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Polychloroethylene / layered double hydroxide nano composite material and preparation thereof

A technology of nanocomposite materials and layered hydroxides, which is applied in the field of polyvinyl chloride/layered double hydroxide nanocomposites, can solve problems such as difficulty in industrial scale-up, influence on polymerization process and mechanism, and complex preparation process , to achieve significant modification effect, improve composite effect, and simple process

Inactive Publication Date: 2009-01-28
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Monomer intercalation in-situ polymerization, polymer solution intercalation and melt intercalation are commonly used preparation methods for polymer / inorganic nanocomposites. Process and polymerization mechanism, industrial scale-up is difficult

Method used

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  • Polychloroethylene / layered double hydroxide nano composite material and preparation thereof
  • Polychloroethylene / layered double hydroxide nano composite material and preparation thereof
  • Polychloroethylene / layered double hydroxide nano composite material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, preparation polyvinyl chloride / layered double hydroxide nanocomposite material

[0030]Under nitrogen condition, slowly drip the aqueous solution containing 0.02mol magnesium nitrate and 0.01mol aluminum nitrate (Mg / Al=2) into 200ml aqueous solution containing 0.015mol sodium lauryl sulfate and 0.02mol sodium hydroxide by 50ml, Stir vigorously until the dropwise addition is complete. During the whole dropping process, use 1mol / L sodium hydroxide solution to adjust the pH value of the system to always be about 10, then raise the temperature to 80°C, keep the temperature constant for 6h, wash, filter, and vacuum dry for 24 hours to obtain Surface-modified LDHs.

[0031] Add 1 part of surface organically modified LDHs to cyclohexanone, and ultrasonically disperse for 30 minutes to obtain a stable dispersion with a concentration of 5 g / L; then add the obtained dispersion to a tetrahydrofuran solution in which 100 parts of PVC are completely dissolved, The con...

Embodiment 2

[0033] Embodiment 2, preparation polyvinyl chloride / layered double hydroxide nanocomposite material

[0034] Under nitrogen, slowly drop 50ml of an aqueous solution containing 0.06mol magnesium nitrate and 0.02mol aluminum nitrate (Mg / Al=3) into 200ml of an aqueous solution containing 0.03mol sodium dodecylsulfonate and 0.06mol potassium hydroxide , vigorously stirred until the dropwise addition is complete, the pH value of the system is always adjusted to about 10 with 1mol / L sodium hydroxide solution during the whole dropwise addition process, and then the temperature is raised to 70°C, kept at a constant temperature for 12h, washed, filtered, and vacuum-dried for 36 hours to obtain Surface-modified LDHs.

[0035] Add 3 parts of surface organically modified LDHs to methyl phthalate, and disperse at high speed for 5 minutes to obtain a stable dispersion with a concentration of 10 g / L; then add the resulting dispersion to completely dissolve 100 parts of PVC In the tetrahydro...

Embodiment 3

[0037] Embodiment 3, preparation polyvinyl chloride / layered double hydroxide nanocomposite material

[0038] Under nitrogen, slowly drop 50ml of an aqueous solution containing 0.04mol magnesium nitrate and 0.01mol aluminum nitrate (Mg / Al=4) into 200ml of an aqueous solution containing 0.02mol sodium stearate and 0.04mol potassium hydroxide, and stir vigorously Until the dropwise addition is complete, use 1mol / L sodium hydroxide solution to adjust the pH value of the system to always be about 10 during the whole dropping process, then raise the temperature to 75°C, keep the temperature constant for 9h, wash, filter, and vacuum dry for 30 hours to obtain surface modification LDHs.

[0039] Add 5 parts of surface organically modified LDHs to chlorobenzene, and ultrasonically disperse for 60 minutes to obtain a stable dispersion with a concentration of 15 g / L; then add the obtained dispersion to a tetrahydrofuran solution in which 100 parts of PVC are completely dissolved, and tet...

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Abstract

The invention provides a polyvinyl chloride / layered double hydroxide nano-composite material and a preparation method thereof. The composite material is compounded by polyvinyl chloride and layered hydroxide with the molecular formula of [Mg1-xAlx (OH) 2] question mark R. The preparation method of the material comprises the following steps: 1) the water solution of magnesium nitrate and aluminum nitrate is reacted with the water solution of organic salt and strong base; the temperature is then raised to 70 to 80 DEG C for constant temperature reaction, and layered double hydroxide with modified surface is obtained; and 2) the layered double hydroxide with modified surface reacts with polyvinyl chloride and the product is obtained. The preparation method of the invention has simple process and obvious modification effect; the polyvinyl chloride / layered double hydroxide nano-composite material LDHs obtained by using the method can scatter in a PVC matrix by nanometer scale with obviously improved thermal stability without poison and heavy metals such as lead, etc., environment-friendly, can be directly used for producing various PVC products without adding heat stabilizer and has high application value.

Description

technical field [0001] The invention relates to a polyvinyl chloride nanocomposite material, in particular to a polyvinyl chloride / layered double hydroxide nanocomposite material. Background technique [0002] Polyvinyl chloride (PVC) has the advantages of low price, excellent comprehensive performance and variety of varieties (including hard, soft and paste products, etc.), and has a wide range of applications in the fields of chemical industry, building materials, transportation, electrical insulation and packaging materials. Applications. However, during the processing and use of PVC itself, it is easy to degrade, remove hydrogen chloride and cross-link, which deteriorates the processing performance of PVC, and the main chain forms conjugated double bonds, which causes the polymer to change color, resulting in a decline in product performance. Therefore, heat stabilizers must be added during the processing of PVC. Now commonly used heat stabilizers mainly include lead s...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08K9/04C08J3/20
Inventor 陈光明刘军杨继萍
Owner INST OF CHEM CHINESE ACAD OF SCI
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