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CN-122010494-A - Glass fiber modified rubber mortar

CN122010494ACN 122010494 ACN122010494 ACN 122010494ACN-122010494-A

Abstract

The invention relates to glass fiber modified rubber mortar, which belongs to the technical field of building materials, and comprises the steps of carrying out irradiation grafting modification on regenerated rubber powder in the mortar, loading the modifier on the surface of the rubber powder after irradiation grafting modification, effectively improving the hydrophilicity of the modified regenerated rubber powder by sulfonic acid groups on the surface of the modified regenerated rubber powder when the mortar is mixed, ensuring that the modified regenerated rubber powder can be fully soaked by the mortar, reducing the repulsive force of the modified regenerated rubber powder and cement mortar, thereby reducing interface pores in the mortar and improving the fluidity and dispersibility of the mortar, further playing the role of improving the heat insulation performance of the mortar, and further forming stable chemical bonding with silicate cement hydration products after the mortar is solidified, so that an interface transition zone is more compact, and the mechanical anchoring and stress transmission effects after the mortar is solidified are effectively enhanced.

Inventors

  • LIU FENG
  • ZHAO MINGXIN
  • CHEN ZEPENG
  • WANG JIAHUI
  • DENG JUNJIE
  • ZHU YUHAO
  • TANG ZHENXING

Assignees

  • 广州航海学院
  • 广东工业大学
  • 佛山大学

Dates

Publication Date
20260512
Application Date
20260213

Claims (10)

  1. 1. The glass fiber modified rubber mortar is characterized by comprising river sand, portland cement, modified regenerated rubber powder, alkali-resistant glass fiber, fly ash, a water reducing agent and water; Wherein the modified reclaimed rubber powder is prepared by the following steps: s1, carrying out nucleophilic substitution reaction on 2-amino-2-methylpropane-1-sulfonic acid and 3-chloropropyl triethoxysilane to obtain a modifier precursor; s2, carrying out nucleophilic substitution reaction on the modifier precursor and vinyl phosphoryl chloride to obtain a modifier; S3, loading the modifier on the surface of the regenerated rubber powder subjected to alkali treatment in a radiation grafting mode to obtain the modified regenerated rubber powder.
  2. 2. The glass fiber modified rubber mortar of claim 1, which is characterized by comprising the following raw materials, by mass, 2800-3500 parts of river sand, 1300-1500 parts of Portland cement, 280-350 parts of modified recycled rubber powder, 15-35 parts of alkali-resistant glass fiber, 50-100 parts of fly ash, 12-15 parts of a water reducer and 700-720 parts of water.
  3. 3. The glass fiber-modified rubber mortar according to claim 1, wherein the reaction conditions in S1 are: Mixing 2-amino-2-methylpropane-1-sulfonic acid, 3-chloropropyl triethoxysilane and N, N-dimethylformamide, reacting for 2-6 hours at the temperature of 100-120 ℃, pouring the reaction liquid into petroleum ether to precipitate after the reaction is finished, and filtering and separating the precipitate to obtain the modifier precursor.
  4. 4. The glass fiber-modified rubber mortar according to claim 1, wherein the reaction conditions in S2 are: mixing a modifier precursor, vinyl phosphoryl chloride, triethylamine and acetonitrile, reacting for 1-4 hours at the temperature of 55-75 ℃, filtering and separating solid after the reaction is finished, pouring the residual filtrate into petroleum ether for precipitation, and filtering and separating precipitate to obtain the modifier.
  5. 5. The glass fiber-modified rubber mortar according to claim 1, wherein the reaction conditions in S3 are: And (3) carrying out alkali treatment on the rubber powder to obtain alkali-treated regenerated rubber powder, mixing the alkali-treated regenerated rubber powder, a modifier, toluene and N, N-dimethylformamide, placing the mixture in an irradiation grafting tube for electron beam irradiation grafting, and filtering and separating solid after the irradiation grafting is finished, washing the obtained solid with absolute ethyl alcohol, and drying to obtain the modified regenerated rubber powder.
  6. 6. The glass fiber modified rubber mortar according to claim 3, wherein the mass ratio of the 2-amino-2-methylpropane-1-sulfonic acid to the 3-chloropropyl triethoxysilane used in S1 is 20-25:36-45.
  7. 7. The glass fiber modified rubber mortar of claim 4, wherein the mass ratio of the modifier precursor used in S2 to vinyl phosphoryl chloride is 40-50:8-10.
  8. 8. The glass fiber modified rubber mortar according to claim 5, wherein the mass ratio of the modifier used in S3 to the regenerated rubber powder after alkali treatment is 28-35:280-350.
  9. 9. The glass fiber-modified rubber mortar according to claim 5, wherein the alkali treatment conditions are: Mixing the reclaimed rubber powder and a sodium hydroxide aqueous solution with the mass fraction of 5-10%, treating for 30-60 min at room temperature, filtering out solids after alkali treatment is finished, washing the obtained solids with deionized water, and drying to obtain the reclaimed rubber powder after alkali treatment.
  10. 10. The glass fiber modified rubber mortar of claim 1, wherein the mass ratio of the regenerated rubber powder to the 5-10% sodium hydroxide aqueous solution in the alkali treatment step is 300-360:1500-1800.

