Preparation method of regenerated polyester colorful colored film
阅读说明：本技术 一种再生聚酯多彩有色薄膜的制备方法 (Preparation method of regenerated polyester colorful colored film ) 是由 朱闻宇 陈烨 戴泽新 王华平 戴梦茜 柯福佑 袁震 徐平 康玉杰 陈晴 于 2020-07-28 设计创作，主要内容包括：发明涉及一种再生聚酯多彩有色薄膜的制备方法,首先对再生聚酯泡料进行清洗干燥,通过测色色差计,将再生聚酯泡料分类成20个等级。然后选择透明度相同,颜色误差处于同一等级的三种颜色的红、绿、蓝三种泡料。通过计算机算法将Lab模型数值转化成RGB模型。利用RGB原理,通过改变流速调控颜色,从而控制不同颜色在聚酯片材上的占比,再双轴拉伸,等比例放大,即得到满足多彩聚酯薄膜。(The invention relates to a preparation method of a regenerated polyester colorful colored film, which comprises the steps of cleaning and drying a regenerated polyester foam material, and classifying the regenerated polyester foam material into 20 grades through a colorimeter. And then selecting three foams of red, green and blue with the same transparency and the same color error. Converting Lab model values into RGB model by computer algorithm. The ratio of different colors on the polyester sheet is controlled by changing the flow rate to regulate the colors by utilizing the RGB principle, and then the polyester sheet is biaxially stretched and amplified in equal proportion to obtain the colorful polyester film.)
1. A preparation method of a regenerative polyester colorful and colored film is characterized by comprising the following steps: in the film process, the regenerated polyester melts with three colors are respectively conveyed by an R feed port, a G feed port and a B feed port, and the feeding time and the flow of each feed port are regulated and controlled to prepare a colorful and colored film with variable color;
the delta E' of the regenerated polyester melt and the corresponding color is less than or equal to 0.5;
the LAB values of the three colors are respectively: red (54,81, 70); green (88, -79, 81); blue (30,68, -112).
2. The method of claim 1, wherein the feed ports have equal cross-sectional areas.
3. The method of claim 2, wherein the sum of the feed flow rates of the polyester melts is kept constant during the continuous production of the film.
4. The recycled polyester as claimed in claim 3The preparation method of the colorful colored film is characterized in that the color change is gradually changed from a color a to a color b; the RGB color values for color a and color b are: color a (R)a，Ga，Ba) Color b (R)b，Gb，Bb)；
The feeding flow rate of each feeding hole of the regenerated polyester melt corresponding to the color a is as follows:
the feed inlet R is as follows:
the feed inlet G is:
the feed inlet B is as follows:
the feeding flow rate of each feeding hole of the regenerated polyester melt corresponding to the color b is as follows:
the feed inlet R is as follows:
the feed inlet G is:
the feed inlet B is as follows:
the regulation and control of the feeding time refer to that: the length of the colorful colored film corresponding to the color a or the color b is controlled by the feeding time corresponding to each color.
5. The method for preparing the recycled polyester multicolor colored film according to claim 4, wherein the recycled polyester melt is prepared by color matching of recycled polyester foam or recycled polyester chips.
6. The method for preparing a recycled polyester multicolor colored film according to claim 5, wherein the color matching is performed according to the RGB color matching principle after the LAB value is converted into the RGB value by using recycled polyester foam or recycled polyester chip with the same level of color difference as the raw material and adding color master batch or dye.
7. The method for preparing a recycled polyester colorful colored film according to claim 6, wherein the same level color difference means that an LAB color model and a color colorimeter are adopted to respectively compare the recycled polyester foam or the recycled polyester chip with three colors, and the color difference is divided into 5 levels, specifically:
firstly testing the Lab value of the recycled polyester foam or the recycled polyester slice;
and then calculating delta E': Δ E' ═ ((. DELTA.a)2+(△b)2)1/2Wherein, delta a is the difference between the a value in the LAB value of the regenerated polyester foam material or the regenerated polyester chip and the a value of the standard color, and delta b is the difference between the b value in the LAB value of the regenerated polyester foam material or the regenerated polyester chip and the b value of the standard color;
finally, determining the color grade as follows according to the Delta E':
when the value of delta E' is more than 0 and less than or equal to 0.5, the value is 1 grade;
when the value of delta E' is more than 0.5 and less than or equal to 1, the value is 2 grade;
when 1 < delta E' is less than or equal to 2, the grade is 3;
when 2 < delta E' is less than or equal to 4, the grade is 4;
when 4 <. DELTA.E', it is 5-grade.
