A modified PP foaming reinforced material and preparation method thereof

Abstract

The present invention relates to a modified PP foaming reinforced material and a preparation method thereof, wherein the modified PP foaming reinforced material is calculated by weight and comprises: 65-85 parts of polypropylene resin, 15-20 parts of polystyrene, 13-26 parts of filling modifier, 6-12 parts of compatibilizer, 1.2-3 parts of foaming agent, 1-2 parts of lubricant, 0.5-1.5 parts of heat stabilizer and 0.3-0.8 parts of light stabilizer. Wherein, the filling modifier is prepared by click chemical reaction of double-bonded yttrium nitride micropowder and bis(thioglycolic acid) glycol ester. The present invention prepares a modified PP foaming reinforced material, which has better strength, toughness, wear resistance and aging resistance than traditional foamed polypropylene materials, further improves the performance of PP foaming materials, makes the product more in line with market demand, and improves its competitiveness.

Description

Technical Field

[0001] The invention relates to the field of foaming materials, and in particular to a modified PP foaming reinforced material and a preparation method thereof. Background Art

[0002] Foam plastics have the advantages of light weight, heat insulation, sound insulation, cushioning, and high specific strength. Therefore, they are widely used in packaging, industry, agriculture, transportation, military industry, aerospace industry, and daily necessities. Since the 1990s, the development of foam plastics in my country has also been very rapid, and the main varieties are polyurethane (PU), polystyrene (PS) and polyolefin foam materials. However, PU will produce isocyanate residues that are harmful to the human body during the foaming process, and it cannot be recycled; while the waste of foamed PS products does not rot and is difficult to recycle, causing "white pollution". In 1991, the European Community formulated a mandatory "packaging rule" and included foamed PS in the "avoid use" range. The United Nations Environmental Protection Organization has decided to stop the production and use of foamed PS worldwide by 2005. At this time, people use foamed polypropylene (PP) with excellent performance and easy recycling to replace other foam materials in many fields.

[0003] Polypropylene foam is a cushioning material with excellent performance. Due to its excellent protection performance on smooth surfaces, it has been widely used in cushioning packaging of furniture, high-end instruments and metal appliances with smooth surfaces. Therefore, the research, development and promotion of polypropylene foaming technology have become the focus of attention of all countries. However, although the existing PP foaming materials on the market have low density, they do not have good physical and mechanical properties. The prepared polypropylene foaming materials have the defects of low strength, poor toughness and poor aging resistance. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a modified PP foam reinforced material and a preparation method thereof.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] In a first aspect, the present invention provides a modified PP foam reinforced material, calculated by weight, comprising:

[0007] 65-85 parts of polypropylene resin, 15-20 parts of polystyrene, 13-26 parts of filler modifier, 6-12 parts of compatibilizer, 1.2-3 parts of foaming agent, 1-2 parts of lubricant, 0.5-1.5 parts of heat stabilizer and 0.3-0.8 parts of light stabilizer.

[0008] Preferably, the polypropylene resin is one or more of PPB-M09, PPB-M03, PPB-M02, and PPB-M04. More preferably, it is PPB-M09 with a density of 0.91 g / cm 3 , the melt index is 5g / 10min (230℃, 2.16kg).

[0009] Preferably, the polystyrene model is one or more of GPPS-525, GPPS-500N, GPPS-500T, and GPPS-535N. More preferably, it is GPPS-525 with a density of 1.06 g / cm 3 , the melt index is 18g / 10min (230℃, 2.16kg).

[0010] Preferably, the filling modifier is prepared by a click chemistry reaction of double-bonded yttrium nitride micropowder and ethylene glycol bis(thioglycolate).

[0011] Preferably, the compatibilizer is a styrene / butadiene / styrene block copolymer with a density of 1.02 g / cm 3 , the melt index is 10g / 10min (200℃, 5kg).

[0012] Preferably, the foaming agent is any one of AC foaming agent, ADC foaming agent and OBSH foaming agent, more preferably AC foaming agent.

[0013] Preferably, the lubricant is one or more combinations of calcium stearate, zinc stearate, magnesium stearate and stearic acid.

[0014] Preferably, the heat stabilizer is any one of barium zinc stabilizer BZ-610B, calcium zinc stabilizer AW-328, and potassium zinc stabilizer YA-230, and more preferably calcium zinc stabilizer AW-328.

[0015] Preferably, the light stabilizer is any one of UV-234, UV-944, UV-3346 and UV-531, more preferably UV-531.

[0016] Preferably, the preparation method of the filling modifier comprises:

[0017] S1, double bonded yttrium nitride powder:

[0018] Yttrium nitride micropowder and anhydrous ethanol are mixed, silane coupling agent KH-570 is added dropwise, the temperature is raised to reflux and stirred, and after the treatment is completed, the precipitate is collected by centrifugation, washed and dried to obtain double-bonded yttrium nitride micropowder (D-NY);

[0019] S2. Click reaction preparation:

[0020] Ethylene glycol bis(thioglycolate) and anhydrous ethanol are mixed and stirred thoroughly, then double-bonded yttrium nitride micropowder is added, ultrasonically mixed, and then a photoinitiator is added, stirred to react under ultraviolet light, and the precipitate is collected by centrifugation, washed and dried to obtain a filling modifier.

[0021] Preferably, in S1, the particle size of the yttrium nitride powder is 150±10 μm, and the purity is higher than 99%.

[0022] Preferably, in S