Anti-aging plastic using nano-structure inorganic coloring filler and application of anti-aging plastic

Abstract

The invention discloses anti-aging plastic using nano-structure inorganic coloring filler and application of the anti-aging plastic, and relates to the technical field of plastic materials. According to the invention, polypropylene is adopted as a main material, and the color master batch is added as a coloring filler, so that the public seat with bright color is manufactured, and the color master batch adopts various types of nano-structure inorganic coloring fillers; according to the coloring mechanism, the final color development effect is affected mainly through the refractive index difference between pigment and a dispersion medium, the particle size and particle size distribution and cooperation between main materials, and due to the fact that most public chairs are located in the outdoor environment, the color development effect becomes poor after the public chairs are aged. Therefore, other types of auxiliary materials are added subsequently and are matched with the nano-structure inorganic coloring filler, so that the color development effect of the public seat is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic materials, in particular to an anti-aging plastic using a nanostructured inorganic coloring filler and application thereof. Background Art

[0002] As one of the five major general-purpose plastics, polypropylene (PP) occupies an important position in the plastics industry. Its output is only lower than polyethylene (PE) and polyvinyl chloride (PVC), ranking third. It has many advantages, a wide range of sources and affordable prices. It has excellent mechanical properties, good electrical insulation, excellent stress cracking resistance and chemical stability, and is very convenient in molding and processing. Various products can be efficiently manufactured using various processes such as injection, extrusion, and blow molding. At the same time, polypropylene has a wide range of applications, including automobiles, aerospace, electronics, packaging, building materials, and medical devices. However, with the development of technology and the diversification of market demand, polypropylene also faces some challenges.

[0003] Polypropylene itself has some inherent shortcomings. The side methyl groups on its molecular chain links reduce the flexibility of the chain, and the spherulite particles are large, which will cause the material to become brittle, and the impact resistance and high-temperature rigidity are insufficient; and it is a non-polar polymer, and it performs poorly in terms of dyeability, adhesion, antistatic properties and compatibility with inorganic materials; its shrinkage rate during processing and molding is large, which makes the dimensional stability of the product low; in addition, its aging and degradation resistance is poor. These problems seriously limit the application of polypropylene under higher performance requirements, especially when it is used as a raw material or special material for some high-end products, its comprehensive performance cannot meet the requirements. Therefore, it is necessary to seek new modification technologies and approaches to improve the performance of polypropylene so that it can better adapt to the ever-expanding application fields and higher performance requirements. This application aims to explore effective modification methods for these shortcomings of polypropylene to improve its UV resistance and flame retardancy, expand its scope of application, and promote the development of polypropylene to higher performance fields such as engineering plastics and functional materials. Summary of the invention

[0004] The object of the present invention is to provide an anti-aging plastic using a nanostructured inorganic coloring filler and its application, so as to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The invention discloses an anti-aging plastic using a nanostructured inorganic coloring filler. The anti-aging plastic comprises the following components by mass ratio: 0.5-2.5% lubricant, 10-20% compatibilizer, 15-20% glass fiber, 0.8-1.2% macromolecular flame retardant, 2-3% inorganic filler, 3-5% masterbatch, and the balance is polypropylene.

[0007] As an optimization, the macromolecular flame retardant is prepared by introducing an azide group into diphenylphosphinoyl chloride to obtain a modified flame retardant, and then introducing an alkynyl group required for a click reaction into the hydroxyl group at the 4th position of 2,4-dihydroxybenzophenone through a substitution reaction to obtain an alkynyl ultraviolet absorber, and finally the modified flame retardant and the alkynyl ultraviolet absorber are click-bonded through a click reaction to obtain a macromolecular flame retardant.

[0008] As an optimization, the masterbatch uses one or a combination of In-B-603-T-SF nanostructured inorganic coloring filler, In-Y-601-T-SF nanostructured inorganic coloring filler and In-MR-601-T-SF nanostructured inorganic coloring filler.

[0009] As an optimization, the lubricant is calcium stearate.

[0010] As an optimization, the compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3 to 3.5.

[0011] As an optimization, the inorganic filler is nano titanium dioxide.

