CN100509383C - Cast polypropylene film with low heat-sealing temperature and high heat-sealing strength - Google Patents

Abstract

The invention discloses a doctor-blade polypropylene film with low-heat sealing temperature and high-packing strength, which comprises the following parts: corona disposing layer, intermittent layer and heat packing layer, wherein the corona disposing layer is made of isostatic homopolymer polypropylene or copolymerization polypropylene, the intermittent layer is made of isostatic homopolymer polypropylene with slip agent, the heat packing layer is composed of polypropylene copolymer with antisticking agent and slip agent.

Description

Cast polypropylene film with low heat-sealing temperature and high heat-sealing strength

Technical field

The present invention relates to a kind of printing, compound, packaging field of being used for, specifically is a kind of cast polypropylene film with low heat-sealing temperature and high heat-sealing strength.

Background technology

Because common polypropylene film adopts COPP to do hot sealing layer, though the kind difference of COPP, it is low that the heat-sealing temperature of film also has height to have, and the poly heat-sealing temperature that is far from is low.If just simply select for use polyethylene to do hot sealing layer, the film of producing can produce lamination, and interlaminar strength does not reach requirement.

Summary of the invention

The objective of the invention is to avoid polyethylene can reduce heat-sealing temperature, but can produce the deficiency of lamination and provide a kind ofly can reduce heat-sealing temperature and can not produce the cast polypropylene film of lamination.

Technical scheme of the present invention is as follows:

Have the cast polypropylene film of low heat-sealing temperature and high heat-sealing strength, include corona processing layer, the intermediate layer, hot sealing layer is characterized in that described corona layer, is made up of the isotactic HOPP or the COPP that contain antitack agent; The intermediate layer is made up of the isotactic HOPP that contains slipping agent; Hot sealing layer is made up of the polypropylene copolymer that contains antitack agent and slipping agent.

The kind of described polypropylene copolymer has: propylene-ethylene copolymers, propene-1-butene copolymer, propylene-octene copolymer, propylene-ethylene-butene trimer or propylene-ethylene-octene trimer.

In the hot sealing layer, polypropylene copolymer accounts for 95%-98%, and antitack agent and slipping agent account for 2%-5%.

Film corona layer/intermediate layer/hot sealing layer structural group becomes following one of several:

1、3#100％/2#100％/5#65％+6#30％+7#5％

2、1#100％/2#100％/5#65％+6#30％+7#5％

3、4#100％/2#100％/5#65％+6#30％+7#5％

4、1#100％/2#100％/5#80％+6#15％+7#5％

Wherein

1# FC801M, the isotactic HOPP

The antiplastering aid that contains 250-300ppm; TM (melt point)=160-180 ℃, MI=7.0-9.0;

2# FC801, the isotactic HOPP

Contain the antiplastering aid of 250-300ppm and the slipping agent of 750-800ppm; TM (melt point)

＝150-162℃，MI＝6.0-8.0；

3# FW4BM, polypropylene copolymer

TM(melt?point)＝100-125℃，MI＝6.5-7.5；

4# CF3230, the isotactic HOPP

TM(melt?point)＝130-140℃，MI＝6.5-7.5；

5# FL7632, the isotactic HOPP

Contain the antiplastering aid of 2400-2600ppm and the slipping agent of 950-1000ppm; TM (melt point)

＝130-140℃，MI＝6.0-7.0；

6#?5371，POE

TM(melt?point)＝60-70℃，MI＝4.5-5.0；

7# VM3000, copolymer MI=2.5-3.5

+: the expression mixing of materials.

The antitack agent of corona layer can prevent the adhesion of film and film; The slipping agent in intermediate layer can improve the smooth performance of film; The antitack agent of hot sealing layer and slipping agent can prevent the adhesion of film and film.

The present invention reduces heat-sealing temperature and not stratified effect by adding polyethylene modified material at the film hot sealing layer and reach.This polyethylene modified material and polypropylene have good miscibility, can not influence the physical property of film.After adding polythene material, the heat-sealing temperature of film is lower much than simple COPP, and can adjust the scope that reduces temperature according to adding poly ratio.

