Method for preparing reactive nano calcium carbonate-native rubber composite material

Abstract

The invention provides a preparation method for a reactive nanometer calcium carbonate-natural rubber composite material, which is characterized in that, the nanometer calcium carbonate or proper amount of coupler or anionic surfactant is added to deionized water to be stirred and ultrasonically dispersed, and then proper amount of emulsion epoxidized natural rubber is added to be continuously stirred and ultrasonically dispersed to prepare nanometer calcium carbonate aqueous dispersion; meanwhile, proper amount of non-ionic surfactant is used for stabilizing the proper amount of emulsion natural rubber; the nanometer calcium carbonate aqueous dispersion is uniformly mixed to the emulsion natural rubber under the condition of continuous stirring; the unsaturated carboxylic acid neutralizing solution with the pH value adjusted by potassium hydroxide and a triggered cross linker are dropped into the mixture under 60 DEG C of water bath condition to obtain the latex-stated nanometer calcium carbonate-natural rubber composite material. The vulcanizing film of the composite material can reach 25-30MPa of tensile strength, 800-950 percent of maximum elongation and 3.5-6.0MPa of 300 percent stretching stress.

Description

1. Technical field [0001] The invention relates to a preparation method of a natural rubber composite material, in particular to a preparation method of a reactive nanometer calcium carbonate-natural rubber composite material. 2. Background technology [0002] During the processing of natural rubber, a certain amount of filler compounding agent must be added, the purpose of which is: 1) to meet the requirements of rubber product processing technology; 2) to reinforce rubber and improve the mechanical properties of rubber products; 3) to reduce production cost. At present, the fillers widely used in the rubber industry mainly include carbon black, silica, fiber, clay, calcium carbonate, etc. Among them, carbon black, white carbon black, fiber and other fillers have different degrees of reinforcing effect on rubber, but the price is relatively high and it is easy to generate heat. Inorganic fillers such as pottery clay and calcium carbonate have low prices and are not easy t...

AI Technical Summary

Problems solved by technology

However, the nano-CaCO prepared by the above method 3 / NR composite tensile strength only fluctuates in the range of 20-25Mpa

One is that nano-CaCO 3 The primary particles are too fine, it is extremely difficult to mix and disperse directly with rubber machinery, and the rubber material is seriously stuck to the roller, which reduces the quality of the mixed rubber and reduces its reinforcing effect

The second is nano-CaCO 3 May not be well dispersed in rubber or nano CaCO 3 In the rubber matrix, the lack of sufficient cross-linking with the rubber molecular chain only plays a semi-reinforcing role, resulting in the formation of nano-CaCO 3 The reinforcing effect on natural rubber is still not obvious enough