阅读说明：本技术 一种感光变色车用热转印膜及其制备方法 (Heat transfer film for photochromic vehicle and preparation method thereof ) 是由 王坤 张水 王珂珂 岳修锋 陈谊乐 王睿 于 2020-08-21 设计创作，主要内容包括：本发明涉及一种感光变色车用热转印膜,包括带基和涂布在带基表面可感光变色的热转印色层,所述热转印色层由下述重量份数的各原料制成：连结料70-80份,感光变色粉20-30份。本发明所提供的感光变色车用热转印膜,经过热转印后承印在车窗玻璃上,在无光照的情况下为透明,在光照下产生变色阻隔紫外线的功能,且随着光照强度的增加,颜色也会加深；具备良好的耐水性、耐刮擦、廉价、耐候性、使用寿命长等优点。(The invention relates to a heat transfer film for a photochromic vehicle, which comprises a belt base and a photochromic heat transfer color layer coated on the surface of the belt base, wherein the heat transfer color layer is prepared from the following raw materials in parts by weight: 70-80 parts of binder and 20-30 parts of photochromic powder. The heat transfer film for the photosensitive color-changing vehicle is printed on vehicle window glass after heat transfer, is transparent under the condition of no illumination, has the functions of changing color and blocking ultraviolet rays under illumination, and can deepen the color along with the increase of illumination intensity; has the advantages of good water resistance, scratch resistance, low price, weather resistance, long service life and the like.)

1. The heat transfer film for the photochromic vehicle is characterized by comprising a base and a heat transfer color layer coated on the surface of the base and capable of changing color by sensitization, wherein the heat transfer color layer is prepared from the following raw materials in parts by weight: 70-80 parts of binder and 20-30 parts of photochromic powder.

2. The heat transfer film according to claim 1, wherein the binder is a silicone-modified acrylic resin.

3. The thermal transfer film for a photochromic vehicle according to claim 1, wherein the photochromic powder is a spiropyran-based photochromic material.

4. The photochromic vehicular heat transfer film according to claim 1, wherein the tape base is a PET polyester film having a thickness of 10 to 14 μm.

5. The method for preparing the heat transfer film for the photochromic vehicle according to any one of claims 1 to 4, comprising the steps of:

1) weighing the connecting material and methylcyclopentane at a weight ratio of 1-5: 3-7, mixing, heating to 60-70 deg.C, stirring to completely clarify, cooling, adding corresponding proportion of photosensitive color-changing powder, dispersing, grinding to obtain powder D50 no more than 1.5 μm;

2) uniformly coating the material obtained by grinding in the step 1) on the surface of one side of the belt base, and drying to obtain the belt base.

6. The method for preparing the heat transfer film for the photochromic vehicle according to claim 5, wherein a pin-type sand mill is selected during grinding in the step 1).

7. The method for preparing the heat transfer film for the photochromic vehicle according to claim 5, wherein the coating thickness in the step 2) is 5 to 6 micrometers, and the drying temperature is 100 ℃ to 120 ℃.

Technical Field

The invention belongs to the technical field of thermoprinting materials, and particularly relates to a heat transfer film for a photochromic vehicle and a preparation method thereof.

Background

At present, most of automobile films in the market take a PET film as a carrier, a layer of acrylic resin is brushed on the film, infrared rays are absorbed through nano ceramic particles contained in the film to achieve the purposes of heat insulation and the like, but the absorption of ultraviolet rays is relatively weak, the film can age under the irradiation of sunlight, yellowing is caused after long time, wrinkles obstruct vision, and driving safety is influenced.

