阅读说明：本技术 一种低粗糙度mlcc制程用离型膜基膜及其制备方法 (Release film base film for low-roughness MLCC (multilayer ceramic chip carrier) 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：本发明涉及一种低粗糙度MLCC制程用离型膜基膜及其制备方法,所述低粗糙度MLCC制程用离型膜基膜包括第一层、第二层和第三层,所述第三层包含50克的第三层改性聚酯基料及50克的第三层表面改性料,所述第三层改性聚酯基料包含1克的第一共聚酯及49克的第三层聚酯基料。本发明第三层包含第三层表面改性料,较好地解决薄膜表面粗糙度高的问题,相对于现有采用微米级无机粒子,本发明产品表面粗糙度降低到10nm～20nm。(The invention relates to a release film base film for a low-roughness MLCC (multilayer ceramic capacitor) process and a preparation method thereof, wherein the release film base film for the low-roughness MLCC process comprises a first layer, a second layer and a third layer, the third layer comprises 50 g of third layer modified polyester base material and 50 g of third layer surface modified material, and the third layer modified polyester base material comprises 1 g of first copolyester and 49 g of third layer polyester base material. The third layer of the invention comprises the third layer of surface modification material, which better solves the problem of high surface roughness of the film, and compared with the prior art which adopts micron-sized inorganic particles, the surface roughness of the product of the invention is reduced to 10 nm-20 nm.)

1. A release film base film for a low-roughness MLCC (multilayer ceramic chip carrier) manufacturing process comprises a first layer, a second layer and a third layer, and is characterized in that the third layer comprises the following components in parts by weight:

50-100 parts of third-layer modified polyester base material

0 to 50 parts by weight of third-layer surface modified material

The third layer of modified polyester base material comprises the following components in parts by weight:

1 to 20 parts by weight of a first copolyester

49-80 parts by weight of third-layer polyester base material

The molecular weight of the first copolyester is 20000-40000, the first copolyester is prepared by copolycondensation of dicarboxylic acid and ethylene glycol, the dicarboxylic acid comprises 2, 6-naphthalenedicarboxylic acid, terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the 2, 6-naphthalenedicarboxylic acid, the terephthalic acid, the isophthalic acid and the phthalic acid is (1-10): (50-80): (0-5): (0-5); the viscosity of the third layer modified polyester base stock is 0.60 dL/g-0.80 dL/g;

the third layer of surface modification material comprises the following components in parts by weight:

0.1 to 10 weight portions of nano inorganic material

15 to 40 parts by weight of second copolyester

The molecular weight of the second copolyester is 20000-30000, the second copolyester is prepared by copolycondensation of phthalic acid and ethylene glycol, the phthalic acid is prepared by mixing terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the terephthalic acid to the isophthalic acid to the phthalic acid is 60: (15-35): and 5, the viscosity of the third layer surface modifier is between 0.60dL/g and 0.75 dL/g.

2. The release film base film for the low roughness MLCC process according to claim 1, wherein the nano inorganic material comprises one or more of nano silicon dioxide, nano barium sulfate, nano aluminum oxide, nano magnesium oxide, nano titanium dioxide, nano kaolin, and nano calcium carbonate.

3. The release film-based film for the low roughness MLCC process according to claim 1, wherein the thickness of the first layer is between 0.5 μm and 5 μm; the thickness of the second layer is 8-40 μm; the thickness of the third layer is 0.5-5 μm.

4. The release film-based film for the low roughness MLCC process according to claim 1, wherein the third layer polyester base material comprises one of PET, APET and CPET, the intrinsic viscosity of the third layer polyester base material is 0.60dL/g to 0.80dL/g, the melting point of the third layer polyester base material is 255 ℃ to 265 ℃, and the molecular weight of the third layer polyester base material is 20000 to 30000.

5. The release film base film for the low roughness MLCC process according to claim 1, wherein the first layer comprises the following components in parts by weight:

50-90 parts by weight of first layer modified 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 2um, and the second layer of polyester master batch consists of one of PET, APET and CPET.

6. The release film base film for the low roughness MLCC process according to claim 5, wherein the first layer modified polyester base material is one of PET, APET and CPET, and the first layer polyester master batch comprises one of PET, APET and CPET.

7. A method for preparing the release film base film for the low roughness MLCC process as claimed in any one of claims 1 to 6, which 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 modified 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 the second layer of raw materials 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 modified polyester base material

0-50 parts by weight of a third layer of surface modification material;

step S2: the first extruder, the second extruder and the third extruder are melted at a temperature of 265-300 ℃, the extrusion thickness of the first extruder is set to be 0.5-5 μm, the extrusion thickness of the second extruder is set to be 8-40 μm, the extrusion thickness of the third extruder is set to be 0.5-5 μm, and the first extruder, the second extruder and the third extruder are used for co-extruding a first layer, a second layer and a third layer;

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: 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 S5: and cooling the first layer, the second layer and the third layer at 30-35 ℃ and room temperature, and then rolling.

