Light stabilizer composition as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of materials, and particularly relates to a light stabilizer composition as well as a preparation method and application thereof. The light stabilizer composition is prepared from the following raw materials in percentage by weight: 10-40% of an ultraviolet absorbent I, 0-16% of an ultraviolet absorbent II, 10-30% of a hindered amine light stabilizer I, 10-30% of a hindered amine light stabilizer II, 1-10% of a phenolic antioxidant and 1-20% of a phosphite antioxidant. The preparation method comprises the following steps: uniformly mixing the raw materials in a liquid state in the light stabilizer composition, and heating to 40-60 DEG C; and then uniformly spraying the mixture onto a mixed powder raw material obtained by uniformly mixing the raw materials in the powder state in the light stabilizer composition to finally obtain the light stabilizer composition. The anti-ultraviolet additive is used as an additive of raw materials for preparing a product exposed in an ultraviolet environment for a long time, and the product obtained when the addition amount of the anti-ultraviolet additive is 0.4 wt% has good anti-ultraviolet, anti-yellowing and anti-aging properties and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of materials, and particularly relates to the technical field of light stabilizers. Background Art

[0002] Thermoplastic polyurethane (TPU) is a polymer material with excellent mechanical properties, wear resistance and elasticity, and is widely used in fields such as automotive interiors, electronic product casings, medical devices, and shoe materials. The superior properties of TPU have enabled it to occupy an important position in the market. However, when TPU is exposed to ultraviolet (UV) environment for a long time, it is prone to photo-degradation, resulting in problems such as a decrease in the physical properties of the material, color fading, and embrittlement. This photo-degradation phenomenon not only affects the service life of TPU, but also limits its application in products that are exposed to ultraviolet environment (outdoors and high-UV environments) for a long time.

[0003] Existing light stabilizers mainly include ultraviolet absorbers (UVA) and hindered amine light stabilizers (HALS), etc. Common ultraviolet absorbers such as benzotriazoles (such as UV328, UV329) and benzophenones (such as UV-531), etc., can effectively absorb UV radiation and slow down the photo-degradation of TPU. Common hindered amine light stabilizers such as 770, 944, 622, 119, etc. However, when these light stabilizers are used in TPU materials, the following problems often exist: Poor performance: The light aging resistance performance after adding the composite light stabilizer fails to meet the requirements, the color change is too large, and at the same time the physical property retention rate (mainly referring to the tensile strength and elongation at break) is not as expected.

[0004] Poor composite effect: The compatibility and dispersibility of different types of light stabilizers in TPU are poor, which may lead to a light stabilization effect that is not as expected.

[0005] High cost: High-performance composite light stabilizers often have a high cost, increasing the production cost of TPU materials and limiting their competitiveness in some applications.

[0006] Insufficient environmental protection: Although some light stabilizers claim to be environmentally friendly, their actual degradability and impact on the ecological environment still need to be further verified. Summary of the Invention

[0007] One of the purposes of the present application is to provide a light stabilizer composition to solve the above technical problems. This light stabilizer composition has good light aging resistance performance, small color change, good physical and chemical stability such as tensile strength and elongation at break, and at the same time has the characteristics of low cost and good environmental protection performance.

[0008] The second object of the present application is to provide a preparation method of the above-mentioned light stabilizer composition, which has the characteristics of simple process, good uniformity of raw material mixing, wide applicability, etc.

[0009] The third object of the present invention is to provide an additive application of the above-mentioned light stabilizer composition as a raw material for preparing products that are long-term exposed to an ultraviolet environment.

[0010] The technical solution of the present application In the first aspect, the present application provides a light stabilizer composition, adopting the following technical solution: A light stabilizer composition, calculated by mass percentage, the raw material composition and content used for its preparation are as follows: The above-mentioned ultraviolet absorber I includes one or a composite of two or more of benzotriazole type I, benzotriazine type, oxanilide type or benzoxazine type ultraviolet absorbers; Among them, the benzotriazole type ultraviolet absorber I is Eversorb 109 (liquid), Tinuvin 360, Tinuvin928; The benzotriazine type ultraviolet absorber is Tinuvin 1577, Cyasorb UV-1164, Tinuvin 400 (liquid) or Tinuvin120; The oxanilide ultraviolet absorber type is Tinuvin 312; The benzoxazine type ultraviolet absorber is Cyasorb UV-3638; The above-mentioned ultraviolet absorber II, when the main light stabilizer composition is used, is used for granulation kneading, and is one or a composite of two of benzotriazole type ultraviolet absorber II and formamidine type ultraviolet absorber; Among them, the benzotriazole type ultraviolet absorber II is Tinuvin 384 (liquid), Lowilite 1130 (liquid) or Tinuvin571; The above-mentioned formamidine type ultraviolet absorber is UV-1 (liquid), UV-3 or a composite of UV-1 and UV-3; The above-mentioned hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400-1000, and the hindered amine light stabilizer with a molecular weight of 400-1000 is Tinuvin 770, Tinuvin292 (liquid), Tinuvin765 (liquid), Tinuvin123 (liquid), Tinuvin144, Uvinul 4050, Uvinul 4049H, ADK STAB LA-57 or ADK STABLA-52; The above-mentioned hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000-4000. The hindered amine light stabilizer with a molecular weight of 2000-4000 is Tinuvin 622, Tinuvin 119, Tinuvin 944, Chimassorb 2020, Uvinul 5050H, or Tinuvin NOR 371; The above-mentioned phenolic antioxidant is ADK STAB AO-50, CCP STAB 390 (liquid), CCP STAB 390E (liquid), Anox 1315 (liquid), or Irganox 1010; The above-mentioned phosphite antioxidant is Irgafos 168, CCP STAB 508 (liquid), CCP STAB 3014 (liquid), Weston 618F or Ultranox 626.

