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Method for preparing solid-phase-method barium titanate through gluing

A technology of barium titanate and barium carbonate, which is applied in the field of preparing barium titanate by adding glue, can solve the problems of serious agglomeration of barium titanate and uneven Ba/Ti ratio, so as to ensure dispersion and uniformity, Uniform particles to avoid uneven dispersion

Active Publication Date: 2019-05-24
HUBEI TIANCI ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to prepare solid-phase barium titanate by adding glue to solve the problems of serious agglomeration and uneven Ba / Ti ratio in the process of preparing barium titanate by the existing solid-phase method

Method used

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  • Method for preparing solid-phase-method barium titanate through gluing
  • Method for preparing solid-phase-method barium titanate through gluing
  • Method for preparing solid-phase-method barium titanate through gluing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0024] Add 250g of polyvinyl alcohol pva1788 and vinyl acetate mixture (the ratio of polyvinyl alcohol pva1788 to vinyl acetate is 2:1) into 5kg of water, dissolve at 60-70°C, and filter through a sieve to make glue. Then weigh 5.56 g of glue and 0.28 g of polyacrylamide and polyethylene glycol mixed dispersant, add it to 272.18 g of pure water (the ratio of polyacrylamide and polyethylene glycol is 3:1), and stir to dissolve. Then add 80.05g of titanium dioxide and 197.34g of barium carbonate (Ba / Ti=1, the ignition loss of titanium dioxide and barium carbonate are 0.28% and 0.32% respectively), after stirring, circulate and grind for 60 minutes through a sand mill, and then use a 120°C oven Drying, when the moisture content is less than 0.5%, manually pass through a 40-mesh sieve for calcination, at a temperature of 1000-1100°C, and keep warm for 2-3 hours. The test results are shown in Table 1:

[0025]

[0026] It can be seen from Table 1 that as the calcination tempera...

Embodiment 10-16

[0028] Under the method of Examples 1-9, the experiment of dispersant ratio was carried out. Ba / Ti=0.995, the solid-to-liquid ratio is 1, the total mass ratio of polyvinyl alcohol pva1788 and vinyl acetate to titanium dioxide and barium carbonate is 2‰, stir and sand for 60 minutes, dry in an oven at 120°C, and manually when the moisture content is less than 0.5% Pass through a 40-mesh sieve for calcination, for 2 hours, at a temperature of 1000°C, and keep warm for 2 hours. The test results are shown in Table 2:

[0029]

[0030] It can be seen from Table 2 that the ratio of dispersant has a significant impact on the particle size of the crystal grains, and the particle size is the smallest when the ratio of polyacrylamide to polyethylene glycol is 3:1.

Embodiment 17-25

[0032] Under the method of Examples 1-9, the dispersant content was fixed at 1.5‰, Ba / Ti=0.995, the solid-liquid ratio was 1, and the ratios of pva1788 and vinyl acetate were different. Stir and sand mill for 60 minutes, dry in an oven at 120°C, manually pass through a 40-mesh screen for calcination when the moisture content is less than 0.5%, and heat at 1000°C for 2 hours. The test results are shown in Table 3:

[0033] It can be seen from Table 3 that when the content of dispersant is 1.5‰ of the total mass of titanium dioxide and barium carbonate, and the ratio of pva1788 and vinyl acetate is 2:1, the grain size of barium titanate is the smallest.

[0034]

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Abstract

A solid phase method is a common barium titanate preparation method but has the problem of nonuniform sintering and dispersing. Many researches put forward adopting of drying technology like microwaveand spraying, so that powder calcining and dispersing performance is improved. Compared with steam oven drying technology, microwave or spraying technology is high in cost, and the problem of high-temperature calcining aggregation cannot be solved. Ground powder of titanium dioxide and barium titanate is cured through gluing, and drying and calcining are performed, so that uniformity of barium titanate in the process of calcining and forming is ensured, the problems of drying segregation and high-temperature aggregation of existing ovens are avoided, and Ba / Ti ratio nonuniformity and poor dispersity of a barium titanate product are improved.

Description

technical field [0001] The invention belongs to the field of electronic materials and relates to a method for preparing barium titanate by adding glue in a solid phase method. Background technique [0002] As an important electronic basic material, barium titanate is widely used in current limiting protection, degaussing, starting, heating elements, multilayer capacitor elements, piezoelectric elements, light emitting elements and other fields. As electronic materials continue to become more intelligent and reliable , miniaturization direction, in order to achieve this development will greatly increase the demand for electronic components, and the demand for barium titanate as the basis of electronic materials will increase greatly, and its application will also be broader [0003] At present, the barium titanate market mainly adopts solid-phase method, hydrothermal method, and oxalic acid method. Among them, the solid-phase method has become the mainstream technology becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00
Inventor 资美勇万亚锋吴浩
Owner HUBEI TIANCI ELECTRONICS MATERIALS CO LTD
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