CN112848594B

CN112848594B - Multifunctional polarized anti-skid film

Info

Publication number: CN112848594B
Application number: CN202110103654.7A
Authority: CN
Inventors: 邵峥
Original assignee: Zhejiang Jinrui Film Material Co ltd
Current assignee: Zhejiang Jinrui Film Material Co ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2023-03-31
Anticipated expiration: 2041-01-26
Also published as: CN112848594A

Abstract

The invention discloses a multifunctional polarization anti-skid film, which consists of an upper surface layer, a core layer and a lower surface layer, wherein the upper surface layer consists of propylene-butadiene copolymer, high-density polyethylene and linear low-density polyethylene; the core layer is homopolymerized polypropylene; the lower surface layer consists of copolymerized polypropylene and an anti-sticking agent; the antiskid coefficient of the film is more than 0.6. The anti-skid property of the film is improved by utilizing the coarsening mechanism of the flatting agent on the upper surface of the film, and the upper surface of the film generates a coarsening effect after the propylene-butadiene copolymer is mixed due to high crystallinity and poor compatibility of the high-density polyethylene and the propylene-butadiene copolymer, so that the produced film has high friction coefficient and can be stable for a long time; moreover, because the fluidity of the mixed raw material of the high-density polyethylene and the propylene-butadiene is low, in order to meet the requirement of high-speed production, a certain amount of linear low-density polyethylene is added to optimize the fluidity, thereby improving the production efficiency.

Description

Multifunctional polarized anti-skid film

Technical Field

The invention relates to a film, in particular to a multifunctional polarization anti-skid film.

Background

Since the innovation of China is open, the people level is greatly improved, the grade of commodity packaging is higher and higher, the packaging industry is rapidly developed, and the BOPP film has high transparency and luster, is nontoxic, has stable molecular structure and certain barrier function to smell and moisture, so that the BOPP film is an ideal material for product packaging, is widely applied to the industries of food, tobacco, printing and compounding, adhesive tapes and the like, and becomes the largest variety of multifunctional plastic packaging film in the packaging field.

The production of BOPP films has high technical content, is a very complicated work, reasonably controls the friction coefficient and the physical and mechanical properties related to the friction coefficient, and is the key for ensuring the operation of film packaging. At present, the packages adopted by related products such as petrifaction products, grains and the like in China are two packaging forms of plastic textile and kraft paper composite packages, and the main function of the packages is to increase the anti-skid coefficient in storage and transportation. The outer packing form has both strengthened the production intensity of wrapping bag like this, has wasted a large amount of manpower and materials, the energy, has also increased manufacturing enterprise's operating cost, and moreover this type of extranal packing does not play real anti-skidding effect in storage and transportation, especially in the storage, because the antiskid effect of plastic weaving braided bag or kraft paper bag is general, consequently can not solve the high-order problem of stacking in the storage, just so wasted the limited storage space of enterprise greatly, increased the storage degree of difficulty of enterprise. Traditionally, in order to achieve the anti-skid effect, a layer of anti-skid glue is usually coated on the surface of the anti-skid glue, and the process greatly increases the packaging cost of enterprises.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to: a multifunctional polarizing antiskid film is provided.

In order to solve the problems, the technical solution of the invention is as follows: a multifunctional polarized anti-skid film comprises an upper surface layer, a core layer and a lower surface layer;

the upper surface layer consists of propylene-butadiene copolymer, high density polyethylene and linear low density polyethylene;

the core layer is homopolymerized polypropylene;

the lower surface layer consists of polypropylene copolymer and an anti-sticking agent.

Further, the slip resistance coefficient of the film is more than 0.6.

Further, the production method of the film comprises the following steps:

(1) Weighing raw materials according to a mass ratio, respectively and independently mixing the raw materials of the upper surface layer, the base layer and the lower surface layer, and when the raw materials of the upper surface layer are mixed, firstly, blending the propylene-butadiene copolymer and the high-density polyethylene to prepare the flatting agent, and then, adding the linear low-density polyethylene into the flatting agent;

(2) The raw materials of the upper surface layer, the base layer and the lower surface layer are respectively sent into respective extruders to be melted, mixed and plasticized;

(3) Respectively sending the molten melts into three layers of die heads, and forming molten sheets through a flat die head opening after the melts are converged in the die heads;

(4) Attaching the sheet to a chill roll by using an air knife, quenching to form an unshaped sheet, cooling in water bath, and shaping the sheet to form a cast sheet;

(5) Stretching the cast sheet to form a film;

(6) The film detects the thickness through infrared rays, feeds back the corresponding thickness deviation to the die head, and corrects the thickness deviation of the film through the micro-motion of the heating power of the bolt at the corresponding position;

(7) Polarizing the upper surface layer by arc spark;

(8) And cooling and rolling the product after corona treatment.

Further, in the step (4), the water bath temperature was 85 ℃.