[0011] Note: In the raw materials used for preparing the above-mentioned light stabilizer composition of the present application, except for the raw materials marked in brackets as liquid state, other raw materials are all in powder state.

[0012] Adopting the above technical solution, since the ultraviolet absorber I and ultraviolet absorber II can effectively absorb ultraviolet rays with wavelengths of 290-410 nm and rarely absorb visible light, the process of absorbing ultraviolet light energy and converting it into heat can reduce the absorption of ultraviolet light by the product prepared using it, thereby reducing the temperature of the product and extending the service life of the product. At the same time, due to the use of the hindered amine light stabilizer I and hindered amine light stabilizer II, the activity of free radicals generated by ultraviolet radiation is captured and eliminated, thereby reducing the material aging rate of the product. The combined use of the two greatly increases the light stability performance; the phenolic antioxidant has the function of capturing alkoxy free radicals, which can reduce the oxidation rate of the product and extend the service life of the product. The phosphite antioxidant has the function of decomposing hydroperoxides, can significantly improve the color of the product after aging, and has a synergistic effect with the phenolic antioxidant, greatly extending and enhancing the antioxidant performance. A light stabilizer composition of the present application has good thermal stability, light stability, and anti-yellowing aging performance under the synergistic action of the ultraviolet absorber I, ultraviolet absorber II, hindered amine light stabilizer I, hindered amine light stabilizer II, phenolic antioxidant, and phosphite antioxidant.

[0013] In the specific embodiments of the present application, only the following preferred raw material compositions and contents are used for illustration, but it does not limit the composition and content of other specific raw materials used in the above technical solution.

[0014] Preferred: For a light stabilizer composition as described above, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: The above ultraviolet absorber I is a benzotriazole ultraviolet absorber I, or a composite of a benzotriazine ultraviolet absorber and a benzotriazole ultraviolet absorber I, or a composite of a benzotriazole ultraviolet absorber I and an oxanilide ultraviolet absorber Tinuvin 312, or a composite of a benzotriazole ultraviolet absorber I, an oxanilide ultraviolet absorber Tinuvin 312 and a benzoxazine ultraviolet absorber Cyasorb UV-3638; When the ultraviolet absorber I is a benzotriazole ultraviolet absorber I, the benzotriazole ultraviolet absorber I is Tinuvin 360, or is composed of Tinuvin 360 and Tinuvin 928 in a mass ratio of 23:8; When the ultraviolet absorber I is a composite of a benzotriazine ultraviolet absorber and a benzotriazole ultraviolet absorber I, the benzotriazole ultraviolet absorber I used in the composite is Tinuvin 360 or Tinuvin 928, and the benzotriazine ultraviolet absorber is Tinuvin 400; the mass ratios of Tinuvin 400 to Tinuvin 360 and Tinuvin 400 to Tinuvin 928 are both 23:8; When the ultraviolet absorber I is a composite of a benzotriazole ultraviolet absorber I and an oxanilide ultraviolet absorber Tinuvin 312, the benzotriazole ultraviolet absorber I used in the composite is Tinuvin 360, and the mass ratio of Tinuvin 360 to Tinuvin 312 is 23:8; When the ultraviolet absorber I is a composite of a benzotriazole ultraviolet absorber I, an oxanilide ultraviolet absorber Tinuvin 312 and a benzoxazine ultraviolet absorber Cyasorb UV-3638, the benzotriazole ultraviolet absorber I is Tinuvin 360, and the mass ratio of Tinuvin 360, Tinuvin 312 to Cyasorb UV-3638 is 8:23:8; The ultraviolet absorber II is a benzotriazole ultraviolet absorber II, or a formamidine ultraviolet absorber; the benzotriazole ultraviolet absorber II is Lowilite 1130, and the formamidine ultraviolet absorber is UV-1 or a composite of UV-1 and UV-3 in a ratio of 1:1; the hindered amine light stabilizer I is Tinuvin 770 or Tinuvin 292; The hindered amine light stabilizer II is Tinuvin 622 or Tinuvin 119; The phenolic antioxidant is ADK STAB AO-50 or Anox 1315; The phosphite antioxidant is Irgafos 168, Ultranox 626 or Weston 618F.

