CN112341659A - Primer, preparation method, raw material formula, coating process and BOPET film - Google Patents
Primer, preparation method, raw material formula, coating process and BOPET film Download PDFInfo
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- CN112341659A CN112341659A CN202011260350.3A CN202011260350A CN112341659A CN 112341659 A CN112341659 A CN 112341659A CN 202011260350 A CN202011260350 A CN 202011260350A CN 112341659 A CN112341659 A CN 112341659A
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- 239000002994 raw material Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 72
- 239000011550 stock solution Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000080 wetting agent Substances 0.000 claims abstract description 16
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- 239000000839 emulsion Substances 0.000 claims description 71
- 239000007787 solid Substances 0.000 claims description 53
- 229920000728 polyester Polymers 0.000 claims description 29
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 28
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- 239000000203 mixture Substances 0.000 claims description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 229920002799 BoPET Polymers 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- -1 sulfonated dioctyl sodium succinate Chemical compound 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- CDOUZKKFHVEKRI-UHFFFAOYSA-N 3-bromo-n-[(prop-2-enoylamino)methyl]propanamide Chemical compound BrCCC(=O)NCNC(=O)C=C CDOUZKKFHVEKRI-UHFFFAOYSA-N 0.000 claims description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 claims description 2
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 claims description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-N hydrogen thiocyanate Natural products SC#N ZMZDMBWJUHKJPS-UHFFFAOYSA-N 0.000 claims description 2
- 229940074404 sodium succinate Drugs 0.000 claims description 2
- 239000002987 primer (paints) Substances 0.000 abstract description 83
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- 238000007639 printing Methods 0.000 abstract description 8
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- 235000017166 Bambusa arundinacea Nutrition 0.000 description 6
- 235000017491 Bambusa tulda Nutrition 0.000 description 6
- 241001330002 Bambuseae Species 0.000 description 6
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- 239000004837 Ultraviolet (UV) light curing adhesive Substances 0.000 description 1
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-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2425/02—Homopolymers or copolymers of hydrocarbons
- C08J2425/04—Homopolymers or copolymers of styrene
- C08J2425/14—Homopolymers or copolymers of styrene with unsaturated esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
Abstract
The invention belongs to the technical field of coating agents, and particularly relates to a primer, a preparation method, a raw material formula, a coating process and a BOPET film. The raw material formula of the background coating agent comprises the following raw materials: deionized water, wetting agent and stock solution. The water-based primer is formed by compounding a plurality of substances, and is suitable for on-line primer coating and off-line primer coating, and the BOPET film after primer coating is simultaneously suitable for thermosetting and photocuring ink printing or functional coating.
Description
Technical Field
The invention belongs to the technical field of coating agents, and particularly relates to a primer, a preparation method, a raw material formula, a coating process and a BOPET film.
Background
It is known that the adhesion of coatings is improved by means of corona in a manner which is not permanent, the adhesion decaying gradually, in particular more rapidly at high temperatures. BOPET (biaxially oriented polyester) films on the market at present generally adopt a primer as a primer layer on the film to play a role in bridging, so that a surface functional coating and the functional film are tightly adhered, namely, the adhesive force of an apparent coating is improved, such as the printing effect is improved, the characteristics of surface hardness, scratch resistance, oil stain resistance and the like are improved, and the adhesive force of the surface coating is kept for a long time. However, primers are generally targeted, and mainly solve the problem of poor adhesion in ink printing and functional coating, so that the universality is poor. In addition, the BOPET film may be subjected to thermal curing or photo-curing (UV curing) by ink printing and functional coating, and the requirements of the two curing modes on the primer are completely different. Therefore, the conventional primer has poor versatility and is difficult to satisfy the above requirements.
Disclosure of Invention
The invention provides a primer, a preparation method, a raw material formula, a coating process and a BOPET film.
In order to solve the technical problems, the invention provides a raw material formula of a primer, which comprises the following raw materials: deionized water, wetting agent and stock solution.
In a second aspect, the present invention also provides a method for preparing a primer, comprising: mixing deionized water, wetting agent and stock solution.
In a third aspect, the invention also provides a primer prepared by the preparation method.
