CN111073122B - Polyethylene composition and preparation method thereof - Google Patents
Polyethylene composition and preparation method thereof Download PDFInfo
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- CN111073122B CN111073122B CN201811230609.2A CN201811230609A CN111073122B CN 111073122 B CN111073122 B CN 111073122B CN 201811230609 A CN201811230609 A CN 201811230609A CN 111073122 B CN111073122 B CN 111073122B
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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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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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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- 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
- 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
- C08J2423/08—Copolymers of ethene
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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
- 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
- C08K3/34—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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/092—Polycarboxylic acids
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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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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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
Abstract
The invention belongs to the technical field of films, and particularly relates to a polyethylene composition and a preparation method thereof. The polyethylene composition comprises the following components in parts by weight: 100 parts of polyethylene resin; 5-15 parts of polyethylene master batch; the polyethylene master batch comprises carrier resin and auxiliaries, wherein the auxiliaries comprise stearate, adipic acid and an inorganic opening agent.
Description
Technical Field
The invention belongs to the technical field of films, and particularly relates to a polyethylene composition and a preparation method thereof.
Background
LLDPE films (linear low density polyethylene films) have excellent toughness, high tear strength and good puncture resistance, and are widely used for agricultural mulching films, greenhouse films and various packaging films. In recent years, with the increase of the demand of transparent materials in the packaging industry and the improvement of the requirements of agricultural film markets on the transparency of greenhouse films and mulching films, transparent LLDPE films are widely and rapidly developed by virtue of excellent mechanical properties, and the market demand is on the rise year by year. However, as the main chain of LLDPE is of a linear structure, branched chains on the molecular chain are short, the arrangement among molecules is regular, a large number of crystals and supermolecular structures are formed in the blown film processing, the crystal structure has a large size, so that the LLDPE film has poor transparency, and the popularization and application of the LLDPE film are limited by the main defect of the LLDPE film.
After LLDPE is blown into a film, the film layers are easy to form adhesion under vacuum sealing and are difficult to separate; in addition, in the long-term storage process of the polyolefin film, the macromolecular chains among the films are mutually permeated and wound, so that the films are firmly adhered together and are not easy to separate, and the use of the films is seriously influenced. In order to prevent this phenomenon, a certain amount of opening agent is usually added to form convexities and concavities on the microscopic surface of the film during the production of the film, so as to reduce the contact area between the films and prevent the formation of vacuum adhesion between the films. However, the addition of the opening agent also adversely affects the optical properties of the film, and if the dispersion is not sufficiently uniform, the mechanical properties are adversely affected.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a polyethylene composition and a preparation method thereof. The invention is realized by the following technical scheme:
according to one aspect of the present invention, there is provided a polyethylene composition comprising the following components in parts by weight:
100 parts of polyethylene resin;
5-15 parts of polyethylene master batch;
the polyethylene master batch comprises carrier resin and auxiliaries, wherein the auxiliaries comprise stearate, adipic acid and an inorganic opening agent.
Stearates are commonly used as acid scavengers, but also act as lubricants. When stearate is uniformly distributed in polyethylene, the polymer begins to soften when the processing is heated, and molecules of stearate penetrate into molecular chains of the polymer to weaken mutual attraction among the molecular chains, so that the molecular chains are easier to slide and rotate when the polymer is deformed.
According to an embodiment of the present invention, the stearate is selected from one or more of sodium stearate, potassium stearate, and zinc stearate.
According to one embodiment of the invention, the stearate is selected from sodium stearate and zinc stearate.
Sodium stearate is prepared from stearic acid and sodium hydroxide. When the linear low-density polyethylene master batch containing adipic acid and sodium stearate is added into polyethylene resin, the haze of the film can be reduced, and the optical performance of a film product can be improved.
