Preparation method for improving polymerization temperature of polyisomonoolefin-based elastomer or molecular weight of elastomer

A polymerization temperature and high molecular weight technology, applied in the field of polymer compound preparation, can solve the problems of butyl rubber molecular chain branching and poor product performance, so as to increase the polymerization reaction temperature, slow down the polymerization rate, and reduce the consumption of volatilization Effect

Pending Publication Date: 2022-04-26
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the butyl rubber molecular chain prepared by the above solution method has branching phenomenon, and the product performance is not as good as that of the slurry method product.

Method used

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  • Preparation method for improving polymerization temperature of polyisomonoolefin-based elastomer or molecular weight of elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A 4-liter low-temperature polymerization kettle was used, which was baked, vacuumed, and nitrogen-filled, then cooled to -90°C, and 1300 g of dichloromethane, 540 g of isobutylene, and 16 g of isoprene were added. Add 0.01M aqueous solution as the main initiator, 0.1M trichlorotriethyl dialuminum as the co-initiator, mix and configure the initiation system, and then press nitrogen into the reactor to initiate polymerization, and finally add a small amount of methanol to terminate the reaction, and then the product The solvent was removed and dried to constant weight.

Embodiment 2

[0060] A 4-liter low-temperature polymerization kettle was used, which was baked, vacuumed, and nitrogen-filled, then cooled to -90°C, and 1300 g of dichloromethane, 540 g of isobutylene, 16 g of isoprene, and 5 g of the third component, methyl benzoate, were added. Add 0.01M aqueous solution as the main initiator, 0.1M trichlorotriethyl dialuminum as the co-initiator, mix and configure the initiation system, and then press nitrogen into the reactor to initiate polymerization, and finally add a small amount of methanol to terminate the reaction, and then the product The solvent was removed and dried to constant weight.

Embodiment 3

[0062] A 4-liter low-temperature polymerization kettle was used, and after baking, vacuuming, and filling with nitrogen, it was cooled to -80°C, and 1300 g of methylene chloride, 540 g of isobutylene, and 16 g of p-methylstyrene were added. Add 0.01M aqueous solution as the main initiator, 0.15M aluminum chloride as the co-initiator, mix and configure the initiation system, then press nitrogen into the reactor to initiate polymerization, and finally add a small amount of methanol to terminate the reaction, and then remove the solvent from the product , dried to constant weight.

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Abstract

The invention discloses a series of synthesis methods for increasing the polymerization reaction temperature or molecular weight of a polyisobutylene-based elastomer by adding a third component in a cationic polymerization process. In the traditional production process technology for synthesizing the polyisobutylene-based elastomer, in order to reduce many uncontrollable factors brought to polymerization reaction due to the fact that reaction heat is not discharged in time, extremely low reaction temperature is usually needed. Aromatic ketone, aromatic ether or aromatic ester or a mixture of the aromatic ketone, the aromatic ether or the aromatic ester is added as a third component, so that the active center of carbon cations is stabilized, and the polymerization rate is slowed down. Through exploration, when products with the same molecular weight are prepared, the polymerization temperature can be increased by 5-40 DEG C, the volatilization consumption of a coolant is reduced, the energy consumption is reduced, and the continuous operation period of the polymerization kettle is prolonged. And under the conditions of the same heat transfer area and reaction temperature, the prepared product can obtain higher molecular weight.

Description

technical field [0001] The invention belongs to the field of polymer compound preparation, and more specifically relates to a preparation method for increasing the polymerization temperature of polyisobutylene-based elastomer or the molecular weight of the elastomer in the cationic polymerization system in the field of synthetic rubber. Background technique [0002] Polyisobutylene is a product obtained by cationic polymerization of monomer isobutylene. It is a saturated polymer, so it is resistant to aging, ozone, and corrosion from various inorganic acids, alkalis, salts and polar media. Also, polyisobutylene has excellent insulation and excellent airtightness. As an important strategic material, butyl rubber synthesized from isobutylene and a small amount of isoprene plays an important role in the fields of national defense, aerospace, medical equipment, etc., especially in the fields of gas sealing, damping and vibration reduction. The advantages of substitution, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/12C08F236/08C08F212/14C08F212/12C08F110/10C08F2/38
CPCC08F210/12C08F110/10C08F236/08C08F212/12C08F212/18C08F2/38
Inventor 伍一波赵朕于兆鹏刘若凡金玉顺
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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