JPH03182577A - Surface covering material - Google Patents

Abstract

PURPOSE:To obtain a surface covering material which can prevent a self-adhesive layer from being separated from a base material and transferred to a surface of an object when it is used to stick to a surface of an object and then peeled by applying an emulsified self-adhesive having a water-soluble proteinaceous polymer incorporated therein to one side of a base material comprising a polyolefin and drying it to form a self-adhesive layer thereon. CONSTITUTION:This surface covering material is prepared by applying an emulsified self-adhesive having a water-soluble proteinaceous polymer incorporated therein to one side of a base material comprising a polyolefin and drying it to form a self-adhesive layer thereon. As the emulsified self-adhesive, a natural or synthetic rubber latex or synthetic resin emulsion which shows self- adhesiveness at ordinary temperature is used. Examples of the water-soluble proteinaceous polymer include glue, casein, and albumin. The amount of the water-soluble proteinaceous polymer to be incorporated into the self-adhesive is usually about 0.1-30wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface coating material used for masking materials, packaging materials, etc.

[Background of the invention]

This type of surface covering material such as masking materials and packaging materials is made by providing an adhesive layer on the surface of a base material such as paper or plastic sheet, and is pasted onto the surface of the masking object, packaging object, etc. via the adhesive layer. It is then peeled off after surface treatment, transportation, etc. During peeling, it is required that the adhesive layer does not peel off from the base material and transfer to the surface of the object. However, if the base material is made of plastic with low affinity for the adhesive layer, such as polyolefin such as polyethylene or polypropylene, or if the target surface of the adhesive layer is exposed to high temperatures during surface treatment or after long-term storage or transportation, It is extremely difficult to prevent this transition.

[Conventional technology]

Conventionally, methods to prevent such migration of the adhesive layer to the target surface include creating a slightly crosslinked structure in the adhesive layer to improve cohesive strength, or adding a release agent to impart release properties. was being carried out.

[Problem to be solved by the invention]

However, in the method of making the adhesive layer into a slightly crosslinked structure, the adjustment of the crosslinking density is extremely delicate, and if the crosslinking density is slightly higher than the appropriate crosslinking density, the adhesiveness will be extremely reduced, and conversely, if it is slightly lower than the appropriate crosslinking density, the cohesive force will not improve and the target surface It is not possible to prevent the transfer of the adhesive layer to the adhesive layer, and the method of adding an Ill-type agent causes a decrease in adhesiveness, and a decrease in heat resistance and weather resistance.

In particular, when the base material is polyolefin such as polyethylene or polypropylene, conventional methods such as forming a slightly crosslinked structure or adding a release agent cannot completely prevent the adhesive layer from transferring to the target surface. Can not. However, polyolefin has solvent resistance and is inexpensive, making it a preferred material as a base material for masking materials.

[Means to solve the problem]

The present invention, as a means for solving the above-mentioned conventional problems,
A protein-based water-soluble polymer is added to the adhesive layer.

The base material used in the present invention is polyethylene, polypropylene,
The material is polyolefin such as ethylene-propylene copolymer. The base material may be formed into a shape that matches the surface shape of the object to be coated.

An inorganic filler may be mixed in the polyolefin sheet or polyolefin foam sheet. The inorganic filler mixed in the polyolefin sheet or polyolefin foam sheet includes calcium carbonate,
Inorganic powders such as talc, bentonite, titanium white, carbon black, red iron, glass powder, ceramic powder, blast furnace slag, and fly ash. The inorganic filler is usually added to the polyolefin sheet or polyolefin foam sheet in an amount of 5 to 80% by weight, preferably 10 to 60% by weight.
About % by weight is mixed. Mixing an inorganic filler into a polyolefin sheet or a polyolefin foam sheet in this way improves the strength and heat resistance of the masking material, and also allows polyolefin materials or polyolefin foam materials to be mixed with segmented inorganic fillers. This reduces the cost of masking materials. Furthermore, when incinerating the masking material after use, the combustion energy is reduced by the amount of inorganic filler added, and damage to the incinerator is reduced accordingly.

