High-strength tire mould casting gypsum powder and preparation process thereof

Abstract

The invention relates to high-strength tire mould casting gypsum powder and a preparation process thereof. The gypsum powder is prepared from, by weight, 100 parts of alpha-gypsum powder, 15-30 parts of glass fibers, 0.3-0.5 part of sulfonated melamino-formaldehyde resin and 0.05-0.1 part of peach gum. The high-strength tire mould casting gypsum powder is not only long in effective stirring time and flowing time but also proper in initial setting time and final setting time, and tire moulds prepared by the gypsum powder are high in strength, capable of completely meeting requirements of current domestic tire enterprises on various technical parameters of the tire casting moulds, wide in application range and long in service life. The preparation process of the high-strength tire mould casting gypsum powder 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-strength 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 sh...

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, which greatly reduces the mold quality. service life