Preparation method of modified diatomite/polyethylene composite plastic

A composite plastic and diatomite technology, applied in the field of composite materials, can solve the problems of carbon dioxide emission, environmental stress cracking, low strength, etc., and achieve the effects of reducing carbon dioxide emissions, improving compatibility, and enhancing compatibility.

Active Publication Date: 2013-02-06
YINGKOU DONGSHENG IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyethylene is the most widely used polymer material, its product strength is not high, low hardness, environmental stress cracking and other problems inhibit the expansion of its application field
In recent years, modification by adding micro / nano calcium carbonate is an effective means to improve the mechanical properties of PE matrix and has been widely used. However, calcium carbonate modification is usually added in an amount of more than 30%, and plastics with calcium carbonate added after use The waste products will produce a large amount of carbon dioxide emissions in the subsequent treatment process, which cannot meet the economic development requirements of today's low-carbon economy and green environmental protection.
[0004] At present, in diatomite / polymer material literature reports, Chinese patent [201110061999.7] discloses polyvinyl chloride / diatomite composite film and its preparation method and application; patent [201110079156.X] discloses thermoplastic polyurethane (TPU) / Preparation method of diatomite composite material; patent [201010262549.X] discloses a preparation method of diatomite / natural rubber composite material; patent [200810235449.0] discloses polyimide / diatomite composite material and its preparation Method; there is no report on the preparation of polyethylene composite plastics with surface modified diatomite

Method used

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  • Preparation method of modified diatomite/polyethylene composite plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) First mechanically crush and ball-mill the diatomite, then dry the ultra-fine diatomite with an average particle size of ≤1 μm in a vacuum oven at 120°C for 3 hours, after cooling, weigh the diatomite and mix it with ethanol, Ultrasonic disperse for 30 minutes, then add modifier stearic acid, react with mechanical stirring at 50°C for 8h, then centrifuge at 5000rpm, the separated solid product is washed twice with absolute ethanol, and finally vacuum-dried at 90°C After 24 hours, modified diatomite was obtained; the mixing ratio of diatomite and ethanol was 0.15g / mL, and the amount of modifying agent was 4% of the weight of diatomite;

[0026] (2) Add the stearic acid-modified diatomite and polyethylene into the internal mixer, set the temperature of the front section, middle section, and rear section of the internal mixer to 180°C, and blend at 40rpm for 20 minutes. Hot press at 10MPa and 170°C for 10 minutes by a flat vulcanizer to make a diatomite / polyethylene co...

Embodiment 2

[0029] (1) First mechanically crush and ball-mill the diatomite, then dry the ultra-fine diatomite with an average particle size of ≤1 μm in a vacuum oven at 150°C for 1 hour, after cooling, modify the titanate coupling agent The agent is directly mixed with ethanol, and then the mixture is evenly sprayed on the surface of the cooled diatomite, then stirred at 3000 rpm for 15 minutes, and finally vacuum-dried at 120°C for 10 hours to obtain titanate coupling agent-modified diatom soil; the modifier and ethanol are mixed according to a volume ratio of 1:10, and the spraying amount of the mixed solution is 1% of the diatomaceous earth weight as the modifier in the mixed solution;

[0030] (2) Add the above titanate coupling agent-modified diatomite and polyethylene into the internal mixer, set the temperature of the front section, middle section, and rear section of the internal mixer to 180°C, and blend at 10rpm for 50 Minutes later, hot press at 15MPa and 160°C for 15 minutes ...

Embodiment 3

[0033](1) First mechanically crush and ball-mill the diatomite, then dry the ultra-fine diatomite with an average particle size of ≤1 μm in a vacuum oven at 150°C for 1 hour, and mix the Si69 modifier directly with ethanol after cooling , and then evenly spray the mixed solution on the cooled diatomite surface, then stir at 2000 rpm for 15 minutes, and finally vacuum-dry at 120° C. for 10 hours to obtain Si69 modified diatomite; the modifier and ethanol Mix according to the volume ratio of 1:5, and the spraying amount of the mixed solution is based on the modifier being 10% of the weight of diatomite in the mixed solution;

[0034] (2) Add the above-mentioned Si69 modified diatomite and polyethylene into the internal mixer, set the temperature of the front section, middle section, and rear section of the internal mixer to 180°C, blend at 100rpm for 10 minutes, and pass through the flat plate The vulcanizer is hot-pressed at 8MPa and 180°C for 8 minutes to make a diatomite / poly...

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Abstract

The invention belongs to the field of composite materials and particularly relates to a preparation method of modified diatomite/polyethylene composite plastic. The preparation method comprises the steps as follows: drying superfine diatomite and then mixing the dried superfine diatomite and alcohol, conducting ultrasonic dispersion, adding a modifier, mechanically stirring, centrifugally separating, and conducting vacuum drying on a solid product obtained by separation for 1-24h to obtain the modified diatomite; or directly mixing the modifier and the alcohol, uniformly spraying a mixed solution onto the surface of the cooled diatomite to obtain the modified diatomite, adding the modified diatomite and polyethylene to an internal mixer for blending, and then conducting hot pressing with a plate vulcanizing machine to fabricate a diatomite/polyethylene composite plastic plate. The method adopts superfine and surface modification technologies to prepare the novel low-carbon, low-emission and environment-friendly polyethylene plastic which can be used for replacing a calcium carbonate filler in plastics.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a preparation method of modified diatomite / polyethylene composite plastic. Background technique [0002] Diatomite (Diatomite) is an aggregate formed by the deposition and accumulation of diatom biological remains (that is, diatom shells). The main inorganic component of the shell is amorphous silica and contains a small amount of Fe. 2 o 3 、Al 2 o 3 , CaO, MgO and organic impurities, the appearance is a soft powdery substance similar to chalk, which has the characteristics of light weight, fineness, looseness and porosity. Diatomaceous earth is abundant in my country, because diatom shells have many special properties such as high porosity, large specific surface area, strong heat resistance (≥1000°C), acid resistance, low bulk density and strong adsorption, and silicon The source of diatomaceous earth is abundant and the price is low, so diatomite has received ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K9/12C08K9/10C08K3/36
Inventor 文起东秦高梧贾迎钢胡建设李松任玉平
Owner YINGKOU DONGSHENG IND
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