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CN-122011610-A - Migration-resistant halogenated butyl rubber composition and preparation method and application thereof

CN122011610ACN 122011610 ACN122011610 ACN 122011610ACN-122011610-A

Abstract

The invention discloses an anti-migration halogenated butyl rubber composition, and a preparation method and application thereof. The migration-resistant halogenated butyl rubber composition comprises, by weight, 100 parts of main halogenated butyl rubber, 5-30 parts of liquid halogenated butyl rubber, 30-80 parts of reinforcing filler, 3-15 parts of vulcanization aid system and 1-10 parts of functional aid, wherein the weight average molecular weight of the liquid halogenated butyl rubber is 20000-30000, the halogen content is 0.5-2.5 wt%, and the molecular chain contains active halogen functional groups. According to the invention, the liquid halogenated butyl rubber (L-XIIR) with specific molecular weight range and halogen content is adopted as the reactive plasticizer, so that the reactive plasticizer and the main halogenated butyl rubber are subjected to co-vulcanization reaction in the vulcanization process, and the plasticizing chain segment is chemically fixed in a three-dimensional crosslinked network, so that the process is simple, industrial production is easy, and the problems of low-temperature flexibility improvement and migration are fundamentally solved.

Inventors

  • MA MIN
  • JIANG WEI
  • ZHOU WENXIANG
  • Qian Sicong

Assignees

  • 浙江信汇新材料股份有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The migration-resistant halogenated butyl rubber composition is characterized by comprising the following components in parts by weight: 100 parts of main body halogenated butyl rubber; 5-30 parts of liquid halogenated butyl rubber; 30-80 parts of a reinforcing filler; 3-15 parts of a vulcanization aid system; 1-10 parts of a functional auxiliary agent; wherein the weight average molecular weight of the liquid halogenated butyl rubber is 20000-30000, the halogen content is 0.5-2.5 wt%, and the molecular chain contains active halogen functional groups.
  2. 2. The migration-resistant halogenated butyl rubber composition according to claim 1, wherein, The liquid halogenated butyl rubber includes at least one of liquid brominated butyl rubber and liquid chlorinated butyl rubber.
  3. 3. The migration-resistant halogenated butyl rubber composition according to claim 1, wherein, The bulk halogenated butyl rubber includes at least one of brominated butyl rubber and chlorinated butyl rubber; The iodine value of the main body halogenated butyl rubber is in the range of 1-2.
  4. 4. The migration-resistant halogenated butyl rubber composition according to claim 1, wherein, The reinforcing filler comprises at least one of carbon black, white carbon black, calcium carbonate and clay.
  5. 5. The migration resistant halogenated butyl rubber composition according to claim 1, wherein the vulcanization aid system comprises the following components in parts by weight: 1-5 parts of zinc oxide; 1-3 parts of stearic acid; 0.5-2 parts of sulfur; 0.5-2 parts of accelerator DM.
  6. 6. The migration-resistant halogenated butyl rubber composition according to claim 1, wherein, The functional auxiliary agent comprises at least one of an anti-aging agent, a homogenizing agent, a tackifying resin and a processing auxiliary agent.
  7. 7. A process for preparing an anti-migration halogenated butyl rubber composition comprising: S100, plasticating the main body halogenated butyl rubber in an internal mixer to obtain plasticated rubber; s200, adding liquid halogenated butyl rubber into the plasticated rubber, and uniformly mixing to obtain halogenated butyl blend; S300, adding a reinforcing filler and a functional additive into the halogenated butyl blend, and uniformly mixing to obtain sulfur-free rubber compound; S400, adding a vulcanization aid system to mix when the temperature of the sulfur-free rubber compound is reduced to below 100 ℃, and discharging the sulfur-free rubber compound through a tablet press to prepare a vulcanized rubber compound; S500, carrying out mould pressing vulcanization on the vulcanized rubber material, and enabling the liquid halogenated butyl rubber and the main halogenated butyl rubber to carry out co-vulcanization reaction to obtain an anti-migration halogenated butyl rubber composition; The migration-resistant halogenated butyl rubber composition according to any one of claims 1 to 6.
  8. 8. The process for preparing a migration-resistant halogenated butyl rubber composition according to claim 7, wherein, S100, preheating the internal mixer to 70 ℃, and then adding the main body halogenated butyl rubber, wherein the plasticating time is 2 minutes; s200, after the liquid halogenated butyl rubber is added, mixing is carried out for 4 minutes at 80 ℃; In S300, the temperature of the mixing reaches 120 ℃; In S500, the vulcanized rubber is vulcanized by mold pressing at 160 ℃ and 15MPa for 20 minutes.
  9. 9. The process for preparing a migration-resistant halogenated butyl rubber composition according to claim 7, wherein, In S400, the temperature of the sulfur-free rubber compound is reduced to below 90 ℃.
  10. 10. Use of an anti-migration halogenated butyl rubber composition for the preparation of a tire innerliner, seal, protective film or shock absorbing article; The migration-resistant halogenated butyl rubber composition according to any one of claims 1 to 6.