In a fourth aspect, the present invention also provides a BOPET film, comprising: a base film, a primer layer on the surface of the base film; wherein the primer layer is suitable for formation by primer coating as previously described.
In a fifth aspect, the present invention also provides an on-line coating process of a primer, comprising: stretching the PET film longitudinally on line; coating the primer on line by using a coating head according to a certain coating weight; preheating at 110-120 ℃; transversely stretching at 120-135 deg.C; shaping at 210-230 deg.C; cooling and rolling at 100-30 ℃; wherein the coating amount is suitable to be determined according to the solid content of the stock solution and the size of the notch of the coating head.
In a sixth aspect, the present invention also provides an off-line coating process of a primer, comprising: off-line coating of the primer as described previously; drying at 80-120 deg.C; and (6) cooling and rolling.
The invention has the beneficial effects that the primer, the preparation method, the raw material formula, the coating process and the BOPET film are compounded by various substances to form the water-based primer, so that the primer is suitable for on-line primer coating and off-line primer coating, and the BOPET film after primer coating is simultaneously suitable for thermosetting and photocuring ink printing or functional coating.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of an in-line coating process for a primer of the present invention;
FIG. 2 is a flow chart of an off-line coating process of the primer of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the defect of poor universality of the existing primer, the invention provides a raw material formula of the primer, which comprises the following raw materials: deionized water, wetting agent and stock solution.
Optionally, the mass ratio of the deionized water to the stock solution to the wetting agent is (59-90): (5-40): (1-5); preferably, the mass ratio of the deionized water to the stock solution to the wetting agent is (68-86): (10-30): (2-4).
Optionally, the wetting agent comprises one or more of isopropanol, thiocyanate, sulfonated dioctyl sodium succinate and dioctyl sodium sulfosuccinate.
As an alternative embodiment of the stock solution.
The stock solution comprises: at least two of acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, acrylic polyurethane, polyester emulsion and modified polyester emulsion.
Specifically, the acrylic emulsion (type No. but not limited to, disemann a1127) has a solids content of 44%; the styrene-acrylic emulsion (type is but not limited to Tesmann XK102) has a solid content of 40%; the polyurethane emulsion (type No. but not limited to jeans 408A with a solids content of 20 or chang 89216 with a solids content of 35%) has a solids content of 20-35%; the acrylic polyurethane (model number is but not limited to Wanhua 509) has a solid content of 40%; the polyester emulsion (model number is but not limited to Toyobo 1245 or Toyobo 35336) has a solids content of 30%; the solid content of the modified polyester emulsion (the type is but not limited to bamboo grease YE309) is 30%.
The primer is generally divided into water-based primer and oil-based primer, the primer is better from the viewpoint of environmental protection and safety, and the water-based primer is mostly used for online coating of the biaxially oriented polyester film, so that the aim of pre-coating is to enhance the adhesive force or antistatic property of printing or functional coating. The off-line coating can be carried out by using a water-based primer or an oil-based primer, which is generally selected according to different purposes and environmental protection equipment configurations, but the water-based primer is the key development direction.
The primer can be formed by selecting at least two combinations of acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, acrylic polyurethane, polyester emulsion and modified polyester emulsion as stock solution and mixing the stock solution with deionized water, a wetting agent and the like, wherein the stock solution can contain various components such as acrylic substances (carboxyl, hydroxyl and epoxy), polyurethane substances (polyester, polyether and polycarbonate), acrylic polyurethane copolymerization substances, styrene acrylic copolymerization substances, polyester substances (sulfonic group and carboxyl), modified polyolefin substances and the like, so that the applicability can be improved, and the adhesive force can be enhanced. The primer is mainly the synergistic matching and proper proportioning of a plurality of different resins to improve the universality, is mainly reflected in better compatibility and flexibility, improves the compatibility to other different materials, and improves the adhesive force strength of an upper layer and a lower layer through partial cross-linking and curing.
Further, the invention also provides a preparation method of the primer, which comprises the following steps: mixing deionized water, wetting agent and stock solution.
In the preparation method of the primer in this example, a stirring tank equipped with an automatic metering deionized water, an electronic scale, etc. were used. According to the formula of the primer, the components are respectively added into a stirring tank according to the proportion and the sequence, deionized water → wetting agent → stock solution, the temperature of the stirring tank is 20-25 ℃, the stirring speed is 150-200 r/min, and the stirring time is 15-20 min.
Further, the invention also provides the primer prepared by the preparation method.
Further, the present invention also provides a BOPET film comprising: a base film, a primer layer on the surface of the base film; wherein the primer layer is suitable for formation by primer coating as previously described.
Further, referring to fig. 1, the present invention also provides an on-line coating process of a primer, comprising: stretching the PET film longitudinally on line; coating a primer on line by using a coating head according to a certain coating amount; preheating at 110-120 deg.C, which can be 112 deg.C, 115 deg.C, 118 deg.C; transversely stretching at 120-135 deg.C, or at 122 deg.C, 120 deg.C, 128 deg.C, 134 deg.C; 210-230 deg.C, or 213 deg.C, 216 deg.C, 218 deg.C, 225 deg.C, 228 deg.C, 229 deg.C; cooling at 100-30 deg.C and rolling to obtain on-line coatingThe BOPET film of (1); wherein the coating amount is suitable to be determined according to the solid content of the stock solution and the size of the notch of the coating head. The coating weight is divided into wet glue amount and dry glue amount, the wet glue amount is related to the size of a wire slot of a coating head (a wire bar is generally used for online coating), the gram weight of each square meter of the prepared primer coated on the BOPET film is the wet glue amount, and the wet glue amount is generally 8-10g/m2(ii) a The amount of dry glue is the amount of wet glue multiplied by the solids content of the primer formulation. This is an in-line application with the application equipment placed between the longitudinal and transverse stretching equipment.
Further, referring to fig. 2, the present invention also provides an off-line coating process of a primer, comprising: coating a primer off line; drying at 80-120 deg.C; and cooling and rolling to obtain the off-line coated BOPET film.
The coating head of the coating equipment can be a slightly concave type, and also can be a spraying line rod type, and off-line coating can be carried out, and the spraying line rod type is generally adopted for on-line coating. Off-line coating weights also split wet and dry gums.
A second part: some examples are given below
Example 1
The off-line coating BOPET film is prepared by an off-line coating process, and the main equipment tools and materials are as follows: the production line of the coating machine (comprising a coating machine head, a drying oven and a cooling winder), the bottomless coating BOPET film roll (with the thickness of 0.125mm), the wire rod (10u), the electronic scale and the like. The off-line coating process is as follows: off-line coating of the primer as described previously; drying at 80-120 deg.C; and cooling and rolling to obtain the off-line coated BOPET film. The primer comprises the following raw materials in percentage by weight: the mass ratio of deionized water, acrylic emulsion (type is but not limited to Tesmann A1127, solid content is 44%), polyurethane emulsion (type is but not limited to Jiepai 408A, solid content is 20%, in the present case defined as polyurethane emulsion I), wetting agent (mixed solution of isopropanol and the like) is 75: 10: 10: 5.
example 2
An off-line coating process was used to prepare an off-line coated BOPET film, and example 2 differs from example 1 in that polyurethane emulsion i (model No. but not limited to jeidan 408A, 20% solids) was replaced with an equivalent amount of polyurethane emulsion ii (model No. but not limited to chang 89216, 35% solids, defined in this case as polyurethane emulsion ii).
Example 3
Example 3 differs from example 2 in that polyurethane emulsion i (type No. but not limited to jerry 408A, with a solids content of 20%) was replaced with an equivalent amount of polyester emulsion ii (type No. but not limited to jerry 35336, with a solids content of 30%, defined in this case as polyester emulsion ii).
Example 4
An off-line coated BOPET film was prepared using an off-line coating process, example 4 differing from example 3 in that the acrylic emulsion (type No. but not limited to tesmann a1127, 44% solids) was replaced with an equivalent amount of styrene acrylic emulsion (type No. but not limited to tesmann XK102, 40% solids).
