Preparing method of acrylate modified waterborne polyurethane emulsion for synthetic leather

A water-based polyurethane and acrylate technology, used in textiles and papermaking, etc., can solve the problems of poor double bond activity and difficult reaction control, and achieve the effects of soft hand feeling, good process implementation and easy realization.

Inactive Publication Date: 2015-09-23
郭小曼
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activity of the double bond in the water-based double bond-terminated polyureth...

Method used

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preparation example Construction

[0017] A kind of preparation method of acrylate-modified aqueous polyurethane emulsion for synthetic leather, described preparation method comprises the following steps:

[0018] (1) React 2~3mol of diisocyanate and 1~2mol of polybutadiene diol at a temperature of 70~100°C and under the protection of argon for 3~5h to obtain a polyurethane prepolymer;

[0019] (2) Add 0.5~1.2mol of neopentyl glycol and 2~5mol of acrylic acid monomer to the reaction solution obtained in (1), and react for 5 ~8h, obtain polyurethane prepolymer;

[0020] (3) The reaction solution obtained in (2) is cooled to room temperature, and a pH regulator is added for neutralization, and deionized water is added for emulsification at the same time to obtain a water-based polyurethane emulsion;

[0021] (4) Add 0.5~1mol initiator to the emulsion obtained in (3), and react for 5~8h at a temperature of 70~100°C under the protection of argon to obtain acrylate-modified waterborne polyurethane lotion.

[0022...

Embodiment 1

[0024] The preparation steps of acrylate-modified water-based polyurethane emulsion are as follows:

[0025] (1) React 3 mol of isophorone diisocyanate and 2 mol of polybutadiene diol at a temperature of 100°C under the protection of argon for 3 to 5 hours to obtain a polyurethane prepolymer;

[0026] (2) Add 1.2mol of neopentyl glycol and 5mol of n-butyl acrylate to the reaction solution obtained in (1), and react for 8 hours at a temperature of 100°C under the protection of argon to obtain a polyurethane prepolymer body;

[0027] (3) Cool down the reaction liquid obtained in (2) to room temperature, add NaCO 3 Neutralize, and add deionized water to emulsify at the same time to obtain a water-based polyurethane emulsion;

[0028] (4) Add 1 mol of initiator to the emulsion obtained in (3), and react for 8 hours at a temperature of 100° C. under the protection of argon to obtain an acrylate-modified water-based polyurethane emulsion.

Embodiment 2

[0030] The preparation steps of acrylate-modified water-based polyurethane emulsion are as follows:

[0031] (1) React 2 mol of 2,6-toluene diisocyanate and 1 mol of polybutadiene diol at a temperature of 70°C and under the protection of argon for 3 hours to obtain a polyurethane prepolymer;

[0032] (2) Add 0.5 mol of neopentyl glycol and 2 mol of hydroxyethyl methacrylate to the reaction solution obtained in (1), and react for 5 hours at a temperature of 70°C under the protection of argon to obtain polyurethane Prepolymer;

[0033] (3) Cool the reaction solution obtained in (2) to room temperature, add NaOH for neutralization, and add deionized water for emulsification at the same time to obtain a water-based polyurethane emulsion;

[0034] (4) Add 0.5 mol of initiator to the emulsion obtained in (3), and react for 5 hours at a temperature of 70° C. under the protection of argon to obtain an acrylate-modified water-based polyurethane emulsion.

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Abstract

The invention discloses a preparing method of acrylate modified waterborne polyurethane emulsion for synthetic leather. According to the method, active double-bond acrylate modified waterborne polyurethane is introduced to main chains, polybutadiene dihydric alcohol is used as chain extender, active double-bonds are introduced to the polyurethane molecule main chains, the polyurethane molecule main chains are connected through acrylate monomers via double-bond polymerization, and then the acrylate modified waterborne polyurethane emulsion is compounded. The preparing method is simple in technology and easy to realize, and good technology implementation is achieved. The synthetic leather prepared through the method is soft in hand feeling, good in cold tolerance and water resistance and superior in knurling effect, and has wide application prospects in the synthetic leather industry.

Description

technical field [0001] The invention relates to the technical field of synthetic leather materials, in particular to a method for preparing an acrylate-modified water-based polyurethane emulsion for synthetic leather. Background technique [0002] Water-based polyurethane has high tensile strength and impact strength and excellent wear resistance, but water-based polyurethane has many hydrophilic groups, so it has poor water resistance and high cost. The coatings based on acrylate resins have the advantages of gloss retention, color retention, weather resistance, and strong adhesion, but they also have disadvantages such as poor solvent resistance, hot stickiness, and cold brittleness. Water-based polyurethane and polyacrylate have certain complementarity in nature, and their comprehensive advantages can be exerted through compounding. [0003] However, the current acrylate-modified water-based polyurethane mainly uses the synthesized water-based double-bond-terminated poly...

Claims

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Application Information

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IPC IPC(8): D06N3/14C08G18/76C08G18/75C08G18/10C08G18/69C08G18/67C08G18/32
Inventor 郭小曼
Owner 郭小曼
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