8. The process according to claim 7, characterized in that the longitudinal stretching is carried out in a longitudinal stretching section having a length of between 3m and 5m and a temperature of between 65 ℃ and 90 ℃, the transverse stretching is carried out in a transverse stretching section having a length of between 10m and 16m and a temperature of between 100 ℃ and 160 ℃, the heat setting is carried out in a heat setting section having a length of between 10m and 20 m.

9. The method of claim 7, wherein in the step S1, the composition and weight parts of the third layer modified polyester base material are as follows:

1 to 20 parts by weight of a first copolyester

49-80 parts by weight of third-layer polyester base material

The third layer of surface modification material comprises the following components in parts by weight:

0.1 to 10 weight portions of nano inorganic material

15 to 40 parts by weight of second copolyester

The first layer of modified polyester base material is one of PET, APET and CPET, the first layer of polyester master batch comprises one of PET, APET and CPET, and the second layer of raw material is one of PET, APET and CPET.

10. The method of claim 9, wherein the third layer of polyester substrate comprises one of PET, APET, CPET; the molecular weight of the first copolyester is 20000-40000, the first copolyester is prepared by copolycondensation of dicarboxylic acid and ethylene glycol, the dicarboxylic acid comprises 2, 6-naphthalenedicarboxylic acid, terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the 2, 6-naphthalenedicarboxylic acid, the terephthalic acid, the isophthalic acid and the phthalic acid is (1-10): (50-80): (0-5): (0-5); the molecular weight of the second copolyester is 20000-30000, the second copolyester is prepared by copolycondensation of phthalic acid and ethylene glycol, the phthalic acid is prepared by mixing terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the terephthalic acid to the isophthalic acid to the phthalic acid is 60: (15-35): 5.

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 low-roughness MLCC (multilayer ceramic chip carrier) 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 CN201910394068.5 discloses a preparation method of a high-matte polyester film, which comprises the steps of mixing 60-70 parts of poly (215 terephthalate), 15-25 parts of polybutylene terephthalate, 10-15 parts of polyethylene naphthalate and 3-5 parts of copolymerized modified polyester, granulating, mixing with titanium dioxide, drying, stretching, forming, irradiating by ultraviolet rays, and coating.

The invention discloses a silver-plated reflective film and a preparation method thereof, and relates to the technical field of reflective films, in particular to a small-size silver-plated reflective film and a preparation method thereof. The invention aims to solve the problems of high surface roughness and low adhesive force between a silver coating and a polyester film layer in the existing silver-coated reflecting film, has poor effect and cannot effectively solve the roughness problem.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a release film base film for a low-roughness MLCC (multilayer ceramic chip carrier) manufacturing process and a preparation method thereof. The invention adopts polyester and self-made surface modified material as raw materials, the surface modified material is composed of nano inorganic material and polyester, the nano inorganic material not only has opening function, but also can reduce the surface roughness of the polyester film; the method adopts an online coating mode to reduce the roughness of the membrane surface, and the specific technical scheme of the invention is as follows:

a release film base film for a low-roughness MLCC (multilayer ceramic chip carrier) manufacturing process comprises a first layer, a second layer and a third layer, wherein the third layer comprises the following components in parts by weight:

50-100 parts of third-layer modified polyester base material

0 to 50 parts by weight of third-layer surface modified material

The third layer of modified polyester base material comprises the following components in parts by weight:

1 to 20 parts by weight of a first copolyester

49-80 parts by weight of third-layer polyester base material

The molecular weight of the first copolyester is 20000-40000, the first copolyester is prepared by copolycondensation of dicarboxylic acid and ethylene glycol, the dicarboxylic acid comprises 2, 6-naphthalenedicarboxylic acid, terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the 2, 6-naphthalenedicarboxylic acid, the terephthalic acid, the isophthalic acid and the phthalic acid is (1-10): (50-80): (0-5): (0-5); the viscosity of the third layer modified polyester base stock is 0.60 dL/g-0.80 dL/g;

the third layer of surface modification material comprises the following components in parts by weight:

0.1 to 10 weight portions of nano inorganic material

15 to 40 parts by weight of second copolyester

The molecular weight of the second copolyester is 20000-30000, the second copolyester is prepared by copolycondensation of phthalic acid and ethylene glycol, the phthalic acid is prepared by mixing terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the terephthalic acid to the isophthalic acid to the phthalic acid is 60: (15-35): and 5, the viscosity of the third layer surface modifier is between 0.60dL/g and 0.75 dL/g.