According to one embodiment of the invention, the weight ratio of adipic acid to sodium stearate is 1:2 to 1:4. According to one embodiment of the invention, the weight ratio of adipic acid to sodium stearate is 1:3.
according to one embodiment of the invention, the ratio of sodium stearate: zinc stearate: adipic acid: the weight ratio of the carrier resin is (0.1-1.0): (0.25-1.0): (0.03-0.3): 100.
according to one embodiment of the present invention, the polyethylene resin is a linear low density polyethylene for blown film, having a density of 0.91 to 0.93g/cm 3 The melt mass flow rate MFR is from 1 to 5g/10min. According to one embodiment of the present invention, the polyethylene resin is preferably a copolymer of ethylene and 1-butene, or a copolymer of ethylene and 1-hexene.
According to one embodiment of the invention, the support resin is an LLDPE resin produced by a gas phase process using a ZieglerNatta catalyst and having a density of from 0.91 to 0.92g/cm 3 The melt mass flow rate MFR is from 2 to 10g/10min. According to one embodiment of the present invention, the polyethylene resin is preferably a copolymer of ethylene and 1-butene, or a copolymer of ethylene and 1-hexene.
In the present invention, the melt mass flow rate MFR of the polyethylene resin and the carrier resin are both measured at 2.16 Kg.
According to one embodiment of the invention, the polyethylene masterbatch comprises the following components in parts by weight:
100 parts of a carrier resin, namely,
0.15 to 1.25 parts of antioxidant, preferably 0.2 to 0.5 part,
zinc stearate 0.25-1.0 parts, preferably 0.3-0.5 parts,
sodium stearate 0.1-1.0 parts, preferably 0.3-0.6 parts,
0.03 to 0.3 part, preferably 0.1 to 0.2 part, of adipic acid,
0.3 to 5.0 parts of inorganic opening agent, preferably 1.0 to 1.5 parts,
0.01-0.5 part of slipping agent, preferably 0.05-0.3 part.
When the resin is processed into a product, a high-temperature melting process is needed, and the polyethylene is degraded or crosslinked under the action of heat, oxygen and the like during high-temperature melting, so that the structure is changed to influence the performance of the product; in addition, the product is influenced by the external heat and oxygen in the using process and the use is also influenced by the structural change. In order to avoid the influence of adverse factors such as heat, oxygen and the like in the process of processing resin and using products, an antioxidant needs to be added into a polymer system to keep the stability of the resin to heat and oxygen.
According to one embodiment of the invention, the antioxidant is selected from the group consisting of a mixture of hindered phenolic antioxidants and phosphite antioxidants. According to one embodiment of the present invention, the weight ratio of hindered phenolic antioxidant to phosphite antioxidant in the antioxidants is 1:1.
According to an embodiment of the present invention, the inorganic opening agent is selected from one or more of calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, barium sulfate, aluminum hydroxide, magnesium hydroxide, calcium oxide, magnesium oxide, titanium oxide, aluminum oxide, zinc oxide, talc, clay, kaolin, silica, hydrotalcite, diatomaceous earth, bentonite, mica, zeolite, glass powder, sepiolite, fly ash, rectorite, and pumice powder. According to one embodiment of the invention, the inorganic opening agent is selected from pumice.
According to one embodiment of the present invention, pumice powder is more susceptible to moisture and agglomeration than talc powder and is less dispersible with a smaller particle size, and therefore is treated with the stearate and adipate of the present invention for use.
According to one embodiment of the invention, the slip agent is selected from one or more of oleamide and erucamide.
According to another aspect of the present invention, there is provided a process for the preparation of a polyethylene composition as described above, comprising the steps of:
s101: preparation of polyethylene master batch:
a: mixing and stirring a first part of stearate, a first part of adipic acid, an inorganic opening agent and a solvent, removing the solvent, drying and grinding to obtain a powder;
b: mixing carrier resin, the rest of the auxiliary agent and the powder obtained in the step a, stirring, melting, plasticizing, extruding and granulating to obtain the polyethylene master batch;
s102: preparation of polyethylene composition:
and (4) adding the polyethylene master batch obtained in the step (S101) into polyethylene resin, and extruding and granulating to obtain the polyethylene composition.
According to one embodiment of the invention, the remaining auxiliaries comprise a further part of stearate, a further part of adipic acid, an antioxidant and a slip agent.
