Polyurethane emulsion, preparation method thereof and glass fiber sizing agent

A technology of polyurethane emulsion and polyurethane prepolymer, which is applied in the field of glass fiber sizing agent and polyurethane emulsion, which can solve the problems of sizing agent failure, non-use, and polyurethane emulsion breaking, so as to meet the needs of high-speed wire drawing process and prevent friction Good effect on damage, high elasticity

Active Publication Date: 2015-04-08
CHONGQING POLYCOMP INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the existing polyurethane emulsion has poor stability. When the glass fiber sizing is prepared, the polyurethane emulsion is prone to demulsification, causing the sizing to settle, agglomerate, etc., and finally the sizing fails and cannot be used again.

Method used

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  • Polyurethane emulsion, preparation method thereof and glass fiber sizing agent
  • Polyurethane emulsion, preparation method thereof and glass fiber sizing agent
  • Polyurethane emulsion, preparation method thereof and glass fiber sizing agent

Examples

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preparation example Construction

[0044] The present invention also provides a kind of preparation method of polyurethane emulsion, comprises the following steps:

[0045] A) In terms of mass fraction, mix 25-40% of polyester diol, 10-30% of polyether diol and 2-10% of small molecule diol to obtain a mixture; the small molecule diol Alcohols include one or more of butanediol, hexanediol, neopentyl glycol, propylene glycol, cyclohexanedimethanol and ethylene glycol;

[0046] B) Mixing 30-45% of the aliphatic isocyanate with the mixture obtained in the step A) in terms of mass fraction, and then synthesizing to obtain a polyurethane prepolymer;

[0047] C) In terms of mass fraction, water is mixed with the polyurethane prepolymer obtained in the step B), and emulsified to obtain an emulsified product;

[0048] D) Mixing 2-10% of the amine chain extender with the emulsified product in the step C) in terms of mass fraction to obtain a polyurethane emulsion.

[0049] In terms of mass fraction, the present inventi...

Embodiment 1

[0081] Add 30g of polyethylene glycol, 83.62g of polyneopentyl adipate, and 7.54g of butanediol into the reaction kettle, raise the temperature to 100°C to melt the raw materials, and then vacuumize for 1 hour. N 2 , lower the temperature to 70°C. Weigh 78.85g of isophorone diisocyanate, add it dropwise in the reactor within 1 hour, and control the temperature of the reactor at 70-75°C; take a sample to test that the isocyanate content of the resin reaches the theoretical value (isocyanate index When R is 1.2 to 2.4), a polyurethane prepolymer is obtained.

[0082] Put the polyurethane prepolymer into the shear emulsification tank, add 10g of methylpyrrolidone, cool down to 45°C; increase the shear stirring rate to 800HZ, add 50g of deionized water to the polyurethane prepolymer within 10 minutes; the system appears At the conversion point, keep stirring for 30 minutes, continue to add water, add 400g of deionized water into the shear emulsification tank within 30 minutes, a...

Embodiment 2

[0090] Add 30g of polyethylene glycol, 99.81g of polyneopentyl glycol adipate, and 8.99g of butanediol into the reaction kettle, heat up to 100°C to melt the raw materials, and then vacuumize for 1 hour. N 2 , lower the temperature to 75°C. Weigh 61.20 g of isophorone diisocyanate, add it dropwise in the reactor within 1 hour, and control the temperature of the reactor at 70 to 75° C.; take samples to test that the isocyanate content of the resin reaches the theoretical value (isocyanate index When R is 1.2 to 2.4), a polyurethane prepolymer is obtained.

[0091] Put the polyurethane prepolymer into the shearing emulsification tank, add 10g of methylpyrrolidone, cool down to 45°C; increase the shear stirring rate to 800HZ, add 40g of deionized water to the polyurethane prepolymer within 10 minutes; the system appears transformation point, keep stirring for 30 minutes, continue to add water, add 450g of deionized water into the emulsification shear tank within 30 minutes, and...

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Abstract

The invention provides a polyurethane emulsion. The polyurethane emulsion is prepared from the following components in percentage by weight: 25-40 percent of polyester diol, 10-30 percent of polyether glycol, 2-10 percent of micromolecular diol, 30-40 percent of aliphatic diisocyanate, 2-10 percent of an amine chain extender and 0-6 percent of a solvent, wherein the micromolecular dihydric alcohol is prepared from dihydric alcohol with the number of carbon atoms being 2-10. The polyurethane emulsion is good in stability and is a nonionic polyurethane emulsion. When being used for preparing a glass fiber sizing agent, the polyurethane emulsion can not generate mutual action with ions ionized from other components of the sizing agent, so that the polyurethane emulsion is prevented from generating demulsifcation, the phenomena of sedimentation and caking of the sizing agent are prevented, and the obtained glass fiber sizing agent is good in stability. The invention provides a preparation method of the polyurethane emulsion and the glass fiber sizing agent.

Description

technical field [0001] The invention belongs to the technical field of glass fiber production, and in particular relates to a polyurethane emulsion, a preparation method thereof and a glass fiber sizing agent. Background technique [0002] Glass fiber is a kind of reinforced material, which has excellent properties such as high strength, low expansion, corrosion resistance, electrical insulation, and non-combustibility. Glass fiber has become a must for construction, transportation, electronics, electrical, chemical, metallurgy, environmental protection, national defense and other industries. As an indispensable raw material, glass fiber has been paid more and more attention due to its wide application in many fields. [0003] However, glass fiber also has certain disadvantages, such as glass fiber is brittle, not wear-resistant, easily charged with static electricity after friction, poor processability, and poor adhesion to resin when used as a reinforcing material for resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/42C08G18/44C08G18/48C08G18/32C08G18/12C03C25/32C08J5/08C08L77/06C08L77/02C08K9/10C08K7/14
CPCC03C25/326C08G18/12C08G18/4018C08G18/4238C08G18/4833C08G18/6607C08G18/6618C08G18/755C08J5/08C08J2377/02C08J2377/06C08K7/14C08K9/04C08G18/3228C08L77/02C08L77/06
Inventor 王洲一龙浩
Owner CHONGQING POLYCOMP INT
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