[0012] A method for preparing an anti-aging plastic using a nanostructured inorganic coloring filler comprises the following steps:

[0013] S1. At a temperature of 25 to 35° C. and a nitrogen atmosphere, the modified flame retardant, the alkynyl ultraviolet absorber and cuprous bromide are added to tetrahydrofuran (20 to 25 times the mass of the modified flame retardant) in a mass ratio of 1:1.1 to 1.3:0.25 to 0.3 in sequence. After returning to room temperature, pentamethyldiethylenetriamine (0.3 to 0.5 times the mass of the modified flame retardant) is added. After reacting for 10 to 12 hours, methanol (3 to 5 times the mass of tetrahydrofuran) is added, and the precipitate is allowed to stand and precipitate. The precipitate is filtered out, dissolved with tetrahydrofuran and passed through a column. After removing cuprous bromide, the precipitate is precipitated with methanol again, and the precipitate is vacuum dried to obtain a macromolecular flame retardant.

[0014] S2, weighing the raw materials according to the above mass ratio, adding them into a mixer and stirring them at a speed of 400-500 r / min for 15-20 min, and then melting, blending, extruding and pelletizing them through a twin-screw machine to obtain an anti-aging plastic;

[0015] As an optimization, the modified flame retardant includes the following preparation steps: diphenylphosphine chloride, sodium azide and tetra-n-octylammonium bromide are added to tetrahydrofuran (20 to 25 times the mass of diphenylphosphine chloride) in sequence according to a mass ratio of 1:3.5 to 3.8:0.8 to 1.2, and then stirred for reaction at a temperature of 0 to 5°C for 2 to 3 hours, and then heated to 25 to 35°C for further reaction for 3 to 4 hours. After the reaction is completed, the mixture is allowed to stand for stratification, and the upper layer liquid is transferred to a methanol solution 2 to 3 times the volume of the upper layer liquid. After standing and filtering, the mixture is washed with methanol and deionized water for 3 to 5 times respectively, and then vacuum dried to obtain the modified flame retardant.

[0016] As an optimization, the alkynyl ultraviolet absorber includes the following preparation steps: according to a mass ratio of 1:1.2 to 1.4, 2,4-dihydroxybenzophenone and potassium carbonate are added to acetone with a mass of 12 to 14 times that of 2,4-dihydroxybenzophenone, and then 3-bromopropyne with a mass of 0.45 to 0.55 times that of 2,4-dihydroxybenzophenone is added, and reflux reaction is carried out for 16 to 18 hours. After the reaction is completed, suction filtration and rotary evaporation are performed, and then column chromatography separation and purification are performed to remove the solvent to obtain a light yellow solid, and then the light yellow solid is vacuum dried to obtain an alkynyl ultraviolet absorber.

[0017] Application of any of the above-mentioned anti-aging plastics using nanostructured inorganic coloring fillers in public seats.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] The present application adopts polypropylene as the main material, adds masterbatch as the coloring filler, and adopts the coloring filler as a nanostructured inorganic filler. The coloring mechanism is mainly through the difference in refractive index between the pigment and the dispersion medium, the particle size and particle size distribution, and the coordination between the main materials to affect the final coloring effect. Aging of the main material will lead to a deterioration in the coloring effect. Therefore, the present application also adds a macromolecular flame retardant and cooperates with the nanostructured inorganic coloring filler to improve the UV resistance and flame retardancy of the final polypropylene material, thereby improving the final coloring effect and the mechanical properties of the main material. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] S1, according to a mass ratio of 1:1.2, 2,4-dihydroxybenzophenone and potassium carbonate were added to acetone with a mass of 12 times that of 2,4-dihydroxybenzophenone, and then 3-bromopropyne with a mass of 0.45 times that of 2,4-dihydroxybenzophenone was added, and the reaction was refluxed for 16 hours. After the reaction was completed, suction was filtered and rotary evaporated, and then the reaction was separated and purified by column chromatography to remove the solvent to obtain a light yellow solid, and then the light yellow solid was vacuum dried to obtain an alkynyl ultraviolet absorber;