According to one embodiment of the invention, the first part of the stearate is sodium stearate and the other part of the stearate is sodium stearate and zinc stearate.
The weight of the first portion of stearate and the weight of the further portion of stearate constitute the weight of the total stearate used and likewise the weight of the first portion of adipic acid and the weight of the further portion of adipic acid constitute the weight of the total adipic acid used.
According to one embodiment of the invention, the weight of the first portion of stearate is, for example, 1/5 to 2/3, such as 1/5, 1/4, 1/3, 1/2, etc., of the total stearate weight.
According to one embodiment of the invention, the process for the preparation of the polyethylene composition specifically comprises the steps of:
preparation of polyethylene master batch:
adding a first part of sodium stearate, a first part of adipic acid and an inorganic opening agent into a round-bottom flask, then pouring a solvent (such as ethanol and methanol) and the like, magnetically stirring for 25-45 minutes, removing the solvent by using a rotary evaporator, for example, and drying the residual solid particles in a vacuum drying oven, grinding and crushing to obtain a powder for later use;
mixing the carrier resin, the rest part of sodium stearate, the rest part of adipic acid, oleamide, an antioxidant and zinc stearate with the powder obtained in the step a in a high-speed stirrer, wherein the stirring speed is 1500-1800 rpm, the stirring time is 15-25 min, and the stirring temperature is 38-43 ℃; adding the uniformly mixed materials into a double-screw extruder for melting, plasticizing, extruding and granulating to obtain the polyethylene master batch. The length-diameter ratio of the screw is 35, and the processing temperature is 220 ℃.
Preparation of polyethylene composition:
and adding the polyethylene master batch into polyethylene resin, and extruding and granulating to obtain the polyethylene composition.
The weight of the first portion of sodium stearate and the weight of the other portion of sodium stearate constitute the weight of the total sodium stearate used, and likewise, the weight of the first portion of adipic acid and the weight of the other portion of adipic acid constitute the weight of the total adipic acid used.
According to one embodiment of the invention, the weight of the first portion of sodium stearate is, for example, 1/5 to 2/3, such as 1/5, 1/4, 1/3, 1/2, 2/3, etc., of the total stearate weight.
Compared with the prior art, the invention has the following advantages:
(1) The cost is low and the material is environment-friendly; (2) the optical performance of the film is improved; and (3) the mechanical property of the film is improved.
Detailed Description
The technical solution of the invention is described in detail below with reference to specific examples.
Preparation of example 1
(1) Part of the sodium stearate and part of the adipic acid, namely: 0.15 part of sodium stearate, 0.05 part of adipic acid and 1.0 part of pumice powder are added into a round-bottom flask, then ethanol is poured into the flask, the mixture is magnetically stirred for about 30 minutes, a rotary evaporator is used for removing the solvent, and the residual solid particles are dried in a vacuum drying oven and ground for later use.
(2) To 100 parts of carrier resin powder, the remaining parts of sodium stearate and adipic acid are added, namely: 0.15 part of sodium stearate, 0.05 part of adipic acid, 0.4 part of antioxidant, 0.05 part of oleamide, 0.3 part of zinc stearate and the powder treated in the step (1). Mixing in a high-speed stirrer at a stirring speed of 1600 rpm for 15min at a stirring temperature of 41 ℃; and adding the uniformly mixed materials into a double-screw extruder, and melting, plasticizing, extruding and granulating. The length-diameter ratio of the screw is 35, and the processing temperature is 220 ℃.
(3) The composition of example 1 was prepared by adding 10 parts by weight of polyethylene master batch pellets to 100 parts by weight of LLDPE resin and granulating.
Preparation of example 2
The same procedure as in production example 1 was repeated except that the sodium stearate was used in an amount of 0.1 part in each of steps (1) and (2), to obtain the composition of example 2.
Preparation of example 3
The same procedure as in production example 1 was repeated except that the adipic acid was used in an amount of 0.1 part in each of steps (1) and (2), to obtain a composition of example 3.
