CN114349929A - Anti-yellowing high-transparency invisible car cover and preparation method thereof - Google Patents
Anti-yellowing high-transparency invisible car cover and preparation method thereof Download PDFInfo
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- CN114349929A CN114349929A CN202111675646.6A CN202111675646A CN114349929A CN 114349929 A CN114349929 A CN 114349929A CN 202111675646 A CN202111675646 A CN 202111675646A CN 114349929 A CN114349929 A CN 114349929A
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Abstract
The invention belongs to the technical field of invisible car covers, and particularly relates to a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by weight: 1500 portions of polycarbonate diol 1000-containing materials, 350 portions of isocyanate 250-containing materials, 70-100 portions of chain extender, 10-20 portions of flatting agent, 10-15 portions of catalyst and 3000 portions of solvent 2000-containing materials. The invention provides a yellowing-resistant high-transparency invisible car cover, which is prepared from different raw materials from the traditional modification means, does not mainly depend on an antioxidant stabilizer and an ultraviolet-resistant auxiliary agent to improve the yellowing resistance of a system, directly starts from the raw materials, selects polycarbonate diol with relatively low unsaturation degree and aliphatic isocyanate as the main raw materials, and has good yellowing resistance and oxidation resistance, and good transparency and stability. In addition, the invention also provides a preparation method of the yellowing-resistant high-transparency invisible car cover, which is simple and easy to operate and has high yield.
Description
Technical Field
The invention belongs to the technical field of invisible car covers, and particularly relates to a yellowing-resistant variable-transmittance invisible car cover and a preparation method thereof.
Background
The invisible automobile coat is also called as an automobile paint surface protective film, has the functions of protecting automobile paint from scratch, natural weathering and the like, and has the effects of quality and value preservation of the appearance of an automobile; for the invisible car clothes, yellowing resistance is an important performance for identifying the advantages and the disadvantages of the invisible car clothes. The yellowing phenomenon of the invisible car cover is mainly caused by the aging of the polyurethane coating at the top of the invisible car cover, and the yellowing of the car cover directly influences the appearance of the invisible car cover, so that the service life of the car cover is shortened.
The current means for improving the yellowing resistance of polyurethane coatings are as follows: 1. absorbing or shielding ultraviolet light by adding an ultraviolet resistant auxiliary agent; 2. nanoparticles such as silica are added to inhibit photocleavage and photooxidation. However, some anti-ultraviolet additives such as carbon black, zinc white or silica nanoparticles are added, and the like, because of low compatibility with a system and poor dispersibility, the transparency of the coating is reduced, and the application of the coating in a high-transparency scene is limited; and most of the polyurethane coatings prepared by the modification means of the anti-ultraviolet auxiliary agent at present have high yellowing index, and cannot meet the requirement of yellowing resistance of the invisible car clothes which needs to be used for a long time. For example: patent No. CN 110467785A, the patent name of which is an anti-yellowing and anti-ultraviolet car clothing film, discloses a car clothing capable of effectively resisting yellowing and ultraviolet, but the raw material of the car clothing contains titanium dioxide, which has poor compatibility and dispersibility with a car clothing system, and is easy to cause the transparency reduction of a coating.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a yellowing-resistant high-transparency invisible car cover, which is prepared from different raw materials from the traditional modification means, does not mainly depend on an antioxidant stabilizer and an ultraviolet-resistant auxiliary agent to improve the yellowing resistance of a system, and directly starts from the raw materials, and selects polycarbonate diol with relatively low unsaturation degree and aliphatic isocyanate as main raw materials; most of carbonyl groups in the soft segment of the polycarbonate polyurethane system participate in the formation of hydrogen bonds, so that the polyurethane coating has better mechanical property and oxidation resistance, and the polycarbonate diol with relatively low unsaturation degree is selected, so that yellowing caused by oxidation of excessive unsaturated bonds and internal cyclization of acrylonitrile chain links can be effectively prevented; and the aliphatic isocyanate reduces the number of unsaturated double bonds of a benzene ring, and reduces the yellowing tendency of the polymer caused by the influence of external factors due to the existence of the unsaturated double bonds. The invention also provides a preparation method of the yellowing-resistant high-transparency invisible car cover, which is simple and easy to operate and has high yield.