Description

Migration-resistant halogenated butyl rubber composition and preparation method and application thereof Technical Field The invention relates to the technical field of rubber and high polymer materials, in particular to an anti-migration halogenated butyl rubber composition, and a preparation method and application thereof. Background Halogenated butyl rubber (XIIR, including brominated butyl BIIR and chlorinated butyl CIIR) has extremely low gas permeability and good weatherability due to its high backbone saturation, and is widely used for tire innerliners and various types of sealing articles. However, when used in extremely low temperature environments such as aircraft tires, cold zone vehicle tires, and the like, the low temperature brittleness temperature (Tb) of conventional solid halogenated butyl rubber is relatively high, typically from-45 ℃ to-40 ℃, and it is difficult to meet the use requirement of maintaining flexibility below-55 ℃. In order to improve the low-temperature flexibility, the prior art generally adopts a method of adding small-molecule plasticizers such as naphthenic oil, paraffin oil and the like. However, these conventional plasticizers have the obvious disadvantages of (1) strong mobility, easy exudation of small molecular plasticizers from rubber matrix during vulcanization and long-term use, gradual deterioration of low-temperature performance, (2) damage of air tightness, micropores left after the migration of plasticizers, damage of compact structure of materials, reduction of gas barrier performance, (3) pollution of adjacent layers, possibility of pollution of adjacent adhesive layers or fabrics by exudates, reduction of interlayer adhesion reliability, (4) mechanical property attenuation, no chemical bonding of plasticizers and rubber networks, easy reduction of mechanical indexes such as tensile strength, tearing strength and the like after long-term use, and (5) poor durability, and failure to keep stable performance under severe conditions such as temperature circulation, dynamic stress and the like. Some of the literature suggests the use of liquid rubber as plasticizing component, but its molecular weight is generally too low (< 10000) or lacks sufficient active halogen sites to participate in the vulcanization reaction, and there is still a significant tendency to migrate, failing to fundamentally solve the above problems. In addition, there are studies on attempts to use liquid rubber with high molecular weight, but it is difficult to uniformly disperse the liquid rubber in the mixing process due to the excessively high viscosity, and the consistency of the properties of the final product is affected. Therefore, there is an urgent need in the art for a rubber composition that can significantly reduce the brittleness temperature of halogenated butyl rubber, ensure long-term stability of low temperature properties, have no migration, and maintain excellent air tightness and mechanical properties, while requiring good processability and process suitability. Disclosure of Invention The invention aims to provide an anti-migration halogenated butyl rubber composition, a preparation method and application thereof, which are used for solving at least one technical problem, and the anti-migration halogenated butyl rubber composition is characterized in that liquid halogenated butyl rubber (L-XIIR) with specific molecular weight range and halogen content is adopted as a reactive plasticizer, so that the liquid halogenated butyl rubber (L-XIIR) and main halogenated butyl rubber undergo co-vulcanization reaction in the vulcanization process, a plasticizing chain segment is chemically fixed in a three-dimensional crosslinked network, the process is simple, industrial production is easy, and the improvement of low-temperature flexibility and the solution of migration problem are fundamentally realized. Embodiments of the present invention are implemented as follows: An anti-migration halogenated butyl rubber composition comprises the following components in parts by weight: 100 parts of main body halogenated butyl rubber. 5-30 Parts of liquid halogenated butyl rubber. 30-80 Parts of reinforcing filler. 3-15 Parts of a vulcanization aid system. 1-10 Parts of functional auxiliary agent. Wherein the weight average molecular weight of the liquid halogenated butyl rubber is 20000-30000, the halogen content is 0.5-2.5 wt%, the molecular chain contains active halogen functional group, and the liquid halogenated butyl rubber can be co-vulcanized with the main body halogenated butyl rubber under the vulcanization condition. The preparation method has the technical effects that the liquid halogenated butyl rubber with a specific molecular weight range is selected as the reactive plasticizer, and the molecular weight range has good flow dispersibility and enough active halogen content. The proportion of each component is optimized, and excellent air tightness and mechanical property are ma