Preparation of example 4
The same procedure as in production example 1 was repeated except that in each of step (1) and step (2), the amount of adipic acid was 0.025 parts and the amount of sodium stearate was 0.075 part, to obtain the composition of example 4.
Preparation of example 5
The same procedures as in preparation example 1 were repeated except that the adipic acid and sodium stearate in step (1) and step (2) were each 0.125 part and 0.375 part, respectively, to obtain the composition of example 5.
Preparation of example 6
The composition of example 6 was obtained in the same manner as in preparation example 1 except that the inorganic opening agent was 800 mesh talc.
Preparation of example 7
The composition of example 7 was obtained in the same manner as in preparation example 1 except that the inorganic opening agent was 1000 mesh talc.
Comparative preparation example 1
The same procedure as in preparation example 1 was conducted except that adipic acid was not used, and the composition of comparative example 1 was obtained.
Comparative preparation example 2
The same procedure as in preparation example 1 was conducted except that sodium stearate was not used, and the composition of comparative example 2 was obtained.
Comparative preparation example 3
The same procedure as in production example 1 was repeated except that the amount of adipic acid in each of steps (1) and (2) was 0.2 part, to obtain a composition of comparative example 3.
Comparative preparation example 4
The same procedure as in production example 1 was repeated except that the amount of sodium stearate in each of step (1) and step (2) was 0.55 part, to obtain a composition of comparative example 4.
Comparative preparation example 5
(1) Adding all sodium stearate and all adipic acid (i.e. 0.3 part sodium stearate, 0.1 part adipic acid), 1.0 part pumice powder into a round bottom flask, adding ethanol, magnetically stirring for about 30 minutes, removing solvent with a rotary evaporator, drying the remaining solid particles in a vacuum drying oven, and grinding to obtain powder for later use.
(2) And (2) adding 0.4 part of antioxidant, 0.05 part of oleamide and 0.3 part of zinc stearate into 100 parts of carrier resin powder, and obtaining the powder treated in the step (1). Mixing in a high-speed stirrer at a stirring speed of 1600 rpm for 15min at a stirring temperature of 41 ℃; and adding the uniformly mixed materials into a double-screw extruder, and melting, plasticizing, extruding and granulating. The length-diameter ratio of the screw is 35, and the processing temperature is 220 ℃.
(3) The composition of comparative example 5 was prepared by adding 10 parts by weight of polyethylene master batch pellets to 100 parts by weight of LLDPE resin and pelletizing.
Comparative preparation example 6
(1) Adding part of zinc stearate and part of adipic acid (namely 0.15 part of zinc stearate and 0.05 part of adipic acid) and 1.0 part of pumice powder into a round-bottom flask, then pouring ethanol, magnetically stirring for about 30 minutes, removing the solvent by using a rotary evaporator, drying the rest solid particles in a vacuum drying oven, and grinding and crushing for later use.
(2) Adding the rest of zinc stearate and adipic acid into 100 parts of carrier resin powder, namely: 0.45 part of sodium stearate, 0.05 part of adipic acid, 0.4 part of antioxidant and 0.05 part of oleamide, and the powder treated in the step (1). Mixing in a high-speed stirrer at a stirring speed of 1600 rpm for 15min at a stirring temperature of 41 ℃; and adding the uniformly mixed materials into a double-screw extruder, and melting, plasticizing, extruding and granulating. The length-diameter ratio of the screw is 35, and the processing temperature is 220 ℃.
(3) To 100 parts by weight of LLDPE resin, 10 parts by weight of polyethylene master batch pellets were added and pelletized to obtain the composition of comparative example 6.
Comparative preparation example 7
(1) Part of the sodium stearate and part of the adipic acid, namely: 0.15 part of sodium stearate and 0.05 part of adipic acid are added into a round-bottom flask, then ethanol is poured into the flask, the mixture is magnetically stirred for about 30 minutes, a rotary evaporator is used for removing the solvent, and the residual solid particles are placed in a vacuum drying oven for drying and are ground and crushed for standby.
