阅读说明：本技术 一种适用于钢模的长效混凝土水性脱模剂及其制备方法 (Long-acting concrete water-based release agent suitable for steel die and preparation method thereof ) 是由 高育欣 杨文� 刘明 陈景 袁彬钦 叶子 张磊 于 2019-11-11 设计创作，主要内容包括：本发明属于化学建材技术领域,具体涉及一种适用于钢模的长效混凝土水性脱模剂及其制备方法。针对上述问题,本发明主要是克服现有技术中的不足之处,提供一种适用于钢模的长效混凝土水性脱模剂及其制备方法,包括以下组分：植物油、成膜助剂、复合乳化剂、稳定剂、阻锈剂以及水；所述成膜助剂包括长链烷基硅烷偶联剂和氨丙基三乙氧基硅烷。本发明制备的混凝土水性脱模剂性能稳定,耐水冲刷性好,重复使用性能佳,可以有效改善硬化混凝土的表观质量。(The invention belongs to the technical field of chemical building materials, and particularly relates to a long-acting concrete water-based release agent suitable for a steel die and a preparation method thereof. Aiming at the problems, the invention mainly overcomes the defects in the prior art and provides a long-acting concrete water-based release agent suitable for a steel die and a preparation method thereof, wherein the long-acting concrete water-based release agent comprises the following components: vegetable oil, a film forming auxiliary agent, a composite emulsifier, a stabilizer, a rust inhibitor and water; the film-forming assistant comprises a long-chain alkyl silane coupling agent and aminopropyltriethoxysilane. The concrete water-based release agent prepared by the invention has stable performance, good water scouring resistance and good reusability, and can effectively improve the apparent quality of hardened concrete.)

1. The long-acting concrete water-based release agent suitable for the steel die is characterized by comprising the following components: vegetable oil, a film forming auxiliary agent, a composite emulsifier, a stabilizer, a rust inhibitor and water; the film-forming assistant comprises a long-chain alkyl silane coupling agent and aminopropyltriethoxysilane.

2. The long-acting concrete water-based release agent suitable for the steel die as claimed in claim 1, wherein the compound emulsifier comprises sodium dodecyl benzene sulfonate, span-80 and tween-80.

3. The long-acting concrete water-based release agent suitable for the steel die as claimed in claim 2, wherein the mass ratio of the vegetable oil, the sodium dodecyl benzene sulfonate, the span-80 and the tween-80 is 5-8: 1: 1: 1-2; the amount of the film-forming assistant is 2-8% of the mass of the vegetable oil, and the mass ratio of the vegetable oil to the water is 1: 8-10, wherein the mass ratio of the vegetable oil to the stabilizer is 100: 1, the using amount of the rust inhibitor is 0.1-1% of the mass of the vegetable oil.

4. The long-acting concrete water-based release agent suitable for the steel die as claimed in claim 3, wherein the long-chain alkyl silane coupling agent is a silane coupling agent with a long-chain alkyl carbon chain length of C12-C18.

5. The long-acting concrete water-based release agent suitable for the steel die as claimed in claim 3, wherein the long-chain alkyl silane coupling agent is one or a mixture of dodecyl trimethoxy silane, hexadecyl trimethoxy silane and octadecyl trimethoxy silane, and the molar ratio of the long-chain alkyl silane coupling agent to aminopropyl triethoxy silane is 2-4: 1.

6. the long-acting concrete water-based release agent suitable for the steel die as claimed in claim 4, wherein the rust inhibitor comprises triethanolamine and sodium benzoate.

7. A method of preparing a long acting aqueous release agent for concrete suitable for steel molds according to any one of claims 1 to 6, comprising the steps of:

step S1, uniformly mixing the long-chain alkyl silane coupling agent, the aminopropyl triethoxysilane and the vegetable oil according to a certain proportion, and stirring at constant temperature for 20min to obtain the film-forming aid modified vegetable oil;

s2, mixing the film-forming aid modified vegetable oil obtained in the step S1, sodium dodecyl benzene sulfonate, span-80, tween-80 and a stabilizer, stirring and shearing at constant temperature for 40min at the shearing speed of 3000-4000 r/min, and then adding water to obtain vegetable oil emulsion;

and S3, adding a rust inhibitor into the vegetable oil emulsion obtained in the step S2, uniformly stirring, and adjusting the pH value to 9 to obtain the concrete water-based release agent.

Technical Field

The invention belongs to the technical field of chemical building materials, and particularly relates to a long-acting concrete water-based release agent suitable for a steel die and a preparation method thereof.

Background

The concrete release agent, also called as concrete release agent, is a functional material which is arranged between the template and the concrete and can play a role in isolation and lubrication, and the use of the release agent can effectively reduce the adhesive force between the concrete and the template, so that the concrete can be smoothly separated from the template when the template is removed, and the shape is kept complete and smooth. At present, the types of the release agents at home and abroad are various, and the selection of the excellent and suitable concrete release agent aiming at different use situations is necessary in the building industry. Traditional machine oil, mineral oil or animal and vegetable oil are used as the release agent, although the release effect is good, the use cost is high, the traditional machine oil, mineral oil or animal and vegetable oil is easy to remain on the surface of a concrete product, the pollution is relatively large, and adverse effects are brought to later decoration of concrete.

Compared with the traditional oily release agent, the water-based release agent does not produce pollution and accumulation, does not influence the color of a product when used, is beneficial to reducing internal pores, has a good appearance effect, is relatively clean and environment-friendly, and gradually develops into a substitute of the traditional oily release agent. The aqueous release agent is generally prepared by an emulsification process, and the oil phase is decomposed into tiny droplets by adding a proper emulsifier under stirring, so that the tiny droplets are uniformly dispersed in water to form an emulsion. However, the existing concrete water-based release agent has strong hydrophilicity and poor water scouring resistance, is not suitable for rainy and humid construction environments, is difficult to be repeatedly used in the application process, and further improves the working cost.

