JP2002225914A - Method for preventing rubber veil from being tightly attached - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preventing a rubber veil from being tightly attached in which the rubber veil is packaged by a plastic film capable of preventing slippage caused by adhesion of applied slipping agent to a hand of a worker and degradation of the handling property of the rubber veil without degrading any working environment by the scatter of fine powder of the slipping agent at a site of manufacturing a synthetic rubber and at a site of using the rubber. SOLUTION: In this method for preventing the rubber veil from being tightly attached, the rubber veil is packaged by an embossed plastic film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing adhesion of rubber veil and a method for preventing fusion, characterized in that a rubber veil is wrapped with an embossed plastic film such as polyethylene.

[0002]

2. Description of the Related Art When shipping rubber such as polybutadiene in the form of a bale, it may be shipped packed in a polyethylene film. In the state where the rubber is packaged with a polyethylene film,
A method of putting into a kneader such as a Banbury mixer and using it is used. In this case, the polyethylene film used for packaging needs to be melted during kneading and dispersed in rubber. Therefore, a high-pressure low-density polyethylene having a low melting point is generally used.

Japanese Patent Application Laid-Open No. 5-337944 discloses that a rubber veil is wrapped in a plastic film in which 0.1 to 70% by weight of a lubricant in a ratio of (lubricant) / (plastic + lubricant) has been kneaded. A method for preventing adhesion and fusion of a rubber veil is disclosed.

Japanese Patent Application Laid-Open No. 9-1740 discloses that a low-density polyethylene layer is provided on a surface in contact with synthetic rubber as a content, and a high-density polyethylene layer or high-density polyethylene and linear low-density polyethylene are provided on the opposite surface. An easy-peelable multilayer film for synthetic rubber packaging, characterized by having a composition layer comprising:

JP-A-10-235814 discloses that a high-pressure method low-density polyethylene (A) and an ethylene-α-olefin copolymer having a specific density, a melt flow rate, a melt flow rate ratio, and a molecular weight distribution are mainly used. A multilayer film for rubber packaging comprising a layer B. B having an ethylene-α-olefin copolymer as a main component having a specific density, melt flow rate, melt flow rate ratio, and molecular weight distribution
There is disclosed a multilayer film for rubber packaging having a layer as a core material and a high-pressure low-density polyethylene (A) as a coating layer.

JP-A-10-237190 discloses a specific density, melt flow rate, melt flow rate ratio,
10 to 100% by weight of an ethylene-α-olefin copolymer having a molecular weight distribution and 90 to 90% of a high-pressure low-density polyethylene
A rubber packaging film comprising 0% by weight is disclosed.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method of manufacturing a synthetic rubber in which a lubricant is applied to a site where a fine powder of the lubricant is scattered and the working environment is not deteriorated. It is an object of the present invention to provide a method for preventing adhesion of rubber veil and a method for preventing fusion, which are characterized in that the rubber veil is wrapped with a plastic film without preventing slipperiness due to sticking to a hand and lowering the handleability of the rubber veil. Aim.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a method for preventing adhesion of a rubber veil, which comprises packaging the rubber veil with an embossed plastic film.

Preferably, in the present invention, the embossed plastic film is an embossed plastic film having a value of [(haze)-(internal haze)] of 20% or more. The present invention relates to a method for preventing adhesion of a rubber veil.

Preferably, the present invention relates to the above method for preventing adhesion of a rubber veil, wherein the plastic film is a polyethylene film selected from an ethylene-α-olefin copolymer and a high-pressure low-density polyethylene.

[0011] Preferably, the present invention relates to the above method for preventing adhesion of a rubber veil, wherein the ethylene-α-olefin copolymer is an ethylene-α-olefin copolymer produced by a metallocene catalyst.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The method for preventing adhesion of a rubber veil according to the present invention is a method for preventing adhesion of a rubber veil, which comprises packaging the rubber veil with an embossed plastic film.

Further, by packaging the rubber veil with the embossed plastic film of the present invention,
It is possible to prevent fusion of the rubber veil, and to provide a method for preventing fusion of the rubber veil.