[0023] S2. According to the mass ratio of 1:3.5:0.8, diphenylphosphinyl chloride, sodium azide and tetra-n-octylammonium bromide were added to tetrahydrofuran (20 times the mass of diphenylphosphinyl chloride) in sequence, and then stirred at 0°C for 2h, and then heated to 25°C for 3h. After the reaction was completed, the upper layer was allowed to stand for stratification, and the upper layer liquid was transferred to a methanol solution with a volume of 2 times that of the upper layer liquid. After standing and filtering, the upper layer liquid was washed with methanol and deionized water for 3 times respectively, and then vacuum dried to obtain a modified flame retardant;

[0024] S3. At a temperature of 25°C and a nitrogen atmosphere, add the modified flame retardant, alkynyl ultraviolet absorber and cuprous bromide in a mass ratio of 1:1.1:0.25 to tetrahydrofuran (20 times the mass of the modified flame retardant) in sequence, return to room temperature, add pentamethyldiethylenetriamine (0.3 times the mass of the modified flame retardant), react for 10 hours, add methanol (3 times the mass of tetrahydrofuran), let stand and precipitate, filter out the precipitate, dissolve it with tetrahydrofuran and pass it through a column, remove cuprous bromide, precipitate it with methanol again, and vacuum dry the precipitate to obtain a macromolecular flame retardant;

[0025] S4. Weigh 0.5% calcium stearate, 10% compatibilizer, 15% glass fiber, 0.8% macromolecular flame retardant, 2% nano titanium dioxide, 3% masterbatch and the balance polypropylene according to the mass ratio, add them into a mixer and stir at a speed of 400r / min for 15 minutes, then melt-blend, extrude and pelletize through a twin-screw machine to obtain an anti-aging plastic; the compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3.

[0026] Example 2

[0027] S1, according to the mass ratio of 1:1.3, 2,4-dihydroxybenzophenone and potassium carbonate were added to acetone with a mass of 13 times that of 2,4-dihydroxybenzophenone, and then 3-bromopropyne with a mass of 0.5 times that of 2,4-dihydroxybenzophenone was added, and the reaction was refluxed for 17 hours. After the reaction was completed, suction was filtered and rotary evaporated, and then the solvent was removed by column chromatography for purification to obtain a light yellow solid, and then the light yellow solid was vacuum dried to obtain an alkynyl ultraviolet absorber;

[0028] S2. Diphenylphosphinyl chloride, sodium azide and tetra-n-octylammonium bromide were added to tetrahydrofuran (22.5 times the mass of diphenylphosphinyl chloride) in sequence according to a mass ratio of 1:3.65:1, and then stirred for reaction at a temperature of 2.5°C for 2.5 hours, and then heated to 30°C for further reaction for 3.5 hours. After the reaction was completed, the upper layer was allowed to stand for stratification, and the upper layer liquid was transferred to a methanol solution (2.5 times the volume of the upper layer liquid), and after standing and filtering, it was washed with methanol and deionized water for 4 times respectively, and then vacuum dried to obtain a modified flame retardant;

[0029] S3. At a temperature of 30°C and a nitrogen atmosphere, the modified flame retardant, alkynyl ultraviolet absorber and cuprous bromide were added to tetrahydrofuran (22.5 times the mass of the modified flame retardant) in a mass ratio of 1:1.2:0.275 in sequence. After returning to room temperature, pentamethyldiethylenetriamine (0.4 times the mass of the modified flame retardant) was added. After reacting for 11 hours, methanol (4 times the mass of tetrahydrofuran) was added, and the mixture was allowed to stand for precipitation. The precipitate was filtered out, dissolved in tetrahydrofuran and passed through a column. After removing cuprous bromide, the mixture was precipitated again with methanol, and the precipitate was vacuum dried to obtain a macromolecular flame retardant.

[0030] S4. Weigh 1% calcium stearate, 15% compatibilizer, 18% glass fiber, 1% macromolecular flame retardant, 3% nano titanium dioxide, 4% masterbatch and the balance polypropylene according to the mass ratio, add them into a mixer and stir at a speed of 450r / min for 20 minutes, then melt-blend, extrude and pelletize through a twin-screw machine to obtain an anti-aging plastic; the compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3.2.