8. The method for preparing a recycled polyester multicolor colored film according to claim 7, wherein the same level of color difference further comprises dividing the brightness into 4 levels according to the brightness difference, specifically:
when L is more than 0 and less than or equal to 25, the grade is I;
when L is more than 25 and less than or equal to 50, the grade is II;
when L is more than 50 and less than or equal to 75, the product is grade III;
when L is more than 75 and less than or equal to 100, the grade is IV.
Technical Field
The invention belongs to the technical field of agricultural film preparation, and relates to a preparation method of a regenerated polyester colorful colored film.
Background
The research and practice of scientists prove that the light sources with various colors have special stimulation effect on crops, and are not only suitable for the cultivation of vegetables, fruit trees and flowers, but also suitable for field crops and greenhouse production. Therefore, the colored film is widely applied in agriculture at present. However, the single-color colored film is suitable for large-scale planting of agricultural products with the same light demand, and for agricultural products with different light demands planted on the same land, the single-color colored film cannot meet the requirement, so that the colorful colored film needs to be prepared.
The polyethylene terephthalate (PET) material has excellent comprehensive performances of high mechanical strength, good optical performance, wide application temperature range, folding resistance, corrosion resistance and the like, and is widely applied to the aspect of foreign agricultural greenhouse film materials. In China, due to the problem of cost, PE and PVC films are mainly used in agriculture. The film is prepared by using the recycled polyester raw material, so that the cost can be reduced, and the problem can be well overcome. The traditional preparation method of the colored film is usually produced by adopting a tape casting or biaxial stretching method, and color master batches are added on the basis of preparing the transparent film, but the performance of the colored film is greatly reduced after the content of the added color master batches exceeds a certain proportion. There is also a method of coating a desired pigment on a polyester film using a coating method, and although it is possible to coat different colors on adjacent regions, the process is complicated and the cost is increased, and the thickness of the film to be coated is more than 2um, so that it is impossible to prepare an ultra-thin film.
Therefore, the preparation method of the recycled polyester film with simple operation and adjustable color has very important significance.
Disclosure of Invention
The invention aims to provide a preparation method of a regenerative polyester colorful colored film;
in order to achieve the purpose, the scheme of the invention is as follows:
in the film process, regenerated polyester melts with three colors are respectively conveyed by an R feed port, a G feed port and a B feed port, and the feeding time and the flow of each feed port are regulated and controlled to prepare the colorful and colored film with variable color;
the delta E' of the regenerated polyester melt and the corresponding color is less than or equal to 0.5; Δ E' ═ ((. DELTA.a)2+(△b)2)-2Wherein, delta a is the difference of a value in LAB value of the regenerated polyester melt and a value of a standard color, and delta b is the difference of b value in LAB value of the melt and b value of the standard color; the colors of the regenerated polyester melt and the colors corresponding to the regenerated polyester melt are that the red regenerated polyester melt corresponds to standard red, the green regenerated polyester melt corresponds to standard green, and the blue regenerated polyester melt corresponds to standard blue;
the LAB values of the three colors are respectively: standard red (54,81, 70); standard green (88, -79, 81); standard blue (30,68, -112), L controls brightness, a, b controls color.
As a preferred technical scheme:
according to the preparation method of the recycled polyester multicolor colored film, the cross sectional areas of the feeding holes are equal.
According to the preparation method of the regenerated polyester colorful colored film, in the film process of continuous production, the sum of the feeding flow rates of the polyester melts is kept unchanged.
