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Crosslinkable powder composition which is redispersible in water

A redispersion and composition technology, applied in powder coatings, coatings, adhesives, etc., can solve problems such as shortened shelf life and premature crosslinking

Inactive Publication Date: 2003-05-28
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has the disadvantage that these mixtures have the same odor as the pure crosslinker component if diluted to some extent
In addition, due to the weak physical bond, the crosslinker component may come out and penetrate into the polymer to be crosslinked, especially if the polymer is a very reactive substance, which will lead to Reduced shelf life or premature crosslinking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add 3420 grams of water in a stirring autoclave with a volume of 16 liters, 352 grams of polyvinyl alcohol with a Hoppler viscosity of 4 mPas (mPas) (at 20° C., a 4% concentration in water) and a saponification value of 140, 50 grams Dodecylbenzenesulfonate (concentration in water is 15%), 510 grams of vinyl acetate and 200 grams of ethylene, and the mixture is heated to 50°C. A catalyst solution consisting of a 6% strength aqueous solution of sodium persulfate and a 3% strength aqueous solution of sodium formaldehyde sulfoxylate was then added. After the polymerization had started, a monomer stream containing 2800 grams of vinyl acetate and 120 grams of glycidyl methacrylate was fed. During the course of the polymerization, an additional 800 grams of ethylene was added. After a metered reaction time of about 5 hours, the polymerization was continued for 2 hours.

[0055] The resulting dispersion had a solids content of 51%. The K value of the polymer was 74.5, the g...

Embodiment 2

[0058] Add 2000 grams of water in a stirring autoclave with a volume of 16 liters, 487 grams of Hoppler viscosity is 4 mPas (at 20 DEG C, 4% concentration of aqueous solution), polyvinyl alcohol with a saponification value of 140, the mixture is heated to 50°C and introduce ethylene to make the pressure reach 60×10 5 Pa (60 bar). This pressure value is maintained over the entire time of monomer metering. A catalyst stream consisting of a 2.6% strength aqueous solution of tert-butyl hydroperoxide and a 4.5% strength aqueous solution of sodium formaldehyde sulfoxylate was added simultaneously with the feed of the monomer stream. The monomer solution consisted of 4563 grams of vinyl chloride, 1950 grams of vinyl acetate and 200 grams of glycidyl acrylate. After the start of the polymerization reaction, 667 g of a polymer having a Hoppler viscosity of 4 mPas (milliPascal seconds) (4% concentration in water at 20° C.) and a saponification number of 140 dissolved in 3937 water was...

Embodiment 3

[0061] This example was carried out according to the same polymerization method and spray drying method as in Example 1, except that 120 grams of allyl acetoacetate was used instead of 120 grams of glycidyl methacrylate. The resulting dispersion had a solids content of 50.3%. The K value of the polymer was 82.9, the glass transition temperature Tg was 1°C, and the melt flow temperature (MFT) was 0°C.

[0062] Before spray drying, the polyvinyl alcohol with a viscosity of 13mPas (mPas) (at 20°C, 4% concentration in water) and a saponification value of 140 was added in the form of an 11% aqueous solution with a concentration of 8.1% of the polymer weight. , Dry in the same manner as in Example 1.

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Abstract

A crosslinkable powder composition is provided which is redispersible in water and comprises a) from 30 to 95 parts by weight of one or more water-insoluble, film-forming polymers of free-radically polymerizable, ethylenically unsaturated monomers, where from 0.5 to 10% by weight of the monomers, based on the total weight of the polymer a), are ones having one or more substituents selected from the group consisting of aldehyde, keto, epoxide, isocyanate, carboxylic anhydride and aziridine groups, b) from 5 to 70 parts by weight of one or more water-soluble, film-forming polymers, where the parts by weight of a) and b) add up to 100 parts by weight, and c) one or more compounds containing at least two functional groups which are present in salt form and are selected from the group consisting of amines, hydrazides, hydroxylamine esters, aryl- and alkylhydrazines or -hydrazones.

Description

technical field [0001] The present invention relates to a redispersible crosslinkable powder composition in water and its use. Background technique [0002] European patent EP-A601518 reports a crosslinkable dispersible powder based on carboxyl-containing acrylate copolymers that can be redispersed in water, wherein the copolymers are dried in the presence of polyvinyl alcohol and may contain polyvalent metals Ions are used for crosslinking. Similar crosslinkable dispersible powders are also reported in U.S. Patent US-A3409578, wherein powder compositions containing carboxyl-bearing polymers and / or carboxyl-bearing protective colloids are crosslinked in the presence of polyvalent metal ions . A disadvantage of such compositions containing polyvalent metal salts is the evolution of acid in the presence of water, which causes premature crosslinking, especially on contact with moisture. [0003] In order to avoid premature crosslinking, European Patent ...

Claims

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Application Information

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IPC IPC(8): C08L101/12C04B40/00C08K5/16C08L57/04C09D201/00C09J201/00
CPCC08K5/16C04B40/0042C04B2103/0057C04B24/12C04B24/26C04B28/02C08L57/00C08L101/00C08K5/22C08L57/04
Inventor 彼得·鲍尔赫伯特·埃克
Owner WACKER CHEM GMBH
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