CN111117050A - PE blown film and preparation method thereof - Google Patents
PE blown film and preparation method thereof Download PDFInfo
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- CN111117050A CN111117050A CN201911363129.8A CN201911363129A CN111117050A CN 111117050 A CN111117050 A CN 111117050A CN 201911363129 A CN201911363129 A CN 201911363129A CN 111117050 A CN111117050 A CN 111117050A
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
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Abstract
The invention discloses a PE blown film and a preparation method thereof, which belong to the technical field of film materials and are mainly prepared from the following raw materials in parts by weight: 60-100 parts of linear low-density polyethylene and 10-25 parts of low-density polyethylene, wherein the density of the linear low-density polyethylene is 0.915~0.921 g/cm3The density of the low-density polyethylene is 0.922-0.926 g/cm3. The invention mixes the linear low density polyethylene and the low density polyethylene according to the proportion, can integrate the advantages of the linear low density polyethylene and the low density polyethylene, and improves the transparency and the tensile strength of the PE blown film. Meanwhile, the density difference between the selected linear low-density polyethylene and the selected low-density polyethylene is small, the layering phenomenon cannot occur in the melting process, and a melt body which is uniformly mixed can be obtained, so that the prepared PE blown film is uniform in material quality.
Description
Technical Field
The invention relates to the technical field of film materials, in particular to a PE blown film and a preparation method thereof.
Background
With the continuous improvement of living standard of people, people not only have a plurality of requirements on the performance of products, but also have higher and higher requirements on the packaging and appearance of the products. When people select commodities, the quality and appearance of the outer package of the product also become an important consideration index for people to select the product and judge the quality of the product. The plastic film is most widely applied in the field of packaging, and can be used for food packaging, electric appliance product packaging, commodity packaging and the like.
The PE film, i.e., polyethylene film, has the characteristics of low moisture resistance and moisture permeability, and has good chemical stability, water resistance and scratch resistance, and thus is widely used as a packaging film material. For example, chinese patent publication No. CN102485783B discloses a method for preparing linear low density polyethylene, which has high printability but has the problems of low transparency and low tensile strength, and is easily damaged.
Disclosure of Invention
In view of the defects of the prior art, the first object of the present invention is to provide a PE blown film to solve the problems of low transparency and low tensile strength.
The second purpose of the invention is to provide a preparation method of PE blown film, which has the advantages of simple preparation method and uniform thickness of the prepared PE blown film.
In order to achieve the first object, the invention provides the following technical scheme:
a PE blown film is mainly prepared from the following raw materials in parts by weight: 60-100 parts of linear low density polyethylene and 10-25 parts of low density polyethylene, wherein the density of the linear low density polyethylene is 0.915-0.921 g/cm3The density of the low-density polyethylene is 0.922-0.926 g/cm3。
By adopting the technical scheme, the linear low-density polyethylene has high tensile, puncture and tear resistance and good environmental stress cracking resistance, and when the material is used as a film, the thickness of the film is small, but the stability of the film bubble is difficult to control during processing, and the equipment load is large. The low-density polyethylene has good opening property, high transparency and easy processing, and can improve the integral bubble stability of the mixture when being mixed with linear low-density polyethylene to prepare a polyethylene film. The invention mixes the linear low density polyethylene and the low density polyethylene according to the proportion, can combine the tensile property of the linear low density polyethylene with the high transparency of the low density polyethylene, and improves the transparency and tensile strength of the PE blown film. Meanwhile, the density difference between the selected linear low-density polyethylene and the selected low-density polyethylene is small, the layering phenomenon cannot occur in the melting process, and a melt body which is uniformly mixed can be obtained, so that the prepared PE blown film is uniform in material quality.
Further, the feed is mainly prepared from the following raw materials in parts by weight: 70-80 parts of linear low-density polyethylene and 15-20 parts of low-density polyethylene.
By adopting the technical scheme, the proportion of the linear low-density polyethylene to the low-density polyethylene is further optimized, and the PE blown film with more excellent performance is favorably obtained.
Further, the linear low density polyethylene has a melt index of 1.6-2.0 g/10min, and the low density polyethylene has a melt index of 1.9-2.2 g/10 min.