In the preparation method of the recycled polyester multicolor colored film, the color change is gradually changed from the color a to the color b; the RGB color values for color a and color b are: color a (R)a，Ga，Ba) Color b (R)b，Gb，Bb)；
The feeding flow rate of each feeding hole of the regenerated polyester melt corresponding to the color a is as follows:
the feed inlet R is as follows:parts per second;
the feed inlet G is:
the feed inlet B is as follows:parts per second;
the feeding flow rate of each feeding hole of the regenerated polyester melt corresponding to the color b is as follows:
the feed inlet R is as follows:
the feed inlet G is:parts per second;
the feed inlet B is as follows:
the regulation and control of the feeding time refer to that: the length of the colorful colored film corresponding to the color a or the color b is controlled by the feeding time corresponding to each color.
According to the preparation method of the regenerated polyester colorful and colored film, the regenerated polyester melt is a regenerated polyester foam material or a regenerated polyester slice and is prepared after color matching.
The color matching of the preparation method of the regenerated polyester multicolor colored film refers to that the regenerated polyester foam or the regenerated polyester chip with the same level of color difference (preferably, the color grade and the brightness grade are the same) is used as a raw material, color master batches or dyes are added into the raw material, an LAB value is converted into an RGB value, and then the color matching is carried out according to the RGB color matching principle.
In the preparation method of the regenerated polyester colorful colored film, the same-level color difference means that an LAB color model and a color colorimeter are adopted to respectively compare the regenerated polyester foam or the regenerated polyester chip with three colors, and the color difference is divided into 5 levels, specifically:
firstly testing the Lab value of the recycled polyester foam or the recycled polyester slice;
and then calculating delta E': Δ E' ═ ((. DELTA.a)2+(△b)2)1/2Wherein, delta a is the difference between the a value in the LAB value of the regenerated polyester foam material or the regenerated polyester chip and the a value of the standard color, and delta b is the difference between the b value in the LAB value of the regenerated polyester foam material or the regenerated polyester chip and the b value of the standard color;
finally, determining the color grade as follows according to the Delta E':
when the value is more than 0 and less than or equal to 0.5, the color is 1 grade (the color error is slight);
when the value is 0.5 <. DELTA.E' ≦ 1, the color is 2 grade (the color error is slight to medium);
when 1 < delta E' is less than or equal to 2, the color is 3 grades (in color error, and the like);
when 2 < delta E' is less than or equal to 4, the color is 4-grade (large color error);
when 4 <. DELTA.E', it is of order 5 (color error is very large).
According to the preparation method of the regenerated polyester colorful and colored film, the same-level color difference also comprises the step of dividing the brightness into 4 levels according to the brightness difference, specifically: the brightness range of L is 0-100;
when L is more than 0 and less than or equal to 25, the grade is I;
when L is more than 25 and less than or equal to 50, the grade is II;
when L is more than 50 and less than or equal to 75, the product is grade III;
when L is more than 75 and less than or equal to 100, the grade is IV.
The principle of the invention is as follows:
the equipment is provided with three feeding holes, raw materials of three colors are placed in the three feeding holes, color mixing is carried out through a color sensor and an automatic feeding sensor, and then color mixing is carried out by controlling the flow of three color melts through a computer program. Keeping the total melt flow unchanged, and adjusting the flow proportion of the three melts based on the RGB principle, thereby achieving the effect of changing the color of the regenerated polyester film; the flow rate time of a certain color can be controlled by a computer, the proportion of the color on the polyester sheet is increased, and the proportion of the color on the film is increased.
In the RGB three-primary-color principle, the intensity values of the three color components are respectively set to be within a numerical range of 0-255, and the intensity values of the three color components are formed by overlapping different proportions of three primary colors, so that the flow rates of three primary-color materials (namely red, green and blue raw materials) corresponding to the three color components are respectively set to be within a numerical range of 0-255 parts/s by utilizing the RGB three-primary-color principle, and the total flow rate of the three primary colors is changed to be 0-765 parts/s (1 part can be 1-100 g or 1-100 ml). The feed amounts for the respective colors were dispensed through the flow rate ratios Ra: Ga: Ba of the three feed ports. As the flow rate ratio of the three feed inlets corresponding to the three primary colors is Ra, Ga and Ba, the corresponding relation between the flow rate and the color is formed, and the corresponding relation is specifically as follows: when the flow rate ratios of the three feeding holes are changed, the flow rates of the corresponding three-primary-color materials are changed, the intensity values of the three color components are changed, and the color of the melt (formed by the sum of the three-primary-color materials) is changed.