The adhesive used in the present invention is of an emulsion type in order to uniformly mix the protein-based water-soluble polymer. Examples of such adhesives include natural rubber, styrene-butadiene rubber, and styrene-butadiene block. Polymers, styrene-isoprene block copolymers, acrylonitrile-butadiene rubber, isoprene rubber, chloroprene rubber, butyl rubber, polyisobutylene rubber, polybutene rubber.

natural or synthetic rubber latex, such as grafted rubber;
Acrylic acid ester resin, methacrylic acid ester resin, vinyl acetate resin, vinyl propionate resin, vinyl acetate-ethylene copolymer resin, vinyl acetate-maleic acid copolymer resin.

Synthetic resin emulsions such as styrene resins, vinyl chloride resins, vinyl chloride-ethylene copolymer resins, vinyl chloride-vinyl acetate copolymer resins, vinylidene chloride resins, polyvinyl ether resins, etc., and are sticky at room temperature. The one shown is used.

Two or more of the above synthetic rubber latexes and synthetic resin emulsions may be mixed, and in that case, it is sufficient that the mixture exhibits tackiness at room temperature.1 Each individual latex or emulsion does not necessarily need to show tackiness at room temperature. In addition, plasticizers or softeners such as dibutyl phthalate, dioctyl phthalate, tricresyl phosphate, terpene dimers, etc. may be added to the latex or emulsion; It is not necessary for each latex or emulsion to exhibit tackiness at room temperature, as long as it shows tackiness at room temperature.

Furthermore, the adhesive of the present invention includes tackifiers such as rosin, petroleum resin, coumaron resin, rosin derivative, terpene resin, phenol resin, alkylphenol resin, toluene, xylene, ethyl acetate, n-butyl acetate, 7-methyl ethyl ketone. , methyl isobutyl ketone, cellosolve acetate, n-butyl cellosolve, ethylene glycol,
Organic solvents or wetting agents such as diethylene glycol, propylene glycol, glycerin, polyethylene glycol, polypropylene glycol, fillers such as talc, bentonite, calcium carbonate, etc. may be added.
In addition, pigments, dyes, fungicides, preservatives, etc. may be added.

Examples of the protein-based water-soluble polymer used in the present invention include glue, gelatin, casein, and albumin.

The amount of the water-soluble protein polymer added to the adhesive is usually 0.1 to 30% by weight (hereinafter simply referred to as %), preferably 0.1 to 20%. If the amount of the above-mentioned water-soluble protein-based polymer added exceeds 30%, the tackiness tends to decrease, but for adhesives with sufficient tackiness, the amount of water-soluble protein-based polymer added exceeds 30%. In some cases, the adhesiveness may not decrease even if the amount of water-soluble protein-based polymer added is 0.
When the amount is less than 1%, the effect of preventing the adhesive layer from transferring to the object decreases. The above protein-based water-soluble polymer is usually added to the emulsion-type adhesive later, but it may be added to the aqueous phase in advance during the production of the adhesive emulsion (emulsion polymerization or emulsification of resin etc.). The water-soluble protein polymer may be added in a solid form such as a powder or in a solution such as an aqueous solution.

To manufacture the surface coating material of the present invention, a mixture of the adhesive emulsion and the above protein-based water-soluble polymer is applied to the object contacting surface of the base material.

If desired, an adhesive layer is formed by drying by heating at 80° C. or higher or by heating at 80° C. or higher after drying at room temperature. Adhesive layer is usually 50-300 g/m
It is formed on the base material with a weight of about 1.

The surface of the base material may be subjected to electrical discharge treatment or primer treatment prior to application of the adhesive emulsion.

[Effect]

The effects of the present invention are as follows.

A protein-based water-soluble polymer is mixed into an adhesive to improve the cohesiveness of the adhesive and to impart mold releasability. Protein-based water-soluble polymers do not easily soften even at high temperatures.

〔Effect of the invention〕

Therefore, even if the surface coating material of the present invention is made of polyolefin as a base material, it will stick to the surface of the object, and even if it is exposed to high temperatures in this state and even after a long period of time, when the surface coating material is peeled off, The adhesive layer does not migrate from the base material to the surface of the object, and peeling of the coating material from the base material due to softening of the adhesive at high temperatures can be prevented. In addition, regardless of the surface temperature of the object when it is pasted, it has good adhesion and does not peel off during storage, and when the surface coating material is peeled off, it easily peels off from the base material of the adhesive layer to the surface of the object. No transition is seen.

〔Example〕

Example 1 A plate-shaped adhesive emulsion consisting of 70 parts by weight of 50% natural rubber latex and 30 parts by weight of an emulsion of 50% terpene resin was added with a protein-based water-soluble polymer at the ratio shown in Table 1. 5 on one side of the polyethylene sheet
A surface coating material was prepared by coating at 0 g/rrf and drying.

