A kind of modified calcium carbonate and its preparation method and application

A calcium carbonate and modification technology, which is applied in the field of modified calcium carbonate and its preparation, can solve the problems of small inert organic groups, weak force, and weak intermolecular force, so as to improve mechanical properties and increase filling capacity , Reduce the effect of processing viscosity

Active Publication Date: 2018-12-11
黄驰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main modification method of calcium carbonate is the surface modification method, which is often modified by various coupling agents, fatty acids and their salts, surfactants, etc., and the compatibility of modified calcium carbonate in polymers is greatly improved. , but because these modifiers are small molecular compounds, the inert organic groups are relatively small, and the intermolecular force between the organic polymer system and the organic polymer system is relatively weak, which may cause the calcium carbonate powder and the organic polymer system. The acting force is not strong, so that the effect of calcium carbonate powder on reinforcing polymer materials is limited, and the filling amount of powder should not be too high

Method used

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  • A kind of modified calcium carbonate and its preparation method and application
  • A kind of modified calcium carbonate and its preparation method and application
  • A kind of modified calcium carbonate and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0021] The calcium carbonate modifying agent used in the present embodiment is the mixture shown in formula I of structure, and wherein degree of polymerization n is 5; R 1 is methyl; R 2 is methoxy; R 3 for—CH 2 NH 2 or—CH 2 CH 2 NH 2 .

[0022]

[0023] The preparation method of the above-mentioned calcium carbonate modifier is: add 50 mass parts petroleum ether, 20 mass parts aminomethyl trimethoxysilane and 80 mass parts aminoethyl trimethoxysilane in the reactor, after stirring evenly, add 50 mass parts Parts by mass of single-ended hydroxyl polyethylene with a polymerization degree of 5, after reflux reaction at 60°C for 0.5h, distill off petroleum ether and produced methanol at 100°C, then heat up and distill under reduced pressure to remove unreacted aminomethyl Trimethoxysilane and aminoethyltrimethoxysilane, that is, aminoalkoxysilane modified with hydroxyl-terminated polyethylene, that is, modifier.

[0024] A kind of modified calcium carbonate, adopts ab...

Embodiment 2

[0029] The calcium carbonate modifying agent structure used in the present embodiment is as shown in formula II, and wherein n is 120; R 1 is ethyl; R 2 is methyl; R 3 for—CH 2 CH 2 CH 2 NHCH 2 CH 2 NH 2 .

[0030]

[0031] The preparation method of the above-mentioned calcium carbonate modifier is: add 150 mass parts of n-hexane, 100 mass parts of N-aminoethyl-aminopropylmethyldiethoxysilane in the reactor, after stirring evenly, add 400 mass parts Double-ended hydroxyl polyethylene with a degree of polymerization of 120, after reflux reaction at 100°C for 8 hours, distill off the produced ethanol and n-hexane at 100°C, then heat up and distill under reduced pressure to remove unreacted N-aminoethyl- Aminopropylmethyldiethoxysilane, which is an aminoalkoxysilane modified by hydroxyl-terminated polyethylene.

[0032] A kind of modified calcium carbonate, adopts above-mentioned modifying agent to carry out modification gained, and concrete preparation method mainly ...

Embodiment 3

[0037] The structure of the calcium carbonate modifier used in this embodiment is shown in formula II, which is a mixture of two kinds of aminoalkoxysilanes modified by hydroxyl-terminated polyethylene, wherein modifier 1 is: n is 80, R 1 is ethyl, R 2 is ethoxy, R 3 for—CH 2 CH 2 CH 2 NH 2 , Modifier 2 is: n is 80, R 1 is ethyl, R 2 is methyl, R 3 for—CH 2 CH 2 CH 2 NH 2 .

[0038]The preparation method of the above-mentioned calcium carbonate modifier is: add 300 mass parts of toluene, 20 mass parts of tetrahydrofuran, 90 mass parts of aminopropyltriethoxysilane and 10 mass parts of aminopropylmethyldiethoxysilane in the reactor Silane, after stirring evenly, add 280 parts by mass of hydroxyl-terminated polyethylene with a degree of polymerization of 80, reflux at 70°C for 5 hours, distill out the ethanol, tetrahydrofuran and toluene at 100°C, then heat up The unreacted aminopropyltriethoxysilane and aminopropylmethyldiethoxysilane were distilled off under reduc...

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Abstract

The invention discloses modified calcium carbonate. Modified calcium carbonate is prepared by modifying by virtue of amino alkoxy silane modified through a modifying agent, namely hydroxyl-terminated polyethylene. Obtained modified calcium carbonate has good lipophilicity and can be well dispersed into polymer molecules, so that the filling amount of calcium carbonate is substantially increased, the processing viscosity of a mixed system is reduced, and the mechanical property of the mixed system is substantially improved.

Description

technical field [0001] The invention relates to the technical field of inorganic powder surface modification, in particular to a modified calcium carbonate and a preparation method thereof. Background technique [0002] Calcium carbonate is a very common inorganic powder filler. It has the advantages of low price, non-toxic and tasteless, high whiteness, and good hardness. It is widely used in plastics, rubber, paper, ink, coatings and other fields. Since calcium carbonate is an inorganic substance with poor compatibility with organic substances, it is difficult to directly fill calcium carbonate into organic polymer systems. Therefore, calcium carbonate powder needs to be modified in practical applications. [0003] At present, the main modification method of calcium carbonate is the surface modification method, which is often modified by various coupling agents, fatty acids and their salts, surfactants, etc., and the compatibility of modified calcium carbonate in polymers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K9/10C08K3/26C08L23/06
CPCC08K3/26C08K9/06C08K9/10C08K2003/265C08L23/06
Inventor 黄驰胡铭杰廖俊关昊孙建国邓宪波
Owner 黄驰
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