阅读说明：本技术 高亮白色半透光聚酯薄膜及其生产方法 (High-brightness white semi-transparent polyester film and production method thereof ) 是由 何志彪 周健 黄亦迎 冯黎明 邓倩瑜 招洛彬 于 2020-08-04 设计创作，主要内容包括：本发明涉及一种高亮白色半透光聚酯薄膜及其生产方法,其采用三层结构,中间层为白色半透层,两侧表层为透明高亮层。在保持之前半透性能的基础上,膜表层使用增亮改性,已达到表层高亮结构；同时在对基础原料改性及工艺技术进行调整,使产品的厚度范围得到拓宽,满足客户特殊领域的使用要求。(The invention relates to a high-brightness white semi-transparent polyester film and a production method thereof. On the basis of keeping the prior semi-permeability, the surface layer of the membrane is brightened and modified to achieve a high-brightness structure of the surface layer; meanwhile, the modification of the basic raw materials and the adjustment of the process technology are carried out, so that the thickness range of the product is widened, and the use requirements of customers in special fields are met.)

1. A white semi-transparent polyester film is characterized in that the film has a thickness range of 6-350 mu m.

2. The white semi-transparent polyester film according to claim 1, which has a thickness of 6 μm,25 μm,50 μm,150 μm,250 μm,350 μm.

3. The white semi-transparent polyester film according to claim 1 or 2, which has a three-layer structure.

4. The white semi-transparent polyester film as claimed in claim 3, wherein the middle layer of the three-layer structure is a white semi-transparent layer, and the surface layers on both sides are transparent high-brightness layers.

5. The white translucent polyester film of claim 4, wherein the thickness of the intermediate white translucent layer is about 70-92% of the whole thickness, the layer structure comprises 80-95 wt% of polyester base material, 5-20 wt% of inorganic particles and modification auxiliary agent, the inorganic particles are mainly one or combination of titanium dioxide, barium sulfate, calcium carbonate and kaolin, and the auxiliary agent comprises fluorescent whitening agent and novel organic dispersant.

6. The white translucent polyester film as claimed in claim 4, wherein the surface layer of said polyester film is a transparent highlight layer, the thickness of said transparent highlight layer is about 4-15% of the whole thickness, said film layer structure is composed of 90-99.8 wt% of polyester base material, 0.2-10 wt% of silane coupling agent modified silica particles and organic dispersing agent, the average particle size of said silica particles is 1 μm, and the master batch is one or combination of germanium catalyst and titanium catalyst.

7. A preparation method of a white semi-transparent polyester film uses a three-layer co-extrusion technology and carries out shearing, melting and extrusion in an extruder at the temperature of 230-300 ℃.

8. The method for preparing a white semi-transparent polyester film as claimed in claim 7, wherein the extruded melt is attached to a cooling drum by high pressure, and the melt is sufficiently cooled to obtain a uniform sheet structure.

9. The method for preparing a white semi-transparent polyester film as claimed in claim 7, wherein the polyester sheet is preheated to a temperature exceeding the glass transition temperature of the polyester by infrared and preheating rolls, longitudinally stretched at a longitudinal stretching ratio of 2 to 4 times under an infrared lamp, and then cooled and set.

10. The method for preparing the white semi-transparent polyester film as claimed in claim 7, wherein the film is transversely preheated, stretched at a transverse stretching ratio of 2-5 times, shaped at a temperature of 150-240 ℃, cooled, and corona-wound to prepare a product with a thickness of 6-350 μm.

Technical Field

The invention relates to a material technology, in particular to a high-brightness white semi-transparent polyester film and a production method thereof, belonging to the field of civil high polymer materials. The product is mainly used in the fields of packaging, decorative materials, electronic materials and teaching and office equipment industries, such as labels, clothes sequins, office whiteboards and the like.

Background

The white semitransparent polyester film is a common civil high molecular material and is widely applied to the packaging industry and the advertising industry.

The conventional white semi-transparent polyester film has limited product thickness range, which is usually limited within the range of 75-250 μm due to insufficient dispersibility. With the wide expansion of the application of the materials, the thickness of the materials can not meet the requirement of practical application. Therefore, improving film characteristics, processes, and structures is a technical problem to be solved in the art.

Disclosure of Invention

The invention is an improvement invention to white semi-transparent polyester film and its production method, the prior art limits the development of ultra-thin and ultra-thick products because of insufficient dispersibility, this time on the basis of improving dispersibility, process structure and production technology, the thickness range is widened, this development will expand the use of this type of products greatly.

The invention uses a three-layer structure, the concrete structure is shown in figure 1, the middle (1) is a white semi-transparent layer, and the two sides (2) are transparent high-brightness layers. On the basis of keeping the prior semi-permeability, the structure uses brightening modification on the surface layer of the membrane to achieve a structure with a highlighted surface layer, and after the surface layer is brightened, the appearance of the membrane surface is changed from dim to highlight, so that the use requirement of special purposes of customers is met.

Meanwhile, the thickness range of the product is expanded from 75-250 mu m to 6-350 mu m, and the expansion of the thickness greatly widens the application field of the product.

After raw material modification and process adjustment, the ultra-thick and ultra-thin semi-transparent products which cannot be normally produced due to membrane rupture can also be successfully produced, and the extension of the product application is brought by the widening of the thickness; the product structure is adjusted to be a three-layer structure, the flexibility of the surface layer structure can be realized, and common or highlight customization can be carried out according to the use requirements of customers.

The specific preparation process and performance parameters of the product are shown in the following examples.

Drawings

Fig. 1 is a three-layer structure diagram, wherein 1 is a white semi-transparent layer, and 2 is a transparent high-brightness layer.

Detailed Description