CN1370795A - Pre-irradiation grafting technoogical process of preparing antifogging polyethylene film - Google Patents
Pre-irradiation grafting technoogical process of preparing antifogging polyethylene film Download PDFInfo
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- CN1370795A CN1370795A CN 01107184 CN01107184A CN1370795A CN 1370795 A CN1370795 A CN 1370795A CN 01107184 CN01107184 CN 01107184 CN 01107184 A CN01107184 A CN 01107184A CN 1370795 A CN1370795 A CN 1370795A
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Abstract
The present invention is the pre-irradiation grafting process of preparing anti-fogging polyethylene film. After polyethylene film is irradiated by gamma ray or electron beam, peroxide and oxo (C=O) group may be introduced to its molecular chain. Under case of being heated, these groups will produce oxygen containing free radical to initiate the grafting polymerization of polar monomer acrylic acid, acrylamide or methylacrylic acid in the surface of polyethylene film so as to form surface hydrophilic layer and reach permanent antifogging effect.
Description
The present invention relates to the method that a kind of pre-irradiation grafting technology prepares the polyethylene anti-fog thin film, belong to polymer processing field.
Polyethylene because of its abundant raw material, cheap, over-all properties is superior, consumption accounts for first of the general-purpose plastics always, at present world's polyethylene production is 4,568 ten thousand tons/year.China's polyethylene production in 1996 reaches 1,640,000 tons/year, and import volume is up to 2,370,000 tons, and apparent consumption is 3,990,000 tons.In the polyethylene products be maximum kind with the film, account for 67% of its total amount, wherein the farmland film accounts for 29%, and packing film accounts for 30%.Exploitation and and to use anti-fog thin film be one of effective way that improves crop yield, also can be used for food product pack etc. simultaneously improving the ornamental and added value of commodity, so the antifog problem of film has caused the common concern of countries in the world.With regard to agricultural film, the antifog plastic sheeting for farm use that the U.S., Japan, Korea S use accounts for 60%, 90%, 100% of total amount respectively.China is the country that the plastic sheeting for farm use consumption at most in the world, the zone is the widest, area coverage is maximum, but the research of anti-droplet plastic sheeting for farm use just began in recent years, and national rate of utilization is less than 10%, and antifog validity period only has 3～4 months, half a year at the most is well below abroad as 2 years antifog phases of japanese product.Therefore to have the film of long-acting anti-fog function be a job highly significant in research and extension, and economic and social benefit is huge.
Because polyethylene is non-polar molecular structure, has hydrophobicity, be difficult in use being soaked into by water, anti-fog performance is relatively poor.The method that present domestic and foreign literature report improves the polyethylene anti-fog performance generally is to adopt inner the adding or methods such as surface applied antifogging agent, surface light grafting, does not see that as yet electron beam or gamma-radiation pre-irradiation grafting are used to improve the report of polyethylene film anti-fog performance.
The objective of the invention is provides a kind of pre-irradiation grafting technology to prepare the method for polyethylene anti-fog thin film at the deficiencies in the prior art, be characterized in polyethylene film is carried out pre-irradiation, owing in the irradiation process, introduced superoxide and carbonyl (C=O) oxy radical on the sub polyethylene subchain, under the situation of being heated, generate free radical and cause the graft polymerization of polar monomer on the polyethylene film surface, make its surface form hydrophilic layer, the film that obtains having the permanent anti-fog effect.
Purpose of the present invention adopts following technical measures to realize, wherein said raw material umber all is weight percentage except that specified otherwise.
1. the pre-irradiation of polyethylene film
At room temperature in the air polyethylene film is carried out irradiation, irradiation dose is 10～100kGy, introduces superoxide and carbonyl (C=O) oxy radical on its molecular chain.
2. the graft polymerization of polyethylene film
The irradiated polyethylene film is placed the aqueous solution of 10～100% polar monomers; under nitrogen protection, reacted 1～8 hour in 60～100 ℃; the free radical that utilizes superoxide and oxy radical to generate in the back that is heated causes the graft polymerization of polar monomer; make film surface form hydrophilic layer, the polyethylene film that obtains having the permanent anti-fog effect.