[0015] Preferably, for the light stabilizer composition, calculated by mass percentage, the raw material composition and content used for its preparation are as follows:

[0016] Furthermore, preferably, for the light stabilizer composition, calculated by mass percentage, the raw material composition and content used for its preparation are as follows:

[0017] Among them, ultraviolet absorber I is Tinuvin 360 and Tinuvin 312, compounded in a mass ratio of Tinuvin 360: Tinuvin 312 of 23:8; The formamidine ultraviolet absorber of ultraviolet absorber II is UV-1; The hindered amine light stabilizer I is Tinuvin292; The hindered amine light stabilizer II is Tinuvin 119; The phenolic antioxidant is ADK STAB AO-50; The phosphite antioxidant is Ultranox 626.

[0018] Adopting the above technical solution A light stabilizer composition of the present application, due to the specific component composition and content of ultraviolet absorber I, ultraviolet absorber II, hindered amine light stabilizer I, hindered amine light stabilizer II, phenolic antioxidant and phosphite antioxidant, thus has better thermal stability, light stability and anti-yellowing aging performance.

[0019] In the second aspect, the present application provides a preparation method of a light stabilizer composition, adopting the following technical solution: The preparation method of the above-mentioned light stabilizer composition is as follows: First, mix all the raw materials in powder form in the light stabilizer composition evenly to obtain a mixed powder raw material; Then, mix the raw materials in liquid form in the light stabilizer composition evenly to obtain a mixed liquid raw material; Finally, heat the above-mentioned mixed liquid raw material to 40-60 °C, and then evenly spray it on the above-mentioned obtained mixed powder raw material and stir evenly to obtain the light stabilizer composition.

[0020] With the above technical solution, since the preparation process of the light stabilizer composition is only the mixing of liquid raw materials, heating, and then spraying onto the powdered raw materials obtained by mixing, the preparation method has the characteristics of simple preparation process, convenient operation, good mixing uniformity, and wide applicability.

[0021] In the third aspect of the present application, the above-mentioned light stabilizer composition is provided for use as an additive in the raw materials used for the preparation of products that are long-term exposed to an ultraviolet environment, and its addition amount is 0.2 - 0.8 wt% of the raw materials used for the preparation. In the examples of the present application, only the dosage of 0.4 wt% is used for illustration. However, in actual applications, an addition amount of 0.2 wt% can achieve good ultraviolet resistance, anti-yellowing aging and other properties. Considering the cost of the preparation raw materials comprehensively, it is preferably 0.4 - 0.8 wt%.

[0022] In the present application, only the TPU material, which is the raw material used for the preparation of products that are long-term exposed to an ultraviolet environment, is used for illustration, and it does not limit the application of the light stabilizer composition as an additive in other materials such as polyurethane sponges, polyurethane adhesives, or epoxy coatings.

[0023] With the above technical solution, since a light stabilizer composition has good thermal stability, light stability, and anti-aging properties, the TPU material products finally obtained with an addition amount of 0.4 wt% are not prone to photodegradation, are not easily embrittled, and have good anti-yellowing effects and good weather resistance.

[0024] In addition, some components in the light stabilizer or the intermediate products after aging can react with the polymer chains of the polymers used in the product preparation, thereby slowing down or delaying the chain scission reaction caused by ultraviolet rays. This heavy chain transfer mechanism can improve the weather resistance of the product and physical properties such as the tensile strength and elongation at break of the product.

[0025] Preferably, when the above-mentioned light stabilizer composition is used as an additive in the raw materials used for the preparation of products that are long-term exposed to an ultraviolet environment, the light stabilizer composition can be directly mixed evenly with the powdered raw materials such as TPU powder used for the preparation of products that are long-term exposed to an ultraviolet environment.

[0026] The beneficial technical effects of the present application For the light stabilizer composition of the present application, due to the combined application of different ultraviolet absorbers, hindered amine light stabilizers with different molecular weights, and different antioxidants, the ultraviolet resistance, anti-yellowing aging and other properties are synergistically enhanced when it is used as an additive in products such as TPU materials that are long-term exposed to an ultraviolet environment.

[0027] Furthermore, for the light stabilizer composition of the present application, since the raw materials are widely sourced and low in price, the raw material cost for the preparation of the light stabilizer composition is low.

