TWI535799B - A water-based primer composition for pvc pressure-sensitive adhesive tape - Google Patents

Description

Aqueous primer composition for polyvinyl chloride pressure sensitive tape

The present invention relates to a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape, which is used as a construction tape, a protective tape or an electrical insulation tape.

Polyvinyl chloride pressure-sensitive adhesive tape has the characteristics of softness, stretchability, flame retardancy, electrical edge and heat deformation resistance. The applicable industries are quite wide, such as: in the construction industry as the ground, wall and roof. The plate is fixed for use. It can also be used as a material to protect stainless steel plates, aluminum plates and acrylic sheets to prevent wear and reduce the loss of articles and increase the value of articles. It can also be used as an electrical insulating tape for home appliances and automobiles.

At present, most of the adhesives of PVC pressure-sensitive adhesive tape are solvent-based rubber-based pressure-sensitive adhesives, and the adhesion between PVC film and pressure-sensitive adhesive is poor, usually in polyvinyl chloride film substrate and pressure sensitive adhesive. A layer of primer is applied to provide good adhesion, which is convenient for the normal use of vinyl chloride pressure sensitive tape.

The primers for industrial polyvinyl chloride film substrates are all organic solvent type. When the primer is coated and produced, the organic solvent is volatilized into the air, which is not only harmful to human health, but also causes serious pollution to the natural environment. Therefore, the present invention has developed a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape, which is an environmentally-friendly water-based primer which is friendly to the human body and the natural environment.

The present invention relates to a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape, which is used as a construction tape, a protective tape or an electrical insulation tape.

The invention relates to a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape comprising: (a) a polymer emulsion of natural rubber grafted methyl methacrylate of 20 to 75 phr; (b) a neoprene emulsion (chloroprene) Rubber latex) 25~80phr; here phr is the abbreviation of parts per hundreds, which means the amount per 100 parts by weight.

The polymer emulsion of (a) natural rubber grafted methyl methacrylate used in the invention is a graft polymer of natural rubber and methyl methacrylate, and the graft ratio is 10% to 50%, natural rubber. The polymer emulsion of grafted methyl methacrylate includes Gapoly-10, Gapoly-20, Gapoly-30 or Gapoly-49HS products (products of New Jincheng Co., Ltd.), which are used in an amount of 20 to 75 phr. The polymer emulsion of natural rubber grafted methyl methacrylate is preferably used in an amount of 30 to 60 phr.

The (b) chloroprene rubber emulsion used in the present invention includes SND57, SD78, 671A, 752, 400 or 571 products (product of Showa Denko, Japan), which is used in an amount of 25 to 80 phr. The amount of the neoprene emulsion used is preferably from 30 to 65 phr.

The invention relates to a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape, the purpose of which is to provide a good adhesion between a polyvinyl chloride film substrate (PVC) and a pressure sensitive adhesive, that is, The performance evaluation results of the PVC pressure-sensitive adhesive tape were 4-5 times, the slow peeling and the quick peeling test. The back of the tape was observed without degumming and no residue.

In the above aqueous primer composition of the polyvinyl chloride pressure-sensitive adhesive tape, if necessary, add wet The sizing agent and defoaming agent can make the surface coating performance and adhesion of the primer coating better.

The following examples are illustrative of a waterborne primer composition for a polyvinyl chloride pressure-sensitive adhesive tape of the present invention and are not intended to limit the scope of the present invention.

[Example 1]

First, 100 g (g) of natural rubber grafted methyl methacrylate polymer emulsion Gapoly-49HS product (new Jincheng Co., Ltd. product), and 100 g of chloroprene rubber emulsion 671A product (product of Japan Showa Denko) Pour into a container, stir at room temperature for 30 minutes, filter with a 100 mesh filter, and adjust to pH 7.0 with ammonia water to become a water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape. The product has a solids content of 12% and a viscosity of 40 cps.

[Example 2]

First, 100g of natural rubber grafted methyl methacrylate polymer emulsion 100g Gapoly-30 product (new Jincheng Co., Ltd. product), and 100g neoprene emulsion SD78 product (product of Japan Showa Denko) are poured into the container. After stirring at room temperature for 30 minutes, it was filtered through a 100 mesh filter and adjusted to pH 7.0 with ammonia water to become a water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape; the solid content of the product It is 12% and the viscosity is 30 cps.

[Example 3]

First, 100g of natural rubber grafted with methyl methacrylate polymer emulsion 100g Gapoly-30 product (product of New Jincheng Co., Ltd.), and 100g neoprene emulsion SND57 product (product of Showa Denko, Japan) were poured into a container, stirred at room temperature for 30 minutes, and filtered through a 100 mesh filter. It was adjusted to pH 7.0 with ammonia water, which became a water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape; the product had a solid content of 12% and a viscosity of 45 cps.

[Embodiment 4]

First, 100g of natural rubber grafted methyl methacrylate polymer emulsion 100g Gapoly-20 product (new Jincheng Co., Ltd. product), and 100g neoprene emulsion 571 product (product of Japan Showa Denko company) are poured into the container together. After stirring at room temperature for 30 minutes, it was filtered through a 100 mesh filter and adjusted to pH 7.0 with ammonia water to become a water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape; the solid content of the product It is 12% and the viscosity is 50 cps.

[Comparative Example 1]

First, 200 g (g) of natural rubber grafted methyl methacrylate polymer emulsion Gapoly-49HS product (new Jincheng Co., Ltd. product) was poured into a container, stirred at room temperature for 30 minutes, and then filtered through a mesh of 100 mesh. After filtration, the pH was adjusted to 7.0 using ammonia water, which became a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape; the product had a solid content of 12% and a viscosity of 50 cps.

