阅读说明：本技术 一种极细金银丝薄膜及其制备方法 (Ultra-fine metallic yarn film and preparation method thereof ) 是由 窦发军 于 2021-08-20 设计创作，主要内容包括：本发明涉及一种极细金银丝薄膜及其制备方法,包括PET基层、过渡涂层和镀铝层,过渡涂层附着在PET基层表面,镀铝层附着在过渡涂层表面；将PET母粒投入双螺杆挤出机挤出造粒,得到粒料,熔融,在转动的冷却辊上形成无定型的厚片,将冷却后的厚片预热后,拉伸,拉伸速度为310m/m i n,将拉伸后的薄膜热定型,冷却后制得PET基层；在PET基层表面热固化制备出过渡涂层；在过渡涂层表面真空镀铝,形成厚度为0.05-0.08μm的镀铝层；提高制备出的过渡涂层与镀铝层的附着力,防止在制备极细金银线时出现铝层脱落等现象,而且化合物a和化合物b中均未出现苯环结构,使其不会在固化时发生黄变现象,影响美观和性能。(The invention relates to a superfine metallic yarn film and a preparation method thereof, and the superfine metallic yarn film comprises a PET (polyethylene terephthalate) base layer, a transition coating and an aluminum-plated layer, wherein the transition coating is attached to the surface of the PET base layer, and the aluminum-plated layer is attached to the surface of the transition coating; putting the PET master batch into a double-screw extruder for extrusion granulation to obtain granules, melting, forming an amorphous thick sheet on a rotating cooling roller, preheating the cooled thick sheet, stretching at a stretching speed of 310m/m i n, performing heat setting on the stretched film, and cooling to obtain a PET base layer; thermally curing the surface of the PET base layer to prepare a transition coating; vacuum aluminizing the surface of the transition coating to form an aluminized layer with the thickness of 0.05-0.08 mu m; the adhesive force of the prepared transition coating and the aluminum plating layer is improved, the phenomena of aluminum layer falling off and the like during the preparation of the ultrafine gold and silver wires are prevented, and no benzene ring structure exists in the compound a and the compound b, so that the phenomenon of yellowing during curing is avoided, and the attractiveness and the performance are not influenced.)

1. The utility model provides a superfine metallic yarn film, includes PET basic unit, transition coating and aluminized layer, and the transition coating is attached to PET basic unit surface, and the aluminized layer is attached to transition coating surface, and its characterized in that, the transition coating includes that following step makes:

step S1, adding polyethylene glycol 400 into dichloromethane, stirring at a constant speed until the polyethylene glycol is dissolved, then sequentially adding p-toluenesulfonyl chloride and pyridine, stirring at a constant speed and reacting for 24 hours, washing for three times, combining organic layers to obtain a crude product, and purifying to obtain an intermediate 1;

s2, placing the intermediate 1 in a reaction kettle, adding ammonia water, heating to 140 ℃ and 145 ℃, carrying out closed reaction for 6h, cooling to room temperature, extracting, and carrying out vacuum drying to obtain an intermediate 2;

step S3, adding the intermediate 2 into a four-neck flask, introducing nitrogen to discharge air, adding tetrabutylammonium bromide, heating to 45-50 ℃, magnetically stirring, slowly dropwise adding diethyl maleate, heating to 75 ℃ after dropwise adding, carrying out heat preservation reaction for 12 hours, washing with water, and separating liquid to obtain a compound b;

and step S4, uniformly mixing the compound a and the compound b according to the molar ratio of 1: 1, stirring at a high speed for 5min, coating on the surface of a PET base layer, and curing at 100 ℃ to form a film, thereby preparing the transition coating.

2. The ultrafine filigree film as set forth in claim 1, wherein: the compound a is prepared by the following steps: adding hexamethylene diisocyanate into a three-neck flask under the nitrogen atmosphere, heating to 65 ℃ after magnetically stirring for 10min, slowly dropwise adding a catalyst solution, heating to 75-100 ℃, keeping the temperature, stirring at a constant speed, reacting, measuring the isocyanate content of the system every 1h, adding benzoyl chloride when the isocyanate content is reduced to 30-35%, continuing stirring for 30min, and stopping the reaction to obtain the compound a.

3. The ultrafine filigree film as set forth in claim 2, wherein: the amount of the catalyst solution is controlled to be 0.5-0.8% of the weight of hexamethylene diisocyanate, and the amount of benzoyl chloride is 1% of the weight of hexamethylene diisocyanate.

4. The ultrafine filigree film as set forth in claim 1, wherein: in step S1, the molar ratio of polyethylene glycol 400 to p-toluenesulfonyl chloride is controlled to be 1: 2, the weight ratio of polyethylene glycol 400 to dichloromethane is controlled to be 1: 5, and the amount of pyridine is 30-50% of the weight of polyethylene glycol 400.

5. The ultrafine filigree film as set forth in claim 1, wherein: in the step S2, the mass ratio of the intermediate 1 to the ammonia water with the mass fraction of 25% is controlled to be 0.1: 10.

6. The ultrafine filigree film as set forth in claim 1, wherein: in step S3, the molar ratio of the intermediate 2 to diethyl maleate is controlled to be 1: 2, and the amount of tetrabutylammonium bromide is 1-3.5% of the weight of the intermediate 2.

7. The ultrafine filigree film as set forth in claim 1, wherein: the aluminum-plated layer is an aluminum film layer with the thickness of 0.05-0.08 mu m formed on the surface of the transition coating by adopting a vacuum aluminum-plating method.

8. The method for preparing the ultrafine filigree film according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:

firstly, preparing a PET base layer: putting the PET master batch into a double-screw extruder for extrusion granulation to obtain granules, melting, forming an amorphous thick sheet on a rotating cooling roller, preheating the cooled thick sheet, stretching at a stretching speed of 310m/min, performing heat setting on the stretched film, and cooling to obtain a PET base layer;

secondly, thermally curing the surface of the PET base layer to prepare a transition coating;

and thirdly, vacuum aluminizing is carried out on the surface of the transition coating to form an aluminized layer.

9. The method for preparing the ultrafine metallic yarn film as claimed in claim 8, wherein: the stretching in the first step comprises longitudinal stretching and transverse stretching, the stretching ratio is 1.65 multiplied by 2.46, the longitudinal stretching is 2.0 to 4.4 times, the transverse stretching is 2.5 to 4.5 times, and the transverse stretching temperature is 105-120 ℃.

Technical Field

The invention belongs to the technical field of metallic yarn films, and particularly relates to a superfine metallic yarn film and a preparation method thereof.

Background

The metallic yarn cuts the PET polyester film with higher color into superfine yarn by a physical method. The metallic yarns are fine yarns formed by twisting metallic yarns and polyester or rayon yarns. The method is mainly used for computer embroidery and technological accessories. The material is widely applied to industries of artware, fashion, embroidery, gift packaging and the like and processing of products such as knitting wool, yarn, knitted fabric, warp knitted fabric, woven fabric, clothing accessories, decorative cloth, sofa cloth and the like, and is an ideal lining decoration raw material.

The metallic yarn film is mainly 12um thick, is a common polyester film, and has been well-developed in processing and production processes. The thickness of the ultra-fine metallic filament film is 4.5-6um, the most extensive application is a thermal transfer carbon tape base film, and the adhesion force of an aluminum layer and a base layer is poor when the ultra-fine metallic filament film is used as a metallic filament, so that phenomena such as dealumination and the like occur, and the application of the metallic filament is influenced.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide an ultra-fine metallic yarn film and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

the ultra-fine metallic yarn film comprises a PET (polyethylene terephthalate) base layer, a transition coating and an aluminum coating, wherein the transition coating is attached to the surface of the PET base layer, the aluminum coating is attached to the surface of the transition coating, and the transition coating is prepared by the following steps:

step S1, adding hexamethylene diisocyanate into a three-neck flask under the nitrogen atmosphere, heating to 65 ℃ after magnetically stirring for 10min, slowly adding a catalyst solution dropwise, heating to 75-100 ℃, keeping the temperature, stirring at a constant speed and reacting, measuring the isocyanate content of the system by using a di-n-butylamine method every 1h, adding benzoyl chloride when the isocyanate content is reduced to 30-35%, continuing stirring for 30min, and stopping the reaction to obtain a compound a, wherein the dosage of the catalyst solution is 0.5-0.8% of the weight of the hexamethylene diisocyanate, and the dosage of the benzoyl chloride is 1% of the weight of the hexamethylene diisocyanate;

in step S1, hexamethylene diisocyanate is reacted under the action of a catalyst to prepare compound a, and the reaction process is as follows:

step S2, adding polyethylene glycol 400 into dichloromethane, stirring at a constant speed until the polyethylene glycol 400 is dissolved, then sequentially adding p-toluenesulfonyl chloride and pyridine, stirring at a constant speed and reacting for 24 hours, washing three times with dilute hydrochloric acid with the mass fraction of 10%, combining organic layers to obtain a crude product, adding the crude product into tetrahydrofuran, adding excessive diethyl ether, freezing at 0 ℃ for 10 hours, precipitating, filtering, decompressing and drying to obtain an intermediate 1, controlling the molar ratio of the polyethylene glycol 400 to the p-toluenesulfonyl chloride to be 1: 2, controlling the weight ratio of the polyethylene glycol 400 to the dichloromethane to be 1: 5, and using the pyridine in an amount of 30-50% of the weight of the polyethylene glycol 400;

in the step S2, polyethylene glycol 400 and p-toluenesulfonyl chloride are mixed and react to prepare an intermediate 1, pyridine is added to be used as an acid-binding agent, and the reaction process is as follows:

step S3, placing the intermediate 1 in a reaction kettle, adding ammonia water, heating to 140-145 ℃, carrying out a closed reaction for 6h, cooling to room temperature, extracting the aqueous phase three times by using dichloromethane, combining the organic phases, adding a sodium hydroxide aqueous solution with the mass fraction of 10%, stirring at a constant speed for 4h, washing to be neutral, and carrying out vacuum drying to obtain an intermediate 2, wherein the mass ratio of the intermediate 1 to the ammonia water with the mass fraction of 25% is controlled to be 0.1: 10;

in step S3, the intermediate 1 reacts with ammonia water to generate an intermediate 2, and the aqueous solution of sodium hydroxide is used as an acid-binding agent, and the reaction process is as follows:

step S4, adding the intermediate 2 into a four-neck flask, introducing nitrogen to discharge air, adding tetrabutyl ammonium bromide, heating to 45-50 ℃, magnetically stirring, slowly dropwise adding diethyl maleate, heating to 75 ℃ after dropwise adding, preserving heat, reacting for 12 hours, washing with water, separating liquid to obtain a compound b, controlling the molar ratio of the intermediate 2 to the diethyl maleate to be 1: 2, and controlling the using amount of the tetrabutyl ammonium bromide to be 1-3.5% of the weight of the intermediate 2;

in step S4, reacting intermediate 2 with diethyl maleate to generate compound b, wherein the reaction process is as follows:

and step S5, uniformly mixing the compound a and the compound b according to the molar ratio of 1: 1, stirring at a high speed for 5min, coating on the surface of a PET base layer, and curing at 100 ℃ to form a film, thereby preparing the transition coating.

The compound a and the compound b are cured to form a film, a cured coating is formed, the transitional coating is a bi-component, the compound a is used as a substrate, the compound b is used as a curing agent, the compound b is a secondary amine type curing agent in structure, the blocked maleate group is a spatial crown structure and has a spatial resistance effect on a connected amino group, the middle chain segment is a polyether structure, and the compound b and the compound a form a polyurea compound.

Further: the aluminum-plated layer is an aluminum film layer with the thickness of 0.05-0.08 mu m formed on the surface of the transition coating by adopting a vacuum aluminum-plating method.

A preparation method of an extremely fine metallic yarn film comprises the following steps:

firstly, preparing a PET base layer: putting the PET master batch into a double-screw extruder for extrusion granulation to obtain granules, melting, forming an amorphous thick sheet on a rotating cooling roller, preheating the cooled thick sheet, stretching at a stretching speed of 310m/min, performing heat setting on the stretched film, and cooling to obtain a PET base layer;

secondly, thermally curing the surface of the PET base layer to prepare a transition coating;

and thirdly, vacuum aluminizing is carried out on the surface of the transition coating to form an aluminized layer with the thickness of 0.05-0.08 mu m.

Further: the stretching in the first step comprises longitudinal stretching and transverse stretching, the stretching ratio is 1.65 multiplied by 2.46, the longitudinal stretching is 2.0 to 4.4 times, the transverse stretching is 2.5 to 4.5 times, and the transverse stretching temperature is 105-120 ℃.

The invention has the beneficial effects that:

the invention relates to a superfine metallic yarn film, which comprises a PET base layer, a transition coating and an aluminum plating layer, wherein the thin yarn can not be cut out by controlling the thickness of the aluminum plating layer to be 0.05-0.08 mu m, the excessive thickness of the plating layer is prevented, the transition coating is prepared by curing a compound a and a compound b into a film to form the transition coating, the transition coating is a bi-component, the compound a is used as a base body, the compound b is used as a curing agent, the compound b is structurally a secondary amine type curing agent, the blocked maleate group is a spatial crown structure, a spatial barrier effect is provided for a connected amino group, the middle chain segment is a polyether structure, and forms a polyurea compound with the compound a, after the transition coating is coated on the PET base layer, the adhesion between the prepared transition coating and the aluminum plating layer can be remarkably improved, the phenomena of aluminum layer falling off and the like during the preparation of superfine metallic yarns can be prevented, and no benzene ring structures are generated in the compound a and the compound b, so that the yellowing phenomenon can not occur during curing, and the appearance and the performance are not influenced.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The coating is prepared by the following steps:

step S1, adding hexamethylene diisocyanate into a three-neck flask under the nitrogen atmosphere, heating to 65 ℃ after magnetically stirring for 10min, slowly adding a catalyst solution dropwise, heating to 75 ℃, keeping the temperature, stirring at a constant speed and reacting, measuring the isocyanate content of the system by using a di-n-butylamine method every 1h, adding benzoyl chloride when the isocyanate content is reduced to 30%, continuing stirring for 30min, and stopping the reaction to obtain a compound a, wherein the dosage of the catalyst solution is 0.5% of the weight of the hexamethylene diisocyanate, and the dosage of the benzoyl chloride is 1% of the weight of the hexamethylene diisocyanate;

the catalyst solution is prepared by mixing quaternary ammonium base Z-0710 and butyl acetate according to the weight ratio of 1: 10.

Step S2, adding polyethylene glycol 400 into dichloromethane, stirring at a constant speed until the polyethylene glycol 400 is dissolved, then sequentially adding p-toluenesulfonyl chloride and pyridine, stirring at a constant speed and reacting for 24 hours, washing three times with dilute hydrochloric acid with the mass fraction of 10%, combining organic layers to obtain a crude product, adding the crude product into tetrahydrofuran, adding excessive diethyl ether, freezing at 0 ℃ for 10 hours, precipitating, filtering, decompressing and drying to obtain an intermediate 1, controlling the molar ratio of the polyethylene glycol 400 to the p-toluenesulfonyl chloride to be 1: 2, controlling the weight ratio of the polyethylene glycol 400 to the dichloromethane to be 1: 5, and using the pyridine in an amount of 30% of the weight of the polyethylene glycol 400;

step S3, placing the intermediate 1 in a reaction kettle, adding ammonia water, heating to 140 ℃, carrying out closed reaction for 6h, cooling to room temperature, extracting the water phase three times by using dichloromethane, combining organic phases, adding a sodium hydroxide aqueous solution with the mass fraction of 10%, stirring at a constant speed for 4h, washing to be neutral, carrying out vacuum drying to obtain an intermediate 2, and controlling the mass ratio of the intermediate 1 to the ammonia water with the mass fraction of 25% to be 0.1: 10;

step S4, adding the intermediate 2 into a four-neck flask, introducing nitrogen to discharge air, adding tetrabutyl ammonium bromide, heating to 45 ℃, magnetically stirring, slowly dropwise adding diethyl maleate, heating to 75 ℃ after dropwise adding, preserving heat, reacting for 12 hours, washing with water, separating liquid to obtain a compound b, controlling the molar ratio of the intermediate 2 to the diethyl maleate to be 1: 2, and controlling the using amount of the tetrabutyl ammonium bromide to be 1% of the weight of the intermediate 2;

and step S5, uniformly mixing the compound a and the compound b according to the molar ratio of 1: 1, stirring at a high speed for 5min, coating on the surface of a PET base layer, and curing at 100 ℃ to form a film, thereby preparing the transition coating.

Example 2

The coating is prepared by the following steps:

step S1, adding hexamethylene diisocyanate into a three-neck flask under the nitrogen atmosphere, heating to 65 ℃ after magnetically stirring for 10min, slowly adding a catalyst solution dropwise, heating to 85 ℃, keeping the temperature, stirring at a constant speed and reacting, measuring the isocyanate content of the system by using a di-n-butylamine method every 1h, adding benzoyl chloride when the isocyanate content is reduced to 32%, continuing stirring for 30min, and stopping the reaction to obtain a compound a, wherein the dosage of the catalyst solution is 0.7% of the weight of the hexamethylene diisocyanate, and the dosage of the benzoyl chloride is 1% of the weight of the hexamethylene diisocyanate;

the catalyst solution is prepared by mixing quaternary ammonium base Z-0710 and butyl acetate according to the weight ratio of 1: 10.

Step S2, adding polyethylene glycol 400 into dichloromethane, stirring at a constant speed until the polyethylene glycol 400 is dissolved, then sequentially adding p-toluenesulfonyl chloride and pyridine, stirring at a constant speed and reacting for 24 hours, washing three times with dilute hydrochloric acid with the mass fraction of 10%, combining organic layers to obtain a crude product, adding the crude product into tetrahydrofuran, adding excessive diethyl ether, freezing at 0 ℃ for 10 hours, precipitating, filtering, decompressing and drying to obtain an intermediate 1, controlling the molar ratio of the polyethylene glycol 400 to the p-toluenesulfonyl chloride to be 1: 2, controlling the weight ratio of the polyethylene glycol 400 to the dichloromethane to be 1: 5, and using the pyridine in an amount of 40% of the weight of the polyethylene glycol 400;

step S3, placing the intermediate 1 in a reaction kettle, adding ammonia water, heating to 145 ℃, carrying out closed reaction for 6h, cooling to room temperature, extracting the water phase three times by using dichloromethane, combining organic phases, adding a sodium hydroxide aqueous solution with the mass fraction of 10%, stirring at a constant speed for 4h, washing to be neutral, carrying out vacuum drying to obtain an intermediate 2, and controlling the mass ratio of the intermediate 1 to the ammonia water with the mass fraction of 25% to be 0.1: 10;

step S4, adding the intermediate 2 into a four-neck flask, introducing nitrogen to discharge air, adding tetrabutyl ammonium bromide, heating to 50 ℃, magnetically stirring, slowly dropwise adding diethyl maleate, heating to 75 ℃ after dropwise adding, preserving heat, reacting for 12 hours, washing with water, separating liquid to obtain a compound b, controlling the molar ratio of the intermediate 2 to the diethyl maleate to be 1: 2, and controlling the using amount of the tetrabutyl ammonium bromide to be 3% of the weight of the intermediate 2;

and step S5, uniformly mixing the compound a and the compound b according to the molar ratio of 1: 1, stirring at a high speed for 5min, coating on the surface of a PET base layer, and curing at 100 ℃ to form a film, thereby preparing the transition coating.

Example 3

The coating is prepared by the following steps:

step S1, adding hexamethylene diisocyanate into a three-neck flask under the nitrogen atmosphere, heating to 65 ℃ after magnetically stirring for 10min, slowly adding a catalyst solution dropwise, heating to 100 ℃, keeping the temperature, stirring at a constant speed and reacting, measuring the isocyanate content of the system by using a di-n-butylamine method every 1h, adding benzoyl chloride when the isocyanate content is reduced to 35%, continuing stirring for 30min, and stopping the reaction to obtain a compound a, wherein the dosage of the catalyst solution is 0.8% of the weight of the hexamethylene diisocyanate, and the dosage of the benzoyl chloride is 1% of the weight of the hexamethylene diisocyanate;

the catalyst solution is prepared by mixing quaternary ammonium base Z-0710 and butyl acetate according to the weight ratio of 1: 10.

Step S2, adding polyethylene glycol 400 into dichloromethane, stirring at a constant speed until the polyethylene glycol 400 is dissolved, then sequentially adding p-toluenesulfonyl chloride and pyridine, stirring at a constant speed and reacting for 24 hours, washing three times with dilute hydrochloric acid with the mass fraction of 10%, combining organic layers to obtain a crude product, adding the crude product into tetrahydrofuran, adding excessive diethyl ether, freezing at 0 ℃ for 10 hours, precipitating, filtering, decompressing and drying to obtain an intermediate 1, controlling the molar ratio of the polyethylene glycol 400 to the p-toluenesulfonyl chloride to be 1: 2, controlling the weight ratio of the polyethylene glycol 400 to the dichloromethane to be 1: 5, and using 50% of the pyridine based on the weight of the polyethylene glycol 400;

step S3, placing the intermediate 1 in a reaction kettle, adding ammonia water, heating to 145 ℃, carrying out closed reaction for 6h, cooling to room temperature, extracting the water phase three times by using dichloromethane, combining organic phases, adding a sodium hydroxide aqueous solution with the mass fraction of 10%, stirring at a constant speed for 4h, washing to be neutral, carrying out vacuum drying to obtain an intermediate 2, and controlling the mass ratio of the intermediate 1 to the ammonia water with the mass fraction of 25% to be 0.1: 10;

step S4, adding the intermediate 2 into a four-neck flask, introducing nitrogen to discharge air, adding tetrabutyl ammonium bromide, heating to 50 ℃, magnetically stirring, slowly dropwise adding diethyl maleate, heating to 75 ℃ after dropwise adding, preserving heat, reacting for 12 hours, washing with water, separating liquid to obtain a compound b, controlling the molar ratio of the intermediate 2 to the diethyl maleate to be 1: 2, and controlling the using amount of the tetrabutyl ammonium bromide to be 3.5% of the weight of the intermediate 2;

and step S5, uniformly mixing the compound a and the compound b according to the molar ratio of 1: 1, stirring at a high speed for 5min, coating on the surface of a PET base layer, and curing at 100 ℃ to form a film, thereby preparing the transition coating.

Example 4

A preparation method of an extremely fine metallic yarn film comprises the following steps:

firstly, preparing a PET base layer: putting the PET master batch into a double-screw extruder for extrusion granulation to obtain granules, melting, forming an amorphous thick sheet on a rotating cooling roller, preheating the cooled thick sheet, stretching at a stretching speed of 310m/min, performing heat setting on the stretched film, and cooling to obtain a PET base layer;

the stretching includes longitudinal stretching and transverse stretching, the stretching ratio is 1.65 multiplied by 2.46, the longitudinal stretching is 2.0 times, the transverse stretching is 2.5 times, and the transverse stretching temperature is 105 ℃.

Secondly, thermally curing the surface of the PET base layer to prepare a transition coating;

and thirdly, vacuum aluminizing is carried out on the surface of the transition coating to form an aluminized layer with the thickness of 0.05 mu m.

Example 5

A preparation method of an extremely fine metallic yarn film comprises the following steps:

firstly, preparing a PET base layer: putting the PET master batch into a double-screw extruder for extrusion granulation to obtain granules, melting, forming an amorphous thick sheet on a rotating cooling roller, preheating the cooled thick sheet, stretching at a stretching speed of 310m/min, performing heat setting on the stretched film, and cooling to obtain a PET base layer;

the stretching includes longitudinal stretching and transverse stretching, the stretching ratio is 1.65 multiplied by 2.46, the longitudinal stretching is 3.5 times, the transverse stretching is 3.2 times, and the transverse stretching temperature is 110 ℃.

Secondly, thermally curing the surface of the PET base layer to prepare a transition coating;

and thirdly, vacuum aluminizing is carried out on the surface of the transition coating to form an aluminized layer with the thickness of 0.06 mu m.

Example 6

A preparation method of an extremely fine metallic yarn film comprises the following steps:

firstly, preparing a PET base layer: putting the PET master batch into a double-screw extruder for extrusion granulation to obtain granules, melting, forming an amorphous thick sheet on a rotating cooling roller, preheating the cooled thick sheet, stretching at a stretching speed of 310m/min, performing heat setting on the stretched film, and cooling to obtain a PET base layer;

the stretching comprises longitudinal stretching and transverse stretching, the stretching ratio is 1.65 multiplied by 2.46, the longitudinal stretching is 4.4 times, the transverse stretching is 4.5 times, and the transverse stretching temperature is 120 ℃.

Secondly, thermally curing the surface of the PET base layer to prepare a transition coating;

and thirdly, vacuum aluminizing is carried out on the surface of the transition coating to form an aluminized layer with the thickness of 0.08 mu m.

Comparative example 1

Compared with the example 4, the comparative example has no transition coating and directly carries out vacuum aluminizing on the surface of the PET base layer.

Comparative example 2

This comparative example is a polyester aluminized film produced by a commercially available company.

The mechanical properties and aluminum layer adhesion properties of the films prepared in examples 4 to 6 and comparative examples 1 to 2 were measured, and the results are shown in the following table:

testing the tensile strength and the elongation at break according to GB/T1040;

adhesion performance: the peeling strength of the transition coating and the aluminum coating is detected by adopting a test method of 180-degree peeling strength of the GB2790-85 adhesive.

From the table, it can be seen that the film prepared by the invention has excellent mechanical properties, and has higher adhesive force with an aluminum coating, and the phenomena of aluminum coating falling off and the like during the preparation of ultrafine gold and silver wires are effectively prevented.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.