, and the numerical ratio range cannot be large) The reaction is carried out until the acid value detected in the reaction vessel is stable, and the bio-based modified half-ester is obtained, that is, the castor oil modified half-ester. The molecular structural formula of the prepared castor oil-modified half-ester is:

[0058]

[0059] In the molecular structural formula of castor oil modified half ester, The specific structure is

[0060]

[0061] (2), preparation of bio-based modified isocyanate B component:

[0062] Take by wei...

Embodiment 1

[0080] A preparation method of bio-based modified polyurethane resin, comprising the steps of:

[0081] (1) Preparation of bio-based modified half-esters

[0082] Add castor oil into the reaction bottle, dehydrate at 100°C and -0.095MPa for 2 hours, cool to 60°C, then add maleic anhydride at a molar ratio of 1.35 / 1, stir until all solids are dissolved, then heat up to 78°C for 6 hours until the detected acid value is basically stable, that is, the bio-based modified half-ester, ie castor oil-modified half-ester, is prepared. The hydroxyl value of the obtained castor oil modified half ester is 105mgKOH / g, and the acid value is 52.5mgKOH / g;

[0083] (2) Preparation of bio-based modified isocyanate B component

[0084]First, the temperature of the reaction flask is set to 55° C., and in parts by mass, 60 parts of carbodiimide modified MDI and 100 parts of castor oil modified half esters obtained in step (1) are added to the reaction flask, and the temperature is raised to Stir...

Embodiment 2

[0091] A preparation method of bio-based modified polyurethane resin, comprising the steps of:

[0092] (1) Preparation of bio-based modified half-esters

[0093] Add castor oil into the reaction bottle, dehydrate at 110°C and -0.09MPa for 3 hours, cool to 65°C, then add maleic anhydride at a molar ratio of 1.35 / 1.05, stir until all solids are dissolved, then heat up to 82°C for 4 hours , until the detected acid value is basically stable, and the bio-based modified half-ester, that is, the castor oil-modified half-ester, is prepared. The hydroxyl value of the castor oil modified half ester obtained is 106mgKOH / g, and the acid value is 53mgKOH / g;

[0094] (2) Preparation of bio-based modified isocyanate B component

[0095] First, the temperature of the reaction flask is set to 65° C., and in parts by mass, 84.5 parts of carbodiimide modified MDI and 100 parts of castor oil modified half esters prepared in step (1) are added to the reaction flask, and the temperature is raise...

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Abstract

The invention discloses a preparation method and application of bio-based modified polyurethane resin, comprising the following steps of: preparing bio-based modified semi-ester, and preparing a bio-based modified isocyanate component B and a water-based bio-based modified high-solid-content polyol component A; and fully reacting the water-based bio-based modified high-solid-content polyol component A with the bio-based modified isocyanate component B to obtain the bio-based modified polyurethane resin. The invention also discloses an application of the bio-based modified polyurethane resin mainly to bonding of a waterborne polyurethane resin surface layer and a solvent-free polyurethane resin middle layer in waterborne solvent-free polyurethane synthetic leather. The bonding capacity between the waterborne polyurethane resin surface layer and the solvent-free polyurethane resin middle layer is improved, the quality problems of false bonding, delaminating and the like caused by insufficient bonding strength between interfaces of the waterborne polyurethane resin surface layer and the solvent-free polyurethane resin middle layer are avoided, and the physical performance of a waterborne solvent-free polyurethane synthetic leather product is guaranteed.

Description

technical field [0001] The invention relates to the field of preparation methods of polyurethane resins for synthetic leather, in particular to a preparation method and application of bio-based modified polyurethane resins. Background technique [0002] In recent years, the polyurethane synthetic leather industry is facing transformation and upgrading, gradually transforming from traditional production and manufacturing technologies that are not environmentally friendly to more advanced and environmentally friendly production and manufacturing technologies. Due to the large proportion of organic solvents used in the traditional polyurethane synthetic leather manufacturing technology, new national and industrial policies, downstream customer requirements, and market demand have all raised different requirements for the organic solvents used in polyurethane synthetic leather. restrictive requirements. [0003] In order to satisfy different customers and cater to the market, p...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/67C08G18/76C08G18/32C08G18/12C07C67/08C07C69/732D06N3/14
CPCC07C67/08C08G18/12C08G18/3206C08G18/675C08G18/7671C08G18/797D06N3/145D06N3/147C07C69/732
Inventor 王海峰孔为青李晓飞姚克俭吴伟杰
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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