The rubber used in the present invention may be any rubber that can be packaged in a veil, such as polybutadiene rubber (BR, etc.), oil-extended polybutadiene rubber (oil-extended BR, etc.).
Synthetic rubber such as styrene butadiene rubber (such as SBR), oil-extended styrene butadiene rubber (such as oil-extended SBR), nitrile rubber (such as NBR), butyl rubber, ethylene propylene rubber, polyisobutylene rubber, and chloroprene rubber, and natural rubber. Can be mentioned.

Examples of the plastic film include polyethylene such as low-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer and ethylene-vinyl acetate copolymer, propylene-ethylene random copolymer, soft polypropylene, polypropylene and the like. Propylene polymer, polyolefins such as 4-methylpentene-1, polystyrene, polyester, polyamide,
Any plastic film containing or consisting of a polymer selected from polymer components such as vinyl halide polymers such as polysulfone, polyvinyl chloride, and polyvinylidene chloride can be used. Preferably, an ethylene-based polymer is preferred. The ethylene-based polymer such as low-density polyethylene, high-density polyethylene, and ethylene-α-olefin copolymer used for the plastic film is preferably obtained by polymerization in the presence of a metallocene catalyst.

The plastic film is ethylene-α-
It is preferably a polyethylene film selected from an olefin copolymer and a high-pressure low-density polyethylene. As the plastic film, a polyethylene film containing or consisting of 10 to 100% by weight of an ethylene-α-olefin copolymer and 90 to 0% by weight of a high-pressure low-density polyethylene is preferable. Especially ethylene-
It is preferable that the α-olefin copolymer is an ethylene-α-olefin copolymer produced by a metallocene catalyst.

As the plastic film, a single layer, a double layer, a multilayer film of three or more layers can be used.

Examples of the high-pressure low-density polyethylene include those produced by high-pressure radical polymerization. Examples of the high-pressure low-density polyethylene include a homopolymer of ethylene, and a copolymer with another monomer such as an ethylene-vinyl acetate copolymer. When using an ethylene-vinyl acetate copolymer, the repeating unit derived from vinyl acetate in the copolymer is usually
It is preferably at most 20% by weight.

In the ethylene-α-olefin copolymer, the α-olefin is propylene, butene-
1, 3-pentene-1, hexene-1, 4-methylpentene-1, octene-1, cyclohexene, etc.
Ten α-olefins can be used.

In the ethylene-α-olefin copolymer, the repeating unit derived from the α-olefin in the copolymer of ethylene and α-olefin is usually 30% by weight or less, preferably 25% by weight or less, More preferably, the content is 20% by weight or less. α-olefin is used alone in the ethylene-α-olefin copolymer,
Two or more kinds may be contained.

As the plastic film, one obtained by mixing and kneading the components using various kneaders such as a Banbury mixer, a roll mixer, a kneader, a high-speed rotary mixer and an extruder, preferably a single-screw or twin-screw extruder may be used. I can do it. Further, a material kneaded during inflation molding or T-die molding can be used.

In the method for preventing adhesion and fusion of a rubber veil of the present invention, the embossed plastic film is
Embossed plastic having a value of [(haze)-(internal haze)] of 20% or more, preferably 25% or more, more preferably 30% or more, more preferably 35% or more, and particularly preferably 38% or more. Films are preferred. In particular, in the method for preventing adhesion of the rubber veil of the present invention, the embossed plastic film,
The value of [(haze) − (internal haze)] is 20% to 75.
%, Preferably 25% to 65%, more preferably 30%
% To 60%, more preferably 35% to 55%, particularly preferably 38% to 50%.

The haze of the embossed plastic film is preferably at least 10%, more preferably at least 20%, more preferably at least 30%, particularly preferably at least 40%. In particular, the embossed plastic film preferably has a haze of 10% to 8%.
0%, more preferably 20% to 70%, more preferably 30% to 60%, particularly preferably 40% to 55%.

In the case of a plastic film, the film thickness is preferably in the range of 15 to 300 μm, more preferably in the range of 15 to 200 μm, and particularly preferably 20 to 200 μm.
１５０150 μm.

