Concrete protection paint and preparation method thereof

A concrete and coating technology, applied in the direction of coating, etc., can solve the problems of up to 30-50 yuan, peeling off during service, poor protection effect, etc., and achieve the effects of convenient operation, reduced carbonization, and reduced hydrophilicity

Active Publication Date: 2013-02-20
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent 200610029739 discloses a method of using sodium silicate to close capillary pores, but due to poor protective effect, it has gradually withdrawn from the market in recent years; epoxy resin and polyurethane protection are also commonly used protective measures in engineering. The effect is excellent, and it can effectively isolate the erosion of carbon dioxide and chloride ions. However, the two main problems faced by this technology are: ① high cost, as high as 30-50 yuan per square meter; ② serious peeling phenomenon in the service process
Patent USP5623014 discloses a method of using carbonyl (aldehyde group) and hydrazine group to achieve room temperature crosslinking, which can effectively reduce the penetration of carbon dioxide and chloride ions, but due to the introduction of a large number of hydrophilic groups, under freeze-thaw environmental conditions, Membrane cracks easily, resulting in reduced performance

Method used

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  • Concrete protection paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of monomer emulsion

[0039] Under the condition of mechanical stirring, 20g methyl methacrylate, 20g butyl methacrylate, 2.5g vinyl propyl ketone, 2.5g vinyl ethyl ketone and 2.5g vinyl triethoxysilane were added dropwise to 1.8g nonyl In the emulsifier aqueous solution that base phenol polyoxyethylene ether (20EO), 0.2g sodium lauryl sulfonate and 20g water make, emulsification prepares stable monomer emulsion;

[0040] (2) Preparation of polymer emulsion

[0041] Use 0.18g nonylphenol polyoxyethylene ether (20EO), 0.02g sodium dodecylsulfonate and 18g water as the bottom solution, and add sodium bicarbonate to adjust the pH to 7.2; at the same time, dissolve 0.5g potassium persulfate in 9.07 g water, and under the condition of 75°C, dropwisely add the monomer emulsion into the base solution synchronously, the dropwise addition is completed within 3h, continue the reaction for 1h, and keep the temperature at 85°C for half an hour to prepare the polyme...

Embodiment 2

[0045] (1) Preparation of monomer emulsion

[0046] Under the condition of mechanical stirring, 25g styrene, 23g butyl methacrylate, 1g ethylene ethyl ketone, 0.5g vinyltrimethoxysilane were added dropwise to 1.8g nonylphenol polyoxyethylene ether (10EO), 0.2 In the aqueous emulsifier aqueous solution that 1g sodium lauryl sulfate and 20g water are made, emulsification prepares stable monomer emulsion;

[0047] (2) Preparation of polymer emulsion

[0048] Use 0.18g nonylphenol polyoxyethylene ether (10EO), 0.02g sodium lauryl sulfate and 18g water as the bottom solution, and add sodium bicarbonate to adjust the pH to 7.4; at the same time, dissolve 0.5g potassium persulfate in 9.07g In water, and under the condition of 75°C, dropwisely add the monomer emulsion into the base solution synchronously, the dropwise addition is completed within 3h, continue the reaction for 1h, and keep the temperature at 85°C for half an hour to prepare the polymer emulsion; add 0.5g oxalic acid ...

Embodiment 3

[0052] (1) Preparation of monomer emulsion

[0053] Under mechanical stirring conditions, 20g methyl methacrylate, 20g butyl methacrylate, 2.5g octyl methacrylate, 4g vinyl propyl ketone and 1.5g vinyl trimethoxysilane were added dropwise to 1.8g nonyl In the emulsifier aqueous solution that phenol polyoxyethylene ether (10EO), 0.2g sodium oleate and 20g water make, emulsification prepares stable monomer emulsion;

[0054] (2) Preparation of polymer emulsion

[0055] Use 0.18g nonylphenol polyoxyethylene ether (10EO), 0.02g sodium oleate and 18g water as the base solution, and add sodium bicarbonate to adjust the pH to 7.6; at the same time, dissolve 0.5g potassium persulfate in 9.07g water, and At 75°C, dropwisely add the monomer emulsion into the base solution synchronously, the dropwise addition is completed within 3 hours, continue the reaction for 1 hour, and keep warm at 85°C for half an hour to prepare a polymer emulsion; Hydrazine is dissolved in the polymer emulsion...

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Abstract

The invention relates to a concrete protection paint which comprises the following raw materials in parts by weight: 60-96 parts of vinyl-containing monomer, 2-20 parts of carbonyl/formyl-containing vinyl monomer and 1-10 parts of diazanyl-containing monomer. The preparation method comprises the following steps: under stirring conditions, mixing and dropwisely adding vinyl monomer, carbonyl/formyl-containing vinyl monomer and a silane coupling agent into an emulsifier water solution to obtain a monomer emulsion; synchronously and dropwisely adding an initiator water solution and the monomer emulsion into a base solution at 50-90 DEG C to carry out emulsion polymerization, and adding diazanyl-containing monomer to obtain a polymer emulsion; and evenly mixing the polymer emulsion with a film-forming assistant, a plasticizer, a leveling agent, a defoaming agent and water to obtain the concrete protective paint. The invention solves the problem of lower water resistance when the traditional ambient crosslinking material is used for concrete protection, and can effectively lower the concrete carbonization and chloride ion permeability; and the film can not easily crack in a freeze-thawing environment.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a concrete protective material with hydrophobic room-temperature crosslinking characteristics and a preparation method thereof. Background technique [0002] During its service, concrete is exposed to the erosion of many harmful media, especially carbon dioxide and chloride ions. The cracking problem caused by the corrosion and expansion of steel bars caused by carbon dioxide and chloride ion erosion is a common problem in engineering, which seriously reduces the durability and service life of concrete. The current method to solve this problem mainly includes the following three aspects: 1. In the process of concrete preparation, strengthen quality control to avoid the decrease of concrete density caused by raw materials, especially the occurrence of cracking; 2. After concrete pouring, strengthen Maintenance measures to ensure that the cement can be fully hydrated and increase t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/12C09D125/14C09D133/08C08F220/14C08F220/18C08F216/36C08F230/08C08F212/08
Inventor 李磊刘加平田倩王文彬孙帅王洪松
Owner JIANGSU SOBUTE NEW MATERIALS
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