Surface modification method of special ground calcium carbonate for silicone adhesive and surface-modified ground calcium carbonate

A heavy calcium carbonate, surface modification technology, applied in chemical instruments and methods, dyed organosilicon compound treatment, fibrous fillers, etc., can solve the problems of irregular particles, poor activation effect, wide distribution of fineness, etc. The effect of improving thixotropy, increasing filling ratio and reducing production cost

Inactive Publication Date: 2017-05-31
广西贺州市科隆粉体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compared with nano calcium carbonate and light calcium carbonate, heavy calcium carbonate powder has defects such as excessively wide fineness distribution and irregular particles, which lead to poor activation effect and high oil absorption value, so the general modification treatment The heavy calcium carbonate can not be well used in silicone rubber filler

Method used

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  • Surface modification method of special ground calcium carbonate for silicone adhesive and surface-modified ground calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Heat 95 parts by weight of heavy calcium carbonate to 80°C in advance, then heat 1 part by weight of stearic acid to 80°C, and then use high-pressure air, and the nozzle is a nozzle with a pressure of 0.5Mpa to spray the heavy calcium carbonate with a particle size > 600 mesh Calcium carbonate surface, in the present embodiment, the particle size distribution of heavy calcium carbonate is 600-800 order scope, carries out high-speed stirring again, and stirring speed is 800r / min, makes modifier can carry out good with heavy calcium carbonate Combine, wrap;

[0027] Step 2: After heating 0.5 parts by weight of the silane coupling agent to 85°C, use high-pressure air to spray it on the surface of heavy calcium carbonate at a temperature of 80°C through a nozzle with a pressure of 0.5Mpa, and then perform high-speed stirring at a stirring speed of 800r / min, so that the modifier can be well combined and wrapped with heavy calcium carbonate;

[0028] Step 3: The pro...

Embodiment 2

[0034] Step 1: Heat 105 parts by weight of heavy calcium carbonate to 90°C in advance, then heat 0.5 parts by weight of stearic acid to 75°C, and then use high-pressure air, and the nozzle is a nozzle with a pressure of 0.7Mpa to spray the heavy calcium carbonate with a particle size > 600 mesh Calcium carbonate surface, in the present embodiment, the particle size distribution of heavy calcium carbonate is the scope of 700-900 order, carries out high-speed stirring again, and stirring speed is 850r / min, makes modifier can carry out good with heavy calcium carbonate Combine, wrap;

[0035] Step 2: After heating 1.5 parts by weight of silane coupling agent to 90°C, use high-pressure air to spray it on the surface of heavy calcium carbonate at a temperature of 90°C through a nozzle with a pressure of 0.5Mpa, and then perform high-speed stirring at a stirring speed of 850r / min, so that the modifier can be well combined and wrapped with heavy calcium carbonate;

[0036] Step 3: ...

Embodiment 3

[0038] Step 1: Heat 100 parts by weight of heavy calcium carbonate to 85°C in advance, then heat 0.1 part by weight of stearic acid to 78°C, then use high-pressure air, and spray the nozzle with a pressure of 0.8 on the heavy carbonic acid with a particle size > 600 mesh Calcium surface, in this embodiment, the particle size distribution of heavy calcium carbonate is in the range of 700-1000 mesh, then high-speed stirring is carried out, and the stirring speed is 900r / min, so that the modifier can be well combined with heavy calcium carbonate ,pack;

[0039] Step 2: After heating 1 weight part of silane coupling agent to 88°C, use high-pressure air to spray it on the surface of heavy calcium carbonate at a temperature of 85°C through a nozzle with a pressure of 0.8Mpa, and then perform high-speed stirring at a stirring speed of 900r / min, so that the modifier can be well combined and wrapped with heavy calcium carbonate;

[0040] Step 3: The product obtained in step 2 is drie...

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Abstract

The invention belongs to the field of research on a surface modification method of calcium carbonate, and aims at solving the problem that common modified ground calcium carbonate cannot be well applied to a silicone adhesive packing. The surface modification method of the special ground calcium carbonate for the silicone adhesive comprises the following steps of (1) heating stearic acid, and mixing the stearic acid with the ground calcium carbonate for surface modification; (2) mixing a product obtained in the step (1) with a silane coupling agent for surface modification; and (3) drying and filtering the product obtained in the step (2). According to the method, ground calcium carbonate powder can be relatively fully modified, so that the ground calcium carbonate powder has good compatibility with the silicone adhesive; the filling ratio of the ground calcium carbonate is improved on the premise of ensuring the quality of the silicone adhesive; the production cost of the silicone adhesive is reduced; and the thixotropy of the silicone adhesive is improved. Meanwhile, the invention further provides the ground calcium carbonate employing the method.

Description

technical field [0001] The invention belongs to the research on the surface modification method of calcium carbonate, in particular to a surface modification method of special ground calcium carbonate for silicone glue and the surface modified ground calcium carbonate. Background technique [0002] Silicone glue is a paste made of polydimethylsiloxane as the main raw material, supplemented with crosslinking agents, fillers, plasticizers, coupling agents, and catalysts in a vacuum state. Water in the air should cure to form an elastic silicone rubber. It can be used in construction, automobile industry, electronics and radio industry, mechanical processing, aerospace, solar energy, toys and other fields. It has a wide range of uses, and silicone glue has a large market demand. [0003] In order to reduce the production cost of silicone rubber and improve certain properties of silicone rubber such as thixotropy, a certain proportion of fillers need to be added. The filler use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K9/06C08K9/04C08K3/26C09C1/02C09C3/08C09C3/12
CPCC08K9/06C08K3/26C08K9/04C08K2003/265C09C1/021C09C3/006C09C3/08C09C3/12C08L83/04
Inventor 叶有李奇洪黄华彬唐洋喜胡声琴周琨琪贝进国谢献娥
Owner 广西贺州市科隆粉体有限公司
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