Wollastonite powder surface wet modification method assisted by microwave

A wollastonite powder and microwave-assisted technology, which is applied in microwave heating, chemical instruments and methods, climate sustainability, etc., can solve the problems of low heating efficiency and inability to heat, improve thermal efficiency and heating speed, overcome low thermal efficiency, The effect of maintaining physical properties

Inactive Publication Date: 2009-09-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the heating efficiency is low
In addition, the traditional heat conduction heating method cannot selectively heat the components of the mixed material in the same device

Method used

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  • Wollastonite powder surface wet modification method assisted by microwave
  • Wollastonite powder surface wet modification method assisted by microwave
  • Wollastonite powder surface wet modification method assisted by microwave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Microwave-assisted wollastonite powder surface wet modification device:

[0036] (1) Microwave oven structure

[0037] a) Simple devices for laboratory use such as figure 1As shown, 1 is an electric control device; 2 is a stirring motor; 3 is a three-way glass tube; 4 is a stirrer, which is composed of a stirring shaft and paddle blades; 5 is a temperature sensor; 6 is a glass container; 7 is a constant temperature microwave oven. Connect thermocouples and relays to the constant temperature microwave oven circuit, open a round hole in the center of the top of the constant temperature microwave oven 7, and set a copper mesh or metal ring with a height of about 5 to 10 cm around the hole (to prevent microwave leakage), and a three-way glass tube 3 Sealed connection with the slurry glass container 6 in the constant temperature microwave oven 7 through the round hole, the stirring rod with the paddle enters the slurry through the polytetrafluoroethylene stirring ...

Embodiment 2

[0040] Embodiment 2 The best process and process conditions of the present invention

[0041] Take 0.9 g of γ-aminopropyltriethoxysilane (KH550) as a coupling agent, mix it by volume ratio coupling agent: deionized water: ethanol = 1:1:3, adjust the pH value to 3.5 with acetic acid, and hydrolyze 60 minutes, dubbed hydrolyzate.

[0042] In the flask, add 10g of wollastonite powder into 100ml of ethanol to form a slurry; put the flask into a constant temperature microwave oven, stir and heat to 80°C; then slowly add the hydrolyzate into the slurry, and stir for 30 Minutes; After the sample was suction filtered, it was dried in a constant temperature microwave oven at 115°C for 30 minutes.

[0043] The dried sample was extracted in acetone solution for 8 hours, and then dried to obtain a chemically grafted sample. The grafting rate was measured to be 3.75%.

Embodiment 3

[0044] Embodiment 3 The preferred process and process conditions (1) of the present invention:

[0045] Take 0.9 g of γ-aminopropyltriethoxysilane (KH550) as the coupling agent, mix the coupling agent by volume: deionized water: ethanol = 1:1:2, adjust the pH value to 3.5 with acetic acid, and hydrolyze 60 minutes, dubbed hydrolyzate.

[0046] In the flask, add 10g of wollastonite powder into 60ml of ethanol to form a slurry; put the flask into a constant temperature microwave oven, stir and heat to 70°C; then slowly add the hydrolyzate into the slurry, and stir for 15 Minutes; After the sample was suction filtered, it was dried in a constant temperature microwave oven at 130°C for 60 minutes.

[0047] The dried sample was extracted in acetone solution for 8 hours, and then dried to obtain a chemically grafted sample. The grafting rate was measured to be 2.38%.

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Abstract

The invention relates to a wollastonite powder surface wet modification method assisted by microwave, which belongs to the technical field of powder surface modification. KH550 is used as coupling agent. The method comprises the processes of hydrolysate solution preparing, microwave-assisted coupled reaction, extraction and drying. The process of the microwave-assisted coupled reaction is as follows: wollastonite powder and ethanol are prepared into slurry to be put a constant-temperature microwave oven and stirred and heated to 50-80 DEG C; the hydrolysate solution is dripped into the slurry slowly and is stirred to react for 15 to 60 minutes; and a sample is dried in the constant-temperature microwave oven under the temperature of 90-130 DEG C after suction filtration. Compared with the prior wollastonite powder surface wet modification method, the invention uses the characteristic of heating by the microwave completely and realizes the goals of being assisted by microwave radiation and intensifying modification; the invention does not change the wollastonite crystal structure and the molecular structure of the coupling agent; and the invention can control the temperature exactly and ensures that the thermal efficiency and the heating speed during the modifying process are improved greatly.

Description

technical field [0001] The invention belongs to the technical field of powder surface modification, and in particular relates to a simple and efficient method for microwave-assisted wollastonite powder surface wet modification. Background technique [0002] Wollastonite powder is widely used as pigments and fillers in organic polymer materials and composite materials such as plastics, rubber and fibers, as well as paints, coatings and adhesives. Wollastonite itself is an inorganic substance as a filler or pigment and filler. Although direct addition can reduce the cost of organic polymer materials and composite materials and increase their stability, rigidity, flame retardancy and insulation, etc., due to Different from the interface properties of organic polymers, the compatibility is poor, and it is difficult to disperse uniformly; too much addition often easily leads to the disadvantages of mechanical strength reduction and brittleness of the material. Therefore, in addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/00C09C3/08C09C3/04H05B6/64
CPCY02P20/10
Inventor 邹勃张明喆陈育良邹广田
Owner JILIN UNIV
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