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Degradable biaxially stretching polylactic acid cigarette film and preparation method thereof

A technology of biaxial stretching and polylactic acid, applied in the field of degradable biaxially stretched polylactic acid cigarette film and its preparation, can solve the problems of waste of resources, environmental pollution, and non-degradable polypropylene materials, etc., to reduce pollution and reduce surface pollution Effect

Pending Publication Date: 2021-05-28
HUBEI FIRSTA MATERIALS SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the cigarette film on the market is basically made of biaxially stretched polypropylene material, but polypropylene material cannot be degraded in a short time, and long-term use of polypropylene material to prepare cigarette film will cause waste of resources and environmental pollution

Method used

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  • Degradable biaxially stretching polylactic acid cigarette film and preparation method thereof
  • Degradable biaxially stretching polylactic acid cigarette film and preparation method thereof
  • Degradable biaxially stretching polylactic acid cigarette film and preparation method thereof

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preparation example Construction

[0045] The present invention also provides a method for preparing the degradable biaxially oriented polylactic acid cigarette film, comprising the following steps:

[0046] 1) extruding and melting the raw material mixture of each layer respectively to obtain the melt of each layer;

[0047] 2) extruding the melts of each layer to obtain a sheet;

[0048] 3) longitudinally stretching and transversely stretching the sheet to obtain a film;

[0049] 4) Stretching, winding, and aging treatment are performed on the film in sequence to obtain a degradable biaxially oriented polylactic acid cigarette film.

[0050] The extrusion melting temperature of the raw material mixture of the first functional layer in step 1) of the present invention is preferably 140-200°C, more preferably 150-180°C, more preferably 160-170°C; the raw material mixture of the second functional layer and the second functional layer The extrusion melting temperature of the raw material mixture of the three fu...

Embodiment 1

[0064] In the raw material mixture of the first functional layer, the weight ratio of copolymerized heat-sealable polylactic acid, erucamide, ethylene bisstearamide and silicon dioxide is 95:2:2:1; in the raw material mixture of the second functional layer , the weight ratio of polylactic acid and alkyl betaine is 97:3; in the raw material mixture of the third functional layer, the weight ratio of polylactic acid and alkyl betaine is 97:3; in the raw material mixture of core layer, polylactic acid, The weight ratio of oxazoline, nano-calcium carbonate and talc is preferably 91.5:3:5:0.5; in the raw material mixture of the fourth functional layer, the weight ratio of copolymerized heat-sealable polylactic acid and silicon dioxide is preferably 98:2 .

[0065] Extrude and melt 6kg of the raw material mixture of the first functional layer in the auxiliary machine No. 1 twin-screw extruder, the extrusion melting temperature is 150°C, 6kg of the raw material mixture of the second f...

Embodiment 2

[0067] In the raw material mixture of the first functional layer, the weight ratio of copolymerized heat-sealable polylactic acid, oleic acid amide, ethylene bisstearamide and silicon dioxide is 97.5:1:1:0.5; in the raw material mixture of the second functional layer The weight ratio of polylactic acid and sodium alkylsulfonate is 99:1; in the raw material mixture of the third functional layer, the weight ratio of polylactic acid and sodium alkylsulfonate is 99:1; in the raw material mixture of the core layer, poly The weight ratio of lactic acid, oxazoline, nano-calcium carbonate and layered sodium silicate is preferably 97.2:0.5:2:0.3; in the raw material mixture of the fourth functional layer, the weight ratio of copolymerized heat-sealable polylactic acid and talcum powder is preferably It is 99.5:0.5.

[0068] Extrude and melt 9kg of the raw material mixture of the first functional layer in auxiliary machine No. 1 twin-screw extruder, the temperature of extrusion melting ...

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Abstract

The invention belongs to the technical field of cigarette films. The invention provides a degradable biaxially stretching polylactic acid cigarette film. The degradablebiaxially stretching polylactic acid cigarette film comprises a first functional layer, a second functional layer, a core layer, a third functional layer and a fourth functional layer which are sequentially arranged in a contact manner, the weight ratio of the first functional layer to the second functional layer to the core layer to the third functional layer to the fourth functional layer is (5-10): (5-10): (60-80): (5-10): (5-10); the first functional layer comprises the following components in parts by weight: 95 to 97.5 parts of copolymerized heat-sealable polylactic acid; 1 to 2 parts of erucyl amide or oleamide; 1 to 2 parts of ethylene bis stearamide; and 0.5 to 1 part of silicon dioxide. The invention also provides a preparation method of the degradable biaxially stretching polylactic acid cigarette film. The polylactic acid smoke film can be completely degraded and has an antibacterial function; and the transparency, the heat sealing strength, the elastic modulus and the shrinkage rate are the same as those of a polypropylene smoke film.

Description

technical field [0001] The invention relates to the technical field of cigarette films, in particular to a degradable biaxially stretched polylactic acid cigarette film and a preparation method thereof. Background technique [0002] At present, the cigarette film on the market is basically made of biaxially stretched polypropylene material, but polypropylene material cannot be degraded in a short time, and long-term use of polypropylene material to prepare cigarette film will cause waste of resources and environmental pollution. [0003] Polylactic acid, also known as polylactide, is polymerized with lactic acid as the main raw material, and can be completely degraded into H in 4 to 6 months in the soil. 2 O.CO 2 And inorganic salts are ideal green polymer materials. Moreover, the source of raw materials of polylactic acid is sufficient and renewable, and the production process is pollution-free. [0004] Therefore, research and development of a degradable cigarette film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/06B32B27/18B32B37/10B32B38/00C08K3/36C08K5/20C08L67/04
CPCB32B27/36B32B27/08B32B27/18B32B37/10B32B38/0012C08K3/36C08K5/20B32B2038/0028B32B2307/716B32B2307/7145B32B2553/00C08K2201/014C08L67/04
Inventor 江四华陈德超张东平陈志军肖建军胡必刚
Owner HUBEI FIRSTA MATERIALS SCI & TECH GRP
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