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Modifier, modified wollastonite modified by modifier, and preparation method and application of modified wollastonite

A technology of wollastonite and modifier, applied in the field of modified polypropylene, which can solve the problems of low heat distortion temperature, poor modification effect, and high modification cost

Inactive Publication Date: 2021-04-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the non-polar crystallization of polypropylene molecules and large molding shrinkage, polypropylene has poor mechanical properties, poor dimensional stability, low heat distortion temperature, and poor weather resistance and aging resistance.
In terms of physical and mechanical properties, it is characterized by high brittleness and low notched impact strength, which greatly restricts the further popularization and application of polypropylene as structural materials and engineering materials.
[0004] The modified polypropylene in the prior art has problems such as high modification cost, complex modification process, poor modification effect, and low comprehensive mechanical properties after modification, which limit its application range as plastics. In order to broaden the polypropylene To adapt to market requirements and save costs, it is necessary to explore new modified materials to modify polypropylene to improve the mechanical properties of polypropylene and broaden the application range of polypropylene

Method used

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  • Modifier, modified wollastonite modified by modifier, and preparation method and application of modified wollastonite
  • Modifier, modified wollastonite modified by modifier, and preparation method and application of modified wollastonite
  • Modifier, modified wollastonite modified by modifier, and preparation method and application of modified wollastonite

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Experimental program
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Embodiment 1

[0030] like figure 1 Shown, be the preparation process flowchart of modified wollastonite of the present invention, concrete preparation process steps are as follows:

[0031] Add 10g of wollastonite, 0.1g of stearic acid and 0.1g of silane coupling agent KH-570 to 300mL of absolute ethanol, and mix the modifier and wollastonite evenly under the action of ultrasonic dispersion and mechanical stirring. React at a temperature of 60°C for 1 hour, keep stirring during the entire heating reaction process, the stirring speed is 300rpm, after the reaction is completed, cool naturally, collect the precipitate in the mixed solution by suction filtration at room temperature, and dry the precipitate in an oven at 70°C for 12 hours , to obtain modified wollastonite.

[0032] like figure 2 and 3 As shown, the SU8010 field emission electron microscope was used to observe the surface morphology of wollastonite before and after modification. By comparing the electron microscope photos of ...

Embodiment 2

[0040] The preparation process of embodiment 2 is basically the same as that of embodiment 1, and the difference is that the volume of dehydrated alcohol is 333mL, and the total mass of modifier is respectively 0.1g, 0.2g, 0.3g, 0.4g, wherein stearic acid The ratio of the mass to the mass of the silane coupling agent KH-570 is 1:1, such as Figure 5 Shown is the relationship diagram between the change of modifier content and the oil absorption value of modified wollastonite, which is represented by Figure 5 It can be seen that when the total mass of the modifier is 2% of the wollastonite mass, the oil absorption value of the modified wollastonite is the lowest, and the optimum modifier ratio is 2%.

Embodiment 3

[0042] The preparation process of embodiment 3 is basically the same as that of embodiment 1, the difference is that the volume of dehydrated alcohol is 333mL, the total mass of modifier is 0.2g, and the amount of stearic acid and silane coupling agent KH-570 is adjusted. Mass ratio, the silane coupling agent KH-57 in the present embodiment accounts for 30%, 40%, 50%, 60%, 70% of the modifier gross mass respectively, as Image 6 Shown is the relationship diagram between the mass proportion of silane coupling agent KH-57 and the oil absorption value of modified wollastonite, which is represented by Image 6 It can be seen that when the silane coupling agent KH-57 accounts for 50% of the total mass of the modifier, the oil absorption value of the modified wollastonite is the lowest, and the optimal mass proportion of the silane coupling agent KH-57 is 50%.

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Abstract

The invention discloses a modifier, modified wollastonite modified by the modifier, and a preparation method and application of the modified wollastonite. The modifier comprises a mixture of stearic acid and a silane coupling agent KH-570, the silane coupling agent KH-570 is hydrolyzed to generate silanol, and then reacts with alkyl on the surface of wollastonite, an organic coating layer is formed on the surface of the wollastonite, and the surface of the wollastonite is organized; stearic acid reacts with the wollastonite to generate stearate which coats the surface of wollastonite; the stearic acid is rich in carboxyl, and an acidic environment provided by ionization of stearic acid is more beneficial to surface reaction of the silane coupling agent KH-570 and the wollastonite, so that the surface organizing effect of the wollastonite is good, the modified wollastonite can be better combined with polypropylene plastic, and the mechanical property of the polypropylene plastic can be improved. The modified wollastonite is simple in modification process and good in modification effect, the polypropylene plastic is filled with the modified wollastonite, the bending property of the polypropylene plastic can be greatly improved, and the application range of polypropylene plasticity is expanded.

Description

technical field [0001] The invention relates to the technical field of modified polypropylene, in particular to a modifier, modified wollastonite modified by the modifier, and a preparation method and application thereof. Background technique [0002] As a new type of industrial mineral, wollastonite is widely used due to its excellent properties such as fibrous structure, high aspect ratio, stable chemical properties, and low water absorption. With the rapid development of science and technology, under the continuous exploration of scientists, potential new uses of wollastonite are being discovered one after another, and the market demand for wollastonite at home and abroad continues to grow. It is particularly important to carry out surface modification and deep processing of wollastonite to synthesize new composite functional materials and improve the high added value of resource utilization. [0003] As one of the most important general-purpose plastics today, polypropy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/30C09C3/08C09C3/12C08K9/10C08K9/06C08K9/04C08K7/10C08L23/12
CPCC01P2006/19C08K7/10C08K9/04C08K9/06C08K9/10C09C1/309C09C3/006C09C3/08C09C3/12C08L23/12
Inventor 葛文冉霞刘粲
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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