CN102161797A - Modified linear low-density polyethylene composite material and preparation method thereof - Google Patents
Modified linear low-density polyethylene composite material and preparation method thereof Download PDFInfo
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- CN102161797A CN102161797A CN 201110144432 CN201110144432A CN102161797A CN 102161797 A CN102161797 A CN 102161797A CN 201110144432 CN201110144432 CN 201110144432 CN 201110144432 A CN201110144432 A CN 201110144432A CN 102161797 A CN102161797 A CN 102161797A
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Abstract
The invention discloses a modified high-density polyethylene composite material and a preparation method thereof. The composite material is prepared from the following raw material in part by weight: 30 to 50 parts of corn starch, 20 to 60 parts of linear low-density polyethylene composite material, 5 to 15 parts of inorganic filler, and 5 to 25 parts of plasticizer. The preparation method comprises: adding the corn starch and plasticizer into a high-speed mixer, mixing for 10 to 25 minutes, adding the inorganic filler and the linear low-density polyethylene, and mixing for 10 to 25 minutes; and extruding the obtained mixture in a double-screw extruder for granulation. The modified high-density polyethylene composite material disclosed by the invention is biodegradable, can reduce environment pollution, and has high water resistance, dimension stability and good mechanical properties. The manufacturing cost of the modified high-density polyethylene composite material is low, and the modified high-density polyethylene composite material is particularly suitable for food packages.
Description
Technical field
The present invention relates to a kind of linear low density polyethylene matrix material and preparation method thereof, especially relate to a kind of modification linear low density polyethylene matrix material and preparation method thereof.
Background technology
The development and use of macromolecular material bring greatly easily simultaneously to the mankind, also bring a lot of negative impacts to the mankind, as the linear low density polyethylene plastic packaging bags that use in a large number at present,, caused serious " white pollution " owing in physical environment, be difficult to degraded.Starch is natural macromolecular material, can be decomposed by microbial process under physical environment, finally is decomposed into nontoxic CO
2And H
2O, and abundant raw material, cheap have been widely used in the research of biodegradable material.But starch molecular chain contains great amount of hydroxy group, forms hydrogen bond easily in molecular chain He outside the molecular chain, so indissoluble, infusibility, and poor water resistance, chance water or long-term storage are in wet environment, absorb moisture easily, its stability decreases, the quality and the effect of influence packing.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, provides a kind of water tolerance, dimensional stability and mechanical property good, and biodegradable, modification linear low density polyethylene matrix material of low cost of manufacture and preparation method thereof.
The present invention solve the technical problem the technical scheme that is adopted:
The present invention's modification linear low density polyethylene matrix material is made by the raw material of following parts by weight: W-Gum 30-50 part, linear low density polyethylene (LLDPE) 20-60 part, mineral filler 5-15 part, softening agent 5-25 part;
Preferred weight proportion is: 45 parts of W-Gums, 40 parts of linear low density polyethylenes (LLDPE), 5 parts of mineral fillers, 10 parts in softening agent;
The preferred sodium stearate of described softening agent;
Described mineral filler preferably calcium sulfate.
The preparation method of the present invention's modification linear low density polyethylene matrix material may further comprise the steps:
(1) W-Gum, softening agent are added in the high-speed mixer, mix the preferred 20min of 10-25min(), add mineral filler, linear low density polyethylene again, the preferred 20min of mixing 10-25min(), get the mixture of W-Gum, softening agent, mineral filler and linear low density polyethylene;
(2) step (1) gained mixture is passed through the twin screw extruder extruding pelletization, head temperature is 90-140 ℃ (preferred 100 ℃), and screw speed is the preferred 110r/min of 100-120r/min().
The present invention's modification linear low density polyethylene matrix material, the linear low density polyethylene that is adopted at high temperature melt-processable is good, has good mechanical stability, therefore can be used as tackiness agent and toughener, effectively promote uniform mixing and bonding between the W-Gum, improve mechanical property, water tolerance and the dimensional stability of material.Preferred mineral filler calcium sulfate, low price, the chemical property torpescence, have chemical proofing and electrical insulating property, so stability, rigidity and the hardness that can regulate material on the one hand, the mechanical property and the thermotolerance of raising material, in addition on the one hand, can improve the water tolerance and the outward appearance whiteness of material, and reduce cost widely.W-Gum is biodegradable, aboundresources, cheap, have mechanical property preferably, but because starch molecular chain contains great amount of hydroxy group, in molecular chain He outside the molecular chain, form hydrogen bond easily, indissoluble, infusibility, therefore add softening agent, the ester group of preferred plasticizer sodium stearate can form hydrogen bond with the hydroxyl in the starch, thereby destroys between starch molecule and intramolecular hydrogen bond, plays the plastifying effect.
