Surface treatment method of special nanometer calcium carbonate for polyurethane sealant

A polyurethane sealant and nano-calcium carbonate technology, which is applied in the direction of inorganic pigment treatment, dyeing physical treatment, chemical instruments and methods, etc., can solve the problem that nano-calcium carbonate cannot meet the production requirements of high-quality polyurethane sealant, and modifiers are easy to precipitate, etc. problems, to achieve the effect of weakening the macroscopic phase separation, shortening the dry time, and promoting the microphase separation

Active Publication Date: 2016-01-20
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This method only uses conventional stearic acid as a treatment agent, and stearic acid can only form physical adsorption on the surface of calcium carbonate, and the modifier is easy to precipitate
[0007] In summary, the nano-calcium carbonate produced by existing technologies cannot meet the production needs of high-quality polyurethane sealants

Method used

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  • Surface treatment method of special nanometer calcium carbonate for polyurethane sealant

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Experimental program
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preparation example Construction

[0032] Preparation of nano calcium carbonate slurry:

[0033] Limestone with a CaCO3 content greater than 98.5% is calcined at 1050°C for 3 hours to obtain quicklime; quicklime and water are fully digested at a temperature of 70±5°C at a weight ratio of 1:5 to obtain slaked lime slurry; the lime slurry is sieved to remove slag, and water is added Dilute to a Ca(OH)2 solid content of 10-12%, control the freezing temperature at 15-22°C; pass lime kiln gas with a CO2 volume concentration of 28-33% into the lime slurry to react until the system pH<7.5 to prepare nano-calcium carbonate slurry. The dry powder of the nano-calcium carbonate slurry used in the embodiment of the present invention has a specific surface area of ​​25-35 m2 / g, and has a cubic-like regular shape.

Embodiment 1

[0035] according to figure 1 The process flow shown is to process the nano-calcium carbonate slurry. The newly prepared pH is 6.8, BET specific surface area is 25.3m 2 / g, mass concentration is that 10% nano-calcium carbonate suspension is added in the reaction kettle, start agitator, pass into water vapor heating temperature to 75 ℃, constant temperature; Add 2.5% (calcium carbonate dry basis mass) fatty acid and lysine The mixed saponification solution of acid, wherein the mass ratio of fatty acid and lysine is 1:1, the fatty acid is stearic acid, the saponification agent is sodium hydroxide, and its addition is 17% of the total weight of fatty acid and lysine, stirring 40 minutes to complete the first surface treatment. The treated nano-calcium carbonate slurry is squeezed and dried with a chain-belt dryer, and the moisture content of the dried material is lower than 0.28%. The dried material is pulverized by a pin mill pulverizing device to obtain the primary product na...

Embodiment 2

[0038] according tofigure 1 The process flow shown is to process the nano-calcium carbonate slurry. The newly prepared pH is 6.8, BET specific surface area is 31.2m 2 / g, the nanometer calcium carbonate suspension that mass concentration is 10% is added in the reaction kettle, start agitator, pass into water vapor heating temperature to 75 ℃, constant temperature; Then add 3.0% (calcium carbonate dry basis) fatty acid and lysine Mixed saponification solution of acid, wherein the mass ratio of fatty acid and lysine is 1:1, the fatty acid is stearic acid, the saponification agent is sodium hydroxide, and its addition is 17% of the total weight of fatty acid and lysine, stirred for 40 Minutes to complete the first surface treatment. The treated nano-calcium carbonate slurry is squeezed and dried with a chain-belt dryer, and the moisture content of the dried material is lower than 0.28%. The dried material is crushed and classified by a pin mill crushing equipment to obtain the ...

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Abstract

The invention discloses a surface treatment method of special nanometer calcium carbonate for polyurethane sealant. The surface treatment method includes the steps that 1, paste making is performed; 2, in primary surface treatment, a mixed saponification solution of fatty acid and lysine is added for stirring; 3, in dehydration and drying, modified nanometer calcium carbonate is dehydrated and dried; 4, in primary crashing, powder is crashed; 5, in secondary surface treatment, nanometer calcium carbonate is added into a stirring machine to be stirred in a heating mode, when material temperature is increased to 80 DEG C-90 DEG C, a mixed modifying agent of dimethicone and 3-(3- aminophenoxy) propyl trimethoxy silane is added, and when the material temperature is increased to 100 DEG C-110 DEG C, stirring is stopped, and discharging is performed; 6, in secondary crashing, nanometer calcium carbonate is crashed again. The polyurethane sealant is filled with nanometer calcium carbonate modified through the method, and therefore the mechanical property of the polyurethane sealant is remarkably improved, and surface drying time is shortened. The preparation method is simple, the production cost is low, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of nano-calcium carbonate, in particular to a surface treatment method of nano-calcium carbonate specially used for polyurethane sealants. Background technique [0002] Nano-calcium carbonate is an extremely important type of industrial calcium carbonate, widely used in plastics, rubber, coatings, adhesives, inks and other fields. Due to its large specific surface area, it has high surface activity and exhibits strong surface binding energy. The application of high-quality nano-calcium carbonate to polymer materials not only plays the role of incremental filling, but also endows some polymer composite materials with better processing properties, improves the mechanical properties of composite materials, beautifies the appearance of products, and acts as a functional modification. In the polyurethane sealant processing industry, nano-calcium carbonate has become an indispensable and important filler, which mainly play...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/12C09C3/06C09C3/04
Inventor 颜干才熊文谌业文林进超罗元庆韦领生
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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