阅读说明：本技术 一种卤化丁基橡胶包装膜及其生产工艺 (Halogenated butyl rubber packaging film and production process thereof ) 是由 徐卫国 于 2020-08-04 设计创作，主要内容包括：本发明的目的是为了解决现有卤化丁基橡胶包装膜,完全依赖进口,价格昂贵的难题,公开了一种卤化丁基橡胶包装膜及其生产工艺,其中,所述包装膜包括内层、外层和设置在内外层之间的芯层；所述芯层的原料包括以下重量份的组分：90-99份的乙烯-醋酸乙烯共聚物(EVA),0.5-2份的开口爽滑剂,和1-5份的改性母料；所述外层与内层的原料为乙烯-醋酸乙烯共聚物(EVA)。本发明填补了国内生产空白,降低了生产和运输成本,推动国内卤化丁基橡胶产业的快速发展。(The invention aims to solve the problems that the existing halogenated butyl rubber packaging film completely depends on import and is expensive, and discloses a halogenated butyl rubber packaging film and a production process thereof, wherein the packaging film comprises an inner layer, an outer layer and a core layer arranged between the inner layer and the outer layer; the core layer comprises the following raw materials in parts by weight: 90-99 parts of ethylene-vinyl acetate copolymer (EVA), 0.5-2 parts of opening slipping agent and 1-5 parts of modified master batch; the raw materials of the outer layer and the inner layer are ethylene-vinyl acetate copolymer (EVA). The invention fills the domestic production blank, reduces the production and transportation cost and promotes the rapid development of the domestic halogenated butyl rubber industry.)

1. A halogenated butyl rubber packaging film is characterized in that: the packaging film comprises an inner layer, an outer layer and a core layer arranged between the inner layer and the outer layer;

the core layer comprises the following raw materials in parts by weight: 90-99 parts of ethylene-vinyl acetate copolymer (EVA), 0.5-2 parts of opening slipping agent and 1-5 parts of modified master batch;

the melting point range of the ethylene-vinyl acetate copolymer (EVA) is 80-98 degrees; the ethylene-vinyl acetate copolymer (EVA) has a melt index of 1.9g/min and a density of 0.924 g/cm;

the raw materials of the outer layer and the inner layer are ethylene-vinyl acetate copolymer (EVA), and the melting point range of the ethylene-vinyl acetate copolymer (EVA) is 90-105 ℃; the ethylene-vinyl acetate copolymer (EVA) had a melt index of 2g/min and a density of 0.918g/cm 3.

2. The halogenated butyl rubber packaging film of claim 1, wherein: the opening slipping agent is SAB-957 or SAB-703.

3. The halogenated butyl rubber packaging film of claim 1, wherein: the master batch is a modified master batch, and the components of the modified master batch comprise 94-98 wt% of high density polyethylene HDPE, 1-3 wt% of antioxidant 168 and 1-3 wt% of light stabilizer 770.

4. The halogenated butyl rubber packaging film of claim 1, wherein: the thickness ratio of the outer layer to the core layer to the inner layer is 1: 2: 1 or 1: 3: 1.

5. the halogenated butyl rubber packaging film of claim 4, wherein: the thickness of the core layer is 2-10 filaments, the thickness of the outer layer is 1-5 filaments, and the thickness of the inner layer is 1-5 filaments.

6. The process for producing a halogenated butyl rubber packaging film according to claim 1, wherein: the method comprises the following steps:

the raw materials of the core layer are uniformly mixed, then the raw materials of the inner layer, the outer layer and the core layer are added into a discharge hopper of a three-layer co-agent upper blowing film-blowing machine, heated and melted, the melted plastic is filtered by a machine head to remove impurities, comes out from a die head die orifice, is cooled by an air ring, is blown to pass through a herringbone plate and a traction roller, and is rolled to roll the finished film into a tube.

Technical Field

The invention relates to the technical field of packaging films, in particular to a halogenated butyl rubber packaging film and a production process thereof.