[0028] Furthermore, a light stabilizer composition of the present application does not contain low-volatile organic compounds (VOCs), lead, cadmium, mercury and other heavy metals, meeting the requirements of environmental protection and ecological friendliness.

[0029] Furthermore, a light stabilizer composition of the present application is used as an additive for raw materials in the preparation of products in outdoor and high-UV environments. When the addition amount is only 0.4 wt%, the finally obtained product has good anti-ultraviolet and anti-yellowing effects. Therefore, the product using this light stabilizer composition is not prone to photodegradation, embrittlement, and has good weather resistance. At the same time, when the light stabilizer composition is applied, some of its components or intermediate products after aging can react with the polymer chains used in the product preparation, thereby slowing down or delaying the chain breakage reaction caused by ultraviolet rays. This heavy chain transfer mechanism can improve the weather resistance and physical properties of the product, so that the physical properties of the product remain stable, especially the tensile strength and elongation at break may be better.

[0030] Furthermore, for a light stabilizer composition of the present application, since the preparation process of the light stabilizer composition is only the mixing of liquid raw materials, heating, and then spraying onto the mixed powder raw materials, this preparation method has the characteristics of simple preparation process, convenient operation, good mixing uniformity, and wide applicability. Detailed Embodiments

[0031] The present application will be explained below through specific embodiments, but the present application is not limited thereby.

[0032] The information of the equipment names, models, and manufacturers used in the preparation or the following performance index test methods (the analysis conditions of the analysis equipment are described in specific embodiments) of the embodiments of the present application is as follows: The test methods for the yellowing resistance and anti-aging performance indexes of the embodiments of the present application are as follows: 1. Preparation of samples for testing: Using a twin-screw extruder (main machine speed 200 r / min, feeder frequency 20 HZ), add the light stabilizer composition obtained in each embodiment to TPU powder (the dosage ratio of the light stabilizer composition to TPU powder is 0.4:100 by mass), control the temperature of the twin-screw extruder at 180 °C for co-mixing and extrusion granulation. The obtained TPU particles containing the light stabilizer composition are injection molded by an injection molding machine at a controlled injection temperature of 190 °C to obtain a sample for testing with a size of 80 mm * 60 mm * 2 mm.

[0033] 2. Test method for yellowing resistance and anti-aging performance: Bulb type yellowing resistance performance: According to Method A in the test standard of HG / T 3689-2014 Footwear - Yellowing resistance test, using an UltraScan VIS color difference meter, D65 / 10 (observation light source / observation angle), colorimetry was carried out on the samples to be tested before aging, after aging for 24h, 48h, and 72h respectively. Taking the initial state of each sample as a blank control, the characterization index YI E313 of the yellowing resistance degree was calculated respectively, and ΔYI after aging for 24h, 48h, and 72h was calculated; Tube type yellowing resistance performance: According to Method B in the test standard of HG / T 3689-2014 Footwear - Yellowing resistance test, using an UltraScan VIS color difference meter, D65 / 10 (observation light source / observation angle), the samples to be tested before aging, after aging for 24h, 48h, and 72h were observed respectively. Taking the initial state of each sample as a blank control, the characterization index YI E313 of the yellowing resistance degree was calculated respectively, and ΔYI after aging for 24h, 48h, and 72h was calculated; Fluorescent ultraviolet aging performance: According to Method A in the test standard of GB / T 16422.3-2022 / ISO 4892.3:2016, at a wavelength of 340nm with an irradiance of 0.68W / (m 2 .nm) and a blackboard temperature of 60°C ± 3°C, the samples to be tested were aged. Using an UltraScan VIS color difference meter, D65 / 10 (observation light source / observation angle), colorimetry was carried out on the samples to be tested before aging and after aging for 168h respectively. Taking the initial state of each sample as a blank control, the characterization index YI E313 of the yellowing resistance degree was calculated, and ΔYI was calculated; Window sill exposure (simulating relative ultraviolet light irradiation of sunlight) aging resistance performance test: According to Method B in the test standard of GB / T 16422.3-2022 / ISO4892.3:2016, using an UltraScan VIS color difference meter, D65 / 10 (observation light source / observation angle), colorimetry was carried out on the samples to be tested before aging, after aging for 1 week (168h), 2 weeks (336h), 3 weeks (504h), 4 weeks (672h), 5 weeks (840h), 6 weeks (1008h), 7 weeks (1176h), and 8 weeks (1344h) respectively. Taking the initial state of each sample as a blank control, the characterization index YI E313 of the yellowing resistance degree was calculated respectively, and ΔYI after 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 7 weeks, and 8 weeks was calculated.

