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Modified redispersible emulsion powder

A redispersed latex powder and modification technology, applied in the field of additives in the construction field, can solve the problems of low water resistance strength, influence of water resistance bonding performance, etc., and achieve the effect of good water resistance strength, good bonding strength, and increased water resistance strength.

Active Publication Date: 2016-07-06
广东龙湖科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the redispersible latex powder widely used in the market mainly includes EVA (ethylene-vinyl acetate) rubber powder, acrylic acid rubber powder, and styrene-butadiene rubber powder. , especially for bonding with organic materials, but the water-resistant strength of EVA (ethylene-vinyl acetate) rubber powder or acrylic acid rubber powder is low, so in a humid environment, its water-resistant bonding performance will be greatly affected

Method used

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  • Modified redispersible emulsion powder
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  • Modified redispersible emulsion powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Formula (weight ratio) of modified redispersible latex powder:

[0019] EVA latex powder 50%

[0020] Tributyl citrate 20%

[0021] Silane coupling agent 0.5%

[0022] Titanate coupling agent 1.0%

[0023] Diatomaceous earth (720 mesh) 28%

[0024] Sodium hexametaphosphate 0.5%

[0025] 2. Preparation

[0026] (1) According to the above formula, pour the silane coupling agent and titanate coupling agent into the tributyl citrate solution, stir at 100 rpm for 5 minutes, then add sodium hexametaphosphate into the above solution, Continue to stir for 5 minutes;

[0027] (2) Add EVA latex powder to the mixture in step (1), and stir at 650 rpm for 10 minutes;

[0028] (3) Add diatomaceous earth into a horizontal mixer, stir slowly at 45 rpm, and use high-pressure spray equipment (pressure 0.3MPa) to evenly spray the mixture in step (2) into the mixer, and stir for 15 minutes to obtain Modified redispersible latex powder.

[0029] 3. Application and performance te...

Embodiment 2

[0041] 1. Formula (weight ratio) of modified redispersible latex powder:

[0042] Acrylic powder 40%

[0043] Epoxidized soybean oil 30%

[0044] Silane coupling agent 0.6%

[0045] Titanate coupling agent 1.2%

[0046] Fumed silica (220 mesh) 12.6%

[0047] Diatomaceous earth (750 mesh) 15%

[0048] Polyacrylic acid sodium salt 0.6%

[0049] 2. Preparation

[0050] (1) According to the above formula, pour the silane coupling agent and titanate coupling agent into the epoxy soybean oil solution, stir at 200 rpm for 5 minutes, and then add glyceryl tristearate into the above solution , continue to stir for 5 minutes;

[0051] (2) Add acrylic rubber powder to the mixture in step (1), and stir for 10 minutes at 850 rpm;

[0052] (3) Add fumed silica and metakaolin to a horizontal mixer, stir slowly at 60 rpm, and use high-pressure spray equipment (pressure 0.4MPa) to evenly spray the mixture in step (2) into the mixer, Stir for 15 minutes to obtain modified redispersible...

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Abstract

The invention provides a modified redispersible emulsion powder. The modified redispersible emulsion powder is made by adding 1.5-2 parts of a coupling agent into 20-35 parts of a plasticizer, stirring at 100-200 r / min for 5-8 min, adding 0.3-1 part of a dispersant, and continuing stirring for 5-10 min; adding 35-55 parts of redispersible emulsion powder into a mixed solution, and stirring at 500-1000 r / min for 10-15 min; finally, adding 7-43.2 parts of an adsorbent into a horizontal stirrer, stirring slowly at 30-80 r / min, spraying a mixture evenly with a high-pressure spraying apparatus under 0.3-0.5 MPa into the stirrer, and stirring for 15-20 min to obtain the modified redispersible emulsion powder. The plasticizer is one or any of an epoxy ester plasticizer, a glycerol triacetate plasticizer, a polyol ester plasticizer, and a citrate plasticizer, and the coupling agent is a titanate coupling agent and / or a silane coupling agent. The modified redispersible emulsion powder can replace EVA (ethylene-vinyl acetate copolymer) powder and acrylic acid powder presently widely applicable in ceramic tiles and EPS\XPS plate adhesive mortar, can also be used with these powders and has the advantages of low addition, high adhesive strength and good water tolerance.

Description

technical field [0001] The present invention relates to an additive in the field of construction, in particular to a redispersible latex powder used in dry powder mortar, and more specifically to a modified powder that can better improve the bonding performance of dry powder mortar and various substrates. Modified redispersible latex powder. Background technique [0002] Redispersible latex powder is a polymer powder obtained from water-based polymer emulsion through spray drying technology. After contacting and dissolving with water, it can be quickly dispersed and restored to the emulsion state, and has properties equivalent to the original emulsion. Redispersible latex powder is an essential polymer additive in dry powder mortar, and dry powder mortar is a new type of building material widely used in the construction field, and can be applied to the bonding field of various construction mortars. Adding a certain amount of redispersible latex powder to the dry powder mort...

Claims

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Application Information

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IPC IPC(8): C04B24/42
CPCC04B40/0042C04B2103/0057C04B24/2623C04B24/06C04B24/42C04B24/40C04B14/08C04B22/16C04B24/2641C04B24/08C04B14/04C04B24/26
Inventor 李英丁洪永顺
Owner 广东龙湖科技股份有限公司
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