CN100360324C - A kind of transfer film and its production process - Google Patents

Abstract

The invention provides a transfer film and its production process. The carrier film of the transfer film is provided with a release layer and a graphic layer in sequence. The release layer is closely combined with the carrier film. The graphic layer is decorative, wear-resistant and weather-resistant. Integrate anti-corrosion and heat-sensitive adhesion; during production, corona treatment is first performed on the carrier film to make the surface tension reach more than 500μN/cm, and then a layer of release layer is coated or printed on the corona surface of the carrier film, Print the desired graphic layer on the release layer. Since the release layer is closely combined with the carrier film and does not transfer to the surface of the product along with the graphic layer, only the graphic layer is transferred during transfer printing, so that the part of the product surface other than the graphic layer will not appear transfer bright marks and The bright marks of glue maintain the original luster of the product, making the product appearance more beautiful and more decorative.

Description

A kind of transfer film and its production process

technical field

The invention relates to a plastic hot-press transfer film and a production process thereof.

Background technique

Existing hot press transfer film is composed of carrier film, release layer, protective layer, graphic layer, and heat-sensitive adhesive layer. Remove the detachment layer. Under the action of heat or pressure, all coatings on the heat press transfer film except the carrier film can firmly adhere to the surface of the plastic product, and it is a printing film with certain functions. Chinese patent CN1175979C discloses a production process of a transfer film: according to the size of the image and text range or the size of the transferred surface of the transfer body, a transparent or translucent protective layer is printed at a certain distance by a printing machine. Print a layer of required graphics on the protective layer, and print a heat-sensitive adhesive layer with a size corresponding to the protective layer on the graphic layer and play a bonding role. Before printing the protective layer, it can be printed on the carrier film Coated or printed with a release layer that can be released from the carrier film.

Due to the influence of the performance of the multi-layer coating material, the transfer film produced by the above process will have some quality problems during the transfer process, that is, the surface of the product after transfer will leave transfer bright marks and glue bright marks, especially This phenomenon is even more serious when the original surface gloss of the product is poor. This is caused by the limitations of the existing gravure printing equipment, which cannot achieve the size of the protective layer and the adhesive layer to be consistent with the size of the graphic and text during coating or gravure printing, but only slightly larger than the size of the graphic and text. The transfer bright marks and glue bright marks are caused by the size of the protective layer and the adhesive layer being slightly larger than the graphic. Especially in the case of small-area patterns and texts, if some patterns or texts are only 1-2mm or even smaller, so that the bright marks after transfer are larger than the pictures and texts, which seriously affect the appearance quality of the transferred products .

Contents of the invention

The present invention aims to provide a transfer film which does not leave transfer bright marks and glue bright marks on the product surface after transfer printing.

Another object of the present invention is to provide a production process for the transfer film.

The present invention is based on such a design idea: the protective layer, the graphic layer and the heat-sensitive adhesive layer are fused into one layer, that is, the graphic layer has multiple functions: 1) it is protective, and it can provide the required Wear resistance and weather resistance; 2) Decorative and good printability; 3) Heat-sensitive adhesion, which can be quickly separated from the release layer and adhere to the surface of the product under the action of heat or pressure. The release layer must be closely combined with the carrier film, and it will not be transferred to the surface of the product along with the graphic layer.

The technical scheme adopted in the present invention is: a transfer film, the carrier film is provided with a release layer, a graphic layer in sequence, and the release layer is closely combined with the carrier film; the main component of the release layer is mineral wax or synthetic wax or such A mixture of two waxes, or solvent-based silicone; the formula of each color ink in the graphic layer and its weight percentage in the total components are: polyacrylate copolymer resin 17% ~ 24%, pigment 7% ~ 29%, synthetic wax 0.5%-1.5%, toluene 30%-55%, butyl acetate 15%-30%, dispersant 0-0.7%.

The dispersant is an anionic surfactant whose main component is phosphate ester.

The production process of the transfer film includes the following steps in turn:

(1) Corona treatment is carried out on the carrier film to make the surface tension reach more than 500 μN/cm;

(2) Coating or printing a layer of release layer on the corona surface of the carrier film;

(3) Print the desired graphic layer on the release layer.

The main formula of each color ink in the graphic layer in the above step (3) and the weight percentage of the total components are: polyacrylate copolymer resin 17%～24%, pigment 7%～29%, synthetic wax 0.5% ～1.5%, toluene 30%～55%, butyl acetate 15%～30%, dispersant 0～0.7%.

The main component of the release layer in the above step (2) is mineral wax or synthetic wax or a mixture of these two waxes, and can also be solvent-based silicone.

In the step (3), the dispersant is an anionic surfactant, and the main component is phosphoric acid ester.