Example 5
An off-line coating process was used to prepare an off-line coated BOPET film, example 5 differs from example 4 in that polyester emulsion ii (type No. but not limited to, alvarez 35336, 30% solids) was replaced with an equivalent amount of modified polyester emulsion (type No. but not limited to, bamboo grease YE309, 30% solids).
Example 6
Example 6 differs from example 3 in that polyurethane emulsion i (type No. but not limited to jeans 408A, with a solid content of 20%) was replaced with an equivalent amount of polyester emulsion i (type No. but not limited to toyobo 1245, with a solid content of 30%, in this case defined as polyester emulsion i).
Example 7
An off-line coated BOPET film was prepared using an off-line coating process, example 7 differing from example 6 in that the acrylic emulsion (type but not limited to tesmann a1127, 44% solids) was replaced by an equivalent amount of modified polyester emulsion (type but not limited to bamboo grease YE309, 30% solids).
Example 8
An off-line coated BOPET film was prepared using an off-line coating process, and example 8 differs from example 7 in that the modified polyester emulsion (type No. but not limited to bamboo grease YE309, 30% solids) was replaced with an equivalent amount of styrene-acrylic emulsion (type No. but not limited to tesmann XK102, 40% solids).
Example 9
Example 9 differs from example 8 in that the styrene-acrylic emulsion (type No. but not limited to Dismann XK102, 40% solids) was replaced with an equivalent amount of acrylic polyurethane (type No. but not limited to Wanhua 509, 40% solids).
Example 10
An offline coating process is adopted to prepare an offline coated BOPET film, and the difference between the example 10 and the example 9 is that the stock solution is prepared by mixing three components, namely styrene-acrylic emulsion (the type is but not limited to Tesman XK102, the solid content is 40%), polyester emulsion I (the type is but not limited to Toyo textile 1245, the solid content is 30%), modified polyester emulsion (the type is but not limited to bamboo grease YE309, the solid content is 30%) in a mass ratio of 10: 5: 5.
comparative example 1
The off-line coating BOPET film is prepared by an off-line coating process, and the main equipment tools and materials are as follows: the production line of the coating machine (comprising a coating machine head, a drying oven and a cooling winder), the bottomless coating BOPET film roll (with the thickness of 0.125mm), the wire rod (10u), the electronic scale and the like. The off-line coating process is as follows: off-line coating of the primer as described previously; drying at 80-120 deg.C; and cooling and rolling to obtain the off-line coated BOPET film. The primer comprises the following raw materials in percentage by weight: the mass ratio of the deionized water to the acrylic emulsion (type is but not limited to Disemann A1127, the solid content is 44%) to the wetting agent (mixed liquid of isopropanol and the like) is 78: 20: 2.
comparative example 2
Comparative example 2 differs from comparative example 1 in that the acrylic emulsion (type No. but not limited to imperial a1127, 44% solids) was replaced with an equivalent amount of styrene-acrylic emulsion (type No. but not limited to imperial XK102, 40% solids).
Comparative example 3
Comparative example 3 differs from comparative example 1 in that the acrylic emulsion was replaced (type No. but not limited to Dismann A1127, 44% solids) to an equivalent amount of polyurethane emulsion (type No. but not limited to Jetta 408A, 20% solids).
Comparative example 4
Comparative example 4 differs from comparative example 1 in that the acrylic emulsion (type No. but not limited to imperial a1127, 44% solids) was replaced with an equal amount of acrylic polyurethane (type No. but not limited to wanwa 509, 40% solids).
Comparative example 5
Comparative example 5 differs from comparative example 1 in that the primer raw material formulation is the same, but an in-line coating process was used to prepare an in-line coated BOPET film as follows: coating the Pet film after the online longitudinal stretching with the primer on line according to a certain coating weight by using a coating head; preheating at 110-120 ℃; transversely stretching at 120-135 deg.C; shaping at 210-230 deg.C; cooling and rolling at 100-30 ℃ to obtain the BOPET film coated on line.
Comparative example 6
Comparative example 6 differs from comparative example 1 in that the acrylic emulsion (type No. but not limited to Dismann A1127, 44% solids) was replaced by an equivalent amount of polyester emulsion II (type No. but not limited to Lithan 35336, 30% solids).