By adopting the technical scheme, the preferred melt index of the linear low-density polyethylene is 1.6-2.0 g/10min, and the preferred melt index of the low-density polyethylene is 1.9-2.2 g/10min, so that the linear low-density polyethylene and the low-density polyethylene have better compatibility within a certain range, the linear low-density polyethylene and the low-density polyethylene can be dispersed mutually more uniformly when being melted and mixed, the processability of materials is improved, the uniformity of the prepared polyethylene film is further improved, and the tensile strength of the PE blown film is improved.
Further, the PE film further comprises 0.5-2 parts of an anti-blocking agent, wherein the anti-blocking agent is one or two of stearamide and amide wax.
By adopting the technical scheme, the anti-adhesion agent can improve the processability of rubber materials, can obviously reduce the friction coefficient of resin, improve the dispersion effect of various additives, improve the easy processability of the resin and the opening property of films, and endow products with good gloss and transparency, and the anti-adhesion agent is added into the PE blown film, so that the adhesion of plastic films can be prevented, the anti-adhesion property is good, and the adhesion among the films can be effectively prevented. Meanwhile, the invention adopts the stearamide and the amide wax as the anti-adhesion agent, so that inorganic impurities introduced into the polyethylene film by the inorganic anti-adhesion agent can be prevented from influencing the mechanical property of the polyethylene film, and the stearamide and the amide wax are arranged in a chain shape, so that protrusions are not easy to form on the surface of the film in the preparation process, and the surface quality of the prepared film is improved.
Further, the PE film further comprises 1-2 parts of a toughening agent, wherein the toughening agent is one or two of talcum powder and calcium carbonate powder.
By adopting the technical scheme, the toughening agent can reduce brittleness, increase toughness, increase film flexibility and improve bearing strength, so that the processing performance of the PE blown film is improved, the tensile strength, toughness and other performances of the film are improved, and a better toughening effect is realized at lower cost.
Further, the PE film further comprises 1-5 parts of a scratch resistant agent, wherein the scratch resistant agent is one or two of erucamide and polytetrafluoroethylene.
By adopting the technical scheme, the scratch resistance agent can reduce the friction coefficient, increase the elastic deformation recovery capability and improve the scratch and wear resistance of the PE blown film, and the PE blown film has the advantages of high tensile strength and scratch resistance under the cooperation of the scratch resistance agent and the toughening agent. The erucamide contains abundant amide groups, can form a cross-linking structure with the anti-blocking agent, and improves the toughness and the tensile resistance of the film.
In order to achieve the second object, the invention provides the following technical scheme:
a preparation method of a PE blown film comprises the following steps:
a. mixing and stirring linear low-density polyethylene, an anti-blocking agent, a toughening agent and an anti-scraping agent for 10-20 min, heating to melt, and granulating to obtain polyethylene plastic particles;
b. b, pressurizing and heating the polyethylene plastic particles obtained in the step b to obtain a molten mass, and blowing a film on the molten mass to obtain a film;
c. and cooling the film to obtain the PE blown film.
By adopting the technical scheme, the low-density polyethylene raw material with a certain proportion is added into the linear low-density polyethylene raw material, so that the transparency of the film is improved, and the anti-adhesion agent, the toughening agent and the scratch resistance agent are added into the raw material, so that the tensile strength and the scratch resistance of the film are improved.
Further, in the step b, the rotating speed of mixing and stirring is 800-1000 r/min.
By adopting the technical scheme, the linear low-density polyethylene and the low-density polyethylene have different densities, the layering phenomenon is easy to occur in the stirring process, the rotating speed of the high-speed mixer is set to be 800-1000 r/min, the rotating speed is higher, and the raw materials are favorably and uniformly mixed.
Further, in the step b, the heating and melting temperature is 150-185 ℃.
By adopting the technical scheme, the heating temperature is set to be 150-185 ℃, and the raw materials can be fully melted and mixed.
Further, in the step c, the pressure is increased to 1.8-2.2 MPa, and the heating temperature is 160-200 ℃.
By adopting the technical scheme, the PE blown film is obtained by pressurizing, heating and blowing the polyethylene plastic particles before film blowing.
In conclusion, the invention has the following beneficial effects:
first, the invention mixes the linear low density polyethylene and the low density polyethylene according to the proportion and blows the film, which can integrate the advantages of the two, and improve the transparency and tensile strength of the PE blown film.
Secondly, the PE blown film disclosed by the invention is added with the scratch resistance agent and the toughening agent, and the scratch resistance agent and the toughening agent are used in a matched manner, so that the brittleness and the friction coefficient of the film can be reduced, and the tensile strength and the scratch resistance of the film are improved.
