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Preparation method of self-extinction waterborne polyurethane dispersoid

A water-based polyurethane and dispersion technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of impermeable coatings and affecting the decorative effect of the bottom layer, and achieve reduced gloss, delicate touch, and good hydrolysis weather resistance Effect

Inactive Publication Date: 2020-07-17
福建华夏蓝新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the self-dulling resin prepared by the above method has good stability and self-dulling performance, the coating is not transparent and has a certain covering power to the bottom layer, which affects the decorative effect of the bottom layer.

Method used

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  • Preparation method of self-extinction waterborne polyurethane dispersoid
  • Preparation method of self-extinction waterborne polyurethane dispersoid

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preparation example Construction

[0015] The invention provides a kind of preparation method of self-dulling aqueous polyurethane dispersion, comprises the following steps:

[0016] Step 1. In molar parts, mix 0.04-0.3 parts of diol, 0.5-1.6 parts of crystalline compound and 1.3-2.7 parts of amorphous compound, and add 2.1-5.3 parts of polyisocyanate after the reaction. Obtain isocyanate prepolymer;

[0017] Step 2. Add the solvent to the isocyanate prepolymer obtained in Step 1, then drop in 0.04-0.36 parts of hydrophilic chain extender, add water dropwise, and distill the solvent under reduced pressure at the same time, and disperse to obtain a water-based polyurethane compound;

[0018] Step 3, adding a neutralizer dropwise to the water-based polyurethane compound obtained in step 2 until the pH is 6-9, and adding water to a solid content of 45-55%, to obtain a self-dulling water-based polyurethane dispersion.

[0019] It can be seen from the above description that the beneficial effect of the present inve...

Embodiment 1

[0034] The preparation method of self-dulling aqueous polyurethane dispersion specifically comprises the following steps:

[0035] Step 1, 0.04mol of ethylene glycol, 1.6mol of HO-PS-OH (number average molecular weight Mn=3700, molecular weight distribution D=1.3) and 2.7mol of HO-PB-OH (number average molecular weight Mn=3000, Molecular weight distribution D=1.9) was added to the reaction kettle, heated to 110°C, vacuumed to remove moisture until the weight ratio of moisture was 0.08%, cooled to 40°C, then added polyisocyanate, and heated to 85°C, after 4 hours of reaction Cool down to 40°C to obtain isocyanate prepolymer;

[0036] Step 2. Add methyl ethyl ketone to the isocyanate prepolymer obtained in step 1, raise the temperature to 50°C, then drop in 0.16mol of hydrazine hydrate, react for 1h and cool down to 35°C, then add 12kg of water dropwise, and reduce the solvent while heating Distilled out under high pressure, using mechanical agitation to disperse strongly to ob...

Embodiment 2

[0039] The preparation method of self-dulling aqueous polyurethane dispersion specifically comprises the following steps:

[0040] Step 1, 0.3mol of hexanediol, 1.06mol of HO-PE-OH (number average molecular weight Mn=2800, molecular weight distribution D=1.04) and 1.94mol of HO-EPR-OH (number average molecular weight Mn=4200, Molecular weight distribution D=1.89) was added to the reactor, heated to 150°C, vacuumed to remove moisture until the weight ratio of moisture was 0.05%, cooled to 48°C, then added 3.5mol of IPDI, and heated to 95°C, reacted After 1.5 hours, the temperature was lowered to 40°C to obtain an isocyanate prepolymer;

[0041] Step 2. Add acetone to the isocyanate prepolymer obtained in step 1, raise the temperature to 55°C, then drop in 0.2mol of DMPA, react for 2 hours and then cool down to 40°C, then add 13kg of water dropwise, and distill the solvent under reduced pressure while heating up Come out, and use mechanical stirring to disperse strongly to obta...

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Abstract

The invention discloses a preparation method of a self-extinction waterborne polyurethane dispersoid, and belongs to the technical field of high polymer materials, wherein the preparation method comprises the steps: in parts by mole, mixing 0.04-0.3 part of dihydric alcohol, 0.5-1.6 parts of a crystalline compound and 1.3-2.7 parts of an amorphous compound for reaction, and then adding 2.1-5.3 parts of polyisocyanate; and adding a solvent and 0.04-0.36 part of a hydrophilic chain extender after the reaction, and adding a neutralizer after the reaction to obtain the self-extinction waterborne polyurethane dispersoid. The self-extinction waterborne polyurethane dispersoid prepared by the preparation method is used and dried; a crystalline chain segment provides certain tensile strength for acoating layer, and an amorphous chain segment provides flexibility, so that the obtained coating layer has a uniformly distributed uneven surface, generates obvious scattering on incident light, greatly reduces the glossiness, does not contain ester groups easy to hydrolyze, and is good in hydrolysis weather resistance and fine and smooth in touch.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a self-dulling aqueous polyurethane dispersion. Background technique [0002] In recent years, with the improvement of people's living standards, people pay more and more attention to high-quality aesthetics and fashion, and some high-end materials such as synthetic leather can be seen everywhere in life. Low-gloss synthetic leather is highly sought after for its soft color, strong texture, and elegant and comfortable feel. A matting leather finish is usually used to form a uniform and dense low-gloss coating on the leather surface to achieve a matting effect. At present, the most common way to prepare low-gloss coatings is to add matting agents. During the drying process of the coating film, the matting agent particles are supported on the surface of the coating film to form a rough surface, which scatters light and reduces the glo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/69C08G18/65C08G18/62C08G18/32C08G18/12C09D175/14
CPCC08G18/12C08G18/3231C08G18/3281C08G18/62C08G18/6535C08G18/698C09D175/14
Inventor 邱元进饶长贵陈国栋
Owner 福建华夏蓝新材料科技有限公司
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