阅读说明：本技术 线性低密度聚乙烯助剂母粒、其制备方法及应用 (Linear low-density polyethylene additive master batch, preparation method and application thereof ) 是由 高凌雁 王群涛 郭锐 李延亮 王日辉 许萍 石晶 于 2018-07-16 设计创作，主要内容包括：本发明属于聚乙烯加工领域,具体涉及一种线性低密度聚乙烯助剂母粒、其制备方法及应用。所述的线性低密度聚乙烯助剂母粒,由以下质量份数的原料制成：LLDPE树脂100份；抗氧剂0.25-1.5份；爽滑剂0.25-2.0份；硬脂酸锌0.25-1.0份；开口剂0.3-5.0份；硼酸酯0.25-2.0份。本发明在提高聚乙烯加工性能、降低加工能耗的同时,制得的薄膜制品拥有良好的光学性能。所述的制备方法,科学合理、简单易行。本发明还提供其应用,在制备吹膜用组合物时,在基础树脂中加入线性低密度聚乙烯助剂母粒,挤出造粒,即制得吹膜用组合物产品。(The invention belongs to the field of polyethylene processing, and particularly relates to a linear low-density polyethylene additive master batch, and a preparation method and application thereof. The linear low-density polyethylene additive master batch is prepared from the following raw materials in parts by mass: 100 parts of LLDPE resin; 0.25-1.5 parts of antioxidant; 0.25-2.0 parts of slipping agent; 0.25-1.0 part of zinc stearate; 0.3-5.0 parts of opening agent; 0.25-2.0 parts of borate. The invention improves the processability of polyethylene and reduces the processing energy consumption, and the prepared film product has good optical performance. The preparation method is scientific, reasonable, simple and feasible. The invention also provides the application of the composition, and when the composition for blown film is prepared, the linear low-density polyethylene additive master batch is added into the base resin, and extrusion granulation is carried out, so that the composition product for blown film is prepared.)

1. A linear low density polyethylene additive masterbatch is characterized in that: the feed is prepared from the following raw materials in parts by mass:

2. the linear low density polyethylene additive masterbatch according to claim 1, wherein: the LLDPE resin is a copolymer of ethylene and butene-1 or a copolymer of ethylene and hexene-1.

3. The linear low density polyethylene additive masterbatch according to claim 1, wherein: the density of the LLDPE resin is 0.91-0.92g/cm³The melt mass flow rate is 2-10g/10 min.

4. The linear low density polyethylene additive masterbatch according to claim 1, wherein: the antioxidant is one or more of hindered phenol antioxidant, phosphite antioxidant or thioester antioxidant.

5. The linear low density polyethylene additive masterbatch according to claim 1, wherein: the slipping agent is erucamide.

6. The linear low density polyethylene additive masterbatch according to claim 1, wherein: the opening agent is 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 or pumice.

7. The linear low density polyethylene additive masterbatch according to claim 1, wherein: the borate is organic borate containing nitrogen.

8. A method for preparing the linear low density polyethylene additive masterbatch according to any one of claims 1 to 7, wherein the method comprises the following steps: the method comprises the following steps:

(1) adding an opening agent into an ethanol solution of borate, heating and refluxing for 10-15min, evaporating the solvent, drying solid particles, and grinding into powder for later use;

(2) adding an antioxidant, zinc stearate, a slipping agent and the powder obtained in the step (1) into LLDPE resin powder, uniformly mixing, adding the uniformly mixed material into a double-screw extruder, and carrying out melting, plasticizing, extruding and granulating to obtain the linear low-density polyethylene additive master batch.

9. Use of the linear low density polyethylene additive masterbatch according to any one of claims 1 to 7, wherein: when the composition for blown film is prepared, the linear low-density polyethylene additive master batch is added into the base resin, and extrusion granulation is carried out, so as to obtain the composition product for blown film.

10. The use of the linear low density polyethylene additive masterbatch of claim 9, wherein: the addition amount of the linear low-density polyethylene additive master batch is 10 wt.% of the base resin.

Technical Field

The invention belongs to the field of polyethylene processing, and particularly relates to a linear low-density polyethylene additive master batch, and a preparation method and application thereof.

Background

Linear Low Density Polyethylene (LLDPE) is an important polyethylene resin, has wide application fields, and can be used in the fields of films, injection molding, rotational molding, cables and the like. Wherein the film is the largest field of application of LLDPE resin and accounts for more than 70% of the whole LLDPE resin.

Increasing the output per unit time during the production process is very important for film processing enterprises, but too high an extrusion speed may cause melt fracture, resulting in the occurrence of sharkskin on the film surface, thereby affecting the film appearance. The resin for the film, which is easy to process and convenient to extrude at high speed, is developed, so that the problems existing at present can be solved, the production efficiency of film enterprises is improved, and the energy consumption is reduced.

At present, in order to improve the processability of polymers, a fluoroelastomer is generally added into the polymers, the fluoroelastomer is attached to a screw in the extrusion process, and the friction between materials and the screw is reduced to improve the processability of the polymers. However, when fluoroelastomers are used as processing aids, the optical properties of the film article are affected.

