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In-situ emulsification modification method for nano calcium carbonate for polyurethane sealant

A technology of polyurethane sealant and nano-calcium carbonate, which is applied in the direction of chemical instruments and methods, polyurea/polyurethane adhesives, adhesives, etc., can solve the problems that the modification process cannot be refined economically and effectively, and the formation of inclusions can be reduced. Achieve the effects of easy industrial promotion, reduced generation, and strong controllability

Inactive Publication Date: 2016-04-27
浙江天石纳米科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is that the existing modification process cannot economically and effectively refine the nano-calcium carbonate particles, reduce the formation of inclusions, reduce the pH and moisture of the product, solve the contradiction between improving thixotropy and reducing viscosity, and improve Powder processing and application performance, thus providing an in-situ emulsification modification method of nano-calcium carbonate for polyurethane sealant, which has the advantages of simple process, strong controllability, high reliability and easy industrialization

Method used

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  • In-situ emulsification modification method for nano calcium carbonate for polyurethane sealant
  • In-situ emulsification modification method for nano calcium carbonate for polyurethane sealant
  • In-situ emulsification modification method for nano calcium carbonate for polyurethane sealant

Examples

Experimental program
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Effect test

example 1

[0028] Example 1, the specific implementation steps are:

[0029] (1) Add 20m 3 The above prepared nano-calcium carbonate cooked pulp and an appropriate amount of emulsifier, start the wheel-type mixer, stir, mix, and homogenize for 15 minutes; the emulsifier is sodium dodecylbenzenesulfonate, and the addition amount is 10 kg;

[0030] (2) Turn on the high-shear emulsification pump and carry out high-shear refinement to the slurry obtained in step (1) for 15 min; the rotating speed of the high-shear emulsification pump is 3500r / min;

[0031] (3) In terms of calcium carbonate mass, gradually add 2.5% composite modifier in the modification tank, close the emulsification pump after high-shear emulsification for 25 minutes, and continue to stir for 30 minutes; the composite modifier is oleic acid: sodium laurate: hard Aluminum stearate and lanthanum isostearate are compounded according to the weight ratio of 40:50:8:2;

[0032] (4) The slurry obtained in step (3) is subjected to...

example 2

[0033] Example 2, the specific implementation steps are:

[0034] (1) Add 20m 3 Prepare the nano-calcium carbonate cooked pulp and an appropriate amount of emulsifier above, start the wheel-type mixer, stir, mix, and homogenize for 15 minutes; 12 kg;

[0035] (2) Turn on the high-shear emulsification pump to carry out high-shear refinement for 15 min to the slurry obtained in step (1); the rotating speed of the high-shear emulsification pump is 4500r / min;

[0036] (3) In terms of calcium carbonate mass, gradually add 2.0% composite modifier in the modification tank, close the emulsification pump after high-shear emulsification for 25 minutes, and continue to stir for 30 minutes; the composite modifier is oleic acid: sodium stearate: Coconut oil and cerium isostearate are compounded according to the weight ratio of 40:50:8:2;

[0037] (4) The slurry obtained in step (3) is subjected to aging, thickening, pressure filtration, dynamic drying at 230° C., crushing and grading to...

example 3

[0038] Example 3, the specific implementation steps are:

[0039] (1) Add 20m 3 Prepare the nano-calcium carbonate cooked pulp and an appropriate amount of emulsifier, start the wheel mixer, stir, mix, and homogenize for 10 minutes; the emulsifier is made of fatty acid methyl ester polyether sodium sulfonate and ACUSOL830 in a mass ratio of 1:1. The amount added is 8 kg;

[0040] (2) Turn on the high-shear emulsification pump to carry out high-shear refinement to the slurry obtained in step (1) for 20 min; the rotating speed of the high-shear emulsification pump is 5000r / min;

[0041] (3) In terms of calcium carbonate mass, gradually add 3.0% composite modifier in the modification tank, close the emulsification pump after high-shear emulsification for 25 minutes, and continue stirring for 30 minutes; the composite modifier is isostearic acid: sodium oleate : Aluminum diisostearate, lanthanum isostearate, and cerium isostearate are compounded according to the weight ratio of ...

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Abstract

The invention discloses an in-situ emulsification modification method for nano calcium carbonate for a polyurethane sealant. The in-situ emulsification modification method includes the following steps: adding carbonized nano calcium carbonate slurry and an emulsifier, stirring, mixing, and homogenizing; adding a compound modifier, carrying out high shearing emulsification, continuing to stir, carrying out shear refining and depolymerizing; and aging, thickening, filter-pressing, drying, crushing and grading. The method has the beneficial effects that the formation of nano calcium carbonate inclusions is reduced, the pH and the water content of the product are lowered, the fineness and thixotropy of a powder are improved, the viscosity is effectively controlled, and the method is simple in whole technological process, strong in controllability, high in reliability, and easy to industrialize and promote.

Description

technical field [0001] The invention relates to an in-situ emulsification modification method for significantly improving the application performance of nano-calcium carbonate powder, which is especially suitable for the surface modification treatment of nano-calcium carbonate for room temperature vulcanization single-component polyurethane sealant, and belongs to inorganic powder and nano-materials The field of production preparation and functionalization. Background technique [0002] Nano-calcium carbonate is currently the most cost-effective inorganic nano-powder material. It not only plays the role of incremental filling and reduces production costs, but also plays a reinforcing role in polymer materials, improving their hardness, rigidity and dimensional stability. endow it with some special physical and chemical properties. Therefore, nano-calcium carbonate is widely used in industries and fields such as functional rubber, plastics, inks, and coatings. However, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/04C09J175/04C09J11/04
CPCC09C1/021C08K3/26C08K9/04C08K2003/265C09C3/006C09C3/04C09C3/08C09J11/04C09J175/04
Inventor 田伟周新民王璟琳罗清平
Owner 浙江天石纳米科技股份有限公司
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