Long-chain alkyl silicone oil waterproof emulsion and preparation method thereof

Abstract

The invention discloses a long-chain alkyl silicone oil waterproof emulsion and a preparation method thereof. The long-chain alkyl silicone oil waterproof emulsion is prepared from the following components in parts by weight: 37.5 to 62.5 parts of tetramethyl tetrahydrocyclotetrasiloxane, 187.5 to 212.5 parts of octamethyl cyclotetrasiloxane, 5 to 7.5 parts of an emulsifier, 30 to 45 parts of dodecylbenzene sulfonic acid, 750 parts of water and 105 to 277 parts of long-chain olefin. The preparation method comprises the following steps: S1, preparing a mixed solution; S2, dispersing for phase inversion to obtain a pre-emulsified emulsion; S3, heating and stirring to completely dissolve; S4, dropwise adding for reaction; S5, cooling and stirring for emulsion polymerization; S6, performing scatalytic reaction; S7, dropwise adding for reaction; and S8, preserving heat and cooling to obtain the long-chain alkyl silicone oil emulsion. According to the invention, a hydrogen-containing silicone oil emulsion is synthesized in an emulsion polymerization manner and then is subjected to addition with olefin, so that the product has better stability, is not easy to demulsify and has good waterproof effect compared with a product obtained by addition of the hydrogen-containing silicone oil emulsion by a mechanical emulsification method. Compared with a long-chain alkyl silicone oil emulsionobtained through a mechanical emulsification method, the long-chain alkyl silicone oil emulsion is good in stability, good in waterproof effect and high in hydrophobicity.

Description

technical field [0001] The invention relates to the technical field of synthetic silicone emulsions, more specifically, to a preparation method of long-chain alkyl silicone oil waterproof emulsions. Background technique [0002] Long-chain alkyl silicone oil is a type of organosilicon compound in which part of the methyl group in the molecular structure of dimethyl silicone oil is replaced by a long-chain alkyl group. The long-chain alkyl group is a hydrophobic group, so the long-chain alkyl silicone oil can be used as a waterproofing agent , can be used as a waterproof agent for ceramics, paper, leather, cement, gypsum, marble and other materials, especially in concrete, real stone paint, rock wool, and wood waterproofing. [0003] Usually, according to the needs of use, the long-chain alkyl silicone oil needs to be diluted with a solvent for use. Because the solvent will pollute the environment, its application is limited and gradually banned; it can also be emulsified int...

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Problems solved by technology

Among them, the emulsifier accounts for 7.94% to 10.53% of the weight of the total composition. An increase in a large amount of emulsifier will lead to a decrease in water resistance. This technical solution still needs to be further improved in terms of water resistance.

[0004] In order to obtain a better waterproof effect, it is necessary to require as little emulsifier as possible in the long-chain alkyl silicone oil emulsion, but the small amount of emulsifier will cause the emulsion to be unstable, which is a contradictory problem

[0005] The long-chain alkyl silicone oil emulsion can be obtained by emulsion addition, that is, the addition of hydrogen-containing silicone oil emulsion and long-chain olefins, but the hydrogen-containing silicone oil emulsion obtained by the conventional mechanical emulsification method has a larger particle size, and the The stability of the added product is relatively poor. If in order to obtain a more stable emulsion, more emulsifier content is required, and this will easily lead to demulsification failure and lower water resistance.

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