Preparation method of nano calcium carbonate suspension used for natural rubber latex reinforcement

Abstract

A preparation method of nano calcium carbonate suspension used for natural rubber latex reinforcement comprises the following steps: mixing pure concentration of organic alcohol and silane coupling agent, and fully and uniformly stirring to prepare a complexing agent, the weight ratio of the organic alcohol and silane coupling agent being 1 : 0.8-1.4; weighing 100 parts by weight of surface-modified nano calcium carbonate by stearic acid to slowly mix with 45 to 60 parts by weight of the complexing agent to prepare a mixed liquid; sealing the mixed liquid in a container, allowing the container to stand at room temperature, so that the complexing agent is slowly penetrated into the surface of the nano calcium carbonate until a layer of water film is observed to appear on the surface of the nano calcium carbonate, then adding 800 to 950 parts of water, and uniformly stirring to prepare the nano calcium carbonate suspension used for natural rubber latex reinforcement. The method uses relatively little amount of the complexing agent, and can ensure a uniform contact of the complexing agent with the stearic acid on the surface of the modified nano calcium carbonate particles.

Description

technical field [0001] The invention relates to a preparation method of nanometer calcium carbonate suspension used for natural rubber latex reinforcement. technical background [0002] Natural rubber latex has the characteristics of high viscosity and poor fluidity. In order to ensure the uniformity of the added solid material in the natural rubber latex, the solid material is usually prepared into a certain concentration of solution or suspension; when preparing the suspension, the suspension must also be Appropriate fluidity, and then add the suspension to the natural rubber latex being stirred, this method is called liquid-liquid method. [0003] Nano-calcium carbonate materials have a large specific surface area and are easy to coagulate, and the surface of nano-calcium carbonate particles is hydrophilic and oleophobic, and the direct binding force with rubber and other polymer interfaces is weak, so manufacturers generally use stearic acid to modify the surface of nano...

AI Technical Summary

Problems solved by technology

[0005] However, due to the small size of the nanomaterial particles, the modified nano-calcium carbonate particles treated with stearic acid are extruded and bonded into small groups, and the surface of the modified nano-calcium carbonate has strong hydrophobicity; if the compounding agent is diluted with water to a certain concentration Then add modified nano-calcium carbonate particles to stir, or directly add modified nano-calcium carbonate particles to the compound agent diluted with water to a certain concentration and then stir. The above method will make the water molecules in the compound agent with a certain concentration wrapped into small The modified nano-calcium carbonate in the form of agglomerates prevents the compounding agent from evenly contacting the stearic acid on the surface of the modified nano-calcium carbonate particles, and the reinforcing effect of the nano-calcium carbonate particles cannot be fully displayed, which affects nano-calcium carbonate / natural rubber latex products performance