The heat transfer film for the photosensitive color-changing vehicle is printed on glass after being hot-pressed by a heat transfer principle, is colorless and transparent under the condition of no sunlight irradiation, develops color by ring-opening conjugation reaction of photosensitive color-changing pigment after absorbing ultraviolet rays, and decolors under the condition of no light irradiation, has the characteristics of high light transmittance, low ultraviolet ray penetration rate and the like, avoids the problems of aging, yellowing, influence on sight and the like caused by long-time sunlight irradiation compared with other common vehicle films, and has the advantages of low price, long service life, strong resistance and the like.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the heat transfer film for the photosensitive color-changing vehicle, which solves the problems of aging, yellowing, influence on sight and the like caused by long-time sunlight irradiation and has the advantages of low price, long service life, strong resistance and the like.

The invention also provides a preparation method of the heat transfer film for the photochromic vehicle.

In order to achieve the purpose, the invention adopts the following technical scheme:

the heat transfer film for the photosensitive color-changing vehicle comprises a tape base and a heat transfer color layer which is coated on one side surface of the tape base and can be subjected to photosensitive color-changing, wherein the total amount of the heat transfer color layer is 100 parts and is prepared from the following raw materials in parts by weight: 70-80 parts of binder and 20-30 parts of photochromic powder.

More preferably, the bonding material is organic silicon modified acrylic resin. The function of the coating is that the coating obtained by the organosilicon modified acrylic resin has very good weather resistance, water resistance, transparency and the like.

More preferably, the photosensitive variable toner is a spiropyran-based photochromic material, also called spiropyran photosensitive variable toner. The photosensitive color-changing powder can generate ring-opening conjugation reaction to develop color after absorbing ultraviolet rays, and can effectively absorb partial ultraviolet energy to achieve the effect of blocking the ultraviolet rays. Other color-changing powder has unstable halogen and toxicity due to different color-changing principles, short color-changing service life and complex process preparation, and is not suitable for the products.

More preferably, the base tape is a PET polyester film with the thickness of 10-14 microns.

The invention provides a preparation method of the heat transfer film for the photochromic vehicle, which comprises the following steps:

1) weighing the connecting material and methylcyclopentane at a weight ratio of 1-5: 3-7, mixing, heating to 60-70 deg.C, stirring to completely clarify, cooling, adding photosensitive color-changing powder, dispersing, grinding to D50 no more than 1.5 μm;

2) uniformly coating the material obtained by grinding in the step 1) on the surface of one side of the belt base, and drying to obtain the belt base.

Specifically, a pin rod type sand mill can be used for grinding in the step 1).

Specifically, the coating thickness in the step 2) can be 5-6 microns, and the drying temperature can be 100-120 ℃.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1) the heat transfer film for the photosensitive color-changing vehicle, provided by the invention, has the advantages that the heat transfer film absorbs ultraviolet rays to change color under the irradiation of sunlight so as to achieve the purpose of blocking the ultraviolet rays, and the stronger the ultraviolet rays are, the darker the color of the film is, and the film can quickly change back to be transparent under the condition of no illumination;

2) the heat transfer film product is transferred to toughened glass for vehicles, the transferred glass is irradiated under the sun, the glass can be completely and uniformly changed into dark gray within 2-3 minutes, the light transmittance is detected to be more than 75% after the glass is completely discolored, and the ultraviolet absorption rate is more than 95%;

3) the heat transfer film for the photosensitive color-changing vehicle is low in price, practical and long in service life, and solves the problem that the conventional vehicle film is easy to age and turn yellow.

Detailed Description

The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.

In the following examples, the selected raw materials are described as follows:

carrying out tape base: a PET polyester film with the thickness of 12 microns, and the manufacturer is Shandong Fuwei film Co.Ltd;

silicone-modified acrylic resin (thermoplastic resin): purchased from Shenzhen Jipeng silicon fluorine materials GmbH, model number JP-R0021, viscosity of 30mpa · s;

photosensitive variable toner: the spiropyran allochroic material, namely the gray SMC33# of the allochroic ink coating company in Dongguan is selected and changed from colorless to gray. D50 is 5 +/-2 microns and resists the high temperature of 220 ℃;

methylcyclopentane, performance requirements: the water content of the common chemical solvent is less than 0.5 percent, and no other requirements exist.