Dry preparation method for large-size boehmite

A large particle size, boehmite technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of electronic substrate qualification rate reduction, synthetic resin foaming, surface unevenness, etc., to achieve broad application, high oil absorption rate, The effect of high whiteness

Inactive Publication Date: 2011-11-23
ANHUI ESTONE MATERIAL TECH CO LTD
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Problems solved by technology

The curing of thermoplastic resins is mostly within the dehydration temperature range of aluminum hydroxide, which leads to foaming in the finished synthetic resin, uneven surface, and lower yield
For example, when thermosetting resin is used for electronic substrates, the temperature of soldering and lead-free soldering reaches 230-260°C, so dehydration of aluminum hydroxide may reduce the yield of electronic substrates

Method used

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Embodiment Construction

[0016] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0017] The preparation method of large particle diameter boehmite comprises the following steps:

[0018] (1) Under the conditions of temperature 120-350°C and pressure ≥ 10kPa, aluminum hydroxide is converted into boehmite until the gibbsite crystal structure of aluminum hydroxide is greater than 16%;

[0019] (2) Grind the boehmite to a particle size of 1 to 4 microns, then disperse the boehmite particles evenly in water, use a wet high-speed stirring method to disperse the boehmite, and apply nano-SiO on the surface 2 Coating treatment, while controlling the pH value of the slurry within the range of 6.8 to 7.2;

[0020] (3) After impurity removal and purification, the product is dried to obtain large particle size boehmite.

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Abstract

The invention discloses a dry preparation method for large-size boehmite. The method comprises the following steps of: at a temperature of 120-350DEG C and under a pressure intensity of more than or equal to 10kPa, converting the gibbsite crystal structure of aluminium hydroxide into boehmite; then grinding the boehmite till the granularity is of 1-4 micrometers, and scattering the boehmite particles into water uniformly by a wet high-speed stirring method, and conducting a nano-SiO2 coating treatment on the surface; and finally performing impurity removing, purification and drying, thus obtaining the product of large-size boehmite. The large-size boehmite prepared by a dry method of the invention has low impurity content, high boehmite conversion rate and controllable crystallization granularity. In addition, employing an inorganic modifier, the method provided in the invention can substantially reduce material oil absorption rate and improve liquidity, thus broadening the application of the method in the field of electronic materials.

Description

Technical field: [0001] The invention relates to a method for preparing a new material, in particular to a method for preparing large-diameter boehmite by a dry method. Background technique: [0002] Boehmite with large particle size is boehmite, also known as boehmite, with a structural formula of AiO(OH) and a molecular formula of Al 2 o 3 ·H 2 O, large particle size boehmite is soluble in acid and alkali. This mineral is formed in acidic medium and mainly produced in sedimentary bauxite. It is characterized by symbiosis with siderite. It can be replaced by diaspore, gibbsite, kaolinite, etc., dehydrated into diaspore and α-corundum, and hydrated into gibbsite. The flammability of synthetic resin meets the requirements of use due to the addition of flame retardants. Among many flame retardants, aluminum hydroxide (Al(OH) 3 ) is the most widely used due to rich structural water, good flame retardant effect, excellent acid and alkali resistance, and low cost. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 蒋玉楠蒋学鑫
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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