The technical effect to be achieved by the invention is realized by the following technical scheme:
the invention discloses a yellowing-resistant high-transparency invisible car cover, which comprises the following raw materials in parts by weight: 1500 portions of polycarbonate diol 1000-containing materials, 350 portions of isocyanate 250-containing materials, 70-100 portions of chain extender, 10-20 portions of flatting agent, 10-15 portions of catalyst and 3000 portions of solvent 2000-containing materials.
As a preferable scheme, the raw materials of the car cover comprise the following components in parts by weight: 1200 parts of polycarbonate diol 1000-.
In a preferred embodiment, the isocyanate is one or a mixture of two or more of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), 1, 5-Naphthalene Diisocyanate (NDI), Xylylene Diisocyanate (XDI), and Lysine Diisocyanate (LDI).
As a preferable scheme, the chain extender is one or a mixture of more of ethanolamine, diethanolamine, triethanolamine, triisopropanolamine and N, N-bis (2-hydroxypropyl) aniline.
As a preferable embodiment, the leveling agent is BYK333 leveling agent of BYK corporation.
In a preferred embodiment, the catalyst is an organometallic catalyst.
In one preferred embodiment, the solvent is ethyl acetate.
The preparation method of the yellowing-resistant high-transparency invisible car cover comprises the following steps:
s01, weighing polycarbonate diol, isocyanate, a chain extender and a solvent in the expected mass parts in a container, and stirring and dispersing for a period of time at room temperature;
s02, sequentially adding the leveling agent and the catalyst in the expected mass parts, and continuously stirring and dispersing for a period of time at room temperature to obtain the polyurethane coating;
and S03, coating the obtained polyurethane coating on a TPU transparent film through a coating machine, baking and curing to obtain the invisible car cover.
In one preferable embodiment, in step S01 and step S02, the rotation speed of stirring and dispersing is 450rpm-800rpm, and the time of stirring and dispersing is 15min-30 min.
As a preferable scheme, in the step S03, the baking temperature is 95-120 ℃, and the baking time is 3-8 min; the curing temperature is 80-100 ℃, and the curing time is 10-20 h.
In summary, the invention has at least the following advantages:
1. according to the yellowing-resistant high-transparency invisible car cover, polycarbonate diol with relatively low unsaturation degree and aliphatic isocyanate are selected as main raw materials, and most of carbonyl groups in a soft segment of a polycarbonate polyurethane system participate in the formation of hydrogen bonds, so that the polyurethane coating has better mechanical property and oxidation resistance.
2. According to the yellowing-resistant high-transparency invisible car cover, the polycarbonate diol with relatively low unsaturation degree is selected as the raw material, so that yellowing caused by oxidation of excessive unsaturated bonds and internal cyclization of acrylonitrile chain links can be effectively prevented; and the aliphatic isocyanate reduces the number of unsaturated double bonds of a benzene ring, and reduces the yellowing tendency of the polymer caused by the influence of external factors due to the existence of the unsaturated double bonds.
3. According to the yellowing-resistant high-transparency invisible car cover, the chain extender is added into the raw materials, so that the crosslinking density can be effectively improved, and a polyurethane coating system is more stable.
4. The preparation method of the yellowing-resistant high-transparency invisible car cover is simple and easy to operate and high in yield.
Detailed Description
In a first aspect, the invention provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by weight: 1500 portions of polycarbonate diol 1000-containing materials, 350 portions of isocyanate 250-containing materials, 70-100 portions of chain extender, 10-20 portions of flatting agent, 10-15 portions of catalyst and 3000 portions of solvent 2000-containing materials.
The raw materials of the invention are different from the traditional modification means, and the yellowing resistance of the system is not improved mainly by an antioxidant stabilizer and an anti-ultraviolet auxiliary agent, but the raw materials are directly used, and polycarbonate diol with relatively low unsaturation degree and aliphatic isocyanate are selected as the main raw materials; most of carbonyl groups in the soft segment of the polycarbonate polyurethane system participate in the formation of hydrogen bonds, so that the polyurethane coating has better mechanical property and oxidation resistance, and the polycarbonate diol with relatively low unsaturation degree is selected as the raw material, so that yellowing caused by oxidation of excessive unsaturated bonds and internal cyclization of acrylonitrile chain links can be effectively prevented; and the aliphatic isocyanate reduces the number of unsaturated double bonds of a benzene ring, and reduces the yellowing tendency of the polymer caused by the influence of external factors due to the existence of the unsaturated double bonds. In addition, the chain extender is added into the raw materials, so that the crosslinking density can be effectively improved, and a polyurethane coating system is more stable.
