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Improved microcapsules, and production thereof

A technology of microcapsules and capsule walls, which is applied in the field of improved microcapsules and its preparation, and can solve the problems that the formaldehyde content cannot be reduced to a low level

Inactive Publication Date: 2012-05-02
福尔曼化工原料及工艺技术有限公司及两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of large amounts of formaldehyde scavengers also generally does not reduce the formaldehyde content of products comprising or treated with said microcapsule dispersions below a certain limit

Method used

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  • Improved microcapsules, and production thereof
  • Improved microcapsules, and production thereof
  • Improved microcapsules, and production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] Embodiment 1: the preparation of copolymer

[0197] a) AMPS-hydroxybutyl acrylate

[0198] For a 1500 g charge, 891 g demineralized water was charged with 585 g AMPS (50% in water) and 7.5 g 4-hydroxybutyl acrylate (HBA) into the reactor and placed under a protective gas atmosphere. The reaction mixture was heated to 75°C with stirring (400 rpm). When the reaction temperature was reached, 0.03 g of the water-soluble initiator sodium peroxodisulfate was dissolved in 15 g of water and sprayed into the reactor via a syringe. The supplementary reaction was started one hour after reaching the maximum temperature. The charge was then cooled to room temperature and 1.5 g of preservative was added.

[0199] The aqueous solutions were characterized by viscosity, solids content and pH. The viscosity was 540 mPas (measured at 20 rpm Brookfield), the solids content was 21% and the pH was 3.3. 3 g of copolymer were placed on a Petri dish and dried in a drying oven at 160° C. fo...

Embodiment 2

[0203] Embodiment 2: resorcinol capsule

[0204] In a 400ml beaker, under stirring (stirring speed: about 1500U / min), 5.5g of resorcinol was dissolved in 70g of water, followed by adding 2.0g of sodium carbonate solution (20% by weight), and the pH value was about 7.9 at this time . The solution was heated to a temperature of about 52°C. Then 25.5 g of glutaraldehyde were added.

[0205] Stirring of the mixture was continued for about 10 minutes at a stirring speed of about 1500 U / min and a temperature of about 52° C. (precondensation time). Then add about 20 g of water, after about 2 minutes add 1 g of protective colloid a) copolymer 1a, b) copolymer 1b and c) poly-AMPS (AMPS-homopolymer), after about 2 minutes Add 55 g of Palatinol A diethyl phthalate. Immediately thereafter, the stirring speed was increased to about 4000 U / min and 20.0 g of sodium carbonate solution (20% by weight) were added in about the same time. The pH of the mixture was then brought to about 9.7. ...

Embodiment 3

[0211] Embodiment 3: the preparation of solid ball

[0212] A solution of 4.5 g phloroglucinol, 200 g water and 32.2 g glutaraldehyde-solution (50%) was stirred slowly at room temperature for 90 minutes.

[0213] The temperature was then maintained at 40°C for 2 hours.

[0214] During this time particles were formed, which in this case grew up to a size of 4 μm and had a very narrow size distribution.

[0215] The particles were subsequently cured at 60°C for 2 hours. The finished slurry has a pH of 3.4.

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Abstract

The invention relates to microcapsules, the walls of which comprise a resin that can be obtained by reacting at least one aromatic alcohol or the ether or derivative thereof with at least one aldehyde component containing at least two C atoms per molecule.

Description

technical field [0001] The invention relates to microcapsules whose capsule walls comprise a resin obtained by the reaction of at least one aromatic alcohol and at least one aldehyde component having at least two C atoms per molecule, and dispersions comprising said microcapsules. Furthermore, the subject of the present invention is the use and preparation of said microcapsules / microcapsule dispersions as well as products comprising such microcapsules / microcapsule dispersions and their use. Another subject of the present invention are novel AMPS-copolymers suitable for use as protective colloids, eg in the production of microcapsules. Background technique [0002] Microcapsules which may contain liquid, solid or gaseous substances as core material are known from the prior art. Materials for the capsule wall are generally, for example, phenol-formaldehyde polymers, melamine-formaldehyde polymers, urethanes, gelatin, polyamides or polyureas. Carbon paper is commonly prepared...

Claims

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Application Information

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IPC IPC(8): B01J13/14B01J13/20
CPCB01J13/206B01J13/14Y10T428/2982C08F20/10
Inventor K·拉斯特D·米斯
Owner 福尔曼化工原料及工艺技术有限公司及两合公司