The present invention's modification linear low density polyethylene matrix material, biodegradable, can reduce pollution to environment, have excellent water tolerance, dimensional stability and good mechanical performance, low cost of manufacture.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1
Present embodiment raw material weight proportioning: W-Gum 6Kg, LLDPE 12 Kg, calcium sulfate 1 Kg, sodium stearate 1 Kg.
(1) W-Gum, softening agent sodium stearate are added in the high-speed mixer, mix 20min, add mineral filler calcium sulfate, linear low density polyethylene again, mix 20min, get the mixture of W-Gum, softening agent sodium stearate, mineral filler calcium sulfate and linear low density polyethylene;
(2) step (1) gained mixture is passed through the twin screw extruder extruding pelletization, head temperature is 90 ℃, and screw speed is 100r/min.
The present embodiment product performance detect, tensile strength is undertaken by GB/T12914 one 2008 prescriptive procedures, elongation at break is undertaken by GB/T12914 one 2008 prescriptive procedures, the evaluation of material degradation performance adopts soil to bury the biological degradation experiment, and (this biological degradation experiment adopts fairly simple indoor soil to bury method, 5 ℃ of envrionment temperature 18 scholars, used soil is common outdoor soil, and degradation experiment begins the back and added a certain amount of water every 10 days, keeps moist.After 30 days, take out sample at interval, rinse out surperficial earth and be put in 50 ℃ of baking ovens and dried 24 hours, calculate rate of weight loss then), its experimental result is as shown in table 1.
Embodiment 2
Present embodiment raw material weight proportioning: W-Gum 8Kg, LLDPE8 Kg, calcium sulfate 2 Kg, sodium stearate 2Kg.
(1) W-Gum, softening agent sodium stearate are added in the high-speed mixer, mix 20min, add mineral filler calcium sulfate, linear low density polyethylene again, mix 20min, get the mixture of W-Gum, softening agent sodium stearate, mineral filler calcium sulfate and linear low density polyethylene;
(2) step (1) gained mixture is passed through the twin screw extruder extruding pelletization, head temperature is 100 ℃, and screw speed is 110r/min.
The present embodiment product performance detect, tensile strength is undertaken by GB/T12914 one 2008 prescriptive procedures, elongation at break is undertaken by GB/T12914 one 2008 prescriptive procedures, the evaluation of material degradation performance adopts soil to bury the biological degradation experiment, and (this biological degradation experiment adopts fairly simple indoor soil to bury method, 5 ℃ of envrionment temperature 18 scholars, used soil is common outdoor soil, and degradation experiment begins the back and added a certain amount of water every 10 days, keeps moist.After 30 days, take out sample at interval, rinse out surperficial earth and be put in 50 ℃ of baking ovens and dried 24 hours, calculate rate of weight loss then), its experimental result is as shown in table 1.
Embodiment 3
Present embodiment raw material weight proportioning: W-Gum 9Kg, LLDPE 8 Kg, calcium sulfate 1 Kg, sodium stearate 2 Kg.
(1) W-Gum, softening agent sodium stearate are added in the high-speed mixer, mix 20min, add mineral filler calcium sulfate, linear low density polyethylene again, mix 20min, get the mixture of W-Gum, softening agent sodium stearate, mineral filler calcium sulfate and linear low density polyethylene;
(2) step (1) gained mixture is passed through the twin screw extruder extruding pelletization, head temperature is 120 ℃, and screw speed is 120r/min.
The present embodiment product performance detect, tensile strength is undertaken by GB/T12914 one 2008 prescriptive procedures, elongation at break is undertaken by GB/T12914 one 2008 prescriptive procedures, the evaluation of material degradation performance adopts soil to bury the biological degradation experiment, and (this biological degradation experiment adopts fairly simple indoor soil to bury method, 5 ℃ of envrionment temperature 18 scholars, used soil is common outdoor soil, and degradation experiment begins the back and added a certain amount of water every 10 days, keeps moist.After 30 days, take out sample at interval, rinse out surperficial earth and be put in 50 ℃ of baking ovens and dried 24 hours, calculate rate of weight loss then), its experimental result is as shown in table 1.
