Preparation method for nano calcium carbonate special for low modulus silicone adhesive

A nano-calcium carbonate and silicone adhesive technology, which is applied in chemical instruments and methods, adhesives, dyed organic silicon compound processing, etc., can solve the problems of reducing the modulus of silicone adhesives and failing to meet the requirements for the use of low-modulus silicone adhesives. , to achieve the effect of improving the carbonization effect, meeting the requirements of use and improving the dispersibility

Active Publication Date: 2017-09-01
FUJIAN HONGFENG NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium carbonate is an important filler in silicone rubber. The use of ordinary calcium carbonate on the market is not conducive to reducing the modulus of silicone rubber, and cannot meet the requirements of low modulus silicone rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The preparation method of nano-calcium carbonate special for low modulus silicone glue is implemented according to the following steps:

[0016] ① Preparation of Ca(OH) 2 Slurry: Calcium oxide is obtained by calcining limestone, and the calcium oxide is digested with hot water at 50-60°C to obtain Ca(OH) with a mass percentage concentration of 13%. 2 , Ca(OH) 2 Aging at 50-60°C for 18 hours, then sieving to obtain refined Ca(OH) 2 slurry;

[0017] ② Carbonization: Ca(OH) 2 The mass percentage of the slurry is controlled at 8.5%, the temperature is controlled at 18-22°C, and it is input into the carbonization tower, and then sodium polyacrylate with a molecular weight of 4000-5000, sodium polyacrylate and Ca(OH) 2 The weight ratio of the slurry is 0.2︰100, then add citric acid, citric acid and Ca(OH) 2 The weight ratio of the slurry is 0.2:100, and then CO is introduced 2 The kiln gas with a volume content of 28% is carbonized;

[0018] ③ Add crystal form modifier...

Embodiment 2

[0023] The preparation method of nano-calcium carbonate special for low modulus silicone glue is implemented according to the following steps:

[0024] ① Preparation of Ca(OH) 2 Slurry: Calcium oxide is obtained by calcining limestone, and the calcium oxide is digested with hot water at 50-60°C to obtain Ca(OH) with a mass percentage concentration of 15%. 2 , Ca(OH) 2 Aging at 50-60°C for 32 hours, then sieving to obtain refined Ca(OH) 2 slurry;

[0025] ② Carbonization: the refined Ca(OH) 2 The mass percentage of the slurry is controlled at 10%, the temperature is controlled at 18-22°C, and it is input into the carbonization tower, and then sodium polyacrylate with a molecular weight of 4000-5000, sodium polyacrylate and Ca(OH) 2 The weight ratio of the slurry is 0.5:100, then add sulfuric acid, sulfuric acid and Ca(OH) 2 The weight ratio of the slurry is 0.5:100, and then CO is introduced 2 The kiln gas with a volume content of 35% is carbonized;

[0026] ③Add crystal...

Embodiment 3

[0031] The preparation method of nano-calcium carbonate special for low modulus silicone glue is implemented according to the following steps:

[0032] ① Preparation of Ca(OH) 2 Slurry: Calcium oxide is obtained by calcining limestone, and the calcium oxide is digested with hot water at 50-60°C to obtain Ca(OH) with a mass percentage concentration of 14%. 2 , Ca(OH) 2 Aging at 50-60°C for 25 hours, then sieving to obtain refined Ca(OH) 2 slurry;

[0033] ② Carbonization: the refined Ca(OH) 2 The mass percentage of the slurry is controlled at 9.5%, the temperature is controlled at 20°C, and it is input into the carbonization tower, and then sodium polyacrylate with a molecular weight of 4000-5000, sodium polyacrylate and Ca(OH) 2 The weight ratio of the slurry is 0.3:100, then add aluminum sulfate, aluminum sulfate and Ca(OH) 2The weight ratio of the slurry is 0.3:100, and then CO is introduced 2 The kiln gas with a volume content of 31% is carbonized;

[0034] ③ Add cry...

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PUM

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Abstract

The invention discloses a preparation method for nano calcium carbonate special for low modulus silicone adhesive. The preparation method is implemented according to the following steps: 1) preparing Ca(OH)2 slurry; 2) carrying out carbonization; 3) adding a crystal form conditioning agent; 4) carrying out surface treatment; 5) adding a modulus conditioning agent; 6) carrying out filter pressing, drying and smashing on calcium carbonate boiled size in after the modulus conditioning agent is added to prepare the nano calcium carbonate special for the low modulus silicone adhesive, wherein the moisture of the nano calcium carbonate is less than or equal to 0.3%. The nano calcium carbonate prepared by the preparation method has good compatibility with polydimethylsiloxane, and cohesive energy is reduced after the nano calcium carbonate and the polydimethylsiloxane are mixed so as to achieve an effect of lowering silicone adhesive product modulus.

Description

technical field [0001] The invention relates to the technical field of nano-calcium carbonate production, in particular to a preparation method of nano-calcium carbonate specially used for low-modulus silicone glue. 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. At present, silicone glue has been widely used in the joint sealing of various glass, aluminum materials, tiles, concrete, cement, etc., but the concrete expansion joints of roads, tunnels, and bridges need to use low modulus and high elongation. Silicone glue is used to cope with the large horizontal and vertical displacement between concrete slabs, because if the modulus of silicone glue is too high, during the deformation process of concrete joints, silicone glue is prone to bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04C09C3/06C09C3/08C09C3/10C09C3/12C09J183/04C09J11/04
CPCC08K3/26C08K9/04C08K2003/265C09C1/022C09C3/006C09C3/04C09C3/06C09C3/08C09C3/10C09C3/12C09J11/04C09J183/04
Inventor 邹林富刘亚雄雷水根
Owner FUJIAN HONGFENG NANO TECH
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