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Low-halogen-salt-content halogenated butyl rubber and preparation method thereof

A technology of halogenated butyl rubber and content, applied in the field of halogenated butyl rubber, can solve the problems of high requirements for centrifuges, high price, large volume of centrifuges, etc., and achieves the effect of better separation effect, less equipment investment and good separation effect.

Active Publication Date: 2016-12-07
山东京博中聚新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second process can remove more halogen salts than the first process, but due to the emulsification effect of the mixed material after neutralization, the static separation effect is very low; the third process has the highest removal efficiency, but due to the mixed The viscosity of the light component (halogenated butyl rubber glue) in the system is very high. In order to improve the centrifugal separation effect, the requirements for the centrifuge are very high.
Such centrifuges are usually bulky and expensive, limiting their applications

Method used

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  • Low-halogen-salt-content halogenated butyl rubber and preparation method thereof
  • Low-halogen-salt-content halogenated butyl rubber and preparation method thereof
  • Low-halogen-salt-content halogenated butyl rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of halogenated butyl rubber with low halogen salt content and preparation method thereof

[0046] The unsaturation is that the isobutylene-isoprene copolymer (Yanshan Petrochemical, IIR1751) of 1.7mol% is dissolved in hexane (Jingbo Petrochemical, the purity of n-hexane is 85wt%) to obtain a glue solution with a concentration of 10wt%, and the temperature is raised to After 40°C, add bromine (Albemarle) into the reactor at a flow rate of 17.3g / h at a flow rate of 4kg / h;

[0047] After the bromination reaction is completed, the glue enters the neutralization reactor. The flow rate of the aqueous sodium hydroxide solution with a concentration of 0.17wt% is 2.7kg / h. When neutralizing, the water phase content is 40.3wt% of the glue. The value is 7.75;

[0048] The oil-water mixture then enters the oil-water static separation tank, and after the oil-water is initially separated, the bromine-containing salt wastewater is discharged;

[0049] The oil phase with a wate...

Embodiment 2～7

[0057] The details of the specific operations in Examples 2-7 are the same as those in Example 1, except that the concentration of the IIR glue is changed. In addition, in order to adjust the pH value of the water phase after neutralization, the concentration and flow rate of the lye used for neutralization are adjusted. In order to compare the effects of different washing fresh water dosages, the fresh water dosages for glue washing after neutralization, the fresh water dosages for washing colloidal particles, and the NaBr content in the final product are shown in Table 1.

[0058] Table 1 Analysis data of each point

[0059]

[0060] *The content of sodium bromide in the product is converted from the sodium content obtained by plasma emission spectrometry. 1 mol of sodium corresponds to 1 mol of sodium bromide. The sodium in the product mainly exists in the form of sodium bromide. For the convenience of calculation, it is assumed that all the sodium exists in the produc...

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Abstract

The invention relates to the field of butyl rubber, and provides a low-halogen-salt-content halogenated butyl rubber and a preparation method thereof. The method comprises the following steps: carrying out preliminary standing for oil-water separation on a neutralized halogenated butyl rubber liquid / water mixed system, washing the separated rubber liquid by using fresh water, and carrying out standing for oil-water separation on the washed halogenated butyl rubber liquid / water mixed system, sending the separated halogenated butyl rubber liquid into a condensation system to recover the solvent, screening to obtain halogenated butyl rubber particles with appropriate particle size, washing the halogenated butyl rubber particles by using fresh water, and sending into an after-treatment drying system, thereby obtaining the final finished product. The halogenated butyl rubber obtained by the technique has very low halogen salt content; and the technique has the advantages of simple process and low investment.

Description

technical field [0001] The invention relates to the field of halogenated butyl rubber, in particular to a halogenated butyl rubber with low halogen salt content and a preparation method thereof. Background technique [0002] Butyl rubber is a copolymer of isobutylene and a small amount of diene such as isoprene. Butyl rubber has excellent air tightness and heat and oxygen aging resistance, and is widely used in inner tubes, vulcanizing bladders, airtight sealing materials, anti-corrosion and waterproof materials, and medical materials. However, due to the low unsaturation of butyl rubber, slow vulcanization speed and poor compatibility with other high unsaturation rubbers, the processing and application of butyl rubber is limited. After butyl rubber is halogenated, the vulcanization reactivity increases significantly, and it can be co-vulcanized with other high-unsaturated rubbers, and the bonding performance with metals is significantly improved. Thus, halogenated butyl r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C2/02
CPCC08C2/02
Inventor 马韵升栾波任学斌崔红梅李玉超徐宏德
Owner 山东京博中聚新材料有限公司