The invention has the beneficial effects that: the anti-skid property of the film is improved by utilizing the coarsening mechanism of the flatting agent on the upper surface of the film, and the upper surface of the film generates a coarsening effect after the propylene-butadiene copolymer is mixed due to high crystallinity and poor compatibility of the high-density polyethylene and the propylene-butadiene copolymer, so that the produced film has high friction coefficient and can be stable for a long time; moreover, because the fluidity of the mixed raw material of the high-density polyethylene and the propylene-butadiene is low, in order to meet the requirement of high-speed production, a certain amount of linear low-density polyethylene is added to optimize the fluidity, thereby improving the production efficiency.

Detailed Description

For a more intuitive and complete understanding of the technical solution of the present invention, non-limiting features are described as follows:

the first embodiment is as follows:

a multifunctional polarization anti-skid film comprises an upper surface layer, a core layer and a lower surface layer, wherein the upper surface layer is prepared from 80 mass percent of propylene-butadiene copolymer, 15 mass percent of high-density polyethylene and 5 mass percent of linear low-density polyethylene; the core layer is homopolymerized polypropylene; the lower surface layer is composed of 97% of copolymerized polypropylene and 3% of anti-sticking agent by mass percentage, the anti-sticking agent is silica anti-sticking agent, the thickness of the upper surface layer is controlled to be 1.2 mu m, the thickness of the core layer is controlled to be 13.5 mu m, and the thickness of the lower surface layer is controlled to be 1.8 mu m;

the specific production method comprises the following steps:

(1) The raw materials of the upper surface layer, the base layer and the lower surface layer are respectively and independently mixed, when the raw materials of the upper surface layer are mixed, the propylene-butadiene copolymer and the high-density polyethylene are firstly mixed to prepare the flatting agent, and then the linear low-density polyethylene is added into the flatting agent;

(4) Attaching the sheet to a chill roll by using an air knife, quenching to form an unshaped sheet, cooling the sheet in a water bath to form a cast sheet, wherein the water bath temperature is 85 ℃, and the upper surface of the film can be roughened at the water bath temperature, so that the antiskid effect can be improved;

(5) Forming a thin film after the cast sheet is stretched;

(7) Polarizing the upper surface layer by arc spark;

(8) And cooling and rolling the product.

The slip resistance coefficient of the film thus obtained was 0.61.

The second embodiment: the difference between the second embodiment and the first embodiment is that: the upper surface layer is prepared from 79 mass percent of propylene-butadiene copolymer, 16 mass percent of high-density polyethylene and 5 mass percent of linear low-density polyethylene. The slip resistance coefficient of the film thus obtained was 0.62.

Example three: the difference between the third embodiment and the first embodiment is that: the upper surface layer is prepared from 78% of propylene-butadiene copolymer, 17% of high-density polyethylene and 5% of linear low-density polyethylene in percentage by mass. The slip resistance coefficient of the film thus obtained was 0.63.

Example four: the difference between the fourth embodiment and the first embodiment is that: the upper surface layer is prepared from 79 mass percent of propylene-butadiene copolymer, 15 mass percent of high-density polyethylene and 6 mass percent of linear low-density polyethylene. The slip resistance coefficient of the film thus obtained was 0.61.

Example five: the difference between the fifth embodiment and the first embodiment is that: the upper surface layer is prepared from 80 mass percent of propylene-butadiene copolymer, 14 mass percent of high-density polyethylene and 6 mass percent of linear low-density polyethylene. The slip resistance coefficient of the film thus obtained was 0.61.

Comparative example one: the first comparative example differs from the first example in that: the bath temperature was 40 ℃. The slip resistance coefficient of the film thus obtained was 0.57.

The anti-slip coefficient of the film prepared by the embodiment is more than 0.6, and when the water bath temperature reaches 85 ℃, the anti-slip coefficient of the film can be obviously improved, and compared with the friction coefficient of a common BOPP film in the market, the friction coefficient is obviously improved by less than 0.4.

Claims

1. A multifunctional polarization anti-skid film is composed of an upper surface layer, a core layer and a lower surface layer, and is characterized in that:

the upper surface layer is composed of the following raw materials by mass: 80% of propylene-butadiene copolymer, 15% of high-density polyethylene and 5% of linear low-density polyethylene;

the core layer is homopolymerized polypropylene;

the lower surface layer consists of the following raw materials in percentage by mass: 97% of co-polypropylene and 3% of anti-sticking agent;

the production method of the film comprises the following steps:

(5) Stretching the cast sheet to form a film;

(6) The thickness of the film is detected by infrared rays, the corresponding thickness deviation is fed back to the die head, and the thickness deviation of the film is corrected by micro-motion of the heating power of the bolt at the corresponding position;

(7) Polarizing the upper surface layer by arc spark;

(8) Cooling and rolling the product after corona treatment;

in the step (4), the water bath temperature was 85 ℃.

2. The multifunctional polarizing antiskid film of claim 1, wherein: the antiskid coefficient of the film is more than 0.6.