Further, the raw materials of the car cover comprise the following components in parts by weight: 1200 parts of polycarbonate diol 1000-.
The isocyanate is one or a mixture of more than two of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), 1, 5-Naphthalene Diisocyanate (NDI), Xylylene Diisocyanate (XDI) and Lysine Diisocyanate (LDI); the chain extender is one or a mixture of more of ethanolamine, diethanolamine, triethanolamine, triisopropanolamine and N, N-bis (2-hydroxypropyl) aniline. The leveling agent is BYK333 leveling agent of Picker company, the catalyst is organic metal catalyst, and the solvent is ethyl acetate.
In a second aspect, the invention further provides a preparation method of the yellowing-resistant high-transparency invisible car cover, which comprises the following steps:
s01, weighing polycarbonate diol, isocyanate, a chain extender and a solvent in the expected mass parts in a container, and stirring and dispersing for a period of time at room temperature;
s02, sequentially adding the leveling agent and the catalyst in the expected mass parts, and continuously stirring and dispersing for a period of time at room temperature to obtain the polyurethane coating;
and S03, coating the obtained polyurethane coating on a TPU transparent film through a coating machine, baking and curing to obtain the invisible car cover.
Further, in step S01 and step S02, the rotation speed of stirring and dispersing is 450rpm-800rpm, and the time of stirring and dispersing is 15min-30 min. In the step S03, the baking temperature is 95-120 ℃, and the baking time is 3-8 min; the curing temperature is 80-100 ℃, and the curing time is 10-20 h.
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the examples, the experimental methods used were all conventional methods unless otherwise specified, and the materials, reagents and the like used were commercially available without otherwise specified.
Example 1:
the embodiment provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by mass: 1000 parts of polycarbonate diol, 250 parts of isocyanate, 70 parts of chain extender, 10 parts of flatting agent, 10 parts of catalyst and 2000 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the embodiment comprises the following steps:
s01, weighing 1000 parts of PCDL2000 polycarbonate diol, 250 parts of isophorone diisocyanate (IPDI), 70 parts of triethanolamine and 2000 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ and the rotating speed of 550rpm for 15 min;
s02, sequentially adding 10 parts of BYK333 leveling agent and 10 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 550rpm for 15min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 3min at 100 ℃, and curing for 12h at 80 ℃ to obtain the invisible car cover 1-1.
Example 2:
the embodiment provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by mass: 1500 parts of polycarbonate diol, 350 parts of isocyanate, 100 parts of chain extender, 20 parts of flatting agent, 15 parts of catalyst and 3000 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the embodiment comprises the following steps:
s01, weighing 1500 parts of PCDL2000 polycarbonate diol, 350 parts of isophorone diisocyanate (IPDI), 100 parts of triethanolamine and 3000 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ and the rotating speed of 450rpm for 30 min;
s02, sequentially adding 20 parts of BYK333 leveling agent and 15 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 450rpm for 30min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 6min at 95 ℃, and curing for 10h at 100 ℃ to obtain the invisible car cover 1-2.
Example 3:
the embodiment provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by mass: 1200 parts of polycarbonate diol, 300 parts of isocyanate, 80 parts of chain extender, 15 parts of flatting agent, 12 parts of catalyst and 2400 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the embodiment comprises the following steps:
s01, weighing 1200 parts of PCDL2000 polycarbonate diol, 300 parts of isophorone diisocyanate (IPDI), 80 parts of triethanolamine and 2400 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ and the rotating speed of 600rpm for 20 min;
s02, sequentially adding 15 parts of BYK333 leveling agent and 12 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 600rpm for 20min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 3min at 120 ℃, and curing for 15h at 80 ℃ to obtain the invisible car cover 1-3.
Example 4:
the embodiment provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by mass: 1500 parts of polycarbonate diol, 320 parts of isocyanate, 90 parts of chain extender, 18 parts of flatting agent, 15 parts of catalyst and 2800 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the embodiment comprises the following steps:
s01, weighing 1500 parts of PCDL2000 polycarbonate diol, 320 parts of isophorone diisocyanate (IPDI), 90 parts of triethanolamine and 2800 parts of ethyl acetate, and stirring and dispersing at the room temperature of 25 ℃ and at the rotating speed of 800rpm for 15 min;
s02, sequentially adding 18 parts of BYK333 leveling agent and 15 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 800rpm for 15min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 8min at 95 ℃, and curing for 20h at 80 ℃ to obtain the invisible car cover 1-4.
