Micro-crosslinking self-repairing sealant as well as preparation method and application thereof

A sealant and self-repairing technology, applied in adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve problems affecting product performance, long processing time, high processing temperature, etc., to achieve strong viscosity and not easy to move out , the effect of low processing temperature

Active Publication Date: 2022-05-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing self-healing sealant processing methods usually use thermoplastic polymers as matrix materials (IIR, SIS, POE), medium and low molecular weight resins as tackifiers and viscosity regulators, and a small amount of fillers and antioxidants. , add in the kneader one time in order, heat and stir to obtain samples (such as Chinese patent CN106080051A, main material 12%~18%, tackifying resin 20~30%, softening agent 40%~50%, anti-aging antioxidant 1%~ 2%, filler 9% to 12%), but this processing method takes a long time to process, the processing temperature is high, and the heating time is too long, causing serious aging of the material and affecting product performance

Method used

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  • Micro-crosslinking self-repairing sealant as well as preparation method and application thereof
  • Micro-crosslinking self-repairing sealant as well as preparation method and application thereof
  • Micro-crosslinking self-repairing sealant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0054] 112 parts of butyl rubber 1953 (2.5% unsaturation), 48 parts of medium molecular weight polyisobutylene PIB8950 (0.06% unsaturation), 50 parts of low molecular weight polyisobutylene (PIB2300), 3.2 parts of antioxidants 1010, 24 Parts of calcium carbonate, 24 parts of carbon black N220, 5 parts of tackifying resin, 5 parts of homogenizer HA40, 2 parts of sulfur, 2 parts of accelerator TMTD, 7.2 parts of n-dodecane mercaptan were blended at 40°C with an internal mixer, and used for later use. . Afterwards, the product was blended with another part of low molecular weight polyisobutylene PIB2300 through an extruder (the addition amounts of Examples 1 to 3 were 142 parts, 110 parts, and 78 parts, respectively) at 120° C. to form a strong viscous viscous kneading. glue. In Examples 1-3, the ratios of 1:1.2, 1:1, and 1:0.8 were used as the variables respectively according to the low molecular weight and high activity polyisobutylene PIB2300 and the matrix material, and the ...

Embodiment 4～6

[0065]A total of 160 parts of butyl rubber and medium molecular weight polyisobutylene, 50 parts of low molecular weight polyisobutylene (PIB2300), 3.2 parts of antioxidant 1010, 24 parts of calcium carbonate, 24 parts of carbon black N220, 5 parts of tackifier resin, 5 parts of uniform Agent HA40, 2 parts of sulfur, 2 parts of accelerator TMTD, and 7.2 parts of n-dodecanethiol were blended at 40°C with an internal mixer and used for later use. Afterwards, the product was blended with 142 parts of low-molecular-weight high-activity polyisobutylene at 120° C. in an extruder to form a highly viscous viscous compounded rubber. Examples 4 to 6 were prepared according to the ratio of the base material butyl rubber to the medium molecular weight polyisobutylene at the feeding ratios of 1:1, 7:3, and 9:1. After extrusion coating on the rubber side, the samples were obtained by baking and vulcanizing at 170 °C for the positive vulcanization time. The test results of the vulcanization ...

Embodiment 7～10

[0077] Mix 112 parts of butyl rubber with 48 parts of medium molecular weight polyisobutylene, 50 parts of low molecular weight polyisobutylene (PIB2300), 3.2 parts of antioxidant 1010, 24 parts of calcium carbonate, 24 parts of carbon black N220, 5 parts of tackifier resin (please add The amount of tackifier), 5 parts of homogenizer HA40, 2 parts of sulfur, 2 parts of accelerator TMTD, and n-dodecane mercaptan of different additions were mixed with an internal mixer at 40°C for use, and then the product was put in an extruder. Blended with 142 parts of low molecular weight high activity polyisobutylene at 120°C to form a viscous rubber compound with strong viscosity. In Examples 7-10, the variables were set according to the mass ratio of mercapto compound to butyl rubber of 0:1, 0.032:1, 0.064:1, and 0.093:1, and the samples were obtained after vulcanization at 170°C according to the positive vulcanization time. The test results of the vulcanization performance of the samples ...

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Abstract

According to the micro-crosslinking tire self-repairing sealant and the preparation method thereof, the sealant has extremely low modulus and extremely high self-adhesion and has certain elasticity, and when a tire is punctured by foreign matter, the sealant can immerse into gaps under the action of tire pressure to bond cracks, so that the tire pressure is guaranteed. The sealant main body is preferably selected from butyl rubber, brominated butyl rubber and medium-molecular-weight polyisobutene, the softening agent is preferably selected from low-molecular-weight polyisobutene, the low-molecular-weight polyisobutene has excellent compatibility with the medium-molecular-weight polyisobutene and the butyl rubber and is not easy to migrate out, and the sealant is endowed with extremely strong viscosity while the modulus of the sealant is reduced.

Description

technical field [0001] The invention belongs to the technical field of tires, and in particular relates to a micro-crosslinked self-healing sealant and a preparation method and application thereof. Background technique [0002] Tire puncture is one of the frequent accidents in automobiles, and puncture is usually caused by tire trauma. It is understood that the crown of automobile tires is often punctured by nails or other sharp objects, resulting in vehicle driving accidents. In order to reduce the risk of puncture, people first developed structurally reinforced runflat tires, which prevented the tire from puncturing by strengthening the sidewall or adding a support structure inside the tire. [0003] The existing self-healing sealant processing methods usually use thermoplastic polymers as matrix materials (IIR, SIS, POE), medium and low molecular weight resins as tackifiers and viscosity modifiers, with a small amount of fillers and antioxidants. , add it to the kneader...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J123/22C09J123/20C09J11/04C09J11/06C09J11/08
CPCC09J123/22C09J11/04C09J11/06C09J11/08C08L2205/025C08L2205/035C08K2003/265C08L23/22C08L45/00C08L57/02C08L93/04C08K13/02C08K5/1345C08K3/26C08K3/04C08K3/06C08K5/40Y02E10/50
Inventor 吴卫东杨昕桥王佳成刘辉
Owner BEIJING UNIV OF CHEM TECH
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