[0031] Example 3

[0032] S1, according to the mass ratio of 1:1.4, 2,4-dihydroxybenzophenone and potassium carbonate were added to acetone with a mass of 14 times that of 2,4-dihydroxybenzophenone, and then 3-bromopropyne with a mass of 0.55 times that of 2,4-dihydroxybenzophenone was added, and the reaction was refluxed for 18 hours. After the reaction was completed, suction was filtered and rotary evaporated, and then the solvent was removed by column chromatography for purification to obtain a light yellow solid, and then the light yellow solid was vacuum dried to obtain an alkynyl ultraviolet absorber;

[0033] S2. According to the mass ratio of 1:3.8:1.2, diphenylphosphinyl chloride, sodium azide and tetra-n-octylammonium bromide were added to tetrahydrofuran (25 times the mass of diphenylphosphinyl chloride) in sequence, and then stirred at 5°C for 3 hours, and then heated to 35°C for 4 hours. After the reaction was completed, the upper layer was allowed to stand for stratification, and the upper layer liquid was transferred to a methanol solution 3 times the volume of the upper layer liquid. After standing and filtering, the upper layer liquid was washed with methanol and deionized water for 5 times respectively, and then vacuum dried to obtain a modified flame retardant;

[0034] S3. At a temperature of 35°C and a nitrogen atmosphere, the modified flame retardant, the alkynyl ultraviolet absorber and cuprous bromide were added to tetrahydrofuran (25 times the mass of the modified flame retardant) in a mass ratio of 1:1.3:0.3 in sequence. After returning to room temperature, pentamethyldiethylenetriamine (0.5 times the mass of the modified flame retardant) was added. After reacting for 12 hours, methanol (5 times the mass of the tetrahydrofuran) was added, and the mixture was allowed to stand for precipitation. The precipitate was filtered out, dissolved in tetrahydrofuran and passed through a column. After removing cuprous bromide, the mixture was precipitated again with methanol, and the precipitate was vacuum dried to obtain a macromolecular flame retardant.

[0035] S4. Weigh 2.5% calcium stearate, 20% compatibilizer, 20% glass fiber, 1.2% macromolecular flame retardant, 3% nano titanium dioxide, 5% masterbatch and the balance polypropylene according to the mass ratio, add them into a mixer and stir at a speed of 500r / min for 20 minutes, then melt-blend, extrude and pelletize through a twin-screw machine to obtain an anti-aging plastic; the compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3.5.

[0036] Example 4

[0037] The only difference from Example 2 is step S4: 1% calcium stearate, 15% compatibilizer, 18% glass fiber, 0.5% 2,4-dihydroxybenzophenone, 3% nano titanium dioxide, 4% masterbatch, and the balance polypropylene are weighed according to the mass ratio, and added to a mixer and stirred at a speed of 450r / min for 20min, and then melt-blended, extruded, and pelletized by a twin-screw machine to obtain an anti-aging plastic; the compatibilizer is prepared by mixing polydodecyl hydroxystearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3.2.

[0038] Example 5

[0039] The only difference from Example 2 is step S4: 1% calcium stearate, 15% compatibilizer, 18% glass fiber, 0.5% diphenylphosphine chloride, 3% nano titanium dioxide, 4% masterbatch, and the balance polypropylene are weighed according to the mass ratio, and added to a mixer and stirred at a speed of 450r / min for 20min, and then melt-blended, extruded, and pelletized by a twin-screw machine to obtain an anti-aging plastic; the compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3.2.

[0040] Example 6

[0041] The only difference from Example 2 is step S4: 1% calcium stearate, 15% compatibilizer, 18% glass fiber, 0.5% diphenylphosphinoyl chloride, 0.5% 2,4-dihydroxybenzophenone, 3% nano titanium dioxide, 4% masterbatch, and the balance polypropylene are weighed according to the mass ratio, and added to a mixer and stirred at a speed of 450r / min for 20min, and then melt-blended, extruded, and pelletized by a twin-screw machine to obtain an anti-aging plastic; the compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3.2.

[0042] Mechanical properties and aging resistance tests:

[0043] The anti-aging plastics prepared in Examples 1 to 6 were sampled by an injection molding machine to obtain 1A-type specimens. The tensile strength of the composite material specimens was measured by an electronic universal testing machine. The tensile speed was set to 50 mm / min, and the initial tensile strength was calculated.

