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Preparation method of waterborne polyurethane emulsion

A technology of water-based polyurethane and emulsion, which is applied in the direction of textiles, papermaking, fiber treatment, etc., and can solve the problem that the hydrophobicity of water-based polyurethane does not meet the requirements of the ideal hydrophobicity of coated fabrics.

Inactive Publication Date: 2018-03-20
SHAANXI ALLIANCE LOGISTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Castor oil-modified waterborne polyurethane does improve the water resistance and mechanical properties of polyurethane film, but the hydrophobicity of castor oil-modified waterborne polyurethane still does not meet the requirements of ideal hydrophobicity for coated fabrics

Method used

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Embodiment Construction

[0013] The preparation method of the water-based polyurethane emulsion according to the present invention comprises the following steps: (1) sequentially add 9.86g of isophorone isocyanate, 15g of polyether 210, 1.88g of castor oil and double-terminated hydroxyl poly For siloxane, stir well at 40°C and heat, add catalyst, and react for 2 hours; (2) Add DMPA, continue to react for 2 hours, then add BDOTMP, continue to react for 100 minutes and then cool down; (3) Add triethylamine for neutralization, and cool down to At 25°C, add 70 g of deionized water for emulsification, and vigorously stir to obtain a water-based polyurethane emulsion modified by castor oil and double-terminated hydroxyl polysiloxane.

[0014] In the preparation method of the aqueous polyurethane emulsion of the present invention, the four-necked round-bottomed flask in step (1) is provided with a thermometer and a stirrer. The heating temperature in step (1) is 70°C. The catalyst in step (1) is dibutyltin ...

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Abstract

The invention provides a preparation method of a waterborne polyurethane emulsion and belongs to the field of preparation of materials. The method is characterized by comprising the following steps: successively adding isophorone isocyanate, polyether 210, castor oil and double hydroxyl-terminated polysiloxane into a four-neck round-bottom flask, fully stirring and then heating, adding a catalystand reacting; adding DMPA(dimethylol propionic acid), continuously reacting, then adding BDOTMP, continuously reacting and then cooling; adding triethylamine for neutralizing, cooling, adding deionized water for emulsifying, and intensely stirring to obtain the waterborne polyurethane emulsion modified by castor oil and double hydroxyl-terminated polysiloxane. When the amount of double hydroxyl-terminated polysiloxane is increased, the particle size of the emulsion is increased; the distribution is broadened; the appearance of the emulsion is changed from transparent to milk white; the stability is reduced; the glue film water contact angle is increased; the water absorption rate is reduced; the tensile strength of the glue film is firstly increased and then reduced; the elongation at break is increased.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a preparation method of water-based polyurethane emulsion. Background technique [0002] Coating finishing is a surface finishing technology that evenly coats a layer of polymer compound that can form a film on the surface of the fabric, so that the front and back of the fabric have different functions. Coating not only improves the appearance and style of fabrics, but also a surface finishing technology that has different functions according to the front and back. The coating can not only improve the appearance and style of the fabric, but also give the coated fabric different functions according to the different uses of the fabric, such as waterproof, water pressure resistance, breathable and moisture permeable, flame retardant and antifouling, shading reflection and antistatic, UV protection And other functions, make the coated fabric multi-functional, increase the added v...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/67C08G18/65C08G18/61C08G18/48C08G18/34D06M15/647D06M15/568
CPCC08G18/348C08G18/48C08G18/61C08G18/6541C08G18/6705C08G18/755D06M15/568D06M15/647
Inventor 刘秋丽
Owner SHAANXI ALLIANCE LOGISTICS
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