Example 5:
the embodiment provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by mass: 1300 parts of polycarbonate diol, 330 parts of isocyanate, 95 parts of chain extender, 18 parts of flatting agent, 15 parts of catalyst and 2700 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the embodiment comprises the following steps:
s01, weighing 1300 parts of PCDL2000 polycarbonate diol, 330 parts of isophorone diisocyanate (IPDI), 95 parts of triethanolamine and 2700 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ at the rotating speed of 500rpm for 20 min;
s02, sequentially adding 18 parts of BYK333 leveling agent and 15 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 500rpm for 20min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 3min at 100 ℃, and curing for 12h at 80 ℃ to obtain the invisible car cover 1-5.
Example 6:
the embodiment provides a yellowing-resistant high-transparency invisible car cover, which comprises the following components in parts by mass: 1250 parts of polycarbonate diol, 320 parts of isocyanate, 95 parts of chain extender, 20 parts of flatting agent, 15 parts of catalyst and 3000 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the embodiment comprises the following steps:
s01, weighing 1250 parts of PCDL2000 polycarbonate diol, 320 parts of isophorone diisocyanate (IPDI), 95 parts of triethanolamine and 3000 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ and the rotating speed of 500rpm for 20 min;
s02, sequentially adding 20 parts of BYK333 leveling agent and 15 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 500rpm for 20min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 3min at 100 ℃, and curing for 12h at 80 ℃ to obtain the invisible car cover 1-6.
Comparative example 1:
the comparative example provides a yellowing-resistant high-transparency invisible car cover, and the raw materials of the car cover comprise the following components in parts by weight: 1500 parts of polycarbonate diol, 350 parts of isocyanate, 100 parts of chain extender, 20 parts of flatting agent, 15 parts of catalyst and 3000 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The raw materials of the car cover also comprise 15 parts of anti-ultraviolet auxiliary agent and 10 parts of antioxidant stabilizer.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the comparative example comprises the following steps:
s01, weighing 1500 parts of PCDL2000 polycarbonate diol, 350 parts of isophorone diisocyanate (IPDI), 100 parts of triethanolamine and 3000 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ and the rotating speed of 450rpm for 30 min;
s02, sequentially adding 20 parts of BYK333 leveling agent, 15 parts of dibutyltin dilaurate, 15 parts of ultraviolet-resistant auxiliary agent and 10 parts of antioxidant stabilizer, and continuously stirring and dispersing for 30min at the rotating speed of 450rpm under the environment of room temperature and 25 ℃ to obtain the polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 6min at 95 ℃, and curing for 10h at 100 ℃ to obtain the invisible car cover 2-1.
Comparative example 2:
the comparative example provides a yellowing-resistant high-transparency invisible car cover, and the raw materials of the car cover comprise the following components in parts by weight: 1800 parts of polycarbonate diol, 350 parts of isocyanate, 100 parts of chain extender, 20 parts of flatting agent, 15 parts of catalyst and 3000 parts of solvent; wherein, the polycarbonate diol is selected from PCDL2000, the isocyanate is selected from isophorone diisocyanate (IPDI), the chain extender is selected from triethanolamine, the leveling agent is selected from BYK333 leveling agent of Pico corporation, the catalyst is selected from dibutyltin dilaurate, and the solvent is ethyl acetate; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the comparative example comprises the following steps:
s01, weighing 1800 parts of PCDL2000 polycarbonate diol, 350 parts of isophorone diisocyanate (IPDI), 100 parts of triethanolamine and 3000 parts of ethyl acetate in a container, and stirring and dispersing at the room temperature of 25 ℃ at the rotating speed of 450rpm for 30 min;
s02, sequentially adding 20 parts of BYK333 leveling agent and 15 parts of dibutyltin dilaurate, and continuously stirring and dispersing at the rotating speed of 450rpm for 30min at the room temperature of 25 ℃ to obtain a polyurethane coating;
s03, coating the obtained polyurethane coating on the car cover base film through a coating machine, baking for 6min at 95 ℃, and curing for 10h at 100 ℃ to obtain the invisible car cover 2-2.