Patent CN107603704A discloses a water-based release agent for fair-faced concrete, which has good release effect and good stability, but the reusability and the scouring resistance of the water-based release agent are not evaluated, and the preparation process is complex, and operations such as extraction, reduced pressure distillation, repeated washing, temperature rise and temperature reduction are required.

Patent CN104531309 discloses an aqueous polyurethane concrete release agent, which improves the adhesion fastness of the release agent and has good wear-resistant and washing-resistant performance, but the long-acting performance and the repeated use performance of the release agent are not evaluated. At present, few researches are conducted on long-acting water-based release agents suitable for specific moulds, and the water resistance and long-acting property evaluation effects of most water-based release agents are common.

Therefore, how to simplify the preparation process of the water-based release agent, improve the water scouring resistance of the release agent after film formation, and enhance the adhesion between emulsion particles and a template substrate is the technical key point for preparing the high-quality environment-friendly long-acting water-based release agent.

Disclosure of Invention

Aiming at the problems, the invention mainly overcomes the defects in the prior art and provides the long-acting concrete water-based release agent suitable for the steel die and the preparation method thereof.

The technical scheme provided by the invention for solving the technical problems is as follows: the long-acting concrete water-based release agent suitable for the steel die comprises the following components: vegetable oil, a film forming auxiliary agent, a composite emulsifier, a stabilizer, a rust inhibitor and water; the film-forming assistant comprises a long-chain alkyl silane coupling agent and aminopropyltriethoxysilane; wherein the long-chain alkyl silane coupling agent and the aminopropyltriethoxysilane are used as film forming aids to modify the vegetable oil, so that the long-acting property and the rain wash resistance of the water-based release agent are improved.

The further technical scheme is that the compound emulsifier comprises sodium dodecyl benzene sulfonate, span-80 and tween-80.

The further technical scheme is that the mass ratio of the vegetable oil, the sodium dodecyl benzene sulfonate, the span-80 and the tween-80 is 5-8: 1: 1: 1-2; the amount of the film-forming assistant is 2-8% of the mass of the vegetable oil, and the mass ratio of the vegetable oil to the water is 1: 8-10, wherein the mass ratio of the vegetable oil to the stabilizer is 100: 1, the using amount of the rust inhibitor is 0.1-1% of the mass of the vegetable oil.

The further technical proposal is that the vegetable oil is one or a mixture of more of rapeseed oil, soybean oil, peanut oil and sesame oil.

The further technical scheme is that the long-chain alkyl silane coupling agent is a silane coupling agent with the carbon chain length of long-chain alkyl of C12-C18.

The further technical scheme is that the long-chain alkyl silane coupling agent is one or a mixture of two of dodecyl trimethoxy silane, hexadecyl trimethoxy silane and octadecyl trimethoxy silane, wherein the molar ratio of the long-chain alkyl silane coupling agent to aminopropyl triethoxy silane is 2-4: 1.

the further technical scheme is that the rust inhibitor comprises triethanolamine and sodium benzoate.

A preparation method of a long-acting concrete water-based release agent suitable for a steel die comprises the following steps:

step S1, uniformly mixing the long-chain alkyl silane coupling agent, the aminopropyl triethoxysilane and the vegetable oil according to a certain proportion, and stirring at constant temperature for 20min to obtain the film-forming aid modified vegetable oil;

s2, mixing the film-forming aid modified vegetable oil obtained in the step S1, sodium dodecyl benzene sulfonate, span-80, tween-80 and a stabilizer, stirring and shearing at constant temperature for 40min at the shearing speed of 3000-4000 r/min, and then adding water to obtain vegetable oil emulsion;

and S3, adding a rust inhibitor into the vegetable oil emulsion obtained in the step S2, uniformly stirring, and adjusting the pH value to 9 to obtain the concrete water-based release agent.

Compared with the prior art, the invention has the following beneficial effects:

(1) the long-chain alkyl silane coupling agent and the aminopropyltriethoxysilane are used as main film-forming aids to modify the vegetable oil, so that the coating performance and the isolation lubricating performance of the vegetable oil on the surface of a steel die are enhanced;

(2) the film-forming additive has the advantages that silicon-oxygen bonds in the molecular structure of the film-forming additive are hydrolyzed to form silicon hydroxyl groups, the silicon hydroxyl groups and the active hydroxyl groups of steel react to form chemical bonds, a chemical adsorption film is formed on the surface of the steel, the adhesion is strong, the film forming is firm, the corrosion resistance effect can be achieved, the compatibility between the film-forming additive and vegetable oil is enhanced due to the long-chain alkyl structure contained at the other end, emulsion particles with good dispersibility can be obtained, and meanwhile, the hydrophobic property of the surface of the film layer. (ii) a

(3) The method for preparing the water-based release agent is simple and easy to operate, and the conditions are controllable;

(4) the concrete long-acting water-based release agent disclosed by the invention is firmly adhered to a template, does not need to be coated again after being used, can effectively reduce a release process, is high in reuse rate, and is suitable for a continuous construction environment;

(5) the concrete water-based release agent disclosed by the invention is good in surface hydrophobic property after being formed into a film, has stronger water scouring resistance, and solves the problem of construction difficulty in humid rainy days;

(6) the long-acting concrete water-based release agent can effectively improve the apparent quality of concrete, the surface of the concrete is basically free of bubbles, and the phenomenon of honeycomb pitted surface is obviously reduced.

Detailed Description

The present invention will be further described with reference to the following examples.

First, concrete water-based release agent preparation method embodiment