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A kind of heat-resistant hyperbranched polyurethane and preparation method thereof

A technology of hyperbranched polyurethane and heat resistance, applied in the field of hyperbranched polymers, can solve problems such as poor heat resistance of polyurethane, and achieve the effects of improving tensile strength, enhancing force, and easily obtaining raw materials

Active Publication Date: 2019-02-26
武汉仕全兴聚氨酯科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a kind of heat-resistant hyperbranched polyurethane and its preparation method, to solve the problem of poor heat resistance of existing polyurethane

Method used

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  • A kind of heat-resistant hyperbranched polyurethane and preparation method thereof
  • A kind of heat-resistant hyperbranched polyurethane and preparation method thereof

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preparation example Construction

[0012] The preparation method of heat-resistant hyperbranched polyurethane of the present invention may further comprise the steps:

[0013] Step (1): Dissolve diisocyanate (IPDI) in an aprotic solvent, and add it dropwise to polyester polyol (PCDL) under nitrogen atmosphere, and add a catalyst to it, and stir the reaction at a temperature of 60-80°C 2~4 hours, obtain polyurethane prepolymer (being A 2 monomer);

[0014] Step (2): the melamine (i.e. B 3 monomer) is dissolved in an organic solvent, mixed with the polyurethane prepolymer obtained in step (1), stirred and reacted for 2 to 24 hours at a temperature of 50 to 80° C., to obtain hyperbranched polyurethane, and the present invention is through A 2 +B 3 Direct polymerization to form hyperbranched polyurethane (HBPU).

[0015] In the above technical solution, in the step (1), the polyester polyol is vacuum dehydrated at a temperature of 120-130° C. for 1-2 hours, cooled to room temperature, and then added to the reac...

Embodiment 1

[0024] (1) Accurately weigh 10 g of polycarbonate diol (molecular weight: 1000) in a four-necked flask, and dehydrate it under vacuum with an oil pump for 2 hours at 130° C., then cool it down to room temperature;

[0025] (2) Mix 2.89g of isophorone isocyanate and 20mL of aprotic solvent, and add dropwise to step (1) under the condition of nitrogen protection, while adding dropwise 0.0258g of catalyst dibutyltin dilaurate, at a temperature of 80°C Down reaction is to obtain polyurethane prepolymer in 2 hours;

[0026] (3) Accurately weigh 0.924g melamine and dissolve it in 20mL dimethyl sulfoxide solvent, mix and react with the polyurethane prepolymer obtained in step (2), and react for 2 hours at a temperature of 80°C to obtain heat-resistant hyperbranched polyurethane .

Embodiment 2

[0028] (1) Accurately weigh 10 g of polybutylene adipate diol (molecular weight: 1000) in a four-necked flask, and at 120 ° C, use an oil pump to vacuum dehydrate for 1 hour and then drop to room temperature;

[0029] (2) Mix 3.3g of toluene diisocyanate and 20mL of aprotic solvent, and add it dropwise to step (1) under the condition of nitrogen protection. At the same time, add dropwise 0.0266g of catalyst dibutyltin dilaurate, and react at a temperature of 60°C Obtain polyurethane prepolymer for 4 hours;

[0030] (3) Accurately weigh 1.176g of melamine and dissolve it in 20mL of dimethyl sulfoxide solvent, mix and react with the polyurethane prepolymer obtained in step (2), react at a temperature of 50°C for 24 hours to obtain heat-resistant hyperbranched polyurethane .

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Abstract

The invention discloses a heat-resistant hyperbranched polyurethane and a preparation method thereof. The method comprises the following steps: (1) melting diisocyanate in an aprotic solvent, dropwisely adding polyester polyol in a nitrogen environment, adding a catalyst, and stirring at 60-80 DEG C to react for 2-4 hours, thereby obtaining a polyurethane prepolymer; and (2) dissolving melamine in an organic solvent, mixing with the polyurethane prepolymer obtained in the step (1), and stirring at 50-80 DEG C to react for 2-24 hours, thereby obtaining the hyperbranched polyurethane. The method can overcome the defect of poor heat resistance in the existing polyurethane, and has the advantages of simple synthesis process and low cost.

Description

technical field [0001] The invention relates to the technical field of hyperbranched polymers, in particular to a heat-resistant hyperbranched polyurethane and a preparation method thereof. Background technique [0002] Polyurethane (PU) is usually synthesized by stepwise polymerization of polyisocyanate constituting the hard segment and polyol constituting the soft segment. Due to its excellent corrosion resistance, wear resistance, good low-temperature elasticity, biocompatibility and other properties, it has been widely used in coatings, adhesives, elastomers, biomaterials and other fields. However, the heat resistance of PU is poor, and the use temperature generally does not exceed 80°C. Materials above 80°C will soften and even deform, resulting in a significant decline in mechanical properties, which seriously limits the application of PU in high temperature fields. Therefore, it is necessary to improve the resistance of PU. Thermal performance has become one of the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/44C08G18/42C08G18/10C08G18/32
CPCC08G18/10C08G18/4238C08G18/44C08G18/3851
Inventor 易昌凤田军张博晓肖利吉李庚茜
Owner 武汉仕全兴聚氨酯科技有限公司
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