Comparative example 3:
the comparative example provides a yellowing-resistant high-transparency invisible car cover, and the paint of the car cover adopts a brand 1 paint with a large using range on the market; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the comparative example comprises the following steps: coating the brand 1 coating on the base film of the car cover by a coating machine, baking for 6min at 95 ℃, and curing for 10h at 100 ℃ to obtain the invisible car cover 2-3.
Comparative example 4:
the comparative example provides a yellowing-resistant high-transparency invisible car cover, and the paint of the car cover adopts brand 2 paint with a large using range on the market; the base film of the car cover is Kaiyang 277 TPU.
The preparation method of the yellowing-resistant high-transparency invisible car cover in the comparative example comprises the following steps: coating the brand 1 coating on the base film of the car cover by a coating machine, baking for 6min at 95 ℃, and curing for 10h at 100 ℃ to obtain the invisible car cover 2-3.
Effect example 1: appearance test
The appearance state of each of the stealth car covers in examples 1 to 6 and comparative examples 1 to 2 was directly observed by naked eyes as shown in table 1:
TABLE 1
As can be seen from Table 1, the polyurethane coatings obtained in examples 1 to 6 have good coating conditions; in the coating in the comparative example 1, due to the addition of the anti-ultraviolet auxiliary agent and the antioxidant stabilizer, the proportion of hard sections is too high, so that the coating is easy to separate and whiten; the coating polyol ratio in comparative example 2 was too high, resulting in difficulty in surface drying of the coating.
Effect example 2: performance testing
(1) And (3) transmittance test: samples of the invisible car covers of examples 1-6 and comparative examples 3-4 cut to 100mm x 10mm were placed on a spectrophotometer test stand according to the method required by standard GB/T2410-2008 and tested for visible light transmittance according to the test specifications;
(2) yellowness index change test: the invisible car clothes in examples 1-6 and comparative examples 3-4 were cut out into samples of 100mm x 10mm according to the method required by standard GB/T2410-2008; the yellowness index YI of each sample was then tested according to the experimental procedure specified in HG/T3862-20060(ii) a Then, placing each sample in a xenon lamp aging test box, performing an experiment for 204 hours, taking out the sample, recovering the sample to room temperature, and testing the yellow index YI of each sample after aging according to the experiment steps specified in HG/T3862-2006; calculating the yellow index variation Delta YI-YI0。
The results of each test are shown in table 2 below:
TABLE 2
As can be seen from table 2, the transmittance of the invisible car clothes in examples 1-6 is over 95%, which has higher transparency and transmittance than the invisible car clothes prepared by using the existing coating in comparative examples 3-4; in addition, the variation of the yellow index of the invisible car clothes in the examples 1-6 is obviously smaller than that of the invisible car clothes in the comparative examples 3-4, and compared with the existing invisible car clothes, the invisible car clothes in the examples 1-6 have better yellowing resistance.
According to the technical scheme of the embodiment, the anti-yellowing high-transparency invisible car cover provided by the invention is different from the traditional modification means in raw materials, the anti-yellowing performance of a system is improved by mainly relying on an antioxidant stabilizer and an anti-ultraviolet auxiliary agent, the raw materials are directly used, and polycarbonate diol and aliphatic isocyanate with relatively low unsaturation degree are selected as the main raw materials; most of carbonyl groups in the soft segment of the polycarbonate polyurethane system participate in the formation of hydrogen bonds, so that the polyurethane coating has better mechanical property and oxidation resistance, and the polycarbonate diol with relatively low unsaturation degree is selected, so that yellowing caused by oxidation of excessive unsaturated bonds and internal cyclization of acrylonitrile chain links can be effectively prevented; and the aliphatic isocyanate reduces the number of unsaturated double bonds of a benzene ring, and reduces the yellowing tendency of the polymer caused by the influence of external factors due to the existence of the unsaturated double bonds. The invention also provides a preparation method of the yellowing-resistant high-transparency invisible car cover, which is simple and easy to operate and has high yield.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the spirit and scope of the appended claims.
Claims (10)
1. The yellowing-resistant high-transparency invisible car cover is characterized by comprising the following components in parts by weight:
2. the yellowing-resistant high-transparency invisible car cover according to claim 1, wherein the raw materials of the car cover comprise the following components in parts by weight:
3. the yellowing-resistant high-transmittance invisible car cover according to claim 1 or 2, wherein the isocyanate is one or a mixture of two or more of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), 1, 5-Naphthalene Diisocyanate (NDI), Xylylene Diisocyanate (XDI) and Lysine Diisocyanate (LDI).