[Comparative Example 2]

First, 200g of natural rubber grafted methyl methacrylate polymer emulsion 100g Gapoly-30 product (product of New Jincheng Co., Ltd.) was poured into a container, stirred at room temperature for 30 minutes, and then filtered through a 100 mesh filter. Adjust it to a pH of 7.0 using ammonia water, which becomes a A water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape; the product has a solid content of 12% and a viscosity of 35 cps.

[Comparative Example 3]

First, 200 g of neoprene emulsion SND57 product (product of Showa Denko, Japan) was poured into a container, stirred at room temperature for 30 minutes, filtered through a 100 mesh filter, and adjusted to pH 7.0 with ammonia water. A water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape; the product has a solid content of 12% and a viscosity of 45 cps.

[Comparative Example 4]

First, 200 g of neoprene emulsion 571 product (product of Showa Denko, Japan) was poured into a container, stirred at room temperature for 30 minutes, filtered through a 100 mesh filter, and adjusted to pH 7.0 with ammonia water. A water-based primer composition for polyvinyl chloride pressure-sensitive adhesive tape; the product has a solid content of 12% and a viscosity of 60 cps.

[Comparative Example 5]

A solvent-based primer for polyvinyl chloride pressure-sensitive adhesive tape commercially available from Company A has a solid content of 10% and a viscosity of 60 cps.

Comparing Embodiments 1 to 4 of the present invention with Comparative Examples 1 to 6, the following Table 1 shows the following.

Note: ⁽¹⁾ PM late: polymer emulsion of natural rubber grafted methyl methacrylate.

Note: ⁽²⁾ CR latex: neoprene emulsion.

【testing method】

Solid content (%): A small amount of the emulsion was placed in an aluminum pan, placed in an oven at 120 ° C / 1 hour, and taken out and placed at a constant temperature. Solid form calculation formula: (weight after drying / weight before drying) × 100%.

Viscosity: The viscosity of the emulsion was tested using a Brookfield VLE rotary viscometer and the needle/speed was 63#/30 rpm at room temperature in units of cps.

pH: pH detector.

Adhesive coating surface properties: The polyvinyl chloride film is cut into A4 size and an appropriate amount of primer is applied, coated by wire bar coating and placed in an oven at 80 ° C for 1 minute, and the coating dry amount is 5-7 g / In square meters, the room surface was observed and the coated surface was observed and recorded.

Thereafter, a solvent-type rubber-based pressure sensitive adhesive is applied on the primer layer, and the coating dry amount is 20 micrometers (μm), and is made into a polyvinyl chloride pressure-sensitive adhesive tape. After being aged at 75 ° C for 8 hours, the room temperature is set. , perform primer testing and evaluation.

Adhesive face adhesion test: Polyvinyl chloride pressure sensitive tape is glued to the adhesive surface, and the number of tackiness before degumming is recorded. 4-5 times is excellent, 2-3 times is acceptable, and 1 time is poor.

Slow peel test: Polyvinyl chloride pressure sensitive tape was tested at a speed of 300 mm/min (mm/min) to observe the back of the tape:

(○) means no degumming and no residue (good condition)

(x) indicates complete degumming (bad condition)

The PVC pressure-sensitive adhesive tape was tested at a speed of 300 m/min (m/min) to observe the back of the tape:

(○) means no degumming and no residue (good condition)

(x) indicates complete degumming (bad condition)

The basic physical properties of the primers of Examples 1 to 4 and Comparative Examples 1 to 5 of the present invention are shown in Table 2 below.

The performance evaluations of the primers of Examples 1 to 4 and Comparative Examples 1 to 5 of the present invention are shown in Table 3 below.

It can be seen from the comparison results of the above-mentioned three primer performance evaluation that the polyvinyl chloride pressure-sensitive adhesive tape obtained in the first to fourth embodiments of the present invention has good primer property, and the rubber has more adhesive faces, slow peeling and rapid peeling without degumming. And no residue; and compared with the products obtained in Examples 1 to 4, the glue faces less adhesive, and the slow peeling and rapid peeling have poor degumming. Comparative Example 5 is a commercially available product which is an organic solvent type primer which is not friendly to the human body and the natural environment.

It can be seen that the present invention is a water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape, which is an environmentally-friendly water-based primer, which is friendly to the factory production staff, consumer health, and the natural environment. Industrial use, and meet the patent requirements of the invention.

Claims (5)

A water-based primer composition for a polyvinyl chloride pressure-sensitive adhesive tape, comprising: The polymer emulsion of natural rubber grafted methyl methacrylate is composed of natural rubber and 10%~50% methyl methacrylate graft polymer; wherein phr is an abbreviation of parts per hundreds, indicating the dosage per hundred. By weight. The aqueous primer composition for a polyvinyl chloride pressure sensitive adhesive tape according to claim 1, wherein the natural rubber grafted methyl methacrylate polymer emulsion is used in an amount of 30 to 60 phr, and the amount of the neoprene emulsion is used. 30~65phr, which is better. The aqueous primer composition for a polyvinyl chloride pressure-sensitive adhesive tape according to claim 1, wherein the polymer emulsion of the natural rubber grafted methyl methacrylate is Gapoly-10, Gapoly-20, Gapoly-30 or Gapoly -49HS products (new Jincheng Co., Ltd. products). The aqueous primer composition for a polyvinyl chloride pressure-sensitive adhesive tape according to claim 1, wherein the neoprene emulsion is a SND57, SD78, 671A, 752, 400 or 571 product (product of Showa Denko Co., Japan). The aqueous primer composition for a polyvinyl chloride pressure-sensitive adhesive tape according to any one of claims 1 to 4, which is used as a construction tape, a protective tape or an electrical insulation tape.