Coupling agent-modified calcium carbonate filled polypropylene plastic

Abstract

The invention discloses a coupling agent modified calcium carbonate filled polypropylene plastic, which consists of the following components: 100 kg of polypropylene, 15 kg of calcium carbonate, 0.04 kg of γ-chloropropyltriethoxysilane, isopropyl Base tri(dioctyl phosphate acyloxy) titanate 0.12 kilogram and polyethylene glycol trimethoxysilyl propyl ether 0.04 kilogram; Coupling agent is diluted with the solvent xylene of 5 times weight of coupling agent, is dispersed in In the calcium carbonate, the xylene is completely volatilized, and the pulverizer is crushed into fine powder to obtain a modified calcium carbonate; the polypropylene and the modified calcium carbonate are added to the mixer and stirred, and the control speed is 00-400r / min, and the stirring temperature is 70 ‑80°C, stirring time 2‑4 minutes, extrusion granulation, extrusion temperature 180‑200°C, cooling in cold water 10‑40°C for molding. The invention has better various mechanical properties, and has better tensile strength, elongation at break, notched impact strength, thermal deformation temperature and Rockwell hardness.

Description

technical field [0001] The invention relates to a plastic material, in particular to a coupling agent modified calcium carbonate filled polypropylene plastic. Background technique [0002] Polypropylene, abbreviated as PP, CAS number: 9003-07-0. It is a thermoplastic resin obtained by polymerizing propylene. It was first put into industrial production in Italy in 1957, and it is another important plastic variety after polyethylene (PE). It has good heat resistance, and it will not be destroyed when it is cooked at 135°C for 1000 hours. The specific heat capacity and thermal conductivity of PP are smaller than that of PE, but its thermal insulation is better than that of PE. PP is a non-polar polymer with excellent dielectric and electrical insulation properties. The electrical properties are basically not affected by ambient humidity and electric field frequency. Within the allowable operating range, the increase in temperature will reduce the electrical properties. Its H...

AI Technical Summary

Problems solved by technology

Adding inorganic fillers such as calcium carbonate to plastics can improve the heat resistance, wear resistance, dimensional stability and rigidity of the product, and reduce the cost of the product, but the powder is added to the polymer material without treatment, and the filler and There is an obvious interface between the polymers, just like there are many cavities in the matrix resin, the effective cross-sectional area that can withstand the external force is reduced under the action of external force, and the mechanical properties of the filling material are deteriorated

[0004] In addition, polymer particles are usually used in the production process, which are mixed with inorganic powder and then formed, which can easily cause uneven mixing of materials and affect the performance of the product.