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Conductive thermoplastic powder, preparation and uses thereof

A thermoplastic and powder technology, applied in powder coatings, conductive coatings, coatings, etc., can solve the problems of powder coating, limited use conditions, and great difference in strength, so as to reduce investment, reduce processing energy consumption, and prolong The effect of age

Active Publication Date: 2009-04-08
GUANGZHOU LUSHAN NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to prevent the gas explosion caused by static electricity, the pipes used in coal mines are required to have electrical conductivity. At present, the pipes used in coal mines generally use metal pipes or conductive plastic extruded pipes. Pure metal pipes have the advantages of conductivity and high strength, while conductive plastic pipes are It has many advantages such as electrical conductivity, long service life and easy installation, but its strength is far from that of metal pipes
[0003] Existing a lot of reports for antistatic plastics, as the antistatic plastics involved in CN14118907A and CN1114607A is to adopt antistatic agent to modify polyethylene, but it is subjected to the limitation of service conditions, and antistatic effect is better under humid environment
The antistatic polyethylene designed by the publication number CN1616531A adopts two kinds of conductive carbon blacks with different specific surface areas to modify polyethylene, which expands its application range, but the purposes involved are all used to extrude pipes, and cannot for powder coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The preparation method comprises the following sequential steps:

[0030] (1) Formula and preparation of conductive masterbatch:

[0031] The formula (calculated by weight percentage): 73-83% of low-density polyethylene, 15-25% of special conductive carbon black, and 2-4% of treatment agent.

[0032] The special conductive carbon black, the treatment agent and the low-density polyethylene are thoroughly mixed in a mixer, and then granulated by a twin-screw extruder to prepare a conductive masterbatch.

[0033] (2) Formula and preparation of grafted bonding masterbatch:

[0034] Formula (calculated by weight percentage): low-density polyethylene 92-95%, polyvinyl acetate (EVA) 3-6%, unsaturated graft monomer (such as maleic anhydride) 1.2-1.5%, styrene (St) 0-1.5%, initiator (DCP) 0.04-0.06%.

[0035] Uniformly mixing unsaturated grafting monomers with low-density polyethylene, then mixing them with EVA and an initiator, adding them into a twin-screw extruder for graf...

Embodiment 1

[0042] Composition formula (calculated in parts by weight): 23 parts of conductive masterbatch, 10 parts of grafted bonding masterbatch and 64 parts of other compounding additives (wherein, 52 parts of linear low density polyethylene, 10 parts of polyvinyl acetate (EVA) , leveling agent 2 parts)

[0043] Among them, calculated by weight percentage,

[0044] The formula of conductive masterbatch is: linear low density polyethylene 71%, conductive carbon black 25%, titanate coupling agent 4%;

[0045] The formula of the graft bonding masterbatch is: 93.5% of low-density polyethylene, 5% of polyvinyl acetate (EVA), 1.5% of maleic anhydride, and 0.05% of initiator (DCP).

[0046] Preparation:

[0047]Preparation of conductive masterbatch: First, add low-density polyethylene to a high-speed mixer at 500-1000rpm, add a treatment agent (such as titanate coupling agent), and stir at room temperature for 5-10 minutes; then add special conductive carbon black in the mixer Co-blending...

Embodiment 2

[0051] Composition formula (calculated in parts by weight): 22 parts of conductive masterbatch, 15 parts of grafted bonding masterbatch and 66 parts of other compounding additives (wherein, 49 parts of linear low density polyethylene, 13 parts of polyvinyl acetate (EVA) , leveling agent 4 parts).

[0052] Wherein the formula of conductive masterbatch is identical with embodiment 1.

[0053] Wherein the formula of graft masterbatch is (calculated by weight percentage):

[0054] Low-density polyethylene 91%, polyvinyl acetate (EVA) 6%, maleic anhydride 1.5%

[0055] Styrene (St) 1.5%, Initiator (DCP) 0.05%.

[0056] The preparation method is the same as in Example 1.

[0057] The detection data of embodiment 1,2 gained product is as following table.

[0058] Example

[0059] .

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PUM

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Abstract

The invention discloses a conductive thermoplastic powder which comprises the following components counted in weight portions: 20 to 25 portions of conductive master batch, 10 to 15 portions of grafting sticky master batch and 47 to 74 portions of accessory ingredient. In the invention, specific conductive carbon black and polyethylene powder are uniformly mixed by a high mixer and are pelletized by a double screw extruder for standby; the prepared grain material and other compounds are pelletized by the double screw extruder and ground into powder; and the prepared conductive thermoplastic powder improves the MFR of a composite, has better flatting performance, can reduce the processing energy consumption and has an excellent adhesive attraction under the situation of ensuring high sticking intensity. The conductive thermoplastic powder can be used for coating the surface of metal pipes, combines the advantages of plastic with metal pipe organically, can be applied to the underground environment of coal ores, prolongs the service life of the pipes and simultaneously does not reduce the intensity of the pipes and reduces the investment on the coal ore enterprises.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a conductive thermoplastic powder and its preparation method and application. technical background [0002] In recent years, powder coating has been developed at a high speed due to its unique advantages. The powder coating has no solvent release, which meets the requirements of environmental protection; the utilization rate reaches 95%, and the powder particles lost during the construction of the powder coating can be recycled and reused, saving resources; the physical and mechanical properties of the powder coating film and chemical resistance The medium performance is superior, and the thickness of the powder coating film can be controlled to 50-500um, which is difficult to achieve by other solvent-based coatings; powder coatings also have the advantages of convenient construction, easy realization of automated assembly lines, and improved productivity; polyethylene powder coati...

Claims

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Application Information

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IPC IPC(8): C09D123/06C09D151/06C09D5/03C09D5/24
Inventor 陈占春王大伟汪加胜唐舫成范德辉朱东湖
Owner GUANGZHOU LUSHAN NEW MATERIALS
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