High-toughness tire mold casting gypsum powder and preparation process thereof

Abstract

The invention relates to high-toughness tire mold casting gypsum powder and a preparation process thereof. The high-toughness tire mold casting gypsum powder is prepared from the following raw materials in parts by weight: 100 parts of alpha-gypsum powder, 15-30 parts of polyolefin elastomer, 10-20 parts of ethylene-vinyl acetate copolymer, 15-30 parts of quartz powder and 0.05-0.1 part of peach gum. The invention further relates to the preparation process of the high-toughness tire mold casting gypsum powder. The high-toughness tire mold casting gypsum powder disclosed by the invention has not only longer effective stirring time and flow time but also appropriate initial setting time and final setting time, and a casting gypsum mold prepared by the high-toughness tire mold casting gypsum powder is greatly improved in the aspects of strength and toughness, can completely meet the current requirements of various technical parameters of tire enterprises in China on tire casting molds and has the advantages of wide range of application and long service life; and the preparation process is simple, easy to operate and beneficial to industrial production.

Description

technical field [0001] The invention relates to a tire mold casting gypsum powder and a preparation process thereof, in particular to a high-toughness tire mold casting gypsum powder and a preparation process thereof. Background technique [0002] At present, most tire casting gypsum mold manufacturers directly use high-strength gypsum (α-gypsum) powder as raw material when making tire casting gypsum molds, and mix it with water at a mass ratio of 1:0.5-0.55 for mold making. The obtained gypsum slurry has a high degree of thinness and consistency, and its effective stirring time is only 3 minutes, the flow time is 3-5 minutes, the initial setting time is 9 minutes, and the final setting time is 30 minutes. In addition, the mold made by using the above-mentioned α-gypsum powder has a large expansion coefficient of about 0.5; a low dry flexural strength of about 7MPa; and a low dry compressive strength of about 22MPa. Because the initial setting time of raw materials is too s...

AI Technical Summary

Problems solved by technology

In addition, the mold made by using the above-mentioned α-gypsum powder has a large expansion coefficient, about 0.5; the dry flexural strength is low, about 7MPa; the dry compressive strength is also low, about 22MPa

Because the initial setting time of raw materials is too short, the effective mixing time and flow time are also short, which not only causes certain limitations to the operation, but also is not conducive to the trimming of the mold made, especially due to insufficient strength and toughness. adverse effect on the service life of