阅读说明：本技术 一种长效低表面能双向拉伸ttr聚酯基膜及其制备方法 (Long-acting low-surface-energy biaxially-oriented TTR polyester base film and preparation method thereof ) 是由 胡爱华 周俊 张峻 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种长效低表面能双向拉伸TTR聚酯基膜,由上表层、芯层及下表层构成,所述芯层为PET聚酯切片；所述上表层和下表层的原料按重量份均由30-70份PET聚酯母料、5-20份改性母粒和10-65份PET聚酯切片组成；所述PET聚酯母料为含有0.03-0.04wt％二氧化硅的PET聚酯切片；所述改性母粒为含有5-10wt％氧化锡锑的PET聚酯切片。本发明还公开了上述长效低表面能双向拉伸TTR聚酯基膜的制备方法。本发明表面电阻小且均匀,并具有长效的特点,在后续加工环节中具有油墨分散性好,无质量问题“白斑”的困扰,充分提高了生产效率,降低了损耗。(The invention discloses a long-acting low-surface-energy two-way stretching TTR polyester base film, which consists of an upper surface layer, a core layer and a lower surface layer, wherein the core layer is a PET polyester chip; the raw materials of the upper surface layer and the lower surface layer consist of 30-70 parts of PET polyester master batch, 5-20 parts of modified master batch and 10-65 parts of PET polyester chips according to parts by weight; the PET polyester master batch is PET polyester chips containing 0.03-0.04 wt% of silicon dioxide; the modified master batch is PET polyester chip containing 5-10 wt% of tin antimony oxide. The invention also discloses a preparation method of the long-acting low-surface-energy biaxially oriented TTR polyester base film. The invention has the characteristics of small and uniform surface resistance and long-acting effect, has good ink dispersibility in subsequent processing links, has no trouble of white spots in quality, fully improves the production efficiency and reduces the loss.)

1. A long-acting low surface energy biaxial stretching TTR polyester basal membrane is composed of an upper surface layer, a core layer and a lower surface layer, and is characterized in that the core layer is a PET polyester chip; the raw materials of the upper surface layer and the lower surface layer consist of 30-70 parts of PET polyester master batch, 5-20 parts of modified master batch and 10-65 parts of PET polyester chips according to parts by weight; the PET polyester master batch is PET polyester chips containing 0.03-0.04 wt% of silicon dioxide; the modified master batch is PET polyester chip containing 5-10 wt% of tin antimony oxide.

2. The long acting low surface energy biaxially oriented TTR polyester based film of claim 1, wherein the particle size of the tin antimony oxide is 10-30 nm; preferably, the particle size of the silica is 2.8-3.5 μm.

3. The long acting low surface energy biaxially stretched TTR polyester based film of claim 1 or 2, wherein the long acting low surface energy biaxially stretched TTR polyester based film has a thickness of 4.4 to 4.6 μm.

4. A method of making a long acting low surface energy biaxially oriented TTR polyester based film according to any of claims 1-3 comprising the steps of:

s1, drying the core layer by using PET (polyethylene terephthalate) chips, heating for melting, and filtering to obtain a core layer melt;

s2, uniformly mixing the raw materials of the upper surface layer and the lower surface layer according to the parts by weight, heating for melting, vacuumizing, and filtering to respectively obtain an upper surface layer melt and a lower surface layer melt; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer die head to prepare a mixed melt; the mixed melt is subjected to cold roll and high-voltage electrostatic attachment to obtain a cast sheet;

s3, longitudinally stretching the cast sheet to obtain a thick sheet, transversely stretching, performing heat setting to obtain a film, drawing, rolling and slitting, and eliminating the static electricity on the surface of the film in the drawing, rolling and slitting processes to obtain the long-acting low-surface-energy biaxially oriented TTR polyester base film.

5. The method for preparing long-acting low surface energy biaxially oriented TTR polyester film as claimed in claim 4, wherein in S3, the preheating temperature for longitudinal stretching is 40-95 ℃, the stretching temperature is 101-103 ℃, and the stretching ratio is 3.7-4.0.

6. The method for preparing long-acting low surface energy biaxially oriented TTR polyester film as claimed in claim 4 or 5, wherein in S3, the preheating temperature for transverse stretching is 95-105 ℃, the stretching temperature is 105-110 ℃, and the stretching ratio is 3.6-3.8 times.

7. The method of preparing a long-acting low surface energy biaxially oriented TTR polyester film as claimed in any one of claims 4 to 6, wherein the heat-setting temperature in S3 is 232-238 ℃.

8. The method of making a long acting low surface energy biaxially oriented TTR polyester based film according to any of claims 4 to 7 wherein in S3, platinum is added as a catalyst during heat setting; preferably, in S1, S2, the filtration pore size is 10-15 μm.