[0044] The aging resistance test is carried out simultaneously with the mechanical properties: first, a xenon lamp is used to simulate the entire spectrum of sunlight, and the sample is placed in a xenon lamp accelerated aging test chamber. The aging time is 360 hours. The experimental conditions are air atmosphere, temperature 65°C, the light source is 25 cm away from the sample, and the radiation intensity is 550W / m2. The tensile strength is tested again and calculated as the tensile strength after aging. The performance retention rate is calculated by the initial tensile strength and the tensile strength after aging; Performance retention rate = tensile strength after aging / initial tensile strength;

[0045] Table 1 Mechanical properties and aging resistance test results

[0046]

[0047]

[0048] From the comparison of the experimental data of Examples 1 to 3 in Table 1, it can be found that the anti-aging plastic prepared by the present invention has good mechanical properties, good performance retention rate and excellent anti-aging performance.

[0049] In Examples 4 and 5, the decrease in tensile strength and property retention is higher, but this combined decrease is expected because the addition of flame retardants and anti-ultraviolet absorbers alone will not necessarily produce a synergistic effect.

[0050] In Example 6, the two are added at the same time, but we can see that there is no obvious improvement. Therefore, when not bonded, the two cannot produce a synergistic effect and cannot achieve the effect of 1+1 greater than 2.

[0051] Flame retardant performance test:

[0052] Flame retardant performance test method: According to ISO2406 standard, test limit oxygen index, sample size 110×10×2mm 3 .

[0053] Similar to the above aging resistance test, the limiting oxygen index is tested again after the aging resistance test, and the flame retardant performance retention rate is calculated by the limiting oxygen index before and after; flame retardant performance retention rate = limiting oxygen index after aging / initial limiting oxygen index; the results are shown in Table 2:

[0054] Table 2 Flame retardant properties and retention test results

[0055]

[0056]

[0057] From the comparison of the experimental data in Examples 1 to 3 in Table 2, it can be found that the anti-aging plastic prepared by the present invention has good flame retardant properties.

[0058] Since flame retardants are added to Examples 5 and 6, their initial flame retardant effects are good, but in the later period, Example 5 clearly shows a trend of decreasing flame retardant performance, mainly due to its significantly poor anti-aging performance. Although Example 6 has declined, the decline is still less due to the addition of anti-ultraviolet absorbers, but the decline is still more obvious compared with Examples 1 to 3.

[0059] It can be seen from the above embodiments that the added macromolecular flame retardant is mainly used to improve the UV resistance and flame retardancy of the polypropylene material; the macromolecular flame retardant uses diphenylphosphinyl chloride as the flame retardant part, and introduces an azide group thereon, and then forms a triazole ring group by click bonding with an alkynyl ultraviolet absorber using an azide group and an alkynyl group. On the one hand, the N element is introduced through the triazole ring group, which can form a synergistic flame retardant with P in the diphenylphosphinyl chloride, thereby improving the flame retardant effect of the final product; on the other hand, the triazole ring group also has the characteristics of high-temperature carbonization and expansion, forming a dense carbon structure protective layer, thereby forming a good mass transfer and heat insulation barrier;

[0060] In addition, 2,4-dihydroxybenzophenone is introduced as a UV absorber in the click bonding process. Traditional 2,4-dihydroxybenzophenone is a UV absorber with good light stabilization effect, but due to its poor compatibility with polypropylene materials, small molecular weight and high volatility, it not only reduces its practical value but also easily pollutes the environment; however, the present application grafts it with diphenylphosphine chloride to finally form a macromolecular flame retardant, which can effectively increase its molecular weight, so as to achieve long-term light stabilization performance, and will not cause poor compatibility problems in the later stage.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An anti-aging plastic using a nanostructured inorganic coloring filler, characterized in that: The anti-aging plastic comprises the following components by weight: 0.5-2.5% lubricant, 10-20% compatibilizer, 15-20% glass fiber, 0.8-1.2% macromolecular flame retardant, 2-3% inorganic filler, 3-5% masterbatch, and the balance is polypropylene.