As an improved technical scheme of the invention, the nano inorganic material comprises one or more of nano silicon dioxide, nano barium sulfate, nano aluminum oxide, nano magnesium oxide, nano titanium dioxide, nano kaolin and nano calcium carbonate.

As an improved technical scheme of the invention, the thickness of the first layer is between 0.5 and 5 microns; the thickness of the second layer is 8-40 μm; the thickness of the third layer is 0.5-5 μm.

As an improved technical scheme of the invention, the third layer of polyester base material comprises one of PET, APET and CPET, the intrinsic viscosity of the third layer of polyester base material is 0.60 dL/g-0.80 dL/g, the melting point of the third layer of polyester base material is 255-265 ℃, and the molecular weight of the third layer of polyester base material is 20000-30000.

As an improved technical scheme of the invention, the first layer comprises the following components in parts by weight:

50-90 parts by weight of first layer modified 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 2um, and the second layer of polyester master batch consists of one of PET, APET and CPET.

As an improved technical scheme of the invention, the first layer of modified polyester base stock is one of PET, APET and CPET, and the first layer of polyester master batch comprises one of PET, APET and CPET.

A method for preparing the release film base film for the low-roughness 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 modified 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 the second layer of raw materials 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 modified polyester base material

0-50 parts by weight of a third layer of surface modification material;

step S2: the first extruder, the second extruder and the third extruder are melted at a temperature of 265-300 ℃, the extrusion thickness of the first extruder is set to be 0.5-5 μm, the extrusion thickness of the second extruder is set to be 8-40 μm, the extrusion thickness of the third extruder is set to be 0.5-5 μm, and the first extruder, the second extruder and the third extruder are used for co-extruding a first layer, a second layer and a third layer;

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: 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 S5: 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 3m and 5m, the temperature is between 65 ℃ and 90 ℃, the transverse stretching is carried out on a transverse stretching section, the length of the transverse stretching section is between 10m and 16m, the temperature is between 100 ℃ and 160 ℃, the heat setting is carried out on a heat setting section, and the length of the heat setting section is between 10m and 20 m.

In step S1, the modified polyester base material of the third layer comprises the following components in parts by weight:

1 to 20 parts by weight of a first copolyester

49-80 parts by weight of third-layer polyester base material

The third layer of surface modification material comprises the following components in parts by weight:

0.1 to 10 weight portions of nano inorganic material

15 to 40 parts by weight of second copolyester

The first layer of modified polyester base material is one of PET, APET and CPET, the first layer of polyester master batch comprises one of PET, APET and CPET, and the second layer of raw material is one of PET, APET and CPET.

As an improved technical scheme of the invention, the third layer of polyester base material comprises one of PET, APET and CPET; the molecular weight of the first copolyester is 20000-40000, the first copolyester is prepared by copolycondensation of dicarboxylic acid and ethylene glycol, the dicarboxylic acid comprises 2, 6-naphthalenedicarboxylic acid, terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the 2, 6-naphthalenedicarboxylic acid to the terephthalic acid to the isophthalic acid to the phthalic acid is (1-10): (50-80): (0-5): (0-5); the molecular weight of the second copolyester is 20000-30000, the second copolyester is prepared by copolycondensation of phthalic acid and ethylene glycol, the phthalic acid is prepared by mixing terephthalic acid, isophthalic acid and phthalic acid, and the weight ratio of the terephthalic acid, the isophthalic acid and the phthalic acid is 60: (15-35): 5.

advantageous effects

(1) The third layer of the invention comprises a third layer of surface modification material, the third layer of surface modification material comprises 0.1 to 10 weight portions of nano inorganic material and 15 to 40 weight portions of second copolyester, the nano inorganic material is uniformly distributed on the surface of the film, and the problem of high roughness of the surface of the film is better solved because the particle size is small and the protruding height is small, compared with the existing method adopting micron-sized inorganic particles, the surface roughness is reduced to 10 to 20 nm;

(2) the first layer comprises 50-90 parts by weight of first layer modified polyester base stock and 10-50 parts by weight of first layer polyester master batch, the particle size of the first layer polyester master batch is below 2um, and the master batch is distributed on a non-processing surface, so that the stability of the opening performance and the good rolling operability of the product in the processing and using processes are ensured;

(3) the second layer of the invention adopts modified polyester base stock, which is mainly characterized in that the modified base stock contains a molecular chain segment with strong rigidity, thereby improving the stiffness of the film and effectively solving the problems of high warping degree and low stiffness of the film;

(4) the preparation process disclosed by the invention is simple and convenient, easy to operate, strong 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. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection 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.