Table 1 embodiment 1-3 product performance detected result relatively
| ? | Tensile strength MPa | Elongation at break % | Rate of weight loss % |
| Embodiment 1 | 15.8 | 60.8 | 28.5 |
| Embodiment 2 | 14.8 | 58.5 | 42.3 |
| Embodiment 3 | 14.1 | 57.3 | 51.6 |
| LLDPE | 13.8 | 56.0 | No change almost |
Claims (6)
1. a modification linear low density polyethylene matrix material is characterized in that, is made by the raw material of following parts by weight: W-Gum 30-50 part, linear low density polyethylene 20-60 part, mineral filler 5-15 part, softening agent 5-25 part.
2. modification linear low density polyethylene matrix material according to claim 1 is characterized in that, is made by the raw material of following parts by weight: 45 parts of W-Gums, 40 parts of linear low density polyethylenes, 5 parts of mineral fillers, 10 parts in softening agent.
3. modification linear low density polyethylene matrix material according to claim 1 and 2 is characterized in that described softening agent is a sodium stearate.
4. modification linear low density polyethylene matrix material according to claim 1 and 2 is characterized in that described mineral filler is a calcium sulfate.
5. the preparation method of a modification linear low density polyethylene matrix material as claimed in claim 1 or 2 is characterized in that, may further comprise the steps:
(1) W-Gum, softening agent are added in the high-speed mixer, mix 10-25min, add mineral filler, linear low density polyethylene again, mix 10-25min, get the mixture of W-Gum, softening agent, mineral filler and linear low density polyethylene;
(2) step (1) gained mixture is passed through the twin screw extruder extruding pelletization, head temperature is 90-140 ℃, and screw speed is 100-120r/min.
6. the preparation method of modification linear low density polyethylene matrix material according to claim 5 is characterized in that, may further comprise the steps:
(1) W-Gum, softening agent are added in the high-speed mixer, mix 20min, add mineral filler, linear low density polyethylene again, mix 20min, get the mixture of W-Gum, softening agent, mineral filler and linear low density polyethylene;
(2) step (1) gained mixture is passed through the twin screw extruder extruding pelletization, head temperature is 100 ℃, and screw speed is 110r/min.
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| CN2011101444326A CN102161797B (en) | 2011-05-31 | 2011-05-31 | Modified linear low-density polyethylene composite material and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104945682A (en) * | 2015-06-26 | 2015-09-30 | 苏州云舒新材料科技有限公司 | Thermoplastic starch based mulching film composite material and method for preparing the same |
| CN110804217A (en) * | 2019-12-10 | 2020-02-18 | 湖南工业大学 | High-filling starch masterbatch and preparation method thereof |
| CN110804216A (en) * | 2019-11-29 | 2020-02-18 | 湖南工业大学 | Film-grade starch-based composite material and preparation method thereof |
| CN111057274A (en) * | 2019-11-29 | 2020-04-24 | 湖南工业大学 | High-filling starch-based thermoplastic composite material and preparation method thereof |
| CN112062987A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
| CN112063055A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
| CN114106418A (en) * | 2020-08-27 | 2022-03-01 | 上海昶法新材料有限公司 | Plasticized starch, bio-based plastic, raw material composition thereof, preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104945682A (en) * | 2015-06-26 | 2015-09-30 | 苏州云舒新材料科技有限公司 | Thermoplastic starch based mulching film composite material and method for preparing the same |
| CN110804216A (en) * | 2019-11-29 | 2020-02-18 | 湖南工业大学 | Film-grade starch-based composite material and preparation method thereof |
| CN111057274A (en) * | 2019-11-29 | 2020-04-24 | 湖南工业大学 | High-filling starch-based thermoplastic composite material and preparation method thereof |
| CN110804217A (en) * | 2019-12-10 | 2020-02-18 | 湖南工业大学 | High-filling starch masterbatch and preparation method thereof |
| CN112062987A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
| CN112063055A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
| CN114106418A (en) * | 2020-08-27 | 2022-03-01 | 上海昶法新材料有限公司 | Plasticized starch, bio-based plastic, raw material composition thereof, preparation method and application |
| CN114106418B (en) * | 2020-08-27 | 2023-05-30 | 上海昶法新材料有限公司 | Plasticized starch, bio-based plastic and raw material composition, preparation method and application thereof |
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| CN102161797B (en) | 2012-07-11 |
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