2. The anti-aging plastic using nanostructured inorganic coloring filler according to claim 1, characterized in that: The macromolecular flame retardant is prepared by introducing an azide group into diphenylphosphinoyl chloride to obtain a modified flame retardant, and then introducing an alkynyl group required for a click reaction into the hydroxyl group at the 4th position of 2,4-dihydroxybenzophenone through a substitution reaction to obtain an alkynyl ultraviolet absorber, and finally the modified flame retardant and the alkynyl ultraviolet absorber are click-bonded through a click reaction to obtain the macromolecular flame retardant.

3. The anti-aging plastic using nanostructured inorganic coloring filler according to claim 1, characterized in that: The masterbatch adopts one or a combination of In-B-603-T-SF nanostructured inorganic coloring filler, In-Y-601-T-SF nanostructured inorganic coloring filler and In-MR-601-T-SF nanostructured inorganic coloring filler.

4. The anti-aging plastic using nanostructured inorganic coloring filler according to claim 1, characterized in that: The lubricant is calcium stearate.

5. The anti-aging plastic using nanostructured inorganic coloring filler according to claim 1, characterized in that: The compatibilizer is prepared by mixing polydodecyl stearate grafted tannic acid and maleic anhydride grafted polypropylene in a mass ratio of 7:3-3.

5.

6. The anti-aging plastic using nanostructured inorganic coloring filler according to claim 1, characterized in that: The inorganic filler is nano titanium dioxide.

7. A method for preparing anti-aging plastics using nanostructured inorganic coloring fillers, characterized in that: The following steps are involved: S1. At a temperature of 25 to 35° C. and a nitrogen atmosphere, the modified flame retardant, the alkynyl ultraviolet absorber and cuprous bromide are added to tetrahydrofuran (20 to 25 times the mass of the modified flame retardant) in a mass ratio of 1:1.1 to 1.3:0.25 to 0.3 in sequence. After returning to room temperature, pentamethyldiethylenetriamine (0.3 to 0.5 times the mass of the modified flame retardant) is added. After reacting for 10 to 12 hours, methanol (3 to 5 times the mass of tetrahydrofuran) is added, and the precipitate is allowed to stand and precipitate. The precipitate is filtered out, dissolved with tetrahydrofuran and passed through a column. After removing cuprous bromide, the precipitate is precipitated with methanol again, and the precipitate is vacuum dried to obtain a macromolecular flame retardant. S2. Weigh the raw materials according to the above mass ratio, add them into a mixer and stir them at a speed of 400-500 r / min for 15-20 min, then use a twin-screw machine to melt-blend, extrude and pelletize to obtain an anti-aging plastic.

8. The method for preparing anti-aging plastics using nanostructured inorganic coloring fillers according to claim 7, characterized in that: The modified flame retardant comprises the following preparation steps: adding diphenylphosphinyl chloride, sodium azide and tetra-n-octylammonium bromide to tetrahydrofuran (20 to 25 times the mass of diphenylphosphinyl chloride) in sequence according to a mass ratio of 1:3.5 to 3.8:0.8 to 1.2, stirring and reacting for 2 to 3 hours at a temperature of 0 to 5°C, heating to 25 to 35°C, and continuing to react for 3 to 4 hours. After the reaction is completed, standing and stratifying, transferring the upper layer liquid to a methanol solution (2 to 3 times the volume of the upper layer liquid), standing and filtering, washing with methanol and deionized water for 3 to 5 times respectively, and then vacuum drying to obtain the modified flame retardant.

9. The method for preparing anti-aging plastics using nanostructured inorganic coloring fillers according to claim 7, characterized in that: The alkynyl ultraviolet absorber comprises the following preparation steps: adding 2,4-dihydroxybenzophenone and potassium carbonate to acetone with a mass ratio of 1:1.2-1.4, then adding 3-bromopropyne with a mass of 0.45-0.55 times that of 2,4-dihydroxybenzophenone, and reflux reaction for 16-18 hours. After the reaction is completed, suction filtration and rotary evaporation are performed, and then column chromatography separation and purification are performed to remove the solvent to obtain a light yellow solid. Then, the light yellow solid is vacuum dried to obtain the alkynyl ultraviolet absorber.

10. Use of the anti-aging plastic using nanostructured inorganic coloring filler as claimed in any one of claims 1 to 6 in public seats.

Images