[0034] In each embodiment of the present application, all raw materials used in the preparation of the light stabilizer composition are commercially available. Those not marked as liquids are all solid powder raw materials with a particle size of 10μm to 1000μm.

[0035] Example 1 A light stabilizer composition, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Among the following raw materials, except for the raw materials marked as liquid, the others are all solid powder raw materials; The above ultraviolet absorber I is a benzotriazole ultraviolet absorber I; the benzotriazole ultraviolet absorber I is composed of Tinuvin360 and Tinuvin 928, compounded according to the mass ratio of Tinuvin 360: Tinuvin 928 of 23:8; The ultraviolet absorber II is the ultraviolet absorber used for granulation and kneading, which is a benzotriazole ultraviolet absorber II, and the benzotriazole ultraviolet absorber II is Lowilite 1130 (liquid); The hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400-1000, and the hindered amine light stabilizer with a molecular weight of 400-1000 is Tinuvin 770; The hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000-4000, and the hindered amine light stabilizer with a molecular weight of 2000-4000 is Tinuvin 119; The phenolic antioxidant is ADK STAB AO-50; The phosphite antioxidant is Ultranox 626.

[0036] The preparation method of the above light stabilizer composition is as follows: First, mix all the raw materials in powder state in the light stabilizer composition evenly to obtain a mixed powder raw material; Then, mix the raw materials in liquid state in the light stabilizer composition evenly to obtain a mixed liquid raw material; Finally, heat the above mixed liquid raw material to 40-60 °C, and then evenly spray it on the above obtained mixed powder raw material and stir evenly to obtain a light stabilizer composition, denoted as light stabilizer composition A.

[0037] Example 2 A light stabilizer composition, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Among the following raw materials, except for the raw materials marked as liquid, the others are all solid powder raw materials; The above-mentioned ultraviolet absorber I is composed of a benzotriazole ultraviolet absorber I and a benzotriazine ultraviolet absorber. Among them, the benzotriazole ultraviolet absorber I is Tinuvin 928, and the benzotriazine ultraviolet absorber is Tinuvin 400 (liquid). The mass ratio of Tinuvin 400 to Tinuvin 928 is 23:8; The ultraviolet absorber II is a benzotriazole ultraviolet absorber II, and the benzotriazole ultraviolet absorber II is Lowilite 1130 (liquid); The hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400-1000, and the hindered amine light stabilizer with a molecular weight of 400-1000 is Tinuvin 770; The hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000-4000, and the hindered amine light stabilizer with a molecular weight of 2000-4000 is Tinuvin 622; The phenolic antioxidant is ADK STAB AO-50; The phosphite antioxidant is Irgafos 168.

[0038] The preparation method of the above-mentioned light-stable composition is the same as that of Example 1, and finally a light-stable composition is obtained, denoted as light stabilizer composition B.

[0039] Example 3 A light stabilizer composition, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Among the following raw materials, except for the raw materials marked as liquid, the others are all solid powder raw materials; The above-mentioned ultraviolet absorber I is composed of a benzotriazole ultraviolet absorber I and a benzotriazine ultraviolet absorber. Among them, the benzotriazole ultraviolet absorber I is Tinuvin 360, and the benzotriazine ultraviolet absorber is Tinuvin 400 (liquid); the mass ratio of Tinuvin 360 to Tinuvin 400 is 23:8; The ultraviolet absorber II is a formamidine ultraviolet absorber, and the formamidine ultraviolet absorber is UV-1 (liquid); The hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400-1000, and the hindered amine light stabilizer with a molecular weight of 400-1000 is Tinuvin292 (liquid); The hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000 - 4000, and the hindered amine light stabilizer with a molecular weight of 2000 - 4000 is Tinuvin 622; The phenolic antioxidant is ADK STAB AO - 50; The phosphite antioxidant is Weston 618F.

[0040] The preparation method of the above light - stable composition is the same as that of Example 1, and finally a light - stable composition is obtained, denoted as light stabilizer composition C.

[0041] Example 4 A light stabilizer composition, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Among the following raw materials, except for the raw materials marked as liquid, the others are all solid powder - like raw materials; The above ultraviolet absorber I is a benzotriazole - type ultraviolet absorber I; the benzotriazole - type ultraviolet absorber I is Tinuvin 360; Ultraviolet absorber II is a formamidine - type ultraviolet absorber, and the formamidine - type ultraviolet absorber is composed of UV - 1 (liquid) and UV - 3 compounded in a mass ratio of 1:1; The hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400 - 1000, and the hindered amine light stabilizer with a molecular weight of 400 - 1000 is Tinuvin292 (liquid); The hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000 - 4000, and the hindered amine light stabilizer with a molecular weight of 2000 - 4000 is Tinuvin 119; The phenolic antioxidant is Anox 1315 (liquid); The phosphite antioxidant is Ultranox 626.