Comparative example 7
An off-line coated BOPET film was prepared using an off-line coating process, and comparative example 7 differs from comparative example 1 in that the acrylic emulsion (type but not limited to tesmann a1127, 44% solids) was replaced with an equivalent amount of modified polyester emulsion (type but not limited to bamboo grease YE309, 30% solids).
Comparative example 8
While an off-line coating process was used to prepare an off-line coated BOPET film, comparative example 8 differs from comparative example 1 in that the acrylic emulsion (type but not limited to imperial a1127, 44% solids) was replaced with an equivalent amount of polyester emulsion i (type but not limited to dongyang 1245, 30% solids).
And a third part: comparative analysis of performance parameters
In this section, adhesion tests were performed on various BOPET films prepared in examples 1 to 10 and comparative examples 1 to 8, and on existing BOPET films with a base coat, such as Dongli film (comparative example 9), Lekea film (comparative example 10), and Skc film (comparative example 11), wherein the raw material formula of the base coat agent in each example is shown in Table 1, and the corresponding test results are shown in Table 2.
(1) Main equipment tool material
Microwave electrodeless Uv curing machine (changzhou purple wave electronics technology ltd), line bar (10u), electronic scale, oven (120 ℃), thermosetting PVC ink (purida, xinxin), korea perpetual motion matte (Uv-perpetual motion), korea kanis Uv varnish (matte Uv-G-10, highlight Uv-8300, antifogging Uv-80), bagger test knife, 3M adhesive tape. The adhesive force is represented by a Baige test standard GB/T9286-98, 0B-5B (the actual application is more than or equal to 4B and the adhesive force is qualified).
(2) Analysis of test results
As can be seen by combining Table 1 and Table 2, the primer formulation in the comparative example is prone to either thermosetting PVC ink adhesion or photocurable coating adhesion, resulting in 6 adhesion test results of no primer coating being greater than or equal to 4B, and therefore, the primer coating in the comparative example is difficult to be thermosetting and photocurable. The primer adopts at least two combinations of acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, acrylic polyurethane, polyester emulsion and modified polyester emulsion as stock solutions, is compatible with the application of thermosetting ink and UV (ultraviolet) photocuring functional coating, has strong compatibility and adhesive force, improves the curing reaction speed, can achieve the using effect after curing by using less energy and shorter time, saves energy and improves the working efficiency.
TABLE 1 primer formulation for each example
In table 1: the contents of all the components are in parts by mass.
TABLE 2 adhesion test results for various base-coated BOPET films
| Detailed Description | Pridada | Xingxin | UV-permanent feeding | UV-G-10 | UV-8300 | UV-80 |
| Example 1 | 3B | 1B | 0B | 0B | 0B | 0B |
| Example 2 | 4B | 3B | 0B | 0B | 0B | 3B |
| Examples3 | 4B | 1B | 5B | 5B | 0B | 0B |
| Example 4 | 4B | 0B | 0B | 5B | 5B | 5B |
| Example 5 | 5B | 4B | 5B | 5B | 4B | 5B |
| Example 6 | 5B | 4B | 0B | 5B | 0B | 0B |
| Example 7 | 5B | 4B | 0B | 0B | 0B | 0B |
| Example 8 | 0B | 0B | 4B | 4B | 3B | 3B |
| Example 9 | 5B | 4B | 4B | 4B | 0B | 5B |
| Example 10 | 5B | 5B | 5B | 5B | 5B | 5B |
| Comparative example 1 | 4B | 3B | 0B | 0B | 0B | 0B |
| Comparative example 2 | 0B | 0B | 5B | 5B | 4B | 0B |
| Comparative example 3 | 5B | 4B | 0B | 0B | 0B | 0B |
| Comparative example 4 | 5B | 3B | 0B | 0B | 0B | 0B |
| Comparative example 5 | 5B | 4B | 5B | 5B | 2B | 0B |
| Comparative example 6 | 0B | 0B | 5B | 5B | 0B | 1B |
| Comparative example 7 | 5B | 4B | 0B | 0B | 0B | 0B |
| Comparative example 8 | 0B | 0B | 5B | 5B | 4B | 5B |
| Comparative example 9 | 0B | 0B | 5B | 5B | 5B | 5B |
| Comparative example 10 | 1B | 0B | 5B | 4B | 4B | 5B |
| Comparative example 11 | 0B | 0B | 5B | 5B | 5B | 5B |
In the actual priming process, if the priming formula influencing the appearance such as uneven coating stripes, rainbow stripes and the like is found, the priming formula can be directly abandoned without secondary ink or coating and adhesion test. Some basecoated BOPET films, after secondary functional coating, can suffer orange peel, stickiness, increased haze, decreased clarity, etc., and such basecoating formulations are abandoned.
