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Aqueous polymer secondary dispersions for manufacturing coatings

A dispersion and secondary water technology, applied in anti-corrosion coatings, polyurea/polyurethane coatings, coatings, etc., can solve problems such as paint surface defects, paint layer bubbles, and reduce the value of paint components

Inactive Publication Date: 2009-01-28
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-component PU water-based paint of the prior art will cause air bubbles in the paint layer, resulting in serious defects on the paint surface, thereby reducing the value of the paint components

Method used

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  • Aqueous polymer secondary dispersions for manufacturing coatings
  • Aqueous polymer secondary dispersions for manufacturing coatings
  • Aqueous polymer secondary dispersions for manufacturing coatings

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Therefore the present invention also provides the preparation method according to the polyacrylate aqueous dispersion of the present invention, it is characterized in that: in the first step (i), by monomer Ia) and Ib) prepare OH value 12-250 mgKOH / g solid hydroxy-functional hydrophobic graft base I); in a second step (ii), the monomers IIa) to IIc) are polymerized in the solution of the graft base I) obtained from step (i), wherein Monomer B) is used in step (i) and / or step (ii), preferably in step (i), and the resulting hydroxyl-functional hydrophilic polymer has an OH value of 20-250 mg KOH / g solid and 50- Acid value of 250 mg KOH / g solid and free radical initiated copolymerization of the mixture of monomers I) and II) in co-solvent C); neutralizer is then added after the preparation of the copolymer to prepare the dispersion desired ionic groups; followed by a dispersion step obtained by adding water to the copolymer or by transferring the copolymer to a volume of ...

Embodiment

[0065] raw material

[0066] I) Monomer

[0067] acrylic acid

[0068] n-butyl acrylate

[0069] n-Butyl methacrylate

[0070] 2-Ethylhexyl methacrylate

[0071] 2-Hydroxyethyl methacrylate

[0072] Methyl methacrylate

[0073] Methacrylate:

[0074]

[0075] Methacrylate 13.0 "AM009": n=1 2, synthetic lauryl methacrylate (CASNo.90551-76-1, GmbH & Co. KG, Darmstadt)

[0076] Methacrylate 17.4 "AM010": n=16.4 (CAS No.90551-84-1, GmbH & Co. KG, Darmstadt)

[0077] Stearyl methacrylate: n=17 (CAS No.32360-05-7)

[0078] II) Initiator

[0079] Di-tert-butyl peroxide

[0080] III) Solvent

[0081] : Acetate - (3-methoxy n-butyl) ester (Celanese Chemicals EuropeGmbH,) Germany

[0082] 100: Aromatics, initial boiling point (ASTM D86-05) 162°C, Exxon-Chemie, Esso Deutschland GmbH

[0083] IV) Others

[0084] VP AI 3468: Flow Control Agents, Lanxess AG, Leverkusen, DE

[0085] VP LS 2319: Hydrophilicized aliphatic polyisocyanate based on hexamethylene di...

Embodiment 2

[0099] Example 2 (according to the invention, 15% methacrylate 17.4)

[0100] 158.3 g butyl glycol and 220.6 g 100 was placed in a 6 liter reaction vessel equipped with a stirrer, cooling device and heating device and heated to 138°C. At this temperature, a mixture consisting of 8 g of butyl glycol and 8 g of di-tert-butyl peroxide was added dropwise over 30 minutes. Then within 5 hours, a mixture consisting of 34.3 g butyl glycol and 34.3 g di-tert-butyl peroxide, and 680.0 g methyl methacrylate, 445.0 g 2-hydroxyethyl methacrylate, 482.2 A mixture of g n-butyl acrylate and 375.0 g methacrylate 17.4. Immediately thereafter, a mixture consisting of 8.0 g butyl glycol and 20.0 g di-tert-butyl peroxide, and a mixture consisting of 127.5 g methyl methacrylate, 180.0 g 2-hydroxyethyl methacrylate, 100.0 g n-butyl acrylate ester and 60 g of acrylic acid. The mixture was then stirred at 138° C. for 1 hour, then cooled to 100° C. and 77.9 g of N,N-dimethylethanolamine were added...

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Abstract

The invention relates to a secondary polymer water diffuser for preparing dope, namely, secondary polymer water diffuser based on special acrylic ester structure unit, preparation method thereof and function as bond in producing non-frothing dope.

Description

[0001] Related Application Cross Reference [0002] This application claims priority under 35 U.S.C. §119 from German Patent Application No. 10 2007 035366.0 filed July 27, 2007, which is incorporated herein by reference in its entirety for all available purposes. technical field [0003] The present invention relates to a secondary aqueous dispersion of a polymer based on a special acrylate structural unit, a process for its preparation, and its use as an adhesive in the manufacture of non-foaming coatings. Background technique [0004] The use of polyacrylate-based dispersions in water-reducible paint and coating systems is known from numerous publications and patents. [0005] When any paint is applied to a substrate, air, either in dissolved form or in the form of microbubbles, is trapped in the paint film. As the lacquer dries and the solvent and / or water evaporates, air bubbles form or existing tiny air bubbles grow. Some of these bubbles redissolve in the paint pol...

Claims

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Application Information

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IPC IPC(8): C08L33/06C08J3/03C09D133/06C09D5/12C09D175/04
CPCC08F263/02C09D4/00C08F265/00C09D151/003C08F263/00C08F257/02C08F265/04C08L51/003C08L2666/02C08J3/07C08L51/00C09D151/00C08F265/06
Inventor T·穆恩兹梅M·梅尔乔尔斯S·哈克巴思H·-D·格韦斯
Owner BAYER MATERIALSCIENCE AG
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