(2) To 100 parts of carrier resin powder, the remaining parts of sodium stearate and adipic acid are added, namely: 0.15 part of sodium stearate, 0.05 part of adipic acid, 1.0 part of pumice powder, 0.4 part of antioxidant, 0.05 part of oleamide and 0.3 part of zinc stearate, and the powder treated in the step (1). Mixing in a high-speed stirrer at a stirring speed of 1600 rpm for 15min at a stirring temperature of 41 ℃; and adding the uniformly mixed materials into a double-screw extruder, and melting, plasticizing, extruding and granulating. The length-diameter ratio of the screw is 35, and the processing temperature is 220 ℃.
(3) To 100 parts by weight of LLDPE resin, 10 parts by weight of polyethylene master batch pellets were added and pelletized to obtain the composition of comparative example 7.
Comparative preparation example 8
(1) Part of the sodium stearate and part of the adipic acid, namely: 0.15 part of sodium stearate and 0.05 part of adipic acid are added into a round-bottom flask, then ethanol is poured into the flask, the mixture is magnetically stirred for about 30 minutes, a rotary evaporator is used for removing the solvent, and the residual solid particles are placed in a vacuum drying oven for drying and are ground and crushed for standby.
(2) To 100 parts of carrier resin powder, the remaining parts of sodium stearate and adipic acid are added, namely: 0.15 part of sodium stearate, 0.05 part of adipic acid, 1.0 part of talcum powder, 0.4 part of antioxidant, 0.05 part of oleamide, 0.3 part of zinc stearate and the powder treated in the step (1). Mixing in a high-speed stirrer at a stirring speed of 1600 rpm for 15min at a stirring temperature of 41 ℃; and adding the uniformly mixed materials into a double-screw extruder, and melting, plasticizing, extruding and granulating. The length-diameter ratio of the screw is 35, and the processing temperature is 220 ℃.
(3) To 100 parts by weight of LLDPE resin, 10 parts by weight of polyethylene master batch pellets were added and pelletized to obtain the composition of comparative example 8.
In the examples of the present invention and the comparative examples, the polyethylene resin had MFR =2.0g/10 mm and a density of 0.920g/cm 3 The carrier resin is ethylene and butene-1 copolymerized LLDPE, and the antioxidant is tetra [ beta- (3,5 ditertiary butyl-4-hydroxyphenyl) propionic acid]A mixture of pentaerythritol ester (indicated as a in tables 2 and 3) and tris (2,4-di-tert-butylphenyl) phosphite (indicated as B in tables 2 and 3).
In each comparative example of the present invention, the MFR =10.0g/10mim, density 0.910g/cm of the carrier resin 3 。
In examples 1 to 5, the particle size of the pumice powder is 800 mesh, in example 6, the particle size of the talc powder is 800 mesh, and in example 7, the particle size of the talc powder is 1000 mesh; in comparative examples 1 to 7, the pumice powder had a particle size of 800 mesh, and in comparative example 8, the talc had a particle size of 800 mesh.
MFR and Density values of the Carrier resins in the examples of Table 1
The compositions and contents of the respective compositions in the examples of the present invention and the comparative examples are shown in tables 2 and 3.
Composition and content of each composition in Table 2
TABLE 3 composition and content of each composition in comparative examples
The compositions of examples and comparative examples were evaluated for their properties in tables 4 to 5. The composition was blown into a film of 30 μm and tested for optical properties and film tensile strength after two weeks of standing, the results are shown in tables 4 and 5, respectively.
TABLE 4 optical Properties of the films prepared
| Sample (I) | Haze% |
| Example 1 | 9.4 |
| Example 2 | 10.6 |
| Example 3 | 11.2 |
| Example 4 | 12.3 |
| Example 5 | 13.7 |
| Example 6 | 12.3 |
| Example 7 | 9.9 |
| Comparative example 1 | 18.1 |
| Comparative example 2 | 16.6 |
| Comparative example 3 | 16.2 |
| Comparative example 4 | 21.2 |
| Comparative example 5 | 15.0 |
| Comparative example 6 | 15.6 |
| Comparative example 7 | 17.6 |
| Comparative example 8 | 17.1 |
TABLE 5 tensile Strength of the films prepared
(1) From example 1, example 2, and example 3, it can be seen that when the adipic acid and sodium stearate are added in a ratio of 1:3, the film produced has the best properties.