And thirdly, the anti-blocking agent is added into the PE blown film, so that the plastic film can be prevented from being adhered, the anti-blocking performance is good, and the adhesion among the films can be effectively prevented.
Fourthly, the preparation method of the PE blown film is simple in process, easy to implement and high in practicability.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
In the following examples, the linear low density polyethylene used was a plastic material of type LLDPE/DFDA-7042N, having a density of 0.918g/cm3The melt index is 1.9g/10 min; the low density polyethylene is made of LDPE/2426H plastic material and has a density of 0.925g/cm3The melt index was 2.1g/10 min.
Example 1
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 60kg of linear low-density polyethylene, 10kg of low-density polyethylene, 0.5kg of stearamide, 1kg of talcum powder and 1kg of polytetrafluoroethylene.
A method of making the PE blown film of example 1 comprising the steps of:
a. putting 60kg of linear low-density polyethylene raw material, 10kg of low-density polyethylene raw material, 0.5kg of stearamide, 1kg of talcum powder and 1kg of polytetrafluoroethylene into a high-speed mixer, mixing and stirring for 10min, wherein the rotating speed of the high-speed mixer is 800r/min, heating the mixed materials to 150 ℃ to melt the materials, and then granulating to obtain polyethylene plastic particles;
b. pressurizing the polyethylene plastic particles obtained in the step a to 1.8MPa, heating to 160 ℃ to obtain a molten mass, and blowing a film to the molten mass to obtain a film;
c. and cooling the film to obtain the PE blown film.
Example 2
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 60kg of linear low-density polyethylene, 15kg of low-density polyethylene, 0.3kg of stearamide, 0.4kg of amide wax, 0.5kg of talcum powder, 0.7kg of calcium carbonate powder, 0.5kg of erucamide and 1kg of polytetrafluoroethylene.
A method of making the PE blown film of example 2 comprising the steps of:
a. putting 60kg of linear low-density polyethylene raw material, 15kg of low-density polyethylene raw material, 0.3kg of stearamide, 0.4kg of amide wax, 0.5kg of talcum powder, 0.7kg of calcium carbonate powder, 0.5kg of erucamide and 1kg of polytetrafluoroethylene into a high-speed mixer, mixing and stirring for 15min, wherein the rotating speed of the high-speed mixer is 900r/min, heating the mixed materials to 160 ℃ to melt the materials, and then granulating to obtain polyethylene plastic particles;
b. pressurizing the polyethylene plastic particles obtained in the step a to 2.0MPa, heating to 180 ℃ to obtain a molten mass, and blowing the molten mass to obtain a film;
c. and cooling the film to obtain the PE blown film.
Example 3
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 75kg of linear low-density polyethylene, 15kg of low-density polyethylene, 0.9kg of stearamide, 1.4kg of talcum powder and 2kg of polytetrafluoroethylene.
A method of making the PE blown film of example 3 comprising the steps of:
a. putting 75kg of linear low-density polyethylene raw material, 15kg of low-density polyethylene raw material, 0.9kg of stearamide, 1.4kg of talcum powder and 1kg of polytetrafluoroethylene into a high-speed mixer for mixing for 20min, wherein the rotating speed of the high-speed mixer is 1000r/min, heating the mixed materials to 185 ℃ to melt the materials, and then granulating to obtain polyethylene plastic particles;
b. pressurizing the polyethylene plastic particles obtained in the step a to 2.22MPa, heating to 200 ℃ to obtain a molten mass, and blowing the molten mass to obtain a film;
c. and cooling the film to obtain the PE blown film.
Example 4
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 90kg of linear low-density polyethylene, 15kg of low-density polyethylene, 1.2kg of stearamide, 1.5kg of talcum powder and 2.5kg of polytetrafluoroethylene.
A PE blown film was prepared in the same manner as in example 3.
Example 5
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 80kg of linear low-density polyethylene, 20kg of low-density polyethylene, 1kg of stearamide, 0.5kg of amide wax, 0.6kg of talcum powder, 1kg of calcium carbonate powder, 1kg of erucamide and 2kg of polytetrafluoroethylene.
A PE blown film was prepared in the same manner as in example 2.
Example 6
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 75kg of linear low-density polyethylene, 25kg of low-density polyethylene, 1.8kg of stearamide, 1.8kg of talcum powder and 3.5kg of polytetrafluoroethylene.
A PE blown film was prepared in the same manner as in example 1.
