Novel waterproof agent for building gypsum, and preparation method thereof

A technology for building gypsum and waterproofing agent, which is applied in the field of building material waterproofing agent preparation, which can solve the problems of poor bonding ability of substrates, reduced whiteness of blocks, large amount of addition, etc., achieve good air permeability, enhance bonding ability, The effect of increasing the softening factor

Active Publication Date: 2015-08-12
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method is simple and easy to implement. If it can be strictly operated, it can achieve a relatively ideal waterproof effect. However, once the coated surface or local defects appear, the exposed gypsum will be eroded by water or even peeled off when it encounters water, resulting in The waterproof performance is reduced; the second method is that the hydration reaction between the gypsum and the active mixed material produces hydration products such as calcium sulfoaluminate hydrate. Although the water resistance is improved, due to the addition of pozzolanic materials, the block The whiteness of the gypsum block is reduced, affecting its decorative effect, and it is easy to cause cracking of the block in the later stage; the third method can not only maintain the decorative effect of the gypsum block, but also achieve the purpose of waterproofing
[0003] However, although traditional build...

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of a novel waterproofing agent for building gypsum, using methyl methacrylate, butyl acrylate and acrylic acid as raw materials, and vinyltriethoxysilane as a coupling agent, comprising the following specific steps: (1) by weight Dissolve 0.4 part of emulsifier sodium hydroxycarboxylate (AEC-7Na) in 90 parts of deionized water, add 15 parts of methyl methacrylate, 10 parts of butyl acrylate and 4 parts of acrylic acid respectively, stir and emulsify at a stirring speed of 2000r / min, the advisable stirring time is 0.4h, and adjust the pH to 8 with sodium hydroxide; (2) In the step (1) system, add 0.2 parts of ammonium persulfate by weight, and heat up to 80°C while stirring , keep warm and stir for 1h. In this step, it is best when the heating rate is 10°C / min and the stirring speed is 2500r / min; (3) cool down the system in step (2) to 55°C, then add 8 parts by weight of vinyltriethoxysilane , keep warm and stir for 0.5h; (4) Add 45 parts by weight ...

Embodiment 2

[0023] A preparation method of a novel waterproofing agent for building gypsum, using methyl methacrylate, butyl acrylate and acrylic acid as raw materials, and vinyltriethoxysilane as a coupling agent, comprising the following specific steps: (1) by weight Dissolve 2 parts of emulsifier sodium hydroxycarboxylate (AEC-7Na) in 100 parts of deionized water, add 20 parts of methyl methacrylate, 15 parts of butyl acrylate and 8 parts of acrylic acid, stir and emulsify, preferably at 2000r Stir at a speed of 1 hour per minute, and adjust the pH to 10 with a strong base; (2) In the system of step (1), add 0.8 parts of ammonium persulfate by weight, heat up to 80 ° C while stirring, keep warm and stir for 1.6 hours; (3) Cool down the system in step (2) to 55°C, preferably by natural cooling. When the temperature reaches 55°C, add 12 parts by weight of vinyltriethoxysilane, keep warm and stir for 1.1h; ( 4) Add 55 parts by weight of sodium methyl siliconate to the system in step (3) a...

Embodiment 3

[0025] A preparation method of a novel waterproofing agent for building gypsum, using methyl methacrylate, butyl acrylate and acrylic acid as raw materials, and vinyltriethoxysilane as a coupling agent, comprising the following specific steps: (1) by weight Dissolve 1.2 parts of emulsifier sodium hydroxycarboxylate (AEC-7Na) in 95 parts of deionized water, add 17.5 parts of methyl methacrylate, 12.5 parts of butyl acrylate and 6 parts of acrylic acid, stir and emulsify, and adjust with a strong base pH to 9; (2) In the step (1) system, add 0.5 parts of ammonium persulfate by weight, heat up to 80°C while stirring, keep warm and stir for 1.3h; (3) Cool down the step (2) system to 55°C, stir when cooling down, the stirring speed is 2000r / min, when the temperature drops to 55°C, add 10 parts by weight of vinyltriethoxysilane, keep warm and stir for 0.8h, the best stirring speed is 2000r / min (4) To the step (3) system, add 50 parts by weight of sodium methyl siliconate and fully s...

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Abstract

The invention relates to a preparation method of a novel waterproof agent for building gypsum. The method adopts methyl methacrylate, butyl acrylate and acrylic acid as raw materials and vinyltriethoxysilane as a coupling agent, and vinyltriethoxysilane is added to promote the formation of an organosilicon waterproof agent silicone resin network and form a coordination network-shaped film formed by organic molecule adsorption metal ions on a contact surface, so the combination ability with the surface of gypsum is enhanced, and the waterproof performance of the waterproof agent is further enhanced. The waterproof agent for building gypsum prepared in the invention has the advantages of small mixing amount in the use process, no unfavorable influences on the strength of gypsum, substantial improvement of the softening coefficient of gypsum products, reduction of the water absorption rate of gypsum, good waterproof effect and easy storage, and is an ideal novel waterproof agent for building gypsum.

Description

technical field [0001] The invention belongs to the technical field of preparation of waterproofing agents for building materials, and in particular relates to a novel waterproofing agent for building gypsum and a preparation method thereof. Background technique [0002] Gypsum is a kind of abundant resources. Gypsum products have good fireproof and sound insulation properties, and have good thermal insulation and humidity control functions. They are widely used in the construction industry. However, due to the poor waterproofness of gypsum products, the strength after water absorption is high The magnitude is reduced, and its development and use have been greatly restricted in modern times. At present, in order to solve the problems of poor water resistance such as low strength and easy warping and deformation of gypsum products after being exposed to moisture, the following three measures are usually adopted: one is to coat or impregnate hydrophobic substances or paint wat...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/04
Inventor 丁益方有春任启芳
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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