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Waterproof cement additive and cement containing same

An additive and cement technology, which is applied in the field of cement, can solve the problems of inconvenient storage and transportation of liquid resin, difficult construction operation, non-corrosion and anti-mildew, etc., and achieve the effect of strong compactness, strong price advantage, and reduced microcracks

Inactive Publication Date: 2013-09-11
天津市南开区房地产管理局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. Liquid resin also has many problems such as storage and transportation inconvenience
For example, in weak links such as pipelines, floor drains, and toilet pits, sealing materials are not used for caulking, or suitable materials are not used to match the construction technology, and non-corrosion and mildew-proof materials are used, which can easily cause leakage.
For a long time, asphalt, linoleum and organic materials have been the main waterproof materials. Some materials are poisonous and odorous, difficult to operate and not resistant to aging.
For this reason, several kinds of rigid waterproof coatings have been introduced successively in China, but the cost is relatively high.

Method used

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  • Waterproof cement additive and cement containing same
  • Waterproof cement additive and cement containing same
  • Waterproof cement additive and cement containing same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] Example 1, a cement waterproof additive, the preparation method is as follows:

[0044] Dissolve 9.4g of polyvinyl alcohol into 120mL of distilled water, add 5.8mL of methyl acrylate to the solution, and 0.4g of ammonium cerium sulfate as an initiator, place the system in a water bath and pass nitrogen into the system for half an hour, and put the water bath Adjust the temperature of the pot to 70°C, and react for 8 hours to obtain a cement waterproof additive, which is a graft copolymer emulsion.

example 2

[0045] Example 2, a cement waterproof additive, the preparation method is as follows:

[0046] The steps are the same as in Example 1, except that the ratio of polyvinyl alcohol: methyl acrylate is g:ml=2:1-1.7, and the weight ratio of polyvinyl alcohol:initiator is: 20-25:1. The initiator is ammonium cerium sulfate

example 3

[0047] Example 3, a cement waterproof additive, the preparation method is as follows:

[0048] The steps are the same as in Example 1, except that the ratio of polyvinyl alcohol: methyl acrylate is g: ml=1.62, and the weight ratio of polyvinyl alcohol: initiator is 23.5.

[0049] The reaction formula is as follows:

[0050]

[0051]

[0052] Using the synthetic route shown in the figure above, polyvinyl alcohol and methyl acrylate are used for free radical polymerization under the catalysis of cerium sulfate to produce polyvinyl alcohol polymethyl acrylate copolymer and polymethyl acrylate homopolymer. figure 1 It is the emulsion of the polymer obtained after the reaction.

[0053] From figure 2 It can be seen that in the infrared spectrum of gPVA, the stretching vibration peak of the hydroxyl group is weakened at 3249cm-1, the hydrocarbon stretching vibration peak of the methyl group appears at 2930cm-1, and the ester appears at 1242cm-1. The stretching vibration pe...

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Abstract

The invention relates to a waterproof cement additive and cement containing the same. The waterproof cement additive is prepared through the following steps: dissolving polyvinyl alcohol in water, adding methyl acrylate in the solution, then adding an initiator, carrying out water bath at 60 to 90 DEG C, introducing nitrogen, and reacting for 2 to 10 hours, wherein the ratio of polyvinyl alcohol to methyl acrylate is 2g:(1 to 2) ml, and the weight ratio of polyvinyl alcohol to the initiator is (15 to 30):1. After the waterproof cement additive is blended with emulsion formed after cement is dissolved, cement has excellent continuous film forming performance, so that active groups in polymer molecules are possibly in the cross-linking reaction with Ca and Al in hydration products of cement to form a special bridge bonding effect, the physical organizational structure of hard cement mortar is improved, the internal stress is relieved, the generation of the microcracks is reduced, the compactness of waterproof polymer paint is enhanced, and the compactness is stronger.

Description

technical field [0001] The invention belongs to the field of cement and relates to a waterproof additive, in particular to a cement waterproof additive and cement containing the additive. technical background [0002] The polymers used to prepare polymer cement waterproof concrete can be divided into three types, namely polymer emulsions, water-soluble polymers, and liquid resins. At present, the most commonly used and the best modification effect is polymer emulsion. [0003] 1. The main components of polymer emulsion are polymer particles (size 0.1-1μm), emulsifier, stabilizer, dispersant, etc., and its solid phase content is between 40% and 70%. The polymer particles are uniformly dispersed in the aqueous solution through the action of the emulsifier to form an emulsion, and under the action of the dispersant and the stabilizer, the emulsion can be kept for a long time without segregation and flocculation. In addition, in order to prevent the air bubbles brought in by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/10C04B24/26C04B103/65
Inventor 阎红年荆宝泽陈鲁明毛占国
Owner 天津市南开区房地产管理局
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