[0042] The preparation method of the above light - stable composition is the same as that of Example 1, and finally a light - stable composition is obtained, denoted as light stabilizer composition D.

[0043] Example 5 A light stabilizer composition, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Among the following raw materials, except for the raw materials marked as liquid, the others are all solid powder - like raw materials; The above ultraviolet absorber I is composed of a benzotriazole ultraviolet absorber I and an oxanilide or benzoxazine ultraviolet absorber. The benzotriazole ultraviolet absorber I is Tinuvin 360; the oxanilide ultraviolet absorber is Tinuvin 312; the mass ratio of Tinuvin 360: Tinuvin 312 is 23:8; The ultraviolet absorber II is a formamidine ultraviolet absorber, and the formamidine ultraviolet absorber is UV-1 (liquid); The hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400-1000, and the hindered amine light stabilizer with a molecular weight of 400-1000 is Tinuvin292 (liquid); The hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000-4000, and the hindered amine light stabilizer with a molecular weight of 2000-4000 is Tinuvin 119; The phenolic antioxidant is ADK STAB AO-50; The phosphite antioxidant is Ultranox 626.

[0044] The preparation method of the above light-stable composition is the same as that of Example 1, and finally a light-stable composition is obtained, denoted as light stabilizer composition E.

[0045] Example 6 A light stabilizer composition, calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Among the following raw materials, except for the raw materials marked as liquid, the others are all solid powder raw materials; The above ultraviolet absorber I is composed of a benzotriazole ultraviolet absorber I, an oxanilide ultraviolet absorber and a benzoxazine ultraviolet absorber. The benzotriazole ultraviolet absorber I is Tinuvin 360; the oxanilide ultraviolet absorber is Tinuvin 312; the benzoxazine ultraviolet absorber is Cyasorb UV-3638; the compounding ratio is Tinuvin 360: Tinuvin 312: Cyasorb UV-3638 = 8:23:8; The hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400-1000, and the hindered amine light stabilizer with a molecular weight of 400-1000 is Tinuvin292 (liquid); The hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2,000 - 4,000, and the hindered amine light stabilizer with a molecular weight of 2,000 - 4,000 is Tinuvin 119; The phenolic antioxidant is ADK STAB AO - 50; The phosphite antioxidant is Ultranox 626.

[0046] The preparation method of the above light - stabilizing composition is the same as that of Example 1, and finally a light - stabilizing composition is obtained, denoted as light stabilizer composition F.

[0047] The aging properties of the light stabilizer compositions A, B, C, D, E, and F obtained in the above Examples 1 - 6 before and after aging in a bulb (sun lamp) type, a lamp tube (UVB) type, a fluorescent ultraviolet aging chamber, and exposure to sunlight on a windowsill were measured, and the results are shown in Tables 1 - 4 as follows: Table 1. YIE313 (YI in the table) and ΔYIE313 (ΔYI in the table) before aging, after aging for 24 h, 48 h, and 72 h in a bulb (sun lamp) type: As can be seen from the above table, the performance of light stabilizer composition A is basically equivalent to that of light stabilizer compositions D, E, and C. The performance of light stabilizer compositions B and F is relatively poor.

[0048] Table 2. YIE313 (YI in the table) and ΔYIE313 (ΔYI in the table) before aging, after aging for 24 h, 48 h, and 72 h in a lamp tube (UVB) type As can be seen from the above table, the anti - yellowing or anti - aging effects of light stabilizer compositions E and C are the best, followed by light stabilizer composition D. The performance of light stabilizer composition B is equivalent to that of light stabilizer composition A, and the performance of light stabilizer composition F is better than that of light stabilizer composition A.

[0049] Table 3. YIE313 (YI in the table) and ΔYIE313 (ΔYI in the table) before aging and after aging for 168 h in a fluorescent ultraviolet aging chamber As can be seen from the above table, compositions E and D perform the best, followed by compositions C, B, and A. The performance of the solid - formulation composition F is relatively poor.

[0050] Table 4. YIE313 (YI in the table) and ΔYIE313 (ΔYI in the table) of the window sill before exposure to sunlight, after 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 7 weeks, and 8 weeks of aging As can be seen from the above table, by the 8th week, the composition A had the best natural sunlight resistance and anti-yellowing performance, followed by composition D and composition E, then composition C. The performance of composition B and composition F was relatively poor.

[0051] The performance summary of YI and ΔYI of different light stabilizer compositions obtained in Examples 1 - 6 before and after aging is as follows: Under the aging conditions of a bulb (sun lamp): The performance of light stabilizer composition A was basically equivalent to that of light stabilizer composition D, light stabilizer composition E, and light stabilizer composition C. The performance of light stabilizer composition B and light stabilizer composition F was relatively poor.

