阅读说明：本技术 一种高密着性mlcc制程用离型膜基膜及其制备方法 (Release film base film for high-adhesion MLCC (multilayer ceramic capacitor) manufacturing process and preparation method thereof ) 是由 李明勇 王强 刘小东 辛嘉庆 孙艳斌 梁雪芬 程凡宝 李宇航 石少进 于 2019-12-23 设计创作，主要内容包括：本发明公开一种高密着性MLCC制程用离型膜基膜及其制备方法,该发明产品包括第一层、第二层和第三层,所述第三层的表面涂布有第三层涂布液,所述第三层涂布液的成分及重量份如下：1.5重量份～12重量份的树脂,0.01重量份～0.1重量份的N,N-二甲基乙醇胺,0.1重量份～1重量份的表面活性剂,0.01重量份～0.5重量份的消泡剂,0.05重量份～1重量份的固化剂,本发明产品在第三层涂布所使用的树脂经果交联后形成致密的树脂层,可有效阻隔低聚物,防止进入到离型层,降低残余黏着力。(The invention discloses a release film base film for a high-adhesion MLCC (multilayer ceramic capacitor) manufacturing process and a preparation method thereof, wherein the release film base film comprises a first layer, a second layer and a third layer, wherein the surface of the third layer is coated with a third layer coating liquid, and the third layer coating liquid comprises the following components in parts by weight: 1.5-12 parts by weight of resin, 0.01-0.1 part by weight of N, N-dimethylethanolamine, 0.1-1 part by weight of surfactant, 0.01-0.5 part by weight of defoaming agent and 0.05-1 part by weight of curing agent.)

1. A release film base film for a high-adhesion MLCC (multilayer ceramic capacitor) process comprises a first layer, a second layer and a third layer, and is characterized in that the surface of the third layer is coated with a third layer coating liquid, and the third layer coating liquid comprises the following components in parts by weight:

the resin comprises acrylic acid, polyester and polyurethane, wherein the weight ratio of the acrylic acid to the polyester to the polyurethane is (10-50): (10-50): (10-100), the second layer comprises a rapid crystallization material, and the rapid crystallization material comprises the following components in parts by weight:

0.05 to 0.5 weight portion of inorganic nano particles

20 to 80 parts by weight of polyester

The inorganic nano particles comprise nano silicon dioxide, nano barium sulfate and nano calcium carbonate; the polyester comprises one of PET, APET and CPET.

2. The release film base film for the process of manufacturing the MLCC with high adhesion as claimed in claim 1, wherein the pH of the third layer coating liquid is 7.5-10, the particle size of the third layer coating liquid is 10 nm-200 nm, the glass transition temperature of the third layer coating liquid is 30-85 ℃, and the elongation at break of the third layer coating liquid is 300-800%.

3. The release film base film for the process of manufacturing the MLCC with high adhesion as claimed in claim 1, wherein the surfactant is a modified organosiloxane.

4. The release film-based film for the manufacture of the MLCC with high adhesion as claimed in claim 1, wherein the leveling agent is isopropyl alcohol.

5. The release film-based film for the manufacturing process of MLCC with high adhesion as claimed in claim 1, wherein the defoaming agent is silicone polyether copolymer.

6. The release film-based film for the manufacture of high-adhesion MLCC according to claim 1, wherein the curing agent is water-dispersible isocyanate and isocyanate.

7. A method for preparing the release film base film for the process of manufacturing the high-adhesion MLCC as described in any one of claims 1 to 6, comprising the steps of:

step S1: conveying raw materials of a first layer to a first extruder, wherein the components and parts by weight of the first layer are as follows:

50-90 parts by weight of first layer polyester base material

10-50 parts of first layer polyester master batch

The particle size of the first layer of polyester master batch is less than 2 um; conveying a second layer of polyester base stock to a second extruder; conveying the raw materials of a third layer to a third extruder, wherein the components and parts by weight of the third layer are as follows:

50-100 parts of third-layer polyester base material

0-50 parts of the third layer of polyester master batch;

step S2: the first extruder, the second extruder and the third extruder are melted at the temperature of 265-300 ℃, and the extrusion thickness of the first extruder is set to be 0.5-5 mu m; the extrusion thickness of the second extruder is set to be 8-40 mu m; the extrusion thickness of the third extruder is set to be 0.5-5 μm, and the first, second and third layers are co-extruded by the first, second and third extruders;

step S3: casting the first layer, the second layer and the third layer on a cold drum at 15-40 ℃, longitudinally stretching to 3.0-3.8 times, and cooling to 20-45 ℃;

step S4: coating a third layer coating liquid on the third layer, wherein the third layer coating liquid comprises the following components in parts by weight:

the resin comprises acrylic acid, polyester and polyurethane, wherein the weight ratio of the acrylic acid to the polyester to the polyurethane is (10-50): (10-50): (10-100), the second layer comprises a rapid crystallization material, and the rapid crystallization material comprises the following components in parts by weight:

0.05 to 0.5 weight portion of inorganic nano particles

20 to 80 parts by weight of polyester

The inorganic nano particles comprise nano silicon dioxide, nano barium sulfate and nano calcium carbonate; the polyester comprises one of PET, APET and CPET;

step S5: preheating the first layer, the second layer and the third layer at 80-145 ℃, transversely stretching to 3.0-4.5 times, and then performing heat setting at 200-250 ℃;

step S6: and cooling the first layer, the second layer and the third layer at 30-35 ℃ and room temperature, and then rolling.

8. The method according to claim 7, wherein the longitudinal stretching is performed in a longitudinal stretching section having a length of 3m to 5m and a temperature of 65 ℃ to 90 ℃.

9. The method according to claim 7, characterized in that the transverse stretching is carried out in a transverse stretching section having a length comprised between 10m and 16m and a temperature comprised between 100 ℃ and 160 ℃.

10. The method of claim 7, wherein the heat setting is performed on a heat setting section having a length of 10m to 20 m.

Technical Field

The invention belongs to the field of polyethylene terephthalate films and preparation thereof, and particularly relates to a release film base film for a high-adhesion MLCC (multilayer ceramic capacitor) manufacturing process and a preparation method thereof.

Background

The polyester film material is applied to MLCC manufacturing and is used as a basic material of consumables of an MLCC manufacturing process. Because the polyester film has low roughness and heat resistance, the polyester film plays a supporting role in the MLCC production process. Many researchers in this field have adopted different methods to solve the roughness and processability of the polyester-based film surface.

The polyester film is usually a film material prepared by using polyester as a main raw material, preparing a thick sheet by an extrusion method, and stretching the thick sheet in a longitudinal direction and a transverse direction. At present, the polyester film adopts micron-sized inorganic filler, the surface performance is partially solved, but the surface roughness Ra of the product is still larger than 45nm, the warping is verified, the stiffness is low, and the problem that the product is easy to transfer after being coated with a release agent cannot meet the requirements of a small-size MLCC product of a subsequent user on the surface roughness, the warping degree, the stiffness, the high adhesion and the like of the polyester film.

Chinese patent CN200480023794.8 discloses an easily adhesive polyester film for optical use and an optical laminated polyester film, which can suppress iridescent coloration under fluorescent lamps and have excellent adhesion to a hard coat layer and adhesion under high temperature and high humidity (moisture and heat resistance). A biaxially oriented polyester film, which is obtained by coating at least one side of a biaxially oriented polyester film with an aqueous coating solution containing a resin composition comprising an aqueous polyester resin (A) and at least one member (B) selected from the group consisting of water-soluble titanium chelate compounds, water-soluble titanium acylate compounds, water-soluble zirconium chelate compounds and water-soluble zirconium acylate compounds as main components, and having a (A)/(B) mixing ratio (weight ratio) of 10/90 to 95/5, drying the coating solution, and laminating a coating layer extending at least in one direction, is complicated in process and operation, and is not suitable for mass production.

Chinese patent CN201820049127.6 discloses a high-adherence anti-static release protective film, which comprises a protective film body, wherein the protective film body comprises a nano coating, and the bottom of the nano coating is fixedly connected with toughened glass, a waterproof layer, an optical film layer, a polyester film layer, a substrate, an anti-static coating, a silica gel coating, an acrylic adhesive layer and a release film layer in sequence.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a release film base film for a high-adhesion MLCC (multilayer ceramic chip carrier) manufacturing process and a preparation method thereof, and the specific technical scheme of the invention is as follows:

a release film base film for a high-adhesion MLCC (multilayer ceramic capacitor) process comprises a first layer, a second layer and a third layer, wherein a third layer coating liquid is coated on the surface of the third layer, and the third layer coating liquid comprises the following components in parts by weight:

the resin comprises acrylic acid, polyester and polyurethane, wherein the weight ratio of the acrylic acid to the polyester to the polyurethane is (10-50): (10-50): (10-100), the second layer comprises a rapid crystallization material, and the rapid crystallization material comprises the following components in parts by weight:

0.05 to 0.5 weight portion of inorganic nano particles

10-50 parts by weight of polyester, wherein the inorganic nanoparticles comprise nano silicon dioxide, nano barium sulfate and nano calcium carbonate; the polyester comprises one of PET, APET and CPET.