Therefore, by controlling the flow rates of the three primary color materials corresponding to the three color components, the melt with gradually changed colors can be obtained, and further the regenerated polyester film with changed colors can be obtained.
When the flow rates of three feed inlets corresponding to three primary colors are adjusted, the total time t of color change is setGeneral assemblyDue to the total time tGeneral assemblyAnd the flow rate is in the relation of variable and dependent variable, therefore, the invention sets the flow rate of the three-primary-color material at the corresponding time point at the specific time point to realize the change of the flow rate and then the change of color, thereby obtaining the regenerated polyester multicolor film.
Has the advantages that:
(1) the invention prepares the regenerated polyester colorful colored film by online color matching on the basis of the regenerated polyester raw material.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the film process, a R feed port, a G feed port and a B feed port are respectively used for conveying regenerated polyester melts (prepared by mixing colors of regenerated polyester foam materials or regenerated polyester slices) with three colors, the feeding time and the flow of each feed port are regulated and controlled (the cross sectional areas of the feed ports are equal, and the sum of the feeding flows of the polyester melts is kept unchanged), and the colorful and colored film with changed color is prepared;
the delta E' of the regenerated polyester melt and the corresponding color is less than or equal to 0.5; Δ E' ═ ((. DELTA.a)2+(△b)2)1/2Wherein, delta a is the difference of a value in LAB value of the regenerated polyester melt and a value of a standard color, and delta b is the difference of b value in LAB value of the melt and b value of the standard color;
the LAB values of the three colors are respectively: red (54,81, 70); green (88, -79, 81); blue (30,68, -112), L controls brightness, a, b controls color.
Color change means a gradual change from color a to color b; the RGB color values for color a and color b are: color a (R)a，Ga，Ba) Color b (R)b，Gb，Bb)；
The feeding flow rate of each feeding hole of the regenerated polyester melt corresponding to the color a is as follows:
the feed inlet R is as follows:
the feed inlet G is:
the feed inlet B is as follows:
the feeding flow rate of each feeding hole of the regenerated polyester melt corresponding to the color b is as follows:
the feed inlet R is as follows:parts per second;
the feed inlet G is:
the feed inlet B is as follows:parts per second;
the regulation and control of the feeding time refer to that: the length of the colorful colored film corresponding to the color a or the color b is controlled by the feeding time corresponding to each color.
The color matching is carried out according to the RGB color matching principle after the LAB value is converted into the RGB value by taking the recycled polyester foam or the recycled polyester chip with the same level of color difference (preferably, the color grade and the brightness grade are the same) as the raw material and adding color master batches or dyes into the raw material.
The same-grade color difference means that an LAB color model and a color measurement colorimeter are adopted to respectively compare the recycled polyester foam or the recycled polyester chip with three colors, and the recycled polyester foam or the recycled polyester chip is divided into 5 grades according to the color difference, specifically:
firstly testing the Lab value of the recycled polyester foam or the recycled polyester slice;
and then calculating delta E': Δ E' ═ ((. DELTA.a)2+(△b)2)1/2Wherein, delta a is the difference between the a value in the LAB value of the regenerated polyester foam material or the regenerated polyester chip and the a value of the standard color, and delta b is the difference between the b value in the LAB value of the regenerated polyester foam material or the regenerated polyester chip and the b value of the standard color;
finally, determining the color grade as follows according to the Delta E':
when the value of delta E' is more than 0 and less than or equal to 0.5, the value is 1 grade;
when the value of delta E' is more than 0.5 and less than or equal to 1, the value is 2 grade;
when 1 < delta E' is less than or equal to 2, the grade is 3;
when 2 < delta E' is less than or equal to 4, the grade is 4;
when 4 <. DELTA.E', it is 5-grade.
The same-level color difference also includes dividing the brightness into 4 levels according to the brightness difference, specifically: the brightness range of L is 0-100;
when L is more than 0 and less than or equal to 25, the grade is I;
when L is more than 25 and less than or equal to 50, the grade is II;
when L is more than 50 and less than or equal to 75, the product is grade III;
when L is more than 75 and less than or equal to 100, the grade is IV.
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