Vegetable oil-based concrete mold-release agent and preparation method thereof

Abstract

The invention discloses a vegetable oil-based concrete mold-release agent and a preparation method thereof. Raw materials (in parts by weight) for preparing the mold-release agent comprise 100 to 150parts of vegetable oil, 150 to 300 parts of water, 2 to 3 parts of oleic acid, 2 to 5 parts of preservative, 5 to 15 parts of PEG (Polyethylene Glycol), 3 to 5 parts of laccase, 1 to 3 parts of hydrophobic nano SiO2 particles and 50 to 65 parts of aluminum isopropoxide. Laccase is inoculated into a bagasse culture medium through aspergillus oryzae, and the mold-release agent is prepared accordingto a set process. Oleic acid is used for adjusting the pH value of the mold-release agent, and vegetable oil is one of castor oil, tung oil and Chinese tallow kernel oil. The preparation process comprises six steps of preparing laccase, selectively oxidizing vegetable oil by using the laccase, conducting modifying, conducting refining, conducting reducing by using aluminum isopropoxide, adding hydrophobic SiO2 particles and conducting emulsifying. The obtained vegetable oil-based concrete mold-release agent is a release agent capable of forming a hydrophobic physical structure and a hydrophobic coating at the same time, and an unexpected mold-release effect can be achieved compared with a traditional release agent.

Description

technical field [0001] The invention relates to a vegetable oil-based concrete release agent and a preparation method thereof. Specifically, plant castor oil is modified to have self-emulsifying ability, thereby reducing the amount of emulsifier, improving the release effect, and adding additives to make the It can improve the early strength of concrete and belongs to the technical field of concrete release agent. Background technique [0002] The release agent is a must-use material in the process of pouring concrete in the construction industry. Mineral oil or vegetable oil is used to make the release agent. The basic requirement is that the raw materials for the preparation of the release agent need to be easy to obtain, do not pollute the environment, can be recycled, and have no harm to construction personnel. , will not affect the performance of concrete products, let alone compete with others. Existing such as Chinese patent " a kind of concrete release agent " (CN10...

AI Technical Summary

Problems solved by technology

Existing such as Chinese patent " a kind of concrete release agent " (CN108219910A) disclosed, is mineral oil-based emulsified oil type release agent and preparation method thereof, mineral oil, emulsifier, stabilizer, defoamer and synthetic Membrane additives and other additives are prepared by simple mixing and homogenization. The base oil is mineral oil. Its disadvantages are: it is difficult to biodegrade and not environmentally friendly; Chinese patent "a POSS modified vegetable oil emulsion release agent and its preparation The release agent described in "Method" (CN102504924A) is based on rapeseed oil base, and is obtained by adding emulsifier, defoamer and stabilizer. property, while using edible rapeseed oil, a waste of food resources; Chinese patent "concrete release agent and production method" (CN107118836A) discloses a release agent with animal oil as a matrix, saponification reaction, obtained soaps Release agent, and add emulsifier, preservative and defoamer etc., its weak point is: the animal fat price that adopts is higher, and economy is relatively poor; Chinese patent " a kind of concrete member release agent " (CN106003236A ) The production process not only uses a large amount of mineral oil-based components, but also some flammable and volatile oils, which is not conducive to actual production. These mineral oils adhere to the surface of concrete products and are extremely difficult to remove, which affects the subsequent shaving process; the Chinese patent "a concrete release agent" (CN105820862A) uses polyvinyl alcohol, oleic acid, and emulsified oil as release agents. The active ingredients of the mould, and added thickeners, emulsifiers and antifreeze, etc., its disadvantages are: the use of vinyl alcohol, nonylphenol polyoxyethylene ether will also not easily degrade and cause environmental pollution; China The production process described in the patent "A self-emulsifying oil production machine and self-emulsifying ester" (CN106811307) uses normal temperature oxygen as an oxidant, which cannot be selectively oxidized, which is not conducive to the production of self-emulsifying products with stable performance; Chinese patent "a A self-emulsifying ester modified by vegetable oil and its preparation method" (CN105199856A) utilizes unsaturated vegetable oil and alkenyl dibasic acid to carry out Diels-Alder addition reaction, makes vegetable oil have hydrophilic carboxyl group, and then reacts with fatty alcohol polyether Esterification improves the hydrophilicity of vegetable oil, but the process disclosed in this patent requires vegetable oil containing a conjugated diene structure; the Chinese patent "self-emulsifying fat composition" (CN108882721A) uses triglyceride and glycerol Alcohol is subjected to transesterification reaction, this reaction system has many side reactions, and the product contains monoglyceride, diglyceride and triglyceride, which is not conducive to the formation of stable emulsion; Chinese patent "a self-emulsifying vegetable oil / fatty acid aluminum / triethanolamine Composite system high-efficiency release agent" (CN108060003A) uses aluminum trichloride or titanium tetrachloride to modify vegetable oil to generate glycerides with chloride ions and aluminum fatty acids, and use hydrophilic glycerides to achieve self-emulsification and aluminum fatty acids Reality emulsification stability. This method has strict requirements on the water content of raw materials. Since the catalysts used are all chloride salts, the residual chloride ions will seriously affect the life of the steel formwork and the strength of the steel reinforcement in the concrete; Chinese patent "A Method for Synthesizing Epoxy Vegetable Oil Catalyzed by Laccase" (CN105985866A) uses corn stalks to prepare the mediator, then ferments Pleurotus eryngii and white rot fungus to prepare laccase, and uses laccase to oxidize vegetable oil to obtain epoxy vegetable oil , the disadvantage is that the fermentation efficiency is not high

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