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Polymer powder compositions which can be redispersed in water

A technology for redispersing polymers and compositions, which can be used in fertilizer mixtures, soil protection, infrastructure engineering, etc., and can solve problems such as unevenness and separation

Active Publication Date: 2021-04-02
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in the case of powder mixtures of polymeric binders and flocculants, the problem is that there is separation (inhomogeneity) during storage in silos or packaging

Method used

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  • Polymer powder compositions which can be redispersed in water
  • Polymer powder compositions which can be redispersed in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] First 53 g of sodium sulfate were dissolved in 1350 g of water, then 420 g of a 20 wt % aqueous solution of polyvinyl alcohol with a Hoppler viscosity of 4 mPas and a degree of hydrolysis of 88 mol % (Mowiol 4-88 from Kuraray) and 360 g of a Hoppler viscosity of 13 mPas and an 11% by weight aqueous solution of polyvinyl alcohol with a degree of hydrolysis of 88 mol% (Mowiol 13-88 from Kuraray), and the mixture was stirred for 10 minutes.

[0063] 3.6 g of an acrylamide-acrylic acid copolymer powder (Flobond A30 from SNF) having 70% by weight of acrylamide and 30% by weight of acrylic acid were then added to the solution, and the mixture was stirred for 4 hours.

[0064] The result was a clear solution with a viscosity of 61 mPas (Brookfield BF20 at 23° C., spindle 1).

[0065] This solution is mixed with 3 kg of polyvinyl alcohol-stabilized vinyl acetate-ethylene copolymer dispersion (93 wt % vinyl acetate, 7 wt % ethylene, Tg=16° C.) with a solid content of 58 wt %, an...

Embodiment 3

[0075] 29.2kg solid content is 58wt% polyvinyl alcohol stabilized vinyl acetate-ethylene copolymer dispersion (93wt% vinyl acetate, 7wt% ethylene, Tg=16 ℃) with 9.1kg water, 3.6kg hope 20 wt% aqueous polyvinyl alcohol solution (Mowiol 4-88 from Kuraray) with a Lek viscosity of 4 mPas and a degree of hydrolysis of 88 mol % and 2.9 kg of an aqueous 11 wt % polyvinyl alcohol solution with a Hoppler viscosity of 13 mPas and a degree of hydrolysis of 88 mol % (from Kuraray Mowiol 13-88) for blending.

[0076] 112 g of an acrylamide-acrylic acid copolymer 30 wt% aqueous emulsion (Flobond Emulsion L33 from SNF) with 70 wt% acrylamide and 30 wt% acrylic acid were then added and the mixture was stirred for 2 hours. The result was a homogeneous mixture with a viscosity of 250 mPas (Brookfield BF20, SP1, at 23° C.).

[0077] The mixture is then sprayed using a two-fluid nozzle. The atomized components used were pre-air compressed to 4 bar. The formed droplets were simultaneously dried...

Embodiment 5

[0083] The procedure of Inventive Example 3 was repeated, except that instead of 3.6 kg of a 20 wt% aqueous solution of polyvinyl alcohol (Mowiol 4-88 from Kuraray) with a Hoppler viscosity of 4 mPas and a degree of hydrolysis of 88 mol%, an equal amount of 20% by weight aqueous solution of hydrolyzed vinyl acetate-VeoVa10-vinylsulfonate copolymer.

[0084] The blocking stability of the obtained powder was 2.

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Abstract

The invention relates to a polymer powder composition which can be redispersed in water, said composition containing: a) a base polymer of one or more monomers from the group containing vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 15 C atoms, methacrylic acid esters and acrylic acid esters of alcohols having 1 to 15 C atoms, vinyl aromatics, olefins, dienes and vinyl halides; b) one or more flocculation agents from the group containing: b1) acrylamide homopolymers or acrylamide copolymers of one or more monomers from the group containing acrylamide, methacrylamide,acrylic acid, methacrylic acid, acrylonitrile, 2-acrylamido-2-methylpropanesulphonic acid; b2) cationic homopolymers or mixed polymers of one or more cationic monomers with a quaternary ammonium groupfrom the group containing diallyl dimethyl ammonium chloride (DADMAC), diallyl diethyl ammonium chloride (DADEAC), (3-methacryloxy) propyl trimethylammonium chloride (MPTAC), (2-methacryloxy) ethyl trimethylammonium chloride (METAC), (3-methacrylamido) propyl trimethylammonium chloride (MAPTAC); b3) polysaccharides from the group containing starch, starch derivatives, cellulose and cellulose derivatives, the flocculation agents b) each having a Brookfield viscosity of at least 20 mPas in a 1 wt% solution in water at 23 DEG C.

Description

technical field [0001] The present invention relates to a water-redispersible polymer powder composition (dispersible powder composition) for soil stabilization (soil consolidation), a process for producing the dispersible powder composition, and its use for soil stabilization And the use of sand fixation. Background technique [0002] Dust control and soil stabilization are major environmental and health concerns. Sand and dust are generally seen as nothing more than a nuisance; severe dust can also be a safety hazard by, for example, reducing visibility on sandy roads and construction sites. Dust is also a health risk, especially due to the presence of respirable fine dust. In the case of sandy roads, an important economic factor is not only dust suppression, but also longer durability associated with lower maintenance costs. Through soil stabilization, not only wind erosion but also water erosion can be slowed down, thereby reducing the creation of potholes and traffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L31/04C09K17/20E02D3/12C04B24/26C04B24/38C08L29/04C08L33/26
CPCC08K3/346C08K2003/265C08L31/04C08L2205/025C08L2205/035C09K3/22C09K17/22C04B28/04C04B2111/00732C04B2103/0057C04B40/0042C04B2111/00672C04B2111/00663C04B2111/72C04B2103/0075C08L29/04C08L33/26C04B24/2641C04B24/2652C04B24/163C04B24/2682C04B24/38C04B24/383C04B24/2623C04B26/04C04B28/02C04B2103/008C04B2103/60C04B2111/00637C09K17/44
Inventor 阿卜杜尔马杰德·哈什姆扎德
Owner WACKER CHEM GMBH
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