[0052] Under the aging conditions of a lamp tube (313nm): Light stabilizer composition E and light stabilizer composition C showed the best performance, followed by light stabilizer composition D, light stabilizer composition B, and light stabilizer composition F. The performance of light stabilizer composition F was better than that of composition A, and the performance of light stabilizer composition B was equivalent to that of light stabilizer composition A; Under the aging conditions of a fluorescent ultraviolet lamp: Light stabilizer composition E and light stabilizer composition D showed the best performance, followed by light stabilizer composition C, light stabilizer composition B, and light stabilizer composition A. The performance of composition F was relatively poor; Under the exposure to sunlight on the window sill: By the 8th week, the composition A had the best natural sunlight resistance and anti-yellowing performance, followed by composition D and composition E, then composition C. The performance of composition B and composition F was relatively poor.

[0053] Based on the above results, it can be seen that for the light stabilizer compositions of the present application, the preferred light stabilizer compositions are D, C, and E, the further preferred light stabilizer compositions are D and E, and the particularly preferred light stabilizer composition is E. Due to the combined application of different ultraviolet absorbers, hindered amine light stabilizers with different molecular weights, and different antioxidants in the raw materials used for preparing the light stabilizer compositions, the anti-ultraviolet and anti-yellowing aging performances are synergistically enhanced. Moreover, the raw materials used have low cost and no pollution, meeting the environmental protection requirements. The products after their application not only have good light aging resistance and small color change, but also have good physical and chemical stability such as tensile strength and elongation at break. The preparation method has the characteristics of simple preparation process, convenient operation, good mixing uniformity, and wide applicability.

[0054] The specific embodiments of the present application are only interpretations of the present application and do not limit the present application. After reading this specification, those skilled in the art can make modifications to these embodiments that do not contribute creatively as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A light stabilizer composition, characterized in that The light stabilizer composition described above, calculated by mass percentage, has the following raw material composition and content used in its preparation: Ultraviolet absorber I: 10 - 40% Ultraviolet absorber II: 0 - 16% Hindered amine light stabilizer I: 10 - 30% Hindered amine light stabilizer II: 10 - 30% Phenolic antioxidant: 1 - 10% Phosphite antioxidant: 1 - 20%; The above ultraviolet absorber I is one of benzotriazole type I, benzotriazine type, oxanilide type or benzoxazine type ultraviolet absorbers or a composite of two or more of them; Among them, the benzotriazole type ultraviolet absorber I is one of Eversorb 109, Tinuvin 360 and Tinuvin 928 or a composite of two or more of them; The benzotriazine type ultraviolet absorber is Tinuvin 1577, Cyasorb UV - 1164, Tinuvin 400 or Tinuvin120; The oxanilide ultraviolet absorber type is Tinuvin 312; The benzoxazine type ultraviolet absorber is Cyasorb UV - 3638; The above ultraviolet absorber II is one of benzotriazole type ultraviolet absorber II or formamidine type ultraviolet absorber or a composite; Among them, the benzotriazole type ultraviolet absorber II is Tinuvin 384, Lowilite 1130 or Tinuvin 571; The formamidine type ultraviolet absorber is UV - 1, UV - 3 or a composite of UV - 1 and UV - 3; The above hindered amine light stabilizer I is a hindered amine light stabilizer with a molecular weight of 400 - 1000, and the hindered amine light stabilizer with a molecular weight of 400 - 1000 is Tinuvin 770, Tinuvin292, Tinuvin765, Tinuvin123, Tinuvin144, Uvinul 4050, Uvinul 4049H, ADK STAB LA - 57 or ADK STAB LA - 52; The above hindered amine light stabilizer II is a hindered amine light stabilizer with a molecular weight of 2000 - 4000, and the hindered amine light stabilizer with a molecular weight of 2000 - 4000 is Tinuvin 622, Tinuvin 119, Tinuvin 944, Chimassorb2020, Uvinul 5050H, or Tinuvin NOR 371; The above phenolic antioxidant is ADK STAB AO - 50, CCP STAB 390, CCP STAB 390E, Anox 1315 or Irganox 1010; The above phosphite antioxidant is Irgafos 168, CCP STAB 508, CCP STAB 3014, Weston 618F or Ultranox 626.

2. A light-stable composition according to claim 1, characterized in that, The light stabilizer composition described above, calculated by mass percentage, has the following raw material composition and content used in its preparation: (1 - 6) Ultraviolet absorber I: 23 - 39% Ultraviolet absorber II: 0 - 16% Hindered amine light stabilizer I 20% Hindered amine light stabilizer II 20% Phenolic antioxidant 8% Phosphite antioxidant 13%.