Disclosure of Invention

The invention aims to provide a linear low-density polyethylene additive master batch, which improves the processability of polyethylene and reduces the processing energy consumption, and simultaneously, the prepared film product has good optical performance; the invention also provides a preparation method and application thereof.

The linear low-density polyethylene additive master batch is prepared from the following raw materials in parts by weight:

preferably, the linear low-density polyethylene additive master batch is prepared from the following raw materials in parts by weight:

more preferably, the antioxidant is 0.4-0.8 part by weight.

Wherein the content of the first and second substances,

the LLDPE resin is a copolymer of ethylene and butene-1 or a copolymer of ethylene and hexene-1.

The density of the LLDPE resin is 0.91-0.92g/cm³The melt Mass Flow Rate (MFR) is from 2 to 10g/10 min.

The antioxidant is one or more of hindered phenol antioxidant, phosphite antioxidant or thioester antioxidant.

Preferably, the antioxidant is a hindered phenol antioxidant and a phosphite antioxidant, and the mass ratio of the hindered phenol antioxidant to the phosphite antioxidant is 1: 1.

the slipping agent is erucamide.

Zinc stearate is used as an acid absorbent and also plays a role in internal lubrication. When stearate is uniformly distributed in polyethylene, the polymer begins to soften when the processing is heated, molecules of stearate penetrate into molecular chains of the polymer, mutual attraction among the molecular chains is weakened, and the molecular chains are easier to slide and rotate when the polymer is deformed.

The opening agent is 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 or pumice.

The borate is organic borate containing nitrogen.

Borate esters are commonly used as coupling agents or surfactants in plastics. The nitrogen-containing organic boric acid ester, such as amino, amido, imido, imidazolinyl, oxazolinyl and the like, has nitrogen with lone pair electrons occupying an empty P track of a boron atom, reacts under the action of heat and shear during screw extrusion to generate boron nitride, coats the boron nitride on the screw to play a role in external lubrication, and is favorable for improving the processability of polyethylene.

The zinc stearate has an internal lubricating effect, the nitrogen-containing organic boric acid ester has an external lubricating effect, and when the mass ratio of the zinc stearate to the nitrogen-containing organic boric acid ester is 1: 1-1: 2, the two components have synergistic effect, so that the processability of the polyethylene can be better improved.

The preparation method of the linear low-density polyethylene additive master batch comprises the following steps:

(1) adding an opening agent into an ethanol solution of borate, heating and refluxing for 10-15min, evaporating the solvent, drying solid particles, and grinding into powder for later use;

(2) adding an antioxidant, zinc stearate, a slipping agent and the powder obtained in the step (1) into LLDPE resin powder, uniformly mixing, adding the uniformly mixed material into a double-screw extruder, and carrying out melting, plasticizing, extruding and granulating to obtain the linear low-density polyethylene additive master batch.

In the step (2), the mixing time is 5-10 min.

When the composition for blown film is prepared, the linear low-density polyethylene additive master batch is added into the base resin, and extrusion granulation is carried out, so as to obtain the composition product for blown film.

The addition amount of the linear low-density polyethylene additive master batch is 10 wt.% of the base resin.

The base resin is one or more of LLDPE, LDPE or HDPE.

The composition can be used for polyethylene packaging films.

In recent years, china has a very large consumption in the field of flexible packaging, and is expected to grow at a high rate of 6.9% in the next 5 years, with polyethylene film representing a large share in the field of flexible packaging. The processability of the resin directly affects the productivity of the film, and the transparency of the film directly affects the appearance of the package, both of which properties have been attracting attention.

Therefore, the transparent polyethylene film which is easy to process has huge market prospect.

The invention has the following beneficial effects:

1. the invention provides the easily-processed linear low-density polyethylene additive master batch, and the prepared film product has good optical performance while improving the processability of polyethylene and reducing the processing energy consumption.

2. The master batch provided by the invention is used for preparing a film product, can improve the extrusion speed and reduce the energy consumption of an extruder, so that the production cost is reduced, and meanwhile, compared with the common processing aid, namely the fluoroelastomer, the optical performance of the film is improved, and the comprehensive performance is improved.

3. The film product prepared by the master batch has high critical shear rate, low shear viscosity and film haze, and good processability and optical performance.

4. The master batch for the polyethylene film with excellent optical performance and processability is prepared by utilizing the synergistic effect of zinc stearate and nitrogenous organic borate through a two-step addition method.

5. The linear low-density polyethylene additive master batch is applied to the preparation of polyethylene compositions in the field of films, has lower shear viscosity, screw torque and higher critical shear rate compared with the existing polyethylene compositions, and can be extruded at higher speed in the production of films, thereby improving the production efficiency, solving the film breaking phenomenon and the sharkskin phenomenon on the surfaces of the films when the films are extruded and processed by resin at high speed, and simultaneously improving the optical performance of the films.

6. The preparation method provided by the invention is scientific, reasonable, simple and feasible.

Detailed Description

The present invention is further described below with reference to examples.