阅读说明：本技术 一种预制构件混凝土用脱模剂及制备方法 (Release agent for prefabricated part concrete and preparation method thereof ) 是由 倪锐 仇影 胡凯伟 刘子毅 于浩 沈学涛 于 2019-09-23 设计创作，主要内容包括：本发明涉及一种预制构件混凝土用脱模剂及制备方法,属于混凝土外加剂应用领域。所述预制构件混凝土用脱模剂为水分散溶液,由如下质量百分含量的组分制备而成：有机改性硅烷30％～42％、酰胺类磷酸酯12％～18％、有机胺5％～8％、乳化剂2％～6％、水30％～40％。本发明能够有效地改善清水混凝土水泥制品的外观效果,使其表面光滑无气泡,是一种预制构件混凝土用脱模剂,可稀释1～5倍使用、工艺简单、性能稳定。(The invention relates to a release agent for precast concrete and a preparation method thereof, belonging to the field of application of concrete admixtures. The release agent for the precast concrete is an aqueous dispersion solution and is prepared from the following components in percentage by mass: 30-42% of organic modified silane, 12-18% of amide phosphate, 5-8% of organic amine, 2-6% of emulsifier and 30-40% of water. The invention can effectively improve the appearance effect of the fair-faced concrete cement product, ensures that the surface of the product is smooth and bubble-free, is a release agent for prefabricated member concrete, can be diluted by 1-5 times for use, and has simple process and stable performance.)

1. The release agent for the concrete of the prefabricated part is characterized by comprising the following raw material components in percentage by mass based on the total amount of the raw materials:

2. the release agent for precast concrete according to claim 1, characterized in that the organic modified silane is obtained by crosslinking reaction of raw materials of nano silica, polydimethylsiloxane-vinyl polydimethylsiloxane crosslinked polymer at 30-60 ℃ for 1-3 h under the action of benzoyl peroxide.

3. The release agent for precast concrete according to claim 2, characterized in that the raw materials for preparing the organically modified silane are in the following mass ratio: 30-51.5% of nano silicon dioxide, polydimethylsiloxane-vinyl polydimethylsiloxane cross-linked polymer: 48 to 69.5 percent of the total weight of the composition and 0.2 to 0.5 percent of benzoyl peroxide.

4. A precast concrete release agent according to claim 1, wherein the amide phosphate is at least one of alkyl diethanolamide phosphate, lauric acid monoethanolamide phosphate, or coconut monoethanolamide polyoxyethylene ether phosphate.

5. The mold release agent for precast concrete according to claim 1, wherein the organic amine is at least one of triethylenediamine, N-dimethylethanolamine, or ethylenediamine.

6. The release agent for precast concrete according to claim 1, wherein the emulsifier is at least one of alkylamine polyoxyethylene ether, rosin acid polyoxyethylene ester, or sorbitan trioleate.

7. A method for preparing the release agent for precast concrete according to claim 1, comprising the specific steps of: firstly, dissolving organic modified silane in water, heating, uniformly stirring, adding amide phosphate, organic amine and an emulsifier, stirring, and naturally cooling to obtain the release agent for the prefabricated member concrete.

8. The method according to claim 7, characterized in that the temperature is raised to 20-40 ℃; the stirring time is 1 to 3 hours.

Technical Field

The invention relates to the field of concrete admixture application, in particular to a release agent for precast concrete and a preparation method thereof.

Background

Because the prefabricated parts have higher requirements on the turnover efficiency of the mould, and a plurality of parts are special-shaped parts, the requirements on the performance and the demoulding of the concrete are very high, the prefabricated parts have proper plasticity, and the appearance quality problem of the concrete product cannot be caused by the unfavorable demoulding. The precast concrete of cement products receives more and more attention from people in the field of buildings, and in order to accelerate the mold rotation speed of the cement products in engineering, protect a template from corrosion and require that the appearance effect after demolding is smoother, the surface is complete and bubble-free, and the texture is excellent, the selection of a proper demolding agent is essential for the preparation of precast concrete.