Polar monomer is that vinylformic acid, methacrylic acid, MALEIC ANHYDRIDE and/or acrylamide are at least a.
Experimental result shows that the polyethylene film that this method makes has good anti-fog performance, sees table 1 for details.
The present invention has following advantage:
Technology is simple, can obtain having the polyethylene film of permanent anti-fog effect.
Embodiment:
Below by embodiment the present invention is specifically described; be necessary to be pointed out that at this following examples can only be used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment according to the content of the invention described above.
1. adopt JJ-2 type electrostatic accelerator, at room temperature in the air polyethylene film is carried out irradiation, irradiation dose is 80kGy.Then polyethylene film is placed 80% acrylamide solution, under nitrogen protection, carry out graft reaction, 1 hour reaction times in 80 ℃.
2. adopt right cylinder formula 50000 Ci
60Irradiation is at room temperature carried out to polyethylene film in the air in Co gamma-radiation source, and irradiation dose is 60kGy.Then polyethylene film is placed the 10% MALEIC ANHYDRIDE aqueous solution, under nitrogen protection, carry out graft reaction, 2 hours reaction times in 100 ℃.
3. adopt JJ-2 type electrostatic accelerator, at room temperature in the air polyethylene film is carried out irradiation, irradiation dose is 80kGy.Then polyethylene film is placed 50% methacrylic aqueous acid, under nitrogen protection, carry out graft reaction, 2 hours reaction times in 100 ℃.
4. adopt JJ-2 type electrostatic accelerator, at room temperature in the air polyethylene film is carried out irradiation, irradiation dose is 100kGy.Then polyethylene film is placed 50% acrylic acid aqueous solution, and add 2%FeSO
47H
2O carries out graft reaction, 2 hours reaction times in 100 ℃ under nitrogen protection.
The anti-fog performance of table 1 pre-irradiation grafting polyethylene film
| Sample number into spectrum | With the static contact angle of water (°) | Anti-fog performance ※ |
| Unmodified sample | 91 | Steam coagulation becomes fine mist, and film seriously atomizes, and transparency descends. |
| PE-1 | 71 | Droplet forms regional small pieces moisture film, and film clarity makes moderate progress, and the film anti-fog performance improves. |
| PE-2 | 65 | Droplet forms the continuity moisture film, and film clarity is obviously improved.After film tilted, water flowed down along film surface.Film has good anti-fog performance |
※The anti-fog performance testing method: add 60 ℃ hot water 400ml in the beaker of 500ml, will be verified film and cover on the rim of a cup, flattening is tightened, and observes droplet condense situation and film clarity after 45 minutes, beaker is tilted about 15 ° again, observes the situation of water droplet.
Claims (2)
1. a pre-irradiation grafting technology prepares the method for polyethylene anti-fog thin film, it is characterized in that:
A. the pre-irradiation of polyethylene film
At room temperature in the air polyethylene film is carried out irradiation, irradiation dose is 10～100kGy, at its molecular chain
Last introducing superoxide and carbonyl oxy radicals such as (C=O),
B. the graft polymerization of polyethylene film
The irradiated polyethylene film is placed the aqueous solution of 10～100% polar monomers, under nitrogen protection in 60～100
℃ reaction 1～8 hour, free radical that the back generates causes polar monomer to utilize superoxide and oxy radical to be heated
Graft polymerization, make film surface form hydrophilic layer, the polyethylene film that obtains having the permanent anti-fog effect.
