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A solution polymerization method for adjusting the molecular weight distribution of butyl rubber

A technology of molecular weight distribution and butyl rubber, which is applied in the field of rubber synthesis, can solve the problems of reducing the mechanical properties of the product, affecting the Mooney viscosity value, and poor stability, so as to facilitate operation and control, reduce profit loss, and improve processing. Effects of properties and physical-mechanical properties

Active Publication Date: 2018-03-09
万洲胶粘制品(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above-mentioned method of introducing additives leads to poor stability, excessive additives, increased side reactions, and chain transfer phenomenon seriously affects the Mooney viscosity value of the final product and reduces the mechanical properties of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw material refining: refining the monomer isobutylene, dehydrating the isoprene depolymerization inhibitor, and dehydrating the solvent hexane and dichloromethane.

[0025] Catalyst preparation: Aluminum trichloride is prepared into a saturated solution with hexane / dichloromethane first, and the obtained initiator is stored in a catalyst storage tank, wherein the mass concentration of aluminum trichloride is 0.1%.

[0026] Polymerization reaction: The reaction adopts solution-type kettle polymerization, and the polymerization is carried out at -80°C. The mixed solvent is dichloromethane: hexane at a ratio of 20:1 (mass ratio), and the mass concentration of isobutylene in the monomer solution is 20 %, the amount of isoprene is 0.020 of the mass of isobutylene added, the monomer solution is stored in the reaction liquid tank, and the initiator and the reaction liquid are respectively injected into the mixer at the front of the tank reactor with two metering pumps, and af...

Embodiment 2

[0029] Raw material refining: refining the monomer isobutylene, dehydrating the isoprene depolymerization inhibitor, and dehydrating the solvent hexane and dichloromethane.

[0030] Catalyst preparation: Aluminum trichloride is first prepared into a saturated solution with hexane / dichloromethane, and the obtained initiator is stored in a catalyst storage tank, wherein the mass concentration of aluminum trichloride is 0.2%.

[0031] Polymerization reaction: The reaction adopts solution-type kettle polymerization, and the polymerization is carried out at -70 ° C. The mixed solvent is dichloromethane: hexane prepared at 20:1 (mass ratio), and the mass concentration of isobutylene in the monomer solution is 25 %, the amount of isoprene is 0.030 of the mass of isobutylene added, the monomer solution is stored in the reaction liquid tank, and the initiator and the reaction liquid are respectively injected into the mixer at the front of the tank reactor with two metering pumps, and af...

Embodiment 3

[0034] Raw material refining: refining the monomer isobutylene, dehydrating the isoprene depolymerization inhibitor, and dehydrating the solvent hexane and dichloromethane.

[0035] Catalyst preparation: Aluminum trichloride is prepared into a saturated solution with hexane / dichloromethane first, and the obtained initiator is stored in a catalyst storage tank, wherein the mass concentration of aluminum trichloride is 0.15%.

[0036] Polymerization reaction: The reaction adopts solution-type kettle polymerization, and the polymerization is carried out at -90°C. The mixed solvent is dichloromethane: hexane at a ratio of 10:1 (mass ratio), and the mass concentration of isobutylene in the monomer solution is 20 %, the amount of isoprene is 0.045 of the mass of isobutylene added, the monomer solution is stored in the reaction liquid tank, and the initiator and the reaction liquid are respectively injected into the mixer at the front of the tank reactor with two metering pumps. After...

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Abstract

The invention relates to a solution polymerization method capable of regulating molecular weight distribution of butyl rubber. The method comprises the following steps: refining raw materials, wherein the mass ratio of dichloromethane to hexane in the mixed solvent is 20:1-10:1, the mass concentration of isobutylene is 20-30%, the isoprene accounts for 0.020-0.045 wt% of the isobutylene, and the mass concentration of aluminum trichloride is 0.1-0.2%; and storing an initiator solution in a storage tank, dissolving the monomers in the mixed solvent according to the concentration, mixing the two solutions, reacting in a reactor for 30-60 minutes, and carrying out after-treatment to obtain the butyl rubber, wherein the polymerization temperature is -40 to -90 DEG C. The initiator is fed periodically to regulate the number-average molecular weight, thereby controlling the molecular weight distribution. The regulation period is greater than 3 times of the retention time. The flow rate variation range of the initiator is 0.05-0.2%. Either the initiator flow rate increase range ratio or the time ratio can be changed to change the molecular weight distribution of the butyl rubber, thereby changing the processing mechanical properties of the butyl rubber.

Description

technical field [0001] The invention relates to the technical field of rubber synthesis, in particular to a solution polymerization method for adjusting the molecular weight distribution of butyl rubber. Background technique [0002] With the development of modern science and technology, polymer materials are widely used in industry, agriculture, national defense, aerospace and daily life. Polymer materials have the characteristics of high molecular weight and non-uniform molecular weight. Both molecular weight and molecular weight distribution affect the processing and mechanical properties of polymer materials. The high molecular weight part of the polymer can make it have better mechanical properties, and the low molecular weight part can make it have good processing performance. Therefore, it is of great significance to prepare polymer materials with relatively wide molecular weight distribution. The microstructure, molecular weight and distribution of polymers are the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/06C08F210/12
CPCC08F2/06C08F210/12
Inventor 周君梅
Owner 万洲胶粘制品(江苏)有限公司