9. The method for preparing long-acting low surface energy biaxially oriented TTR polyester-based film according to any of claims 4-8, wherein the drying temperature is 150-160 ℃ and the drying time is 4-6h in S1.

10. The process for the preparation of long acting low surface energy biaxially oriented TTR polyester based film according to any of claims 4 to 9 wherein the extrusion temperature in S2 is 275 ℃ and 285 ℃.

Technical Field

The invention relates to the technical field of polyester base films, in particular to a long-acting low-surface-energy biaxially oriented TTR polyester base film and a preparation method thereof.

Background

The film used for TTR printing is a special carbon tape that prints bar codes and text information on labels. The TTR carbon belt requires low surface energy of a base film in the preparation process, otherwise, the dispersion of an adhesive on the surface of the film is not facilitated in the coating link, and when a high surface energy region is formed on the surface of the film, the adhesive can be dispersed to a low surface energy position, so that the ink cannot be adhered to the base film, the quality is poor, and the production loss is generated. Because in the coating link, fast, be difficult to discover, probably flow into next process with the defective products, produce more defective products. The common TTR carbon ribbon needs to pay great attention to poor coating in the preparation process: the phenomenon of white spots is avoided, and corresponding treatment is carried out in time to reduce loss, but the production efficiency is inevitably influenced.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a long-acting low-surface-energy biaxially-oriented TTR polyester base film and a preparation method thereof.

The invention provides a long-acting low-surface-energy two-way stretching TTR polyester base film, which consists of an upper surface layer, a core layer and a lower surface layer, wherein the core layer is a PET polyester chip; the raw materials of the upper surface layer and the lower surface layer consist of 30-70 parts of PET polyester master batch, 5-20 parts of modified master batch and 10-65 parts of PET polyester chips according to parts by weight; the PET polyester master batch is PET polyester chips containing 0.03-0.04 wt% of silicon dioxide; the modified master batch is PET polyester chip containing 5-10 wt% of tin antimony oxide.

Preferably, the particle size of the tin antimony oxide is 10-30 nm.

Preferably, the particle size of the silica is 2.8-3.5 μm.

Preferably, the particle size of the silica is 3.0 μm.

Preferably, the long acting low surface energy biaxially oriented TTR polyester based film has a thickness of 4.4 to 4.6 μm.

The invention also provides a preparation method of the long-acting low-surface-energy biaxially oriented TTR polyester base film, which comprises the following steps:

s1, drying the core layer by using PET (polyethylene terephthalate) chips, heating for melting, and filtering to obtain a core layer melt;

s2, uniformly mixing the raw materials of the upper surface layer and the lower surface layer according to the parts by weight, heating for melting, vacuumizing, and filtering to respectively obtain an upper surface layer melt and a lower surface layer melt; converging and extruding the core layer melt, the upper surface layer melt and the lower surface layer melt in a three-layer die head to prepare a mixed melt; the mixed melt is subjected to cold roll and high-voltage electrostatic attachment to obtain a cast sheet;

s3, longitudinally stretching the cast sheet to obtain a thick sheet, transversely stretching, performing heat setting to obtain a film, drawing, rolling and slitting, and eliminating the static electricity on the surface of the film in the drawing, rolling and slitting processes to obtain the long-acting low-surface-energy biaxially oriented TTR polyester base film.

Preferably, in S3, the preheating temperature for longitudinal stretching is 40-95 ℃, the stretching temperature is 101-103 ℃, and the stretching ratio is 3.7-4.0 times.

Preferably, in S3, the preheating temperature for transverse stretching is 95-105 ℃, the stretching temperature is 105-110 ℃, and the stretching ratio is 3.6-3.8 times.

Preferably, in S3, the heat-setting temperature is 232-238 ℃.

Preferably, in S3, platinum is added as a catalyst during heat setting.

Preferably, in S1, S2, the filtration pore size is 10-15 μm.

Preferably, in S1, the drying temperature is 150-160 ℃, and the drying time is 4-6 h.

Preferably, in S2, the extrusion temperature is 275-285 ℃.

The invention optimizes and improves the film formula and the production process, and proper modified master batches are added into the polyester master batch and the PET polyester chip and are matched with each other, so that the TTR base film has small surface resistance, low static value and long-acting property, is very beneficial to the coating link in the TTR preparation, and can avoid the quality problems of white spots and the like; in the production process, the filtering aperture is 10-15 μm, and most impurities in the melt can be filtered; removing oligomers in the film by using a catalyst platinum during heat setting; and an active static removing device is used for eliminating the static electricity on the surface of the film in the traction winding link and the slitting link, and proper processes such as extrusion, stretching, heat setting and the like are matched, so that the prepared long-acting low-surface-energy biaxially oriented TTR polyester base film has the characteristics of small and uniform surface resistance and long acting, has the advantages of good ink dispersibility and no puzzlement of 'white spots' in the subsequent processing link, fully improves the production efficiency and reduces the loss.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to specific examples.