3. A light-stable composition according to claim 2, characterized in that, Among the raw materials used for its preparation: Ultraviolet absorber I is benzotriazole ultraviolet absorber I, or a composite of benzotriazine ultraviolet absorber and benzotriazole ultraviolet absorber I, or a composite of benzotriazole ultraviolet absorber I and oxanilide ultraviolet absorber Tinuvin 312, or a composite of benzotriazole ultraviolet absorber I, oxanilide ultraviolet absorber Tinuvin 312 and benzoxazine ultraviolet absorber Cyasorb UV-3638; When ultraviolet absorber I is benzotriazole ultraviolet absorber I, the benzotriazole ultraviolet absorber I is Tinuvin 360, or a composite of Tinuvin 360 and Tinuvin 928 with a mass ratio of 23:8; When ultraviolet absorber I is a composite of benzotriazine ultraviolet absorber and benzotriazole ultraviolet absorber I, the benzotriazole ultraviolet absorber I used in the composite is Tinuvin 360 or Tinuvin 928, and the benzotriazine ultraviolet absorber is Tinuvin 400; the mass ratios of Tinuvin 400 to Tinuvin 360 and Tinuvin 400 to Tinuvin 92 are both 23:8; When ultraviolet absorber I is a composite of benzotriazole ultraviolet absorber I and oxanilide ultraviolet absorber Tinuvin 312, the benzotriazole ultraviolet absorber I used in the composite is Tinuvin 360, and the mass ratio of Tinuvin 360 to Tinuvin 312 is 23:8; When ultraviolet absorber I is a composite of benzotriazole ultraviolet absorber I, oxanilide ultraviolet absorber Tinuvin 312 and benzoxazine ultraviolet absorber Cyasorb UV-3638, the benzotriazole ultraviolet absorber I is Tinuvin 360, and the mass ratio of Tinuvin 360, Tinuvin 312 to Cyasorb UV-3638 is 8:23:8; Ultraviolet absorber II is benzotriazole ultraviolet absorber II, or formamidine ultraviolet absorber; the benzotriazole ultraviolet absorber II is Lowilite 1130, and the formamidine ultraviolet absorber is UV-1 or a composite of UV-1 and UV-3 in a ratio of 1:1; Hindered amine light stabilizer I is Tinuvin 770 or Tinuvin 292; Hindered amine light stabilizer II is Tinuvin 622 or Tinuvin 119; Phenolic antioxidant is ADK STAB AO-50 or Anox 1315; Phosphite antioxidant is Irgafos 168, Ultranox 626 or Weston 618F.

4. A light-stable composition according to claim 3, characterized in that, For the said light-stabilizing composition, calculated by mass percentage, the raw material composition and content used for its preparation are as follows: Ultraviolet absorber I: 23 - 31% Ultraviolet absorber II: 8 - 16% Hindered amine light stabilizer I: 10 - 20% Hindered amine light stabilizer II: 20 - 30% Phenolic antioxidant: 8% Phosphite antioxidant: 13%.

5. A light-stable composition according to claim 4, wherein Calculated by mass percentage, the raw material composition and content used in its preparation are as follows: Ultraviolet absorber I: 31% Ultraviolet absorber II: 8% Hindered amine light stabilizer I: 20% Hindered amine light stabilizer II: 20% Phenolic antioxidant: 8% Phosphite antioxidant: 13%.

6. Among them, ultraviolet absorber I is Tinuvin 360 and Tinuvin 312, compounded according to the mass ratio of Tinuvin 360: Tinuvin 312 of 23:8; The formamidine ultraviolet absorber of ultraviolet absorber II is UV - 1; Hindered amine light stabilizer I is Tinuvin292; Hindered amine light stabilizer II is Tinuvin 119; Phenolic antioxidant is ADK STAB AO - 50; Phosphite antioxidant is Ultranox 626.

7. A method for preparing a light-stable composition according to any one of claims 1-5, characterized in that, The steps are as follows: First, mix the raw materials in powder state in the light stabilizer composition evenly to obtain a mixed powder raw material; Then, mix the raw materials in liquid state in the light stabilizer composition evenly to obtain a mixed liquid raw material; Finally, heat the above - mentioned mixed liquid raw material to 40 - 60 °C, then evenly spray it on the above - obtained mixed powder raw material and stir evenly to obtain a light - stable composition.

8. As described in claim 1, a light - stable composition is directly used as an additive in the raw materials for preparing products that are long - term exposed to an ultraviolet environment, and its addition amount is 0.2 - 0.8 wt%.

9. When a light - stable composition as described in claim 7 is used as an additive in the raw materials for preparing products that are long - term exposed to an ultraviolet environment, its addition amount is 0.4 - 0.8 wt%.

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