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A kind of nano silicon dioxide with surface grafted polyisoprene, preparation method and application thereof

A technology of nano-silica and polyisoprene, which is applied in the field of rubber and plastic fillers, can solve problems such as difficult large-scale preparations, and achieve the effects of simple preparation methods, shortened vulcanization time, and improved elongation strength

Active Publication Date: 2019-08-13
安徽凯得兴汽车零部件科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These spherical fillers can more or less improve the performance of a single polymer when used, but it is difficult to prepare in large quantities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation method of the nano silicon dioxide of surface grafting polyisoprene, comprises the following steps:

[0033] 1) First mix 15g of nano-silica and 100mL of dichloromethane, then add 3.64g of 2-(dodecyltrithiocarbonate)-2-methylpropionic acid, 1.91g of 1-(3-dichloromethane) Methylaminopropyl)-3-ethylcarbodiimide hydrochloride and 0.122g of 4-dimethylaminopyridine, mix well, ultrasonically disperse at 25°C for 10min, end the ultrasound, react at 25°C for 40h, after the reaction Wash three to five times with a large amount of dichloromethane, then wash three times with a large amount of methanol until the unreacted RAFT reagent is cleaned up, and then dry in a vacuum oven at 50°C for 24 hours to obtain isoprene monomer Nano silica with RAFT polymerization.

[0034] 2) Put 12g of the product prepared in step 1) into a high-pressure reactor, add 20g of 1,4-dioxane and sonicate for 15 minutes, then add 10.400g of isoprene monomer and 0.164g of di-tert-per...

Embodiment 2

[0036] A kind of nano silicon dioxide grafted with polyisoprene on the surface is used for filling thermoplastic elastomer materials. Specifically:

[0037] After the SBS was masticated at 100°C on a type open mill, the above-prepared polyisoprene nano-silica was added, and after mixing evenly, it was pressed into tablets on a type flat vulcanizer at 160°C. Tensile tests were performed on 5 splines per group. The tensile strength of pure SBS is 22.75MPa, and the 300% modulus stress is 3.548MPa; the tensile strength of SBS containing 10% polyisoprene nano-silica is 30.04MPa, and the 300% modulus stress is 7.201MPa.

Embodiment 3

[0039] A kind of nano silicon dioxide grafted with polyisoprene on the surface is used for filling of rubber materials. Specifically:

[0040] Mix the natural rubber raw rubber on the open mill, plasticize the rolls, add polyisoprene nano-silica and mix evenly, then add the accelerator DM and sulfur, and vulcanize the samples with a flat vulcanizer at 150°C, 5 for each group The splines were subjected to tensile testing. The tensile strength of natural rubber containing 10% polyisoprene nano-silica is 0.86MPa, and the 300% modulus stress is 0.439MPa; the tensile strength is 2.47MPa, and the 300% modulus stress is 1.193MPa.

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Abstract

The invention provides a nano silicon dioxide with grafting of polyisoprene on the surface, a preparation method and an application thereof. The preparation method comprises the steps of dispersing the nano silicon dioxide in a solvent, then adding an RAFT (Reversible Addition Fragmentation chain Transfer) reagent with carboxyl groups, a dewatering agent and a catalyst for reaction to obtain nano silicon dioxide capable of initiating RAFT polymerization of isoprene monomers; then mixing with the isoprene monomers for reaction to obtain the nano silicon dioxide with grafting of the polyisoprene on the surface. The nano silicon dioxide particles can improve the blending effect of different rubbers or the rubbers and plastic molecules in a more-effective manner by utilizing the compatibility of the grafted polyisoprene and a base material so as to provide a better basis for exerting the synergistic property of different components in a more-effective manner.

Description

technical field [0001] The invention belongs to the field of rubber and plastic fillers, and in particular relates to a nano silicon dioxide surface-grafted with polyisoprene, a preparation method and an application thereof. This type of nano-silica particles grafted with polyisoprene on the surface utilizes the compatibility of grafted polyisoprene and matrix materials to more effectively improve the blending effect of filled rubber or plastics, for a more effective play The synergistic performance of different components provides a better basis. Background technique [0002] Recently, organic / inorganic nanohybrid composites have brought special changes in the physical and chemical properties of materials due to the dispersion of their phases in the nanoscale range. This material generally has excellent mechanical properties, thermal stability, special surface properties, etc., and has attracted increasing attention. Various nanoparticles are mainly used as fillers to fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F236/08C08L53/02C08L51/10C08L7/00
CPCC08F292/00C08L7/00C08L53/02C08F236/08C08L51/10
Inventor 相益信沈显荣林英高建纲
Owner 安徽凯得兴汽车零部件科技有限公司
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