Anti-fog polyolefin graft copolymer and preparation method thereof

A technology of polyolefin grafts and grafts, which is applied in the field of polyolefin grafts and their preparation, can solve the problems of poor compatibility between anti-fog agents and polyolefins, and the decline in anti-fog effects, and achieve long-term anti-fog Fog effect, not easy to lose effect

Inactive Publication Date: 2017-05-10
GUANGZHOU LUSHAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor compatibility of antifogging agents and polyolefins, this method cannot avoid the migration and precipitation of small molecule antifogging agents from the inside of the resin.
Although the small-molecule anti-fogging agent is further fixed by adding porous adsorption materials in the later stage to reduce its precipitation and loss, such as the methods disclosed in patents CN201210250277.0 and CN201210250242.7, the problem has not been essentially solved, especially in the rainy season. , the anti-fog effect drops faster

Method used

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  • Anti-fog polyolefin graft copolymer and preparation method thereof
  • Anti-fog polyolefin graft copolymer and preparation method thereof
  • Anti-fog polyolefin graft copolymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of preparation method of anti-fog polyolefin graft, it is prepared by two-step grafting method, specifically comprises the following steps:

[0031] Grafting step 1: 100 parts of linear low density polyethylene (density 0.92g / cm 3 ; Melt index 1g / 10min (190°C, 2.16kg)), 0.05 parts of 2,5-dimethyl-2,5-bis(tert-butyl peroxy)hexane and 1 part of maleic anhydride were added to the mixer, Stirring speed 1000r / min, mixing 5min. Put the uniformly mixed materials into a φ65 twin-screw extruder with a screw length-to-diameter ratio of 36:1, a grafting temperature of 180°C, and a screw speed of 300 rpm. Extrude and granulate to obtain polar monomer graft A.

[0032] Grafting step 2: Add 100 parts of polar monomer graft A, 30 parts of polyethylene glycol (molecular weight 20,000) and 0.1 part of antioxidant B215 into the mixer, and mix for 5 minutes at a stirring speed of 1000 r / min. Put the uniformly mixed materials into a φ65 twin-screw extruder with a screw length-to-...

Embodiment 2

[0034] A kind of preparation method of anti-fog polyolefin graft, it is prepared by two-step grafting method, specifically comprises the following steps:

[0035] Grafting step 1: 100 parts of random copolymerized polypropylene (density 0.90g / cm 3; melt index 2g / 10min (230°C, 2.16kg)), 0.1 parts of 2,5-dimethyl-2,5-bis(tert-butyl peroxy)hexane, 0.1 parts of di-tert-butyl peroxide and Add 2 parts of maleic anhydride and 1 part of styrene into the mixer, stir at a speed of 1000r / min, and mix for 5 minutes. Put the uniformly mixed materials into a φ65 twin-screw extruder with a screw length-to-diameter ratio of 36:1, a grafting temperature of 200°C, and a screw speed of 200 rpm. Extrude and granulate to obtain polar monomer graft A.

[0036] Grafting step 2: 100 parts of polar monomer graft A, 20 parts of polyethylene glycol (molecular weight 30000), 0.05 part of antioxidant 1010, 0.05 part of antioxidant 168 and 0.01 part of 2-(2-hydroxy Add -3,5-di-tert-butylphenyl)-5-chloro...

Embodiment 3

[0038] A kind of preparation method of anti-fog polyolefin graft, it is prepared by two-step grafting method, specifically comprises the following steps:

[0039] Grafting step 1: 100 parts of impact copolymerized polypropylene (density 0.91g / cm3; melt index 1.8g / 10min (230°C, 2.16kg)), 1.5 parts of 2,5-dimethyl-2,5-di Add (tert-butyl peroxy)hexane, 5 parts of maleic acid, 5 parts of maleic anhydride and 0.5 part of triallyl isocyanurate into the mixer, stir at a speed of 1000 r / min, and mix for 5 minutes. Put the uniformly mixed materials into a φ65 twin-screw extruder with a screw length-to-diameter ratio of 32:1, a grafting temperature of 190°C, and a screw speed of 200 rpm. Extrude and granulate to obtain polar monomer graft A.

[0040] Grafting step 2: 100 parts of polar monomer graft A, 30 parts of polyvinyl alcohol (molecular weight 10000), 1 part of 4-dimethylaminopyridine, 0.5 part of antioxidant B215 and 0.5 part of 2-hydroxy-4 - Add n-octyloxybenzophenone into the...

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Abstract

The invention discloses an anti-fog polyolefin graft copolymer and a preparation method thereof. The anti-fog polyolefin graft copolymer is prepared through a two-step grafting method. The method specifically comprises the following steps: (1) carrying out grafting reaction on polyolefin, a peroxide initiator and a polar monomer to obtain a polar monomer graft copolymer A; and (2) further grafting hydrophilic macromolecules into the polar monomer graft copolymer A through the action of a chemical bond to obtain the anti-fog polyolefin graft copolymer B. The anti-fog polyolefin graft copolymer has excellent hydrophilic performance, is not easy to run off due to rainwash and has a more lasting anti-fog effect.

Description

technical field [0001] The invention relates to an anti-fog polyolefin graft, in particular to a polyolefin graft with good anti-fog performance and a preparation method thereof. Background technique [0002] Polyolefin has good cold resistance, mechanical properties, chemical stability and easy processing, and is widely used in various plastic products. At the same time, polyolefin is also a kind of hydrophobic resin. When it is used as a plastic film, such as a plastic greenhouse film, it is easy to fog on the film when there is a large difference between indoor and outdoor temperature and humidity. The reason is that the surface tension of the film is quite different from that of water, and the supersaturated water vapor in the air will condense into a large number of water droplets on the surface of the film. The existence of fog droplets will affect the transparency of the film, thereby affecting the photosynthesis of greenhouse crops, and ultimately leading to a decli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G83/00C08F255/02C08F222/06C08F222/02C08F220/06
CPCC08F255/02C08F255/026C08G81/021C08G81/025C08G83/001C08F222/06C08F222/02C08F220/06
Inventor 刘嘉贤王明辉李煦田余鹏唐舫成汪加胜
Owner GUANGZHOU LUSHAN NEW MATERIALS
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