(2) As can be seen from example 1 and comparative example 5, adipic acid and sodium stearate have better effects when a part of adipic acid and sodium stearate are pretreated and the other part of adipic acid and sodium stearate are directly added.
(3) It can be seen from example 1 and comparative example 6 that zinc stearate is less effective when added in place of sodium stearate.
(4) As can be seen from example 1 and comparative examples 7 and 8, the effect of the opening agent is poor when the opening agent is not treated by the method, and the effect of the opening agent is better when pumice powder is selected to replace the common talcum powder. Compared with talcum powder and pumice powder treated by the method, the pumice powder has more obvious improvement on the optical property and the mechanical property of the film.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. All embodiments of the invention are to be considered as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.
Claims (4)
1. A polyethylene composition is characterized by comprising the following components in parts by weight:
100 parts of polyethylene resin;
5-15 parts of polyethylene master batch;
the polyethylene master batch comprises carrier resin and auxiliaries, wherein the auxiliaries comprise stearate, adipic acid, an inorganic opening agent, an antioxidant and a slipping agent;
the stearate is selected from sodium stearate and zinc stearate; sodium stearate: zinc stearate: adipic acid: the weight ratio of the carrier resin is (0.1-1.0): (0.25-1.0): (0.03-0.3): 100;
the antioxidant is selected from a mixture of hindered phenol antioxidants and phosphite antioxidants;
the inorganic opening agent is selected from one or more of calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, barium sulfate, aluminum hydroxide, magnesium hydroxide, calcium oxide, magnesium oxide, titanium oxide, aluminum oxide, zinc oxide, talc, clay, kaolin, silicon oxide, hydrotalcite, diatomite, bentonite, mica, zeolite, glass powder, sepiolite, fly ash, rectorite and pumice powder;
the slipping agent is selected from one or more of oleamide and erucamide;
the preparation method of the polyethylene composition comprises the following steps:
s101: preparation of polyethylene masterbatch:
a: mixing and stirring a first part of stearate, a first part of adipic acid, an inorganic opening agent and a solvent, removing the solvent, drying and grinding to obtain a powder;
b: b, mixing carrier resin, the rest of the auxiliary agent and the powder obtained in the step a, stirring, melting, plasticizing, extruding and granulating to obtain the polyethylene master batch; the rest of the auxiliary agents comprise another part of stearate, another part of adipic acid, an antioxidant and a slipping agent;
s102: preparation of polyethylene composition:
adding the polyethylene master batch obtained in the step S101 into a polyethylene resin, and extruding and granulating to obtain the polyethylene composition.
2. The polyethylene composition according to claim 1, wherein the polyethylene resin is a linear low density polyethylene resin for blown filmPolyethylene with density of 0.91-0.93g/cm 3 The melt mass flow rate MFR is from 1 to 5g/10min.
3. Polyethylene composition according to claim 1, wherein the carrier resin is a LLDPE resin produced by a gas phase process with a ZieglerNatta catalyst and having a density of 0.91-0.92g/cm 3 The melt mass flow rate MFR is from 2 to 10g/10min.
4. The polyethylene composition according to claim 1, wherein the polyethylene masterbatch comprises the following components in parts by weight:
100 parts of carrier resin, 0.15-1.25 parts of antioxidant, 0.25-1.0 part of zinc stearate, 0.1-1.0 part of sodium stearate, 0.03-0.3 part of adipic acid, 0.3-5.0 parts of inorganic opening agent and 0.01-0.5 part of slipping agent.
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| US5342868A (en) * | 1991-12-05 | 1994-08-30 | Asahi Denka Kogyo Kabushiki Kaisha | Crystalline synthetic resin composition |
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