A kind of waterproofing agent for building gypsum and preparation method thereof

A technology for building gypsum and waterproofing agent, which is applied in the field of preparation of waterproofing agent for building materials, can solve the problems of reduced waterproof performance, large mixing amount, weak base material binding ability, etc., and achieves enhanced waterproofing effect, improved softening coefficient, and good air permeability. effect of effect

Active Publication Date: 2016-09-28
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 building gypsum waterproofing agents such as paraffin wax emulsion and styrene-acrylic emulsion can improve the waterproof performance of gypsum, the large amount added during use will have an adverse effect on the strength of gypsum, while silicone building waterproofing agents have a negative impact on the strength of gypsum. The influence of the strength of gypsum is small, but the relatively cheap methyl silicon alkoxide in the silicone-based waterproofing agent is largely soluble in water, and its binding ability with the substrate is not strong, so it is easy to lose with the large amount of water in the production process of gypsum products. And then cause its decline in improving the waterproof performance of gypsum
Therefore, the existing waterproofing agent for building gypsum has the defects of large amount of admixture during use, great influence on gypsum strength, and poor waterproof performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of a waterproofing agent for building gypsum, using methyl methacrylate, butyl acrylate and acrylic acid as raw materials, and using vinyl triethoxysilane as a coupling agent, comprising the following specific steps:

[0022] (1) Dissolve 0.4 part of emulsifier sodium hydroxycarboxylate (AEC-7Na) in 90 parts of deionized water by weight, add 15 parts of methyl methacrylate, 10 parts of butyl acrylate and 4 parts of acrylic acid respectively, stir For emulsification, the stirring speed is 2000r / min, the stirring time is 0.4h, and the pH is adjusted to 8 with sodium hydroxide; (2) In the step (1) system, 0.2 part by weight of ammonium persulfate is added, while stirring The temperature was raised to 80° C., and the mixture was kept warm and stirred for 1 h. In this step, it is best when the heating rate is 10°C / min and the stirring speed is 2500r / min; (3) the system in step (2) is cooled to 55°C, and then 8 parts by weight of vinyltriethoxysilane are ...

Embodiment 2

[0024] A preparation method of a waterproofing agent for building gypsum, using methyl methacrylate, butyl acrylate and acrylic acid as raw materials, and using vinyl triethoxysilane as a coupling agent, comprising the following specific steps:

[0025] (1) Dissolve 2 parts of emulsifier sodium hydroxycarboxylate (AEC-7Na) in 100 parts of deionized water by weight, add 20 parts of methyl methacrylate, 15 parts of butyl acrylate and 8 parts of acrylic acid, stir and emulsify , it is best to stir at a speed of 2000r / min for 1h, and adjust the pH to 10 with a strong base; (2) in the step (1) system, add 0.8 parts of ammonium persulfate by weight, heat up to 80 ° C while stirring, keep the temperature and stirring for 1.6h; (3) cooling the system in the step (2) to 55°C, preferably by natural cooling, when the temperature reaches 55°C, add 12 parts by weight of vinyltriethoxysilane, keep the temperature and keep it cool. Stir for 1.1h; (4) To the step (3) system, add 55 parts by w...

Embodiment 3

[0027] A preparation method of a waterproofing agent for building gypsum, using methyl methacrylate, butyl acrylate and acrylic acid as raw materials, and using vinyl triethoxysilane as a coupling agent, comprising the following specific steps:

[0028] (1) Dissolve 1.2 parts of emulsifier sodium hydroxycarboxylate (AEC-7Na) in 95 parts of deionized water by weight, add 17.5 parts of methyl methacrylate, 12.5 parts of butyl acrylate and 6 parts of acrylic acid, stir and emulsify , and adjust the pH to 9 with a strong base; (2) in the system of step (1), add 0.5 part of ammonium persulfate by weight, heat up to 80°C while stirring, keep warm and stir for 1.3h; (3) add step ( 2) Cool the system to 55°C, stir during cooling, and 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, and the stirring speed is 2000r (4) In the system of step (3), add 50 parts by weight of sodium methylsilicon...

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PUM

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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 a waterproofing agent for building materials, and particularly relates to a waterproofing agent for building gypsum and a preparation method thereof. Background technique [0002] Gypsum is a rich resource. Gypsum products have good fireproof and sound insulation properties, and have good thermal insulation and humidity control. They are widely used in the construction industry. 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 strength reduction and easy warping deformation of gypsum products after being exposed to moisture, the following three measures are usually adopted: one is to coat or impregnate the surface of the block with a hydrophobic substance or to apply a waterproof coating; The gypsum is mixed with ground slag or pozzolanic material to improve the so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B24/04
Inventor 丁益方有春任启芳
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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