The test results for the surface coating material are shown in Table 2.

(Units: Table 2 (1) Adhesive force and peel strength: A surface coating material is attached to a painted board through the adhesive coated surface, and the 180 degree peel strength at 20°C after 1 day is measured. Measure.

(2) Adhesive persistence: A surface coating material is attached to a painted board through the adhesive-applied surface, and it is left at 20°C for 1 and 30 days, then peeled off and whether or not the adhesive has migrated to the painted board. I looked into it.

(3> Adhesive persistence when heated = (2) Similar to adhesive persistence, apply the surface coating material to the painted board, leave it for 1 hour at 80°C after 1 day, and stick to the painted board at 80°C. The presence or absence of migration of the agent was investigated.

O No O Slightly present Δ Very present
00 parts by weight and a protein-based water-soluble polymer added in the ratio shown in Table 3 was coated on one side of a plate-shaped polypropylene sheet at 50 g/rrf and dried to prepare a surface coating material. The test results for the surface coating material are shown in Table 4.

(Unit Double Electricity Table 4 Table 4 (4) Adhesive Peel Strength Adhere the surface coating material to the aluminum plate through the adhesive coated surface, and measure the 180 degree peel strength at 20°C one day later. .

(5) Adhesive Residue A surface coating material is attached to the aluminum plate through the adhesive-coated surface, and after being left at 20°C for 1 day and 30 days, it is peeled off to check whether or not the adhesive has migrated to the aluminum plate. Examined.

(6) Adhesive persistence when heated: Similar to (5) Adhesive persistence, the surface coating material was attached to the painted board, and after one day it was left at 80℃ for 1 hour, and the adhesion to the aluminum plate at 80℃ The presence or absence of migration of the agent was investigated.

・ None 0 Slightly 0 Slightly Δ Quite a bit X Almost always Example 3 50 parts by weight of ethyl acrylate and 50 parts by weight of methyl methacrylate
A 51% adhesive emulsion was obtained by adding 10 parts by weight of a 60% gin emulsion to 90 parts by weight of a 50% adhesive emulsion prepared with a monomer ratio of 1 part by weight. To 100 parts by weight of this adhesive emulsion, a protein-based water-soluble polymer was added in the ratio shown in Table 5, and 50g/g of this was added to one side of a polypropylene sheet mixed with 30% by weight of calcium carbonate.
A surface coating material was created by applying it with a spray bottle and drying it. The test results for the surface coating material are shown in Table 6.

(Unit: Table 6 (7) Adhesive force Peel strength: The surface coating material is pasted on the painted board through the adhesive coated surface, and the 180 degree peel strength at 20°C after 1 day is measured. Measure.

(8) Adhesive persistence: Affix the surface coating material to the painted board through the adhesive-applied surface, leave it at 20°C for 1 day and 30 days, then peel it off and check whether the adhesive has migrated to the painted board. I looked into it.

(9) Adhesive persistence when heated = (8) Adhesion of the surface coating material to the painted board in the same way as for (8) Adhesive persistence, and after 1 day, left at 80°C for 1 hour, and the adhesion to the painted board at 80°C The presence or absence of migration of the agent was investigated.

O No O Slightly present Δ Very much × Mostly present Example 4 100 parts by weight of a 51.9% adhesive emulsion consisting of 3 parts by weight of talc and 1 part by weight of polypropylene glycol to 100 parts by weight of 50% butyl rubber latex. On the other hand, a protein-based water-soluble polymer was added at the ratio shown in Table 7 to one side of the polypropylene sheet of Example 3 at a rate of 100 g/rr.
A surface coating material was prepared by coating with r and drying. The test results for the surface coating material are shown in Table 8.

(Unit: Weight system Table 8 (10) Residuality of adhesive after heat aging: A surface coating material is attached to a painted board through the adhesive coated surface, and then heat aged at 40°C for 1 day. After 1 month, 3 months, and 6 months, the adhesive was peeled off and the presence or absence of transfer of the adhesive to the painted board was examined.

No O O slightly Δ Quite a bit × is almost always

Claims (1)

[Claims] A surface coating material characterized in that an adhesive layer is formed by applying an emulsion type adhesive containing a protein-based water-soluble polymer to one surface of a base material made of polyolefin and drying it.