At present, pure oil release agents (mineral oil, animal oil or vegetable oil) are often used, but the pure oil release agents only have the function of smoothly separating concrete and a mould, and the condition of a hornet nest on the surface of the concrete is difficult to improve. The concrete release agent is prepared from lard, rosin, sodium hydroxide, an emulsifier, tributyl phosphate, formaldehyde, dodecyl betaine and a proper amount of organic montmorillonite in an aqueous solution, and the method requires saponification reaction at 95-105 ℃, has harsh process conditions, contains formaldehyde and is not beneficial to environmental protection requirements. The invention discloses an environment-friendly concrete prefabricated part release agent and a preparation method thereof, wherein the release agent is prepared from the following raw materials in parts by weight: demoulding oil: the water is 1: 2-1: 8, and the demolding oil consists of ester oil substances, grease, membrane reactants, an interface isolating agent, an emulsifier and a defoaming agent. The invention adopts advanced reaction film forming technology, has the advantages of good demoulding effect, smooth member surface, no large amount of air holes, no surface layer ash, no residual concrete in the steel mould, convenient cleaning, no corrosion of the demoulding agent to the steel mould and the like. But the reaction film-forming technology has great industrialization difficulty and is not beneficial to popularization.

Disclosure of Invention

The invention aims to disclose a release agent for precast member concrete, and the invention also aims to disclose a preparation method of the release agent for precast member concrete; the process is simple to operate, is a water-based release agent used on a prefabricated member template of a concrete cement product, and utilizes the low viscosity of the release agent and the action of eliminating air bubbles on the surface of concrete, so that the appearance of the concrete product achieves the aims of consistent structure surface color and flat and smooth appearance.

The technical scheme of the invention is as follows: the release agent for the concrete of the prefabricated part is characterized by comprising the following raw material components in percentage by mass based on the total amount of the raw materials:

preferably, the organic modified silane is prepared by crosslinking reaction of nano silicon dioxide and polydimethylsiloxane-vinyl polydimethylsiloxane crosslinked polymer at 30-60 ℃ for 1-3 h under the action of benzoyl peroxide; the preparation method of the organic modified silane comprises the following steps of: 30-51.5% of nano silicon dioxide, polydimethylsiloxane/vinyl polydimethylsiloxane cross-linked polymer: 48 to 69.5 percent of the total weight of the composition and 0.2 to 0.5 percent of benzoyl peroxide.

Preferably, the amide phosphate is at least one of alkyl diethanolamide phosphate, lauric acid monoethanolamide phosphate, or coco monoethanolamide polyoxyethylene ether phosphate.

Preferably, the organic amine is at least one of triethylene diamine, N-dimethylethanolamine or ethylenediamine.

Preferably, the emulsifier is at least one of alkylamine polyoxyethylene ether, rosin acid polyoxyethylene ester or sorbitan trioleate.

The invention also provides a method for preparing the release agent for the precast concrete, which comprises the following specific steps: firstly, dissolving organic modified silane in water, heating, uniformly stirring, adding amide phosphate, organic amine and an emulsifier, stirring, and naturally cooling to obtain the release agent for the prefabricated member concrete. Preferably, the temperature is increased to 20-40 ℃; the stirring time is 1 to 3 hours. The prepared release agent is an aqueous dispersion solution and can be diluted by 1-5 times for use.

Has the advantages that:

according to the invention, the organic modified silane is crosslinked and modified by utilizing the quantum tunneling effect of the nano silicon dioxide, so that the silane has a unique dispersion effect, the coating performance and the lubricating performance of the silane are obviously enhanced after the silane reacts with the emulsifier, the surface is uniform and has no color difference after demolding, bubbles on the surface of concrete are greatly eliminated by adding the amide phosphate, and the appearance effect of the concrete prefabricated part is improved. The release agent disclosed by the invention has the advantages of no layering phenomenon, simple preparation process, environment-friendly and pollution-free raw materials, and suitability for precast concrete.