(3) Simulation on-line stretching base coating film
According to the test results in the table 2, the primer corresponding to the example 5 and the example 10 with better test results is selected, firstly, the Pet sheet with 0.5mm is subjected to primer coating according to an off-line coating mode, then the stretching is carried out by 4 times on an experimental stretcher, and the on-line stretching (3-4 times in the transverse direction) is carried out after the simulation of production line primer coating. Materials and equipment: cast PET sheet (0.5mm), primer for example 5 and example 10, 10u bar, oven (70 ℃), Experimental biaxial stretcher (POTOP, national). In operation, the coated PET sheet is cut by 10 x 10cm, placed in a stretching machine groove, clamped by clips at four sides, pre-heated at 130-160 ℃, stretched by 2 x 2 times when the film temperature reaches about 90 ℃, the clip part of the stretched PET film (0.125mm) is cut off, and the adhesion test of the thermosetting PVC ink and the UV light curing varnish on the 4-time stretched Pet base coating film is repeated, so that the adhesion effect of the embodiment 5 and the embodiment 10 in the table 2 can be achieved.
(4) On-line transverse stretching bottom-coating BOPET film
Through (3) a simulation online tensile test, the primer of the embodiment 5 and the primer of the embodiment 10 achieve the expected effect, namely, the thermosetting and UV light curing materials are compatible, and the adhesion force of the 6-item Baige test is more than or equal to 4B, on the basis, the primer of the embodiment 5 and the primer of the embodiment 10 are arranged on a BOPET production line, and because the transverse stretching is about 3.5 times, the elongation at break of the primer resin in a hot state is required to be more than 4 times. The on-line stretching priming coating process comprises the following steps: coating the Pet film after the online longitudinal stretching with the primer on line according to a certain coating weight by using a coating head; preheating at 110-120 ℃; transversely stretching at 120-135 deg.C; shaping at 210-230 deg.C; cooling and rolling at 100-30 ℃; wherein the coating amount is suitable to be determined according to the solid content of the stock solution and the size of the notch of the coating head. The results of example 5 and example 10 in Table 2 were obtained by performing 6 adhesion tests on 2 kinds of on-line primed BOPET films.
(5) Application field of primer
The primer is water-based, is suitable for off-line and on-line coating types, has small Voc (volatile organic compound) emission, and has much less investment on environment-friendly treatment devices compared with solvent type Rto high-temperature incineration equipment. The BOPET film after the primary coating is widely applied, and is suitable for both thermal curing and UV light curing, so that the BOPET film can be widely applied to industries such as electronic packaging, household appliances, building materials, communication, medicines and the like, for example, various packaging films are used for printing ink; the hardening treatment of the surface of the decorative film of household appliances and furniture embodies the functions of scratch resistance, stain resistance and the like; the high-end antifogging mask base material is also used, and the characteristics of high transmittance, low fog and alcohol wiping resistance are embodied through the UV antifogging coating; the mobile phone screen film protective film has the functions of hardening, resisting pollution, resisting fingerprints and the like.
In conclusion, the primer, the preparation method, the raw material formula and the coating process of the primer, disclosed by the invention, have the advantages that the BOPET film adopts at least two combinations of acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, acrylic polyurethane, polyester emulsion and modified polyester emulsion as stock solutions, can be compatible with the application of thermosetting ink and UV photocuring functional coatings, has stronger applicability, can meet different curing modes by adopting one primer BOPET film, improves the utilization rate of materials, and is particularly suitable for thermosetting or photocuring UV printing/coating materials after the primer is coated on the BOPET film.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The raw material formula of the primer is characterized by comprising the following raw materials:
deionized water, wetting agent and stock solution.
