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Polymer anti-crack mortar

An anti-cracking mortar and polymer technology, applied in the field of construction mortar, can solve the problems of poor dispersion, easy agglomeration, and affecting durability, so as to improve crack resistance, comprehensive performance, compressive strength and flexural strength Effect

Inactive Publication Date: 2020-06-19
北京海普斯建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since mortar is used as a protective layer of building materials, with the change of climate and the extension of time, the mortar layer is prone to cracks, which affects the life of the building. In order to improve the crack resistance of the mortar, fiber materials are usually added to the mortar to Improve the durability of the mortar layer; the existing reinforcing fibers are generally steel fibers, glass fibers and polymer fibers, because steel fibers are easy to agglomerate in cement, have poor dispersion and high cost, and glass fibers will react with alkaline substances , affect its durability, so the polymer fiber with low price and better comprehensive performance is more widely used; among them, the most used polymer fiber is polypropylene fiber, and the addition of polypropylene fiber helps to improve the early shrinkage crack of mortar. performance and tensile strength, but as the content of polypropylene fiber increases, the compressive strength and flexural strength of the mortar decrease, so if the crack resistance of the mortar can be improved, its compressive strength can also be improved Strength, as well as flexural strength, is a problem to be solved

Method used

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Examples

Experimental program
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Effect test

preparation example 1

[0038] ①Pretreatment: Immerse 2kg of polypropylene fibers with a length of 3mm in 5kg and 1wt% sodium hypochlorite solution for 30s at a temperature of 60°C; then immerse the polypropylene fibers in 20kg of N with a weight ratio of 1:3, Soak in the mixture of N-dimethylacrylamide and acetone for 10 minutes;

[0039] ②Chemical modification: Add 0.6kg of aminopropyltrimethoxysilane and 0.4kg of diacetone acrylamide to 30kg, 70wt% ethanol solution, heat up to 40°C, stir for 10min, and then add poly For acrylic fibers, stir for 1 hour at a temperature of 40°C, then stop heating, let it cool to room temperature and continue soaking for 16 hours;

[0040]③Washing and drying: Take out the polypropylene fiber treated in step ②, wash it with 10wt% ethanol solution for 5min, the flow rate of the ethanol solution is 20mL / min, and place the washed polypropylene fiber at a temperature of 90°C , After drying for 4 hours, the modified polypropylene fiber was obtained.

preparation example 2

[0042] ①Pretreatment: Immerse 2kg of polypropylene fibers with a length of 6mm in 6kg of 1.5wt% sodium hypochlorite solution for 35s at a temperature of 65°C; then immerse the polypropylene fibers in 24kg of N with a weight ratio of 1:3 , soaked in a mixture of N-dimethylacrylamide and acetone for 15 minutes;

[0043] ②Chemical modification: Add 0.7kg of aminopropyltrimethoxysilane and 0.5kg of diacetone acrylamide to 35kg of 80wt% ethanol solution, heat up to 45°C, stir for 15min, then add poly Propylene fiber, at a temperature of 45°C, stir for 1.5h, then stop heating, let it cool to room temperature and continue soaking for 17h;

[0044] ③Washing and drying: Take out the polypropylene fiber treated in step ②, rinse it with 30wt% ethanol solution for 7.5min, the flow rate of the ethanol solution is 25mL / min, and place the washed polypropylene fiber at a temperature of 95°C After drying for 5 hours, modified polypropylene fibers were obtained.

preparation example 3

[0046] ①Pretreatment: Immerse 2kg of polypropylene fibers with a length of 9mm in 7kg and 2wt% sodium hypochlorite solution for 40s at a temperature of 70°C; then immerse the polypropylene fibers in 28kg of N with a weight ratio of 1:3, Soak in a mixture of N-dimethylacrylamide and acetone for 20 minutes;

[0047] ②Chemical modification: Add 0.8 kg of aminopropyltrimethoxysilane and 0.6 kg of diacetone acrylamide to 40 kg of 90 wt % ethanol solution, heat up to 50 ° C, stir for 20 min, and then add poly Propylene fibers, at a temperature of 50 ° C, stirred for 2 hours, then stopped heating, allowed to cool to room temperature and continued to soak for 18 hours;

[0048] ③Washing and drying: Take out the polypropylene fiber treated in step ②, wash it with 50wt% ethanol solution for 10min, the flow rate of the ethanol solution is 30mL / min, and place the washed polypropylene fiber at a temperature of 100°C , After drying for 6 hours, the modified polypropylene fiber was obtained...

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Abstract

The invention discloses polymer anti-crack mortar, and belongs to the technical field of building mortar. The polymer anti-crack mortar comprises cement, fine aggregate, cellulose ether, modified polypropylene fiber and redispersible latex powder, wherein polypropylene fibers are subjected to pretreatment, chemical modification, washing and drying to obtain the modified polypropylene fibers, aminopropyltrimethoxysilane and diacetone acrylamide are used for modifying the polypropylene fibers in the chemical modification, the modified polypropylene fibers can effectively improve the crack resistance, the impermeability and the tensile strength of mortar, and the modified polypropylene fibers have the increased bonding strength with cement, can improve the dispersity of all the raw materialsof the mortar, and can improve the compressive strength and the rupture strength of the mortar while micro-cracks are inhibited from being generated in the mortar, so that the comprehensive performance of the mortar is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of building mortars, in particular to a polymer anti-cracking mortar. Background technique [0002] Mortar is made of cementitious material, fine aggregate and water in a certain proportion. The difference between mortar and concrete is that it does not contain coarse aggregate. According to the use of mortar, it can be divided into masonry mortar and plastering mortar. Mortar is used for masonry and component installation of bricks, stones, blocks, etc.; plastering mortar is used for plastering surfaces such as walls, floors, roofs, and beam-column structures to meet protection and decoration requirements; according to Beijing local Standard DB11 / T644-2009 "Technical Regulations for External Thermal Insulation of Exterior Walls", polymer mortar is used for the protective layer on the external surface of external thermal insulation system; polymer mortar is a new type of building material emerging in recent ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2111/343C04B2201/50C04B14/06C04B24/383C04B16/0633C04B24/26C04B22/12C04B24/008C04B24/124C04B24/42
Inventor 张立君卫长顺韩国柱
Owner 北京海普斯建材有限公司
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