2. prepare the method for polyethylene anti-fog thin film according to the described a kind of pre-irradiation grafting technology of claims, it is characterized in that polar monomer is that vinylformic acid, methacrylic acid, MALEIC ANHYDRIDE and/or acrylamide are at least a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011071842A CN1161400C (en) | 2001-02-26 | 2001-02-26 | Pre-irradiation grafting technoogical process of preparing antifogging polyethylene film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011071842A CN1161400C (en) | 2001-02-26 | 2001-02-26 | Pre-irradiation grafting technoogical process of preparing antifogging polyethylene film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1370795A true CN1370795A (en) | 2002-09-25 |
| CN1161400C CN1161400C (en) | 2004-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011071842A Expired - Fee Related CN1161400C (en) | 2001-02-26 | 2001-02-26 | Pre-irradiation grafting technoogical process of preparing antifogging polyethylene film |
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| CN (1) | CN1161400C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294189C (en) * | 2005-03-03 | 2007-01-10 | 北京化工大学 | Reaction liquid for modifying polymer film and modifying method |
| CN102051816A (en) * | 2010-11-19 | 2011-05-11 | 志向（中国）集团有限公司 | Manufacturing method of superabsorbent fabric |
| CN102399386A (en) * | 2010-09-15 | 2012-04-04 | 中国石油天然气股份有限公司 | Method for preparing silicon-containing polyethylene high-lubrication composite material |
| CN105111561A (en) * | 2015-08-27 | 2015-12-02 | 江苏蓝湾生物科技有限公司 | Preparation method of medical anti-atomization film |
| CN106867012A (en) * | 2015-12-14 | 2017-06-20 | 中国科学院上海应用物理研究所 | The method of electron beam pre-irradiation grafting modified PET film |
| CN111621240A (en) * | 2020-06-05 | 2020-09-04 | 中国科学院兰州化学物理研究所 | Polymer brush modified transparent anti-fog patch and preparation method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305939C (en) * | 2005-08-17 | 2007-03-21 | 威高集团有限公司 | Preparation method and uses of radiation modified polyolefinic thermoplastic elastomer blending resin |
| CN101780377B (en) * | 2010-03-09 | 2012-06-20 | 天津膜天膜工程技术有限公司 | Method for preparing compound nanofiltration membrane |
-
2001
- 2001-02-26 CN CNB011071842A patent/CN1161400C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294189C (en) * | 2005-03-03 | 2007-01-10 | 北京化工大学 | Reaction liquid for modifying polymer film and modifying method |
| CN102399386A (en) * | 2010-09-15 | 2012-04-04 | 中国石油天然气股份有限公司 | Method for preparing silicon-containing polyethylene high-lubrication composite material |
| CN102051816A (en) * | 2010-11-19 | 2011-05-11 | 志向（中国）集团有限公司 | Manufacturing method of superabsorbent fabric |
| CN105111561A (en) * | 2015-08-27 | 2015-12-02 | 江苏蓝湾生物科技有限公司 | Preparation method of medical anti-atomization film |
| CN106867012A (en) * | 2015-12-14 | 2017-06-20 | 中国科学院上海应用物理研究所 | The method of electron beam pre-irradiation grafting modified PET film |
| CN106867012B (en) * | 2015-12-14 | 2020-03-13 | 中国科学院上海应用物理研究所 | Method for modifying PET film by electron beam pre-irradiation grafting |
| CN111621240A (en) * | 2020-06-05 | 2020-09-04 | 中国科学院兰州化学物理研究所 | Polymer brush modified transparent anti-fog patch and preparation method thereof |
| CN111621240B (en) * | 2020-06-05 | 2021-03-16 | 中国科学院兰州化学物理研究所 | Polymer brush modified transparent anti-fog patch and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN1161400C (en) | 2004-08-11 |
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Free format text: CORRECT INVENTOR; FROM: XU XI; XU WEN; LIU PENGBO; LIAN TIEJUN; TO: XU; WEN; LIU PENGBO; LIAN TIEJUN Effective date: 20010727 |
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Effective date of registration: 20010727 Inventor after: Xu Wen Inventor after: Liu Pengbo Inventor after: Lian Tiejun Inventor before: Xu Xi Inventor before: Xu Wen Inventor before: Liu Pengbo Inventor before: Lian Tiejun |
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