Optimized production process of terminal hydroxy liquid polybutadiene

A technology of liquid polybutadiene and production process, which is applied in the field of optimized production process of hydroxyl-terminated liquid polybutadiene, can solve the problems of unsmooth production process, unstable control of process parameters, unstable product quality, etc. Achieve the effect of reducing mechanical separation, solving emulsification phenomenon, and pure color

Inactive Publication Date: 2003-09-17
SHANDONG QILU ETHYLENE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The product quality is unstable and fluctuates greatly;
[0006] 2. The production yield of the product is low and the production cost is high;
[0007] 3. There is emulsification phenomenon in the production process, and all links of the production process are not smooth;
[0008] 4. The formula is unreasonable, the control of process parameters is unstable, and there is no guarantee of safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use a pump to feed butadiene into a 10% sodium hydroxide alkali washing tank, remove the polymerization inhibitor in the butadiene to below 30ppm, and then pass it into the water washing tank to remove the trace amount of alkali remaining in the butadiene, Then put it in the butadiene metering tank for later use.

[0024] The concentration of butadiene through the above-mentioned treatment is 99.5%, wherein the alkyne content is less than 50ppm, and 27.5% hydrogen peroxide and 95% ethanol are added to 1000 liters of mechanical seal according to the weight ratio of 1: 0.047: 0.8 (recommended pure amount) to react In the kettle, the temperature was raised rapidly to 117° C. within half an hour and reacted for 2.5 hours. After the polymerization reaction, the temperature of the product is lowered to 75°C. After degassing, the material is filtered from the kettle to the settling tank for sedimentation and stratification. The oil phase (glue) is moved to the water washing ta...

Embodiment 2

[0027] According to the technique of Example 1, butadiene was reacted with 27.5% hydrogen peroxide and 95% ethanol in a weight ratio of 1:0.030:0.65 (equivalent to pure amount). The reaction temperature was 119°C, and the reaction time was 2 hours.

[0028] The hydroxyl value of the product terminal hydroxyl liquid polybutadiene is 0.60mmol / g, the number average molecular weight is 3800Mn, the viscosity is 8.4(Pa.S, 40°C), the moisture is 0.05(m / m), and the peroxide<0.05%( m / m).

Embodiment 3

[0030] According to the technique of Example 1, butadiene was reacted with 27.5% hydrogen peroxide and 95% ethanol in a weight ratio of 1:0.041:0.95 (equivalent to pure amount). The reaction temperature was 115°C, and the reaction time was 3 hours.

[0031] The hydroxyl value of the product terminal hydroxyl liquid polybutadiene is 0.76mmol / g, the number average molecular weight is 3000Mn, the viscosity is 3.1 (Pa.S, 40°C), the moisture content is 0.05 (m / m), and the peroxide is less than 0.05% ( m / m).

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Abstract

An optimized process for preparing liquid-phase hydroxy-terminated polybutadiene from butadiene includes such steps as washing the butadiene with alkali solution and then water, adding the butadiene and H2O2 as trigger to organic solvent, polymerizing reaction, cooling to 60-85 deg.C, degassing, filtering, deposition for layering, washing oil phase with hot water, dewatering and filter. Its advantages are short process, high output rate and high quality of product.

Description

technical field [0001] The invention relates to a production process of hydroxyl-terminated liquid polybutadiene. Background technique [0002] Hydroxyl-terminated liquid polybutadiene, also known as polybutadiene diol, referred to as HTPB, is a liquid polymer developed in the 1960s. It can be made into a three-dimensional network structure through chain extension and cross-linking. Elastomer, because it has the same properties as solid rubber, is also called liquid rubber. In 1971, ARCO in the United States built an industrialized production device, and then the former Soviet Union, France, and Japan also had corresponding industrialized devices put into production. It was first used as a solid rocket propellant and a rocket engine lining. In addition to military use, it also has many uses in civilian use: (1) Modifier of rubber and plastic; (2) Electrical potting material; (3) Sealing material; (4) Adhesive; (5) Casting tires and repairing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F136/06
Inventor 常传新刘洪华于志清杨洪胜崔文军周文凭张传芬
Owner SHANDONG QILU ETHYLENE CHEM
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