The invention creatively integrates the protective layer, graphic layer and heat-sensitive adhesive layer into one layer. The graphic layer integrates decoration, wear resistance and weather resistance, and heat-sensitive adhesion. (1) The polyacrylate copolymer resin acts as an adhesive, and acts as a heat-sensitive adhesive during transfer printing, so that the graphic layer can be firmly attached to the surface of the plastic product during transfer printing; in addition, the polyacrylate copolymer resin The resin has good compatibility with other components in the formula, and the pigment can be uniformly dispersed in it, so the printing effect is good; (2) the synthetic wax provides the required wear resistance and weather resistance; (3) the dispersant makes the pigment more uniform (4) Toluene and butyl acetate act as solvents. The produced transfer film is composed of a carrier film, a release layer, and a graphic layer. After corona treatment, many tiny pores will be formed on the surface of the carrier film, so that the subsequent printed release layer can be tightly combined with it. It will be transferred to the surface of the product along with the graphic layer, so only the graphic layer is transferred during transfer printing, so that there will be no transfer bright marks and glue bright marks on the surface of the product except the graphic layer, and the original product will be maintained. Some luster makes the appearance of the product more beautiful and more decorative. In addition, since the transfer film has only a release layer and a graphic layer, when the color number of the printed pattern is the same as the maximum color number that the printing machine can provide, the method of the present invention can still be printed with the original printing machine. However, the transfer film produced by the existing process has a protective layer and a heat-sensitive adhesive layer besides the release layer and the graphic layer on the carrier film. In this way, the printing machine can only print the maximum amount of material that the printing machine can provide. A pattern of two colors with fewer colors. Simultaneously, adopting the present invention also simplifies the production procedure and improves the production efficiency.

Description of drawings

Figure 1 is a schematic diagram of the structure of the transfer film.

Detailed ways

Example 1, as shown in FIG. 1 , the bottom layer of the transfer film is a PET carrier film 1 , the second layer is a release layer 2 , and the third layer is a graphic layer 3 .

The formula (by weight ratio) of breaking away from layer 2 is :

Water-soluble mineral wax: 2-6%

Water and alcohol in a ratio of 1:1: 94-98%

Mineral waxes are montan wax, montan wax and the like. If it is an oil-soluble mineral wax, then 20 grams of mineral wax is dissolved in a mixed solution of 5 kilograms of toluene and methyl ethyl ketone, each of which accounts for 50% of the ratio in the mixed solution.

The formula (by weight ratio) of a kind of color ink in graphic layer 3 is:

Polyacrylate copolymer resin produced by Degussa, Germany: 17%

Pigment: 7%

Phosphate lipid anionic surfactant: 0.5%

Polyethylene wax produced by the American Sanye SHAMROCK company: 1%

Toluene: 49.5%

Butyl acetate: 25%

The above components are mixed and put into a grinder to grind to a fineness of 10 μm.

Embodiment 2, the formula (by weight ratio) of release layer 2 also can be:

Solvent-based silicone produced by RHOdia, Germany: 100 parts

Catalyst produced by RHOdia, Germany: 1.2 parts

Dilute the organic silicon and catalyst to 6-8 times with 120# gasoline.

Embodiment 3, also can use synthetic wax (such as polyethylene wax, polypropylene wax etc.) to replace mineral wax in the prescription of release layer 2, also can mix mineral wax and synthetic wax together and use.

The production process is as follows: (1) Corona treatment is first performed on the carrier film to make the surface tension reach more than 500μN/cm, so that many tiny pores will be formed on the surface of the carrier film, so that the printability of the carrier film surface is good; (2) On the corona surface of the carrier film, use a coater to coat or print a layer of release layer with a printing machine. The release layer can be closely combined with the carrier film, and it is easy to bond with the carrier film under the action of heat or pressure. The graphic layer is detached and does not transfer to the surface of the product with the graphic layer; (3) Print the required graphic layer on the release layer. This graphic layer integrates decoration, wear resistance and weather resistance, and heat-sensitive adhesion. One.

Claims (5)

1, a kind of transfer film is characterized in that: be provided with abscission layer, picture and text layer on its film carrier successively, abscission layer and film carrier are combined closely; The main component of abscission layer is the mixture of mineral wax or synthetic wax or these two kinds of waxes, also can be solvent-type organosilicon; The prescription of every kind of color ink and the percentage by weight that accounts for total component thereof are in the picture and text layer: polyacrylate copolymer resins 1 7%～24%, pigment 7%～29%, synthetic wax 0.5%～1.5%, toluene 30%～55%, butyl acetate 1 5%～30%, dispersant 0～0.7%.

2, transfer film according to claim 1 is characterized in that: described dispersant is an anion surfactant, and Main Ingredients and Appearance is a phosphoric acid fat.

3, a kind of production technology of transfer film is characterized in that in turn including the following steps:

(1) film carrier is carried out sided corona treatment, its surface tension is reached more than the 500 μ N/cm;

(2) on the corona surface of film carrier, be coated with or stamp one deck abscission layer;

(3) on abscission layer, stamp required picture and text layer, the main prescription of every kind of color ink and the percentage by weight that accounts for total component thereof are in the picture and text layer: polyacrylate copolymer resins 17%～24%, pigment 7%～29%, synthetic wax 0.5%～1.5%, toluene 30%～55%, butyl acetate 15%～30%, dispersant 0～0.7%.

4, production technology according to claim 3 is characterized in that: the main component of abscission layer is the mixture of mineral wax or synthetic wax or these two kinds of waxes in the step (2), also can be solvent-type organosilicon.

5, according to claim 3 or 4 described production technologies, it is characterized in that: described dispersant is an anion surfactant, and Main Ingredients and Appearance is a phosphoric acid fat.

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