As an improved technical scheme of the invention, the pH value of the third layer coating liquid is 7.5-10, the particle size of the third layer coating liquid is 10-200 nm, the glass transition temperature of the third layer coating liquid is 30-85 ℃, and the breaking elongation of the third layer coating liquid is 300-800%.

As an improved technical scheme of the invention, the surfactant is modified organic siloxane.

As an improved technical scheme of the invention, the leveling agent is isopropanol.

As an improved technical scheme of the invention, the defoaming agent is a silicone polyether copolymer.

As an improved technical scheme of the invention, the curing agent is water dispersible isocyanate and isocyanate.

A method for preparing the release film base film for the high-adhesion MLCC process comprises the following steps:

step S1: conveying raw materials of a first layer to a first extruder, wherein the components and parts by weight of the first layer are as follows:

50-90 parts by weight of first layer polyester base material

10-50 parts of first layer polyester master batch

The particle size of the first layer of polyester master batch is less than 2 um; conveying a second layer of polyester base stock to a second extruder; conveying the raw materials of a third layer to a third extruder, wherein the components and parts by weight of the third layer are as follows:

50-100 parts of third-layer polyester base material

0-50 parts of the third layer of polyester master batch;

step S2: the first extruder, the second extruder and the third extruder are melted at the temperature of 265-300 ℃, and the extrusion thickness of the first extruder is set to be 0.5-5 mu m; the extrusion thickness of the second extruder is set to be 8-40 mu m; the third extruder is set to have an extrusion thickness of 0.5 to 5 [ mu ] m, and the first, second, and third layers are co-extruded by the first, second, and third extruders;

step S3: casting the first layer, the second layer and the third layer on a cold drum at 15-40 ℃, longitudinally stretching to 3.0-3.8 times, and cooling to 20-45 ℃;

step S4: coating a third layer coating solution on the third layer, wherein the third layer coating solution comprises the following components in parts by weight:

the resin comprises acrylic acid, polyester and polyurethane, wherein the weight ratio of the acrylic acid to the polyester to the polyurethane is (10-50): (10-50): (10-100), the second layer comprises a rapid crystallization material, and the rapid crystallization material comprises the following components in parts by weight:

0.05 to 0.5 weight portion of inorganic nano particles

10 to 50 parts by weight of polyester.

The inorganic nano particles comprise nano silicon dioxide, nano barium sulfate and nano calcium carbonate; the polyester comprises one of PET, APET and CPET;

step S5: preheating the first layer, the second layer and the third layer at 80-145 ℃, transversely stretching to 3.0-4.5 times, and then performing heat setting at 200-250 ℃;

step S6: and cooling the first layer, the second layer and the third layer at 30-35 ℃ and room temperature, and then rolling.

As an improved technical scheme of the invention, the longitudinal stretching is carried out on a longitudinal stretching section, the length of the longitudinal stretching section is between 3 and 5m, and the temperature is between 65 and 90 ℃.

As an improved technical scheme of the invention, the transverse stretching is carried out on a transverse stretching section, the length of the transverse stretching section is 10-16 m, and the temperature is 100-160 ℃.

As an improved technical scheme of the invention, the heat setting is carried out on a heat setting section, and the length of the heat setting section is between 10 and 20 m.

Advantageous effects

Compared with the prior art, the invention has the following characteristics and beneficial effects:

(1) the second layer uses the quick crystallization material, for the film crystallization provides the crystal nucleus, is favorable to the crystalline region to increase to improve the degree of crystallinity of film, prevent that low molecular thing from producing.

(2) According to the invention, the resin used for coating the third layer is crosslinked to form a compact resin layer, so that the oligomer on the surface of the film can be effectively prevented from entering the release layer, and the residual adhesive force of the release agent is reduced.

(3) The invention coats the polyacrylic acid/polyester/polyurethane coating on the surface of the third layer in an online coating mode, the resin can effectively fill the uneven area on the surface of the film, thereby reducing the surface roughness which can reach 5 nm-10 nm,

(4) the polyacrylic acid/polyester/polyurethane coating coated on the third layer can increase the adhesive force between the base film and the release agent, improve the residual adhesive force of the release layer and reduce the transfer of the release agent.

(5) The preparation process of the release film base film for the high-adhesion MLCC is simple and convenient, easy to operate, high in practicability and low in cost.

Detailed Description

In order to make the purpose and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. Based on the described embodiments of the invention, all other embodiments obtained by a person skilled in the art without any inventive step are within the scope of the invention.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.