Method for preparing composite microsphere of polymer-nano magnesium hydroxide

A technology of nano-magnesium hydroxide and composite microspheres, which is applied in the field of preparation of inorganic flame retardant magnesium hydroxide, can solve the problems of increasing the difficulty of polymer processing, deterioration of impact strength, surface blooming, etc., and achieves inhibition of secondary agglutination, Improved compatibility and stable quality

Inactive Publication Date: 2004-08-11
ZHEJIANG UNIV
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ordinary magnesium hydroxide is mostly hexagonal crystal or amorphous crystal, with many hydroxyl (-OH) groups on the surface, strong agglomeration between crystal grains, and poor dispersion in resin, so it is difficult to mix with magnesium hydroxide. material compatibility
In order to make magnesium hydroxide qualified as a flame retardant, one method is to carry out hydrothermal treatment to make it a fibrous needle-like crystal to reduce its specific surface area, but after this treatment, its addition usually exceeds 50%. Above, the material can meet certain flame retardant requirements, and other properties of the material (such as impact strength) will deteriorate, which increases the processing difficulty of the polymer. Obviously, this traditional method to endow the material with flame retardancy is to sacrifice or reduce At the expense of some valuable properties of the material; another method is to carry out ultra-fine processing of magnesium hydroxide, that is, in the preparation process of magnesium hydroxide, nanometer (at least one dimension is less than 100nm) particles are made by special technology, Since the performance of the flame retardant effect is dominated by chemical reactions, the smaller the particle size of the same amount of flame retardant, the larger the specific surface area, and the better the flame retardant effect, but only for ultra-fine, magnesium hydroxide There will still be some problems during use. Secondary agglomeration is a common phenomenon of ultrafine particles. The agglomerated ultrafine particles will form agglomerates, and the internal particles are arranged in the closest packing way, and there are gaps between the particles. Stress concentration bodies will be formed after the surface is further wrapped by polymers. Therefore, in the process of material processing, strong stirring, mixing, kneading or rolling are required to destroy and prevent the generation of agglomerates
In addition, using surfactants or coupling agents to modify the surface of magnesium hydroxide is also a method, but the products made after molding and processing with polymer materials will cause surface blooming when exposed to humid air for a long time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] First, mix 160g of styrene, 30g of butyl acrylate, 15g of divinylbenzene and 1.2g of azobisisobutyronitrile, and set aside; then mix 100g of nanometer (average particle size about 75nm) magnesium hydroxide, Add 0.8g of methyl ammonium bromide and 1000ml of water into a 2000ml four-neck flask equipped with a condenser tube and a constant pressure dropping funnel, pass cooling water, start the stirrer, and when the temperature rises to 70-100°C, start to add the above monomers dropwise The mixed solution is controlled to be added dropwise within 4-6 hours, and the reaction is continued for about 30 minutes, and finally cooled, discharged, and spray-dried to obtain polymer microspheres coated with nano-magnesium hydroxide.

Embodiment 2

[0017] First, mix 150g of methyl methacrylate, 30g of butyl acrylate, 10g of trimethylolpropane triacrylate and 1.5g of benzoyl peroxide, and set aside; Add 100g, 0.5g of sodium lauryl sulfate and 1000ml of water into a 2000ml four-neck flask equipped with a condenser tube and a constant pressure dropping funnel, pass cooling water, start the stirrer, and start adding dropwise when the temperature rises to 60-90°C The above-mentioned monomer mixture is controlled to be added dropwise within 4-6 hours, and the reaction is continued for about 30 minutes, and finally cooled, discharged, and spray-dried to obtain polymer microspheres coated with nano-magnesium hydroxide.

Embodiment 3

[0019] First, mix 60g of vinyl acetate, 20g of ethyl acrylate and 5g of trimethylolpropane triacrylate, and set aside; Add 1g of phenol polyoxyethylene ether, 0.2g of sodium lauryl sulfate and 1000ml of water into a 2000ml four-neck flask equipped with a condenser and a constant pressure dropping funnel, pass cooling water, start the stirrer, and heat up to 50-80°C At this time, start to drop the above-mentioned monomer mixture, control the dropwise addition within 4-6 hours, continue the reaction for about 30 minutes, and finally cool and discharge the material, and after spray drying, the polymer microspheres coated with nano-magnesium hydroxide can be obtained. .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
decomposition temperatureaaaaaaaaaa
Login to view more

Abstract

A process for preparing the composite polymer-nano magnesium hydroxide microspheres includes sphericizing the magnesium hydroxide nanoparticles by use of polymer monomer, cross-linking agent and trigger, and the simulative emulsion polymerizing method and spray drying. Its advantages are high product performance in coated rate, quality, flame retarding, compatibility, etc.

Description

technical field [0001] The invention relates to the preparation technology of inorganic flame retardant magnesium hydroxide, in particular to a preparation method of polymer-nanometer magnesium hydroxide composite microspheres. Background technique [0002] Most of the polymer materials widely used by modern humans are combustible or combustible in the air. Therefore, a considerable part of the fires are caused by direct ignition of polymer materials. What's more serious is that when the polymer material is burned, it will produce toxic, harmful and even corrosive gas and smoke, which will cause the trapped person to suffocate and die. According to statistics, nearly 80% of fatal accidents in fires are caused by this. In view of this, all developed countries in the world attach great importance to the development of flame-retardant polymer materials. [0003] Magnesium hydroxide is an additive inorganic flame retardant with triple functions...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/44C08F12/08C08F18/08C08F20/10C08K3/22
Inventor 王杰宋锡瑾
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap