阅读说明：本技术 一种高透光汽车贴膜的制备方法 (Preparation method of high-light-transmittance automobile film ) 是由 夏莲子 于 2020-07-23 设计创作，主要内容包括：本发明提供的一种高透光汽车贴膜的制备方法,包括步骤：S100将硅烷交联聚乙烯压制成厚度为0.2～0.4mm的薄膜；S200将分散涂覆剂稀释10倍；S300将稀释后的分散剂均匀涂于硅烷交联聚乙烯薄膜上,晾干后制得高透光汽车贴膜。从而通过改进的硅烷交联聚乙烯分散膜及其合成工艺,有效提高汽车贴膜的透光度并可有效降低贴膜的雾度。(The invention provides a preparation method of a high-light-transmittance automobile film, which comprises the following steps: s100, pressing silane crosslinked polyethylene into a film with the thickness of 0.2-0.4 mm; s200, diluting the dispersion coating agent by 10 times; s300, uniformly coating the diluted dispersing agent on a silane cross-linked polyethylene film, and airing to obtain the high-light-transmittance automobile film. Therefore, the transmittance of the automobile film can be effectively improved and the haze of the film can be effectively reduced through the improved silane crosslinked polyethylene dispersion film and the synthesis process thereof.)

1. A preparation method of a high-light-transmission automobile film is characterized by comprising the following steps:

s100, pressing silane crosslinked polyethylene into a film with the thickness of 0.2-0.4 mm;

s200, diluting the dispersion coating agent by 10 times;

s300, uniformly coating the diluted dispersing agent on a silane cross-linked polyethylene film, and airing to obtain the high-light-transmittance automobile film.

2. The method for preparing silane-crosslinked polyethylene according to claim 1, wherein the method for preparing silane-crosslinked polyethylene in step S100 comprises the steps of:

s110, putting 200 parts of LDPE (Low-Density polyethylene) particles into a beaker, putting the beaker into an oven, and removing trace water in the beaker under the drying condition of 65 ℃ for 4 hours;

s120, uniformly mixing 100 parts of dried LDPE (Low-Density polyethylene) particles, 2.5 parts of silane and 2-3 parts of initiator tert-butyl peroxypivalate in a three-necked bottle, and marking as a material A;

s130, performing rheology on 100 parts of dried LDPE (Low-Density polyethylene) particles and 0.1-0.3 part of water-producing agent in a rheometer to obtain water-producing agent master batch tabletting, and shearing to obtain water-producing agent master batch which is marked as material B;

s140, adding the equal amount of the material A and the material B into a torque rheometer to react;

s150, pressing the product obtained from the rheometer into a thin film with the thickness of 0.3mm by using a flat vulcanizing machine to obtain the silane self-crosslinking polyethylene coating dispersion film.

3. The preparation method according to claim 2, wherein the water generating agent is ZnO or SnO.

4. The method for preparing a dispersion coating agent according to claim 3, wherein the method for preparing a dispersion coating agent in the step S200 comprises the steps of:

s210 is prepared from A, B, C, D four components in a weight ratio of 3: 2: 1: 1 proportion, wherein the component A is formed by mixing silica gel, distilled water, ethanol and a silane coupling agent, the component B is alkyl aliphatic amine which is a condensation accelerator, the component C is self-made aluminum sol, and the component D is sodium dodecyl sulfate;

s220, slowly dripping the component A into the component C, and continuously stirring to uniformly mix the component A and the component C to prepare a mixed solution;

s230, adding the component B into distilled water, heating until the component B is dissolved in the water, and then carrying out ultrasonic vibration for 30 min;

s240, adding the prepared component B solution into the prepared mixed solution;

s250, adding the component D into water for dissolving, adding into the mixed solution in the S240, and fully mixing to obtain the dispersion coating agent.

5. The method according to claim 4, wherein component A is prepared from silica gel, distilled water, ethanol, a silane coupling agent in a weight ratio of 10: 5: 3: 3, mixing the components in proportion.

6. The method of claim 5, wherein the method of preparing component A comprises the steps of: weighing 100g of silica sol and 30g of vinyltriethoxysilane, pouring the silica sol and 30g of vinyltriethoxysilane into a three-neck flask provided with a stirring device, slowly stirring for 5min, then adding 38mL of ethanol and 50mL of distilled water, continuously and uniformly stirring for reacting for 30min, then adding a proper amount of silica sol, and continuously stirring to completely react; pouring silica sol and vinyl triethoxysilane into a three-neck flask with a stirring device, slowly stirring for 5min, adding ethanol and water, continuously and slowly stirring for uniform reaction for 30min, adding appropriate amount of silica sol, and continuously stirring for complete reaction.

Technical Field

The invention relates to the technical field of automobile accessories, in particular to a preparation method of a high-light-transmittance automobile film.

Background

The automobile film is formed by adhering a film-shaped object on front and rear windshields, side window glass and a skylight of a vehicle. At present, nano-scale metal layers with high reflectivity to infrared rays, such as metal aluminum, silver, nickel, indium and the like, are generally used as high-light-transmitting layers and special UV absorbers to absorb ultraviolet rays. However, metals are expensive and some belong to heavy metals, which have great influence on human body and environment. In addition, fog on the front window of the automobile is a problem for the driver in winter. Due to the fog, drivers often adopt a window opening or cold air opening mode to quickly remove the fog, so that the comfort of passengers is reduced; meanwhile, fog can cause poor visual field and potential safety hazard. At present, the effective components of a film layer used for high light transmission and ultraviolet isolation in an automobile film are toxic, harmful and expensive metal elements.

Common high transmittance technologies can be divided into active high transmittance and passive high transmittance. The active high light transmittance is mainly realized by forcibly removing surface fog drops through mechanical wiping or electrical heating, the technology is mature, but the defects of narrow application range, poor safety and the like exist. Passive high light transmission usually means that a hydrophobic coating or a hydrophilic coating is made on the surface of a material to achieve the goal of high light transmission, i.e. under the action of gravity and wind, large water droplets such as rainwater cannot be attached to the surface of the hydrophobic coating, and a waterproof effect can be achieved, but for micron-sized small fog droplets, the high light transmission effect is limited. For hydrophilic surfaces, water drops can spread on the surface of the material, and if the water drops can be completely spread to form a transparent water film, the high light transmission effect is good.

Polyethylene can be significant.

Disclosure of Invention

The invention mainly aims to provide a preparation method of a high-light-transmission automobile film, which overcomes the defects of the prior art, effectively improves the light transmittance of the automobile film and can effectively reduce the haze of the film through an improved silane crosslinked polyethylene dispersion film and a synthesis process thereof.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a preparation method of a high-light-transmittance automobile film comprises the following steps:

s100, pressing silane crosslinked polyethylene into a film with the thickness of 0.2-0.4 mm;

s200, diluting the dispersion coating agent by 10 times;

s300, uniformly coating the diluted dispersing agent on a silane cross-linked polyethylene film, and airing to obtain the high-light-transmittance automobile film.

According to an embodiment of the present invention, the method for preparing the silane crosslinked polyethylene in the step S100 includes the steps of:

s110, putting 200 parts of LDPE (Low-Density polyethylene) particles into a beaker, putting the beaker into an oven, and removing trace water in the beaker under the drying condition of 65 ℃ for 4 hours;

s120, uniformly mixing 100 parts of dried LDPE (Low-Density polyethylene) particles, 2.5 parts of silane and 2-3 parts of initiator tert-butyl peroxypivalate in a three-necked bottle, and marking as a material A;

s130, performing rheology on 100 parts of dried LDPE (Low-Density polyethylene) particles and 0.1-0.3 part of water-producing agent in a rheometer to obtain water-producing agent master batch tabletting, and shearing to obtain water-producing agent master batch which is marked as material B;

s140, adding the equal amount of the material A and the material B into a torque rheometer to react;

s150, pressing the product obtained from the rheometer into a thin film with the thickness of 0.3mm by using a flat vulcanizing machine to obtain the silane self-crosslinking polyethylene coating dispersion film.

According to an embodiment of the present invention, the water generating agent is ZnO or SnO.

According to an embodiment of the present invention, the method for preparing the dispersion coating agent in the step S200 includes the steps of:

s210 is prepared from A, B, C, D four components in a weight ratio of 3: 2: 1: 1 proportion, wherein the component A is formed by mixing silica gel, distilled water, ethanol and a silane coupling agent, the component B is alkyl aliphatic amine which is a condensation accelerator, the component C is self-made aluminum sol, and the component D is sodium dodecyl sulfate;

s220, slowly dripping the component A into the component C, and continuously stirring to uniformly mix the component A and the component C to prepare a mixed solution;

s230, adding the component B into distilled water, heating until the component B is dissolved in the water, and then carrying out ultrasonic vibration for 30 min;

s240, adding the prepared component B solution into the prepared mixed solution;

s250, adding the component D into water for dissolving, adding into the mixed solution in the S240, and fully mixing to obtain the dispersion coating agent.

According to one embodiment of the invention, the component A is prepared from silica gel, distilled water, ethanol and a silane coupling agent according to a weight ratio of 10: 5: 3: 3, mixing the components in proportion.

According to one embodiment of the invention, the preparation method of the component A comprises the following steps: weighing 100g of silica sol and 30g of vinyltriethoxysilane, pouring the silica sol and 30g of vinyltriethoxysilane into a three-neck flask provided with a stirring device, slowly stirring for 5min, then adding 38mL of ethanol and 50mL of distilled water, continuously and uniformly stirring for reacting for 30min, then adding a proper amount of silica sol, and continuously stirring to completely react; pouring silica sol and vinyl triethoxysilane into a three-neck flask with a stirring device, slowly stirring for 5min, adding ethanol and water, continuously and slowly stirring for uniform reaction for 30min, adding appropriate amount of silica sol, and continuously stirring for complete reaction.

Compared with the prior art, the invention has the beneficial effects that:

(1) the silane crosslinked polyethylene dispersion film reduces the interfacial tension between water and the glass surface, so that water drops and water mist are completely spread on the glass surface to form a thin water film, light scattering cannot be caused, and the sight line is not influenced.

(2) The light transmittance of the silane crosslinked modified polyethylene dispersion film is increased mainly because the common polyethylene dispersion film is of an additive type, the compatibility between the polyethylene film and a dispersing agent is poor, the small molecular dispersing agent is easy to separate out from the inside due to the mobility of the small molecular dispersing agent, and the light transmittance of the film is reduced, so that the light transmittance of the silane crosslinked polyethylene dispersion film is high.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

Preparation of silane self-crosslinking polyethylene:

(1) putting 200 parts of LDPE (Low-Density polyethylene) particles into a 500ml beaker, putting the beaker into an oven, and removing trace water in the beaker under the drying condition of 65 ℃ for 4 hours;

(2) uniformly mixing 100 parts of dried LDPE (Low-Density polyethylene) particles, 2.5 parts of silane and 2.5 parts of initiator tert-butyl Peroxypivalate (PV) in a three-necked bottle, and marking as a material A;

(3) fluidizing 100 parts of dried LDPE particles and ZnO or SnO in a rheometer, tabletting obtained ZnO or SnO master batch, and shearing to obtain a water producing agent ZnO or SnO master batch which is marked as material B;

(4) adding the equal amount of the material A and the material B into a torque rheometer to react;

(5) the product obtained in the rheometer was pressed into a film having a thickness of about 0.3mm by a press vulcanizer to obtain a dispersion film coated with silane self-crosslinked polyethylene.

Table 1 is a table of the components of silane self-crosslinking polyethylene in which the water-generating agent is SnO.

Table 2 is a table of the components of silane self-crosslinking polyethylene in which the water-generating agent is ZnO.

Preparation of dispersion coating agent:

(1) the dispersion coating agent is prepared from A, B, C, D four components in a weight ratio of 3: 2: 1: 1, preparing the mixture according to a proportion; the component A is prepared from silica gel, distilled water, ethanol and a silane coupling agent according to the weight ratio of 10: 5: 3: 3, the component B is alkyl aliphatic amine as a condensation accelerator, the component C is self-made aluminum sol, and the component D is sodium dodecyl sulfate;

(2) preparing a component A, weighing 100g of silica sol and 30g of vinyl triethoxysilane, pouring the silica sol and 30g of vinyl triethoxysilane into a 250mL three-neck flask provided with a stirring device, slowly stirring for 5min, then adding 38mL of ethanol and 50mL of distilled water, continuously and slowly stirring for uniform reaction for 30min, then adding a proper amount of silica sol, and continuously stirring to ensure that the reaction is complete;

(3) slowly dripping the component A into the component C, and continuously stirring by using a glass rod to uniformly mix the component A and the component C;

(4) adding distilled water into the component B, heating the component B on a heating sleeve until the component B is dissolved in the water, and then carrying out ultrasonic vibration for 30 min;

(5) adding the prepared component B solution into the mixed solution which is just prepared;

(6) and (3) adding the component D into water for dissolving, and adding into the prepared mixed solution, and fully mixing to obtain the dispersion coating agent.

A preparation method of a high-light-transmittance automobile film comprises the following steps:

(1) pressing the prepared silane cross-linked polyethylene material into a film with the thickness of about 0.3 mm;

(2) diluting the prepared dispersion coating agent by 10 times;

(3) and dipping the diluted dispersing agent by using a cotton swab, slightly coating the dispersing agent on a silane cross-linked polyethylene film, and naturally drying to obtain the high-light-transmittance automobile film.

The surface tension test, taking the film with the water-generating agent SnO as an example, shows the results in Table 3.

TABLE 3 results of surface tension test of examples 1 to 5

When the reaction temperature is increased, the surface tension of the silane crosslinked polyethylene film is increased; when the amount of the initiator is increased, the surface tension of the silane crosslinked polyethylene film is increased.

And (3) testing light transmittance and haze, wherein the light transmittance-haze test is carried out by adopting a WGT-S light transmittance-haze tester, the size of a film sample is 50mm multiplied by 50mm, the surface of a test sample is smooth and has no obvious defect, each sample is tested for 5 times, and the average value is an experimental result.

The results of film formation in example 5 are shown in Table 4, taking as an example a film in which the water-generating agent is SnO.

Table 4 test of transmittance and haze of film of example 5 in which water-generating agent is SnO

As can be seen from the table, the light transmittance of the common polyethylene dispersion film is 90% at the lowest, and the light transmittance of the silane-crosslinked modified polyethylene dispersion film is increased, because the common polyethylene dispersion film is an additive type, the compatibility between the polyethylene film and the dispersant is poor, and the small-molecular dispersant is easy to precipitate from the inside due to the mobility of the small-molecular dispersant, so that the light transmittance of the film is reduced; therefore, the silane crosslinked polyethylene dispersion film has high light transmittance.

Therefore, the invention adopts a novel synthesis process, can effectively improve the transmittance of the automobile film and can effectively reduce the haze of the film.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.