Example 7
The PE blown film of the embodiment is prepared from the following raw materials in parts by weight: 100kg of linear low-density polyethylene, 25kg of low-density polyethylene, 1kg of stearamide, 1kg of amide wax, 1kg of talcum powder, 1kg of calcium carbonate powder, 2kg of erucamide and 3kg of polytetrafluoroethylene.
A PE blown film was prepared in the same manner as in example 3.
Comparative example 1
The PE blown film of this comparative example was made from the following raw materials by weight: 80kg of linear low-density polyethylene, 1kg of stearamide, 0.5kg of amide wax, 0.6kg of talcum powder, 1kg of calcium carbonate powder, 1kg of erucamide and 2kg of polytetrafluoroethylene
A PE blown film was prepared in the same manner as in example 2.
Comparative example 2
The PE blown film of this comparative example was made from the following raw materials by weight: 80kg of linear low-density polyethylene, 20kg of low-density polyethylene, 1.5kg of stearamide, 1.6kg of talcum powder and 3kg of polytetrafluoroethylene.
A PE blown film was prepared in the same manner as in example 2.
Comparative example 3
The PE blown film of this comparative example was made from the following raw materials by weight: 80kg of linear low-density polyethylene, 20kg of low-density polyethylene and 1.5kg of stearamide.
A PE blown film was prepared in the same manner as in example 2.
Performance test
The PE blown films obtained in the examples and the PE blown film obtained in the comparative example were subjected to performance evaluation test tests, and the test results are shown in table 1.
TABLE 1 Performance parameters of the PE blown films prepared in the examples and comparative examples
As can be seen from Table 1, the PE blown film of the present invention has good transparency and tensile strength, and improves the overall properties of the film.
It can be seen from the comparison of the examples and comparative example 1 that the addition of low density polyethylene to the PE blown film provides good openness and high transparency of the low density polyethylene, and the ratio of linear low density polyethylene to low density polyethylene is adjusted to provide good transparency of the PE blown film.
By comparing the embodiment 5 with the embodiment 3, the toughening agent and the scratch resistance agent are added, and the scratch resistance agent and the toughening agent are used in a matching way, so that the brittleness and the friction coefficient of the film can be reduced, and the tensile strength and the scratch resistance of the film can be improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The PE blown film is characterized by being mainly prepared from the following raw materials in parts by weight: 60-100 parts of linear low density polyethylene and 10-25 parts of low density polyethylene, wherein the density of the linear low density polyethylene is 0.915-0.921 g/cm3The density of the low-density polyethylene is 0.922-0.926 g/cm3。
2. The PE blown film according to claim 1, which is mainly prepared from the following raw materials in parts by weight: 70-80 parts of linear low-density polyethylene and 15-20 parts of low-density polyethylene.
3. The PE blown film according to claim 1, wherein the linear low density polyethylene has a melt index of 1.6 to 2.0g/10min, and the low density polyethylene has a melt index of 1.9 to 2.2g/10 min.
4. The PE blown film according to claim 1, further comprising 0.5-2 parts of an anti-blocking agent, wherein the anti-blocking agent is one or both of stearamide and amide wax.
5. The PE blown film according to claim 1, further comprising 1-2 parts of a toughening agent, wherein the toughening agent is one or two of talcum powder and calcium carbonate powder.
6. The PE blown film according to claim 1, further comprising 1-5 parts of a scratch resistant agent, wherein the scratch resistant agent is one or two of erucamide and polytetrafluoroethylene.
7. The process for the preparation of a PE blown film according to any one of claims 1 to 6, characterized in that it comprises the following steps:
a. mixing and stirring linear low-density polyethylene, an anti-blocking agent, a toughening agent and an anti-scraping agent for 10-20 min, heating to melt, and granulating to obtain polyethylene plastic particles;
b. b, pressurizing and heating the polyethylene plastic particles obtained in the step a to obtain a molten mass, and blowing a film on the molten mass to obtain a film;
c. and cooling the film to obtain the PE blown film.
8. The method for preparing PE blown film according to claim 7, wherein in the step a, the rotation speed of the mixing and stirring is 800-1000 r/min.
9. The method for preparing the PE blown film according to claim 7, wherein the temperature for melting by heating in the step a is 150-185 ℃.
10. The method of claim 7, wherein the pressure in step b is 1.8-2.2 MPa and the heating temperature is 160-200 ℃.
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Application publication date: 20200508 |