The specific embodiment

The present invention selects the film following raw materials according for use:

1# China, Kingsoft petrochemical industry, FC801M, isotactic HOPP

The antiplastering aid that contains 300ppm.TM(melt?point)＝162℃，MI＝8.0

2# China, Kingsoft petrochemical industry, FC801, isotactic HOPP

Contain the antiplastering aid of 300ppm and the slipping agent of 800ppm.TM(melt?point)＝162℃，

MI＝8.0

3# Japan, Mitsui, FW4BM, polypropylene copolymer

TM(melt?point)＝125℃，MI＝7.5

4# Korea S, Kpic, CF3230, isotactic HOPP

TM(melt?point)＝137℃，MI＝7.5

5# Singapore, TPC, FL7632, isotactic HOPP

Contain the antiplastering aid of 2500ppm and the slipping agent of 1000ppm.TM(melt?point)＝139℃，

MI＝7.0

The 6# U.S., Exxon Mobil, 5371, POE

TM(melt?point)＝64℃，MI＝5.0

The 7# U.S., Exxon Mobil, VM3000, copolymer

MI＝3.1

Film corona layer/intermediate layer/hot sealing layer structural group becomes:

1、3#100％/2#100％/5#65％+6#30％+7#5％

2、1#100％/2#100％/5#65％+6#30％+7#5％

3、4#100％/2#100％/5#65％+6#30％+7#5％

4、1#100％/2#100％/5#80％+6#15％+7#5％

Illustrate:

The 5#65%+6#30%+7#5% implication is: the 5# material accounts for gross weight 65% in the hot sealing layer, and the 6# material accounts for 30%, and the 7# material accounts for 5%, three kind of mixing of materials and evenly uses.The rest together.

The ratio of 6# can raise or reduce again, but takes all factors into consideration cost factor, and the effect of sequence number 1 is best, but formulation cost is higher.In order to reduce cost, can select other raw materials to substitute.The 3# raw material can substitute with 1# or 4#; For example, the formulation cost of sequence number 2 embodiment is minimum, and for the consideration to comprehensive qualities such as film heat sealability, wetting tension hold facility, formulation costs, 2 embodiment are better for sequence number.

If it is not too big that film need reduce heat-sealing temperature, can lower the ratio of 6#, for example sequence number 4.

Claims (1)

1, have the cast polypropylene film of low heat-sealing temperature and high heat-sealing strength, include corona processing layer, the intermediate layer, hot sealing layer is characterized in that described corona layer, is made up of the isotactic HOPP or the COPP that contain antitack agent; The intermediate layer is made up of the isotactic HOPP that contains slipping agent; Hot sealing layer is made up of the polypropylene copolymer that contains antitack agent and slipping agent; The kind of described polypropylene copolymer has: propylene-ethylene copolymer, propylene-butylene copolymer, propylene-octene copolymer, propylene-ethene-butylene trimer or propylene-ethene-octene trimer; In the hot sealing layer, polypropylene copolymer accounts for 95%-98%, and antitack agent and slipping agent account for 2%-5%; Described film corona layer/intermediate layer/hot sealing layer structural group becomes following one of several:

1、3#100％/2#100％/5#65％+6#30％+7#5％

2、1#100％/2#100％/5#65％+6#30％+7#5％

3、4#100％/2#100％/5#65％+6#30％+7#5％

4、1#100％/2#100％/5#80％+6#15％+7#5％

Wherein

1# FC801M, the isotactic HOPP

The antiplastering aid that contains 250-300ppm; TM (melt point)=160-180 ℃, MI=7.0-9.0;

2# FC801, the isotactic HOPP

Contain the antiplastering aid of 250-300ppm and the slipping agent of 750-800ppm; TM (melt point)

＝150-162℃，MI＝6.0-8.0；

3# FW4BM, polypropylene copolymer

TM(melt?point)＝100-125℃，MI＝6.5-7.5；

4# CF3230, the isotactic HOPP

TM(melt?point)＝130-140℃，MI＝6.5-7.5；

5# FL7632, the isotactic HOPP

Contain the antiplastering aid of 2400-2600ppm and the slipping agent of 950-1000ppm; TM (melt point)

＝130-140℃，MI＝6.0-7.0；

6#?5371，POE

TM(melt?point)＝60-70℃，MI＝4.5-5.0；

7# VM3000, copolymer MI=2.5-3.5

+: the expression mixing of materials.