A kind of preparation method of anti-mildew polyurethane prepolymer

A polyurethane prepolymer and anti-mildew technology, applied in the field of polyurethane, can solve the problems of poor storage stability, waste and loss of raw materials, and achieve good anti-mildew performance

Active Publication Date: 2019-01-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous increase of the amount of polyurethane, its limitations in the storage process are becoming increasingly apparent. Many polyurethane

Method used

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  • A kind of preparation method of anti-mildew polyurethane prepolymer
  • A kind of preparation method of anti-mildew polyurethane prepolymer
  • A kind of preparation method of anti-mildew polyurethane prepolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A kind of preparation method of anti-mildew polyurethane prepolymer, comprises the steps:

[0036] 1) In terms of parts by mass, add 60 parts of polyether diol (PPG-8000) with a relative molecular weight of 8000 and 20 parts of polyether triol (PPG-5000) with a relative molecular weight of 5000 into the reaction kettle , vacuumize, control the temperature at 120°C, and stir for 2 hours;

[0037] 2) In terms of parts by mass, under the protection of nitrogen, the system was cooled to 42°C, 30 parts of diphenylmethane diisocyanate (MDI) was added to the reaction kettle, 0.1 part of dibutyltin dilaurate was added, and The maximum stirring speed is 300rpm / min, and the temperature is controlled at 80°C for 3 hours;

[0038] 3) In terms of parts by mass, add 0.13 parts of silane coupling agent KH-550 to the reaction system, continue to stir, and react for 2 hours;

[0039] 4) In terms of parts by mass, add 0.01 part of 3-hydroxymethylthiophene to the system, continue stirri...

Embodiment 2

[0045] A kind of preparation method of anti-mildew polyurethane prepolymer, comprises the steps:

[0046] 1) In terms of parts by mass, add 60 parts of polyether diol (PPG-1000) with a relative molecular weight of 1000 and 20 parts of polyether triol (PPG-3000) with a relative molecular weight of 3000 into the reaction kettle , vacuumize, control the temperature at 120°C, and stir for 2.5 hours;

[0047] 2) In terms of parts by mass, under the protection of nitrogen, the temperature of the system was lowered to 40°C, 30 parts of diphenylmethane diisocyanate (MDI) was added to the reaction kettle, 0.1 part of dibutyltin dilaurate was added, and The maximum stirring speed is 300rpm / min, and the temperature is controlled at 80°C for 3 hours;

[0048]3) In terms of parts by mass, add 0.12 parts of silane coupling agent KH-550 to the reaction system, continue to stir, and react for 2 hours;

[0049] 4) In terms of parts by mass, add 0.5 parts of 3-hydroxymethyl-trithiophene to th...

Embodiment 3

[0053] A kind of preparation method of anti-mildew polyurethane prepolymer, comprises the steps:

[0054] 1) In terms of parts by mass, add 54 parts of polyether diol (PPG-4000) with a relative molecular weight of 4000 and 30 parts of polyether triol (PPG-5000) with a relative molecular weight of 5000 into the reactor, Vacuumize, control the temperature at 120°C, and stir for 2 hours;

[0055] 2) In terms of parts by mass, under the protection of nitrogen gas, the system was cooled to 45°C, 36 parts of isophorone diisocyanate (IPDI) was added to the reaction kettle, 0.2 parts of dibutyltin dilaurate was added, and The maximum stirring speed is 300rpm / min, and the temperature is controlled at 75°C for 3.5 hours;

[0056] 3) In terms of parts by mass, the amount of silane coupling agent KH-170 added to the reaction system is 0.26 g, and the stirring is continued for 3 hours;

[0057] 4) In terms of parts by mass, add 1 part of 3-hydroxythiophene to the system, continue to stir...

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Abstract

The invention discloses a preparation method of a mildew-resistant polyurethane prepolymer. The preparation method comprises the following steps: 1) adding polyether polyol to a reaction vessel, performing vacuum-pumping, controlling the temperature and performing stirring with a stirrer; 2) in the protection of nitrogen, cooling the system, adding diisocyanate and a proper amount of a catalyst, controlling the temperature, and increasing the stirring speed; 4) according the NCO content in the system, slowing adding a silane coupling agent to the reaction system, and continuously performing stirring; 5) adding a certain amount of hydroxyl (or amino) thiophene oligopolymer to the system, and continuously performing stirring; and 6) after the reaction is over, vacuumizing the system to remove bubbles and obtaining a target product. The obtained polyurethane prepolymer is excellent in mildew resistance without mechanical property being affected.

Description

technical field [0001] The invention relates to a polyurethane, in particular to a method for preparing a mildew-resistant polyurethane prepolymer. Background technique [0002] Due to its good elasticity, low temperature resistance, wear resistance and good adhesion to substrates, polyurethane has broad application prospects in the fields of construction, transportation and automobile manufacturing. With the rapid development of my country's economy, the domestic demand for polyurethane continues to increase. Among them, the largest consumption of polyurethane is in the civil engineering and construction industry, accounting for 75%-80% of the total; secondly, the consumption of transportation industry accounts for about 15%. With the continuous increase of the amount of polyurethane, its limitations in the storage process are becoming increasingly apparent. Many polyurethane products have poor storage stability and are prone to mildew, which affects the quality of the prod...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/12C08G18/32
CPCC08G18/12C08G18/4812C08G18/4825C08G18/4829C08G18/6666C08G18/3874
Inventor 李逢兰胡建华刘平李艳
Owner SOUTH CHINA UNIV OF TECH
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