PET film with coating layer and high ink adhesive force and preparation method thereof

An adhesion and film technology, applied in coatings, polyester coatings, etc., to achieve the effects of strong ink adhesion, poor adhesion, and simple production process

Pending Publication Date: 2020-12-11
安徽省长荣新材料科技有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problem of ink adhesion fastness during PET surface printing, and discloses a PET film with high ink adhesion and a preparation method thereof. The product of the present i...
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Abstract

The invention relates to a PET film with a coating layer and high ink adhesive force and a preparation method thereof; the PET film comprises a PET film casting piece, corona layers are arranged on the inner and outer surfaces of the PET film casting piece, a coating liquid is uniformly arranged on the corona layer on one side surface of the inner and outer surfaces, and the coating liquid is cured to form a chemical treatment layer; the coating liquid comprises the following components in parts by mass: 80-90 parts of distilled water, 7-20 parts of polymethyl methacrylate (PMMA) slurry, 1-6 parts of water-soluble copolyester, 2-10 parts of a leveling agent and 3-10 parts of a defoamer. According to the product, the binding force is increased through the chemical coating layer instead of surface tension, and thus the phenomenon that the binding force of the ink is reduced due to corona attenuation can be avoided. The preparation method disclosed by the invention is a manufacturing method of the coating polyester film capable of enhancing the UV printing binding force.

Application Domain

Polyester coatings

Technology Topic

Thin membraneMethacrylate methyl +9

Image

  • PET film with coating layer and high ink adhesive force and preparation method thereof
  • PET film with coating layer and high ink adhesive force and preparation method thereof
  • PET film with coating layer and high ink adhesive force and preparation method thereof

Examples

  • Experimental program(5)

Example Embodiment

[0029] A preparation method of a coated high ink adhesion PET film of the present invention comprises the following steps:
[0030] Step 1): configure the coating (that is, the aforementioned coating liquid);
[0031] Step 2): PET film casting treatment;
[0032] Step 3): coating;
[0033] Step 4): drying and curing;
[0034] Step 5): (PET film casting) non-coated surface corona treatment;
[0035] The coating solution prepared in step 1) includes the following parts by mass and a preparation process: distilled water (80-90 parts) is used as a solvent, and 7-20 parts of polymethyl methacrylate (PMMA) slurry, water-soluble, are added successively. 1-6 parts of copolyester, 2-10 parts of leveling agent, 3-10 parts of defoamer; stirring and mixing for 10-60 minutes;
[0036] Step 2): PET film casting treatment: After the PET film casting sheet is longitudinally stretched, in order to improve the uniformity of layer distribution, it is necessary to carry out corona treatment on the PET film casting sheet, and then carry out on-line precision coating on the corona surface , namely the following step 3);
[0037] Step 3): coating: the coating solution obtained in step 1) is uniformly coated on the PET base film (the PET film cast after the aforementioned PET film casting treatment is the PET base film) on the corona layer (ie the corona surface);
[0038] Step 4): drying and curing: after the coated PET base film is dehydrated in the transverse stretching preheating section, the coating liquid is dried and cured to form a chemically treated layer; that is, after the PET film cast sheet covered with the coating liquid is coated Carry out transverse stretching, in the preheating section of transverse stretching, the coating solution evaporates the water during the drying process, and finally forms a uniform chemical treatment layer on the surface of the PET film cast;
[0039] Step 5): (PET film casting) non-coated surface corona treatment: the non-coated surface of the transversely stretched and shaped product (PET film) is subjected to corona treatment, and then pulled and rolled.
[0040] Further, the water-soluble copolyester is a copolyester formed by the copolymerization of isophthalic acid, terephthalic acid, ethylene glycol and diethylene glycol.
[0041] Further, the defoamer is 90-99% ethanol by volume or 90-99% n-butanol by volume.
[0042] Further, the leveling agent is one or a mixture of acrylate homopolymer, silicone modified acrylate polymer, polysiloxane, hydrogenated castor oil and polyvinyl butyral.
[0043] Still further, between steps 3) and 4), after the coating is completed, the PET film cast sheet is directly stretched laterally without drying. That is, after the PET film cast sheet is extruded, it is longitudinally stretched and then corona treated before coating. After coating, it directly enters the transverse stretching step, and drying is achieved by the high temperature in the transverse stretching area.
[0044] The product of the present invention obtained by the above method is colorless and transparent, has the characteristics of high gloss, low haze and good smoothness, is easy to be processed and used later, is mainly used to enhance the composite fastness of ink printing, and can play a role in most inks. Significant enhancement.

Example Embodiment

[0046] Embodiment 1: The preparation method of this embodiment comprises the following steps:
[0047] Step 1): Configure the coating liquid:
[0048] Prepare the raw materials according to the following mass parts:
[0049] 85 parts of deionized water, 18 parts of polymethyl methacrylate (PMMA) slurry, 6 parts of water-soluble copolyester, 8 parts of leveling agent, and 8 parts of defoamer;
[0050] Mix deionized water, polymethyl methacrylate (PMMA) slurry, water-soluble copolyester, leveling agent and defoamer in turn, and stir for 10-60 min to form a uniformly dispersed coating solution;
[0051] Step 2): PET film casting process
[0052] The PET film cast sheet is longitudinally stretched, and the longitudinally stretched PET film cast sheet is subjected to corona treatment.
[0053] Step 3): coating: the coating solution obtained in step 1) is applied on-line on the corona surface of the PET cast sheet;
[0054] Further, the online coating method is gravure coating, and the coating thickness (wet coating thickness) measured online is calculated to ensure that the dry coating amount is 0.5-2g/m2. 2. (Here, refer to the online coating and its process control in "Online Coating Technology of Polyester Film" in "China Packaging Industry").
[0055] Step 4): drying and curing: the PET cast sheet covered with the coating liquid then enters the transverse stretching equipment, and in the preheating section of transverse stretching, the coating liquid volatilizes the water during the drying process, and finally forms a uniform film on the surface of the film. Chemical treatment layer.
[0056] Step 5): (PET film casting) non-coated surface corona treatment: after transverse stretching, corona treatment is performed on the non-coated surface of the PET film product, and then pulled and rolled.
[0057] The defoamer is 90-99% n-butanol.
[0058] The leveling agent is polyvinyl butyral.
[0059] The water-soluble copolyester is composed of the following parts by mass: 60 parts of isophthalic acid, 40 parts of terephthalic acid, 30 parts of ethylene glycol, and 70 parts of diethylene glycol through copolymerization.

Example Embodiment

[0060] Embodiment 2: The preparation method of this embodiment is basically the same as that of Embodiment 1, and the difference lies in that the composition of the coating liquid is:
[0061] 80 parts of deionized water, 20 parts of polymethyl methacrylate (PMMA) slurry, 5 parts of water-soluble copolyester, 10 parts of leveling agent, and 10 parts of defoamer. The defoaming agent is 90-99% ethanol by volume. The leveling agent is an acrylate homopolymer.

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Description & Claims & Application Information

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