High-fluidity tire forming gypsum powder and preparation process thereof

Abstract

A high-fluidity tire forming gypsum powder and a preparation process thereof are provided. The gypsum powder is composed of the following raw materials in parts by weight: 100 parts of alpha-gypsum powder, 15-25 parts of white silicate cement, 0.5-1.5 parts of sulfonated melamine formaldehyde resin, 1-3 parts of peach gum, and 5-15 parts of magnesium sulfate. The invention further provides a preparation process of the high-fluidity tire forming gypsum powder. The high-fluidity tire forming gypsum powder of the invention not only has long effective stirring time and flowing time but also has proper initial coagulation time and final coagulation time; the tire forming gypsum die prepared by the invention is featured with high intensity, wide application range and long service life; and the preparation process is simple and easy in operation. In this way, the high-fluidity tire forming gypsum powder of the invention is beneficial to industrial production.

Description

Technical field [0001] The invention relates to a high-fluidity tire 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 the raw material when making tire casting gypsum molds. The mass ratio is 1:0.5~0.55 mixed with water for mold production. The obtained gypsum slurry has a relatively high degree of thinness, and its effective mixing time is only 3 minutes, the flow time is 3 to 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 α-gypsum powder has a large expansion coefficient of about 0.5; the dry flexural strength is low, about 7MPa; and the dry compressive strength is also low, about 22MPa. Since the initial setting time of the material is too short, the effective mixing time and the flow time are also short, especially the poor fluidity, which...

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 the material is too short, the effective mixing time and flow time are also short, especially the fluidity is poor, which not only causes certain limitations to the operation, but also is not conducive to the trimming of the mold made, especially because of the strength Insufficient, the service life of the mold is also low