Detailed Description

Example 1

Preparation of organically modified silane: 300g of nano silicon dioxide and 695g of polydimethylsiloxane/vinyl polydimethylsiloxane cross-linked polymer are placed at the temperature of 30 ℃ and stirred uniformly, 5g of benzoyl peroxide is added to carry out cross-linking reaction for 3 hours, and the nano silicon dioxide/vinyl polydimethylsiloxane cross-linked polymer is obtained.

Preparation of the release agent: firstly, dissolving 300g of organic modified silane in 380g of water, heating to 20 ℃, uniformly stirring, adding 180g of alkyl diethanol amide phosphate, 80g N, N-dimethylethanolamine and 60g of sorbitan trioleate, stirring for 1h, and naturally cooling to obtain the release agent for the prefabricated member concrete.

The release agent is subjected to JC/T945-2005 standard test on release performance, and the adhesion amount of the concrete after release is 2.3g/m²The paint has no rust to steel dies, the viscosity of 73.2mPa.s, and the appearance of the paint is smooth and free of bubbles.

Example 2

Preparation of organically modified silane: 430g of nano silicon dioxide and 568g of polydimethylsiloxane/vinyl polydimethylsiloxane cross-linked polymer are placed at the temperature of 60 ℃ and stirred uniformly, and 2g of benzoyl peroxide is added to carry out cross-linking reaction for 1 hour to obtain the nano silicon dioxide/vinyl polydimethylsiloxane cross-linked polymer.

Preparation of the release agent: firstly, dissolving 420g of organic modified silane in 360g of water, heating to 30 ℃, uniformly stirring, adding 120g of lauric acid monoethanolamide phosphate, 60g of triethylene diamine and 40g of alkylamine polyoxyethylene ether, stirring for 3h, and naturally cooling to obtain the release agent for the precast concrete.

The release agent is subjected to JC/T945-2005 standard test on release performance, and the adhesion amount of the concrete after release is 2.6g/m²The paint has no rust to steel dies, the viscosity of 76.8mPa.s, and the appearance of the paint is smooth and free of bubbles.

Example 3

Preparation of organically modified silane: 515g of nano silicon dioxide and 480g of polydimethylsiloxane/vinyl polydimethylsiloxane cross-linked polymer are placed at the temperature of 50 ℃ and stirred evenly, 5g of benzoyl peroxide is added to carry out cross-linking reaction for 2h, and the nano silicon dioxide/vinyl polydimethylsiloxane cross-linked polymer is obtained.

Preparation of the release agent: firstly, dissolving 380g of organic modified silane in 400g of water, heating to 40 ℃, uniformly stirring, adding 150g of coconut oil based monoethanolamide polyoxyethylene ether phosphate, 50g of ethylenediamine and 20g of rosin acid polyoxyethylene ester, stirring for 1h, and naturally cooling to obtain the release agent for the prefabricated member concrete.

The release agent is subjected to JC/T945-2005 standard test on release performance, and the adhesion amount of concrete after release is 3.1g/m²The paint has no rust to steel die, viscosity of 81.8mPa.s, and smooth appearance without bubbles.

Example 4

Preparation of organically modified silane: 397g of nano silicon dioxide and 600g of polydimethylsiloxane/vinyl polydimethylsiloxane cross-linked polymer are placed at the temperature of 40 ℃ to be uniformly stirred, and 3g of benzoyl peroxide is added to carry out cross-linking reaction for 3 hours to obtain the silicon dioxide nano silicon dioxide cross-linked polymer.

Preparation of the release agent: firstly, 390g of organic modified silane is dissolved in 300g of water, the temperature is raised to 40 ℃, 180g of lauric acid monoethanolamide phosphate, 70g N, N-dimethylethanolamine and 60g of rosin acid polyoxyethylene ester are added after uniform stirring, and the demolding agent for precast concrete is obtained after stirring for 1h and natural cooling.

The release agent is subjected to JC/T945-2005 standard test on release performance, and the adhesion amount of the concrete after release is 2.6g/m²The paint has no rust to steel dies, the viscosity of the paint is 71.8mPa.s, and the appearance of the paint is smooth and free of bubbles.