2. The stock formulation of claim 1,
the mass ratio of the deionized water to the stock solution to the wetting agent is (59-90): (5-40): (1-5).
3. The stock formulation of claim 1,
the stock solution comprises: at least two of acrylic emulsion, styrene-acrylic emulsion, polyurethane emulsion, acrylic polyurethane, polyester emulsion and modified polyester emulsion.
4. A feedstock formulation according to claim 3,
the solid content of the acrylic emulsion is 44%;
the solid content of the styrene-acrylic emulsion is 40%;
the solid content of the polyurethane emulsion is 20-35%;
the solid content of the acrylic polyurethane is 40%;
the solid content of the polyester emulsion is 30 percent;
the solid content of the modified polyester emulsion was 30%.
5. The stock formulation of claim 1,
the wetting agent comprises one or a combination of more of isopropanol, thiocyanate, sulfonated dioctyl sodium succinate and dioctyl sodium sulfosuccinate.
6. A method for preparing a primer, which is characterized by comprising the following steps:
mixing deionized water, wetting agent and stock solution.
7. A primer prepared by the preparation method according to claim 6.
8. A BOPET film, comprising:
a base film, a primer layer on the surface of the base film; wherein
The primer layer is suitably formed by coating the primer according to claim 7.
9. An in-line coating process for a primer, comprising:
stretching the PET film longitudinally on line;
coating the primer according to claim 7 on line by using a coating head according to a certain coating amount;
preheating at 110-120 ℃;
transversely stretching at 120-135 deg.C;
shaping at 210-230 deg.C;
cooling and rolling at 30 ℃; wherein
The coating amount is suitable to be determined according to the solid content of the stock solution and the size of the notch of the coating head.
10. An off-line coating process for a primer, comprising:
off-line coating the primer of claim 7;
drying at 80-120 deg.C;
and (6) cooling and rolling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113004756A (en) * | 2021-03-24 | 2021-06-22 | 安徽国风塑业股份有限公司 | PET (polyethylene terephthalate) primer for water-based UV (ultraviolet) coating as well as preparation method and application of PET primer |
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| JPH09263710A (en) * | 1996-03-28 | 1997-10-07 | Sk Kaken Co Ltd | Water-base resin composition for undercoating material |
| CN103409046A (en) * | 2013-08-20 | 2013-11-27 | 广东新供销天保再生资源发展有限公司 | Water-based PET (polyethylene terephthalate) undercoat paint, and preparation method and application thereof |
| CN105949984A (en) * | 2016-05-24 | 2016-09-21 | 江苏裕兴薄膜科技股份有限公司 | Universal online coating liquid for polyester films and method for manufacturing universal online coating liquid |
| CN110804351A (en) * | 2018-08-02 | 2020-02-18 | 重庆韩拓科技有限公司 | Environment-friendly water-based PVC film primer and preparation method and application thereof |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09263710A (en) * | 1996-03-28 | 1997-10-07 | Sk Kaken Co Ltd | Water-base resin composition for undercoating material |
| CN103409046A (en) * | 2013-08-20 | 2013-11-27 | 广东新供销天保再生资源发展有限公司 | Water-based PET (polyethylene terephthalate) undercoat paint, and preparation method and application thereof |
| CN105949984A (en) * | 2016-05-24 | 2016-09-21 | 江苏裕兴薄膜科技股份有限公司 | Universal online coating liquid for polyester films and method for manufacturing universal online coating liquid |
| CN110804351A (en) * | 2018-08-02 | 2020-02-18 | 重庆韩拓科技有限公司 | Environment-friendly water-based PVC film primer and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113004756A (en) * | 2021-03-24 | 2021-06-22 | 安徽国风塑业股份有限公司 | PET (polyethylene terephthalate) primer for water-based UV (ultraviolet) coating as well as preparation method and application of PET primer |
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