As a method for obtaining an embossed plastic film, a molding method capable of embossing a known film or a film formed using a molding machine can be used. For example, T-die molding, inflation molding, calender molding After forming a film by a forming method such as molding, it may be formed using an embossing machine equipped with an embossing roll, or T-die forming, calendering, etc. In the method, an embossing roll made of metal or the like may be used for a chill roll (cooling roll) and pressed by a backup roll, so that a film forming and embossing process can be performed simultaneously. The shape of the emboss may be any of a lattice pattern, a crest (pear-skinned) pattern, a trapezoidal pattern, a silk pattern, and an uneven shape.

The plastic film may be used, if necessary,
Lubricants, antiblocking agents, antioxidants, ultraviolet absorbers, heat stabilizers, flame retardants, inorganic and organic fillers, antistatic agents, coloring agents, and the like can be added. Plastic film is made of calcium compound, magnesium compound,
A film made of a composition containing no zinc compound or aluminum compound lubricant can be used.

[0027]

EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.

The properties of the resin material constituting each layer used in the present invention were determined by the following measuring methods. The results are shown in Table 1. (1) Density: 190 in accordance with JIS K7112
° C, melt flow rate (M
FR _2.16 ) The strand obtained at the time of measurement was kept at 100 ° C.
For 1 hour and slowly cooled to room temperature over 1 hour, and measured using a density gradient tube. (2) Melt flow rate (MFR _2.16 ): JIS
In accordance with K7210, the weight of the resin extruded into a strand in 10 minutes under a load of 2.16 Kg at 190 ° C. using a melt indexer was determined.

The method for measuring the characteristic values of the films obtained in Examples and Comparative Examples will be described. (1) Haze measurement method: The haze of the sample film was evaluated in accordance with JIS K7105. The internal haze of the sample film was evaluated according to JIS K7105 after applying silicone oil to the embossed film.

(2) Storage test: 335 mm × 670 mm
A package is prepared in which a surface of a synthetic polybutadiene rubber having a rectangular parallelepiped shape of 210 mm is covered with a plastic film.
The packages are stacked in six rows and five columns vertically (a total of 30 pieces are one case), and after storing in a warehouse (about 30 ° C.) for one month, the adhesion between the packages and the state of collapse of the packages are visually observed. . ：: No close contact between the packages is observed, and no collapse of the package is observed. ×: Close contact between the packages is observed, or collapse of the package is observed.

[Examples 1 to 4] By using an ethylene polymer shown in Table 1 and using an embossing roll as a cooling roll on a T-die molding machine manufactured by Modern Machinery,
An embossed film having the film weight shown in Table 1 was obtained.
The resulting embossed film was evaluated for haze, internal haze, and storage test, and the results are shown in Table 1.

Comparative Example 1 Using an ethylene polymer shown in Table 1, a T-die molding machine manufactured by Modern Machinery Co., Ltd.
Unembossed films having the film weights shown in Table 1 were obtained. The obtained film was evaluated for haze, internal haze and storage test, and the results are shown in Table 1.

[0033]

[Table 1]

[0034]

According to the present invention, the applied lubricant adheres to the operator's hand without deteriorating the working environment due to the scattering of fine powder of the lubricant at the site where the synthetic rubber is manufactured and where it is used. Thus, it is possible to provide a method for preventing adhesion of a rubber veil, which is characterized in that a rubber veil is packaged with an embossed plastic film without preventing slippage and deterioration in handleability of the rubber veil.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI theme coat ゛ (reference) C08L 23:00 C08L 23:00 F-term (reference) 3E086 AB01 AD13 BA02 BA15 BA44 BB59 CA40 4F071 AA15 AH19 BA01 BB04 BB06 BB09 BC01 4F209 AA04 AF01 AG01 AG05 PA01 PB02 PW41

Claims (4)

[Claims] 1. A method for preventing adhesion of a rubber veil, comprising packaging the rubber veil with an embossed plastic film. 2. The embossed plastic film according to claim 1, wherein the value of [(haze)-(internal haze)] is 20% or more. Rubber veil adhesion prevention method. 3. The method according to claim 1, wherein the plastic film is ethylene-α-
The method for preventing adhesion of a rubber veil according to any one of claims 1 to 2, wherein the method is a polyethylene-based film selected from an olefin copolymer and a high-pressure low-density polyethylene. 4. The method for preventing adhesion of a rubber veil according to claim 3, wherein the ethylene-α-olefin copolymer is an ethylene-α-olefin copolymer produced by using a metallocene catalyst.