Description

Glass fiber modified rubber mortar Technical Field The invention belongs to the technical field of building materials, and particularly relates to glass fiber modified rubber mortar. Background The cement mortar is prepared from cement, fine aggregate and water according to the requirements, and is used for building foundation and wall bodies, as an adhesive for block masonry materials and used for plastering indoors and outdoors in the construction engineering. In recent years, the requirements for building materials are increasingly developed towards high strength, high performance and compounding, so that the requirements for cement mortar performance are also increasingly high, and the disadvantages of toughness, durability and other performances are also increasingly prominent. The rubber is added into the cement mortar to improve the durability and brittleness of the cement mortar, and the cement mortar has positive effects on the heat insulation performance of the mortar, but the inherent strong hydrophobicity of the surface of the rubber powder leads to poor compatibility with the hydrophilic cement mortar, is difficult to sufficiently wet in the mixing process, is easy to introduce interface defects and pores and seriously deteriorates the mechanical strength of the material, and secondly, the rubber particles and the hard cement hydration products have huge modulus difference and weak interface combination, are easy to become stress concentration points when stressed, and lead to early occurrence of damage. On the other hand, the incorporation of alkali-resistant glass fibers is another effective means of improving crack resistance and toughness of cement-based materials. The fibers can bridge the crack in the matrix, preventing it from propagating. However, the glass fiber has smooth surface and chemical inertness, and is mainly anchored by physical and mechanical, the chemical bonding force is weak, the glass fiber is easy to pull out or slip damage under high stress, the reinforcing potential cannot be fully exerted, and the glass fiber modified rubber mortar is provided for solving the technical defects. Disclosure of Invention The invention aims to provide glass fiber modified rubber mortar which is used for solving the problems in the background technology. The aim of the invention can be achieved by the following technical scheme: The glass fiber modified rubber mortar comprises, by mass, 2800-3500 parts of river sand, 1300-1500 parts of silicate cement, 280-350 parts of modified recycled rubber powder, 15-35 parts of alkali-resistant glass fiber, 50-100 parts of fly ash, 12-15 parts of a water reducer and 700-720 parts of water. Further, the modified reclaimed rubber powder is prepared by the following steps: s1, carrying out nucleophilic substitution reaction on 2-amino-2-methylpropane-1-sulfonic acid and 3-chloropropyl triethoxysilane to obtain a modifier precursor; s2, carrying out nucleophilic substitution reaction on the modifier precursor and vinyl phosphoryl chloride to obtain a modifier; S3, loading the modifier on the surface of the regenerated rubber powder subjected to alkali treatment in a radiation grafting mode to obtain the modified regenerated rubber powder. Further, the reaction conditions in S1 are: Mixing 2-amino-2-methylpropane-1-sulfonic acid, 3-chloropropyl triethoxysilane and N, N-dimethylformamide, reacting for 2-6 hours at the temperature of 100-120 ℃, pouring the reaction liquid into petroleum ether to precipitate after the reaction is finished, and filtering and separating the precipitate to obtain the modifier precursor. Further, the reaction conditions in S2 are: mixing a modifier precursor, vinyl phosphoryl chloride, triethylamine and acetonitrile, reacting for 1-4 hours at the temperature of 55-75 ℃, filtering and separating solid after the reaction is finished, pouring the residual filtrate into petroleum ether for precipitation, and filtering and separating precipitate to obtain the modifier. Further, the reaction conditions in S3 are: And (3) carrying out alkali treatment on the rubber powder to obtain alkali-treated regenerated rubber powder, mixing the alkali-treated regenerated rubber powder, a modifier, toluene and N, N-dimethylformamide, placing the mixture in an irradiation grafting tube for electron beam irradiation grafting, and filtering and separating solid after the irradiation grafting is finished, washing the obtained solid with absolute ethyl alcohol, and drying to obtain the modified regenerated rubber powder. Further, the conditions of the alkali treatment are as follows: Mixing the reclaimed rubber powder and a sodium hydroxide aqueous solution with the mass fraction of 5-10%, treating for 30-60 min at room temperature, filtering out solids after alkali treatment is finished, washing the obtained solids with deionized water, and drying to obtain the reclaimed rubber powder after alkali treatment. Further, the mass ratio of the 2-amino-2-me