Background

Halogenated butyl rubber is the product of the halogenation reaction of ordinary butyl rubber with chlorine and bromine dissolved in aliphatic hydrocarbon (such as hexane). Under certain reaction conditions, the halogen (X2) is mainly bonded in the form of allyl halogen atom, and maintains the original double bond in the butyl rubber molecule. As tire technology has evolved, inner tube tires made using butyl rubber will gradually be replaced by radial tires made from halogenated butyl rubber. At present, more than 80% of halogenated butyl rubber is used for producing an airtight layer of a radial tire, and the function of the halogenated butyl rubber is to prevent air and moisture in the tire from contacting steel rotors of the tire. And a large amount of halogenated butyl rubber is used for the bottle stopper, the heat resistance is stable, and the maximum processing temperature is 10 ℃ higher than that of the butyl rubber. The improved halogen atom increases intermolecular attraction, reduces gaps among molecular chains, and has strong sealing property and larger viscosity.

The halogenated butyl rubber is easy to have the phenomenon of adhesion of a plurality of blocks in the storage and transportation processes, great inconvenience is caused to production and transportation, an outer packaging layer is needed to be convenient to package, the rubber blocks are effectively separated from adhesion, a packaging film can be dissolved at low temperature during production, and the halogenation performance of the packaging film is not influenced.

At present, the packaging film depends on import and is expensive, no substitute product exists in China, and a technical blank exists.

Disclosure of Invention

In view of the defects of the prior art, the first object of the invention is to provide a halogenated butyl rubber packaging film.

The second purpose of the invention is to provide a production process of halogenated butyl rubber packaging film, which has the advantages of simple manufacturing method and easy operation.

In order to achieve the first object, the invention provides the following technical scheme: a halogenated butyl rubber packaging film comprises an inner layer, an outer layer and a core layer arranged between the inner layer and the outer layer;

the core layer comprises the following raw materials in parts by weight: 90-99 parts of ethylene-vinyl acetate copolymer (EVA), 0.5-2 parts of opening slipping agent and 1-5 parts of modified master batch;

the melting point range of the ethylene-vinyl acetate copolymer (EVA) is 80-98 degrees; the ethylene-vinyl acetate copolymer (EVA) has a melt index of 1.9g/min and a density of 0.924 g/cm;

the raw materials of the outer layer and the inner layer are ethylene-vinyl acetate copolymer (EVA), and the melting point range of the ethylene-vinyl acetate copolymer (EVA) is 90-105 ℃; the ethylene-vinyl acetate copolymer (EVA) had a melt index of 2g/min and a density of 0.918g/cm 3.

As a preferred technical scheme of the invention, the opening slipping agent is SAB-957 or SAB-703.

As a preferable technical scheme of the invention, the master batch is a modified master batch, the components of the modified master batch are high-density polyethylene HDPE, antioxidant 168 and light stabilizer 770, the weight percentage of the high-density polyethylene HDPE is 94-98%, the weight percentage of the antioxidant 168 is 1-3%, and the weight percentage of the light stabilizer 770 is 1-3%.

As a preferable technical solution of the present invention, the thickness ratio of the outer layer, the core layer, and the inner layer is 1: 2: 1 or 1: 3: 1.

as a preferable technical scheme of the invention, the thickness of the core layer is 2-10 filaments, the thickness of the outer layer is 1-5 filaments, and the thickness of the inner layer is 1-5 filaments.

In order to achieve the second object, the invention provides the following technical scheme: a production process of a halogenated butyl rubber packaging film comprises the following steps:

uniformly mixing the raw materials of the core layer, adding the raw materials of the inner layer and the outer layer and the uniformly mixed raw materials of the core layer into a discharge hopper of a three-layer co-agent up-blowing film blowing machine, heating and melting, filtering the molten plastic by a machine head to remove impurities, discharging the molten plastic from a die head die orifice, cooling by an air ring, blowing, passing through a herringbone plate, drawing a roller, and coiling to roll the finished film into a barrel.

Compared with the prior art, the invention has the beneficial effects that:

the halogenated butyl rubber packaging film prepared by the method fills the blank of domestic production, reduces the production and transportation cost, and promotes the rapid development of the domestic halogenated butyl rubber industry.

Detailed Description

The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto.

The words "preferred", "more preferred", and the like, in the present invention refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.