4. The yellowing-resistant high-transparency invisible car cover according to claim 1 or 2, wherein the chain extender is one or more of ethanolamine, diethanolamine, triethanolamine, triisopropanolamine and N, N-bis (2-hydroxypropyl) aniline.
5. The yellowing-resistant high-transparency invisible car cover according to claim 1 or 2, wherein the leveling agent is BYK333 leveling agent from Pico.
6. The yellowing-resistant high-transmittance invisible car cover according to claim 1 or 2, wherein the catalyst is an organic metal catalyst.
7. The yellowing-resistant high-transmittance invisible car cover according to claim 1 or 2, wherein the solvent is ethyl acetate.
8. The preparation method of the yellowing-resistant high-transparency invisible car cover is characterized by comprising the following steps of:
s01, weighing polycarbonate diol, isocyanate, a chain extender and a solvent in the expected mass parts in a container, and stirring and dispersing for a period of time at room temperature;
s02, sequentially adding the leveling agent and the catalyst in the expected mass parts, and continuously stirring and dispersing for a period of time at room temperature to obtain the polyurethane coating;
and S03, coating the obtained polyurethane coating on a TPU transparent film through a coating machine, baking and curing to obtain the invisible car cover.
9. The method for preparing the yellowing-resistant high-transparency invisible car cover according to claim 8, wherein in the steps S01 and S02, the rotation speed of stirring and dispersing is 450rpm-800rpm, and the time of stirring and dispersing is 15min-30 min.
10. The method for preparing the yellowing-resistant and high-transparency invisible car cover according to claim 8, wherein in the step S03, the baking temperature is 95-120 ℃ and the baking time is 3-8 min; the curing temperature is 80-100 ℃, and the curing time is 10-20 h.
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| CN202111675646.6A Pending CN114349929A (en) | 2021-12-31 | 2021-12-31 | Anti-yellowing high-transparency invisible car cover and preparation method thereof |
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| CN109735249A (en) * | 2018-12-27 | 2019-05-10 | 合肥乐凯科技产业有限公司 | A kind of dumb light lacquer painting protective film |
| CN109852272A (en) * | 2018-12-27 | 2019-06-07 | 合肥乐凯科技产业有限公司 | A kind of automobile painting surface protective film |
| CN111303754A (en) * | 2020-04-17 | 2020-06-19 | 中国科学院长春应用化学研究所 | Scratch-resistant wear-resistant polyurethane transparent coating with high adhesive force |
| WO2020218506A1 (en) * | 2019-04-24 | 2020-10-29 | 三菱ケミカル株式会社 | Thermoplastic polyurethane resin elastomer |
| CN112358844A (en) * | 2020-10-22 | 2021-02-12 | 东莞市研思新材料科技有限公司 | Never-yellowing TPU (thermoplastic polyurethane) film glue for coating and preparation method and application thereof |
| CN112831012A (en) * | 2021-02-20 | 2021-05-25 | 广州昊毅新材料科技股份有限公司 | Water-based self-repairing coating and coating for TPU invisible car cover |
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| CN109735249A (en) * | 2018-12-27 | 2019-05-10 | 合肥乐凯科技产业有限公司 | A kind of dumb light lacquer painting protective film |
| CN109852272A (en) * | 2018-12-27 | 2019-06-07 | 合肥乐凯科技产业有限公司 | A kind of automobile painting surface protective film |
| WO2020218506A1 (en) * | 2019-04-24 | 2020-10-29 | 三菱ケミカル株式会社 | Thermoplastic polyurethane resin elastomer |
| CN111303754A (en) * | 2020-04-17 | 2020-06-19 | 中国科学院长春应用化学研究所 | Scratch-resistant wear-resistant polyurethane transparent coating with high adhesive force |
| CN112358844A (en) * | 2020-10-22 | 2021-02-12 | 东莞市研思新材料科技有限公司 | Never-yellowing TPU (thermoplastic polyurethane) film glue for coating and preparation method and application thereof |
| CN112831012A (en) * | 2021-02-20 | 2021-05-25 | 广州昊毅新材料科技股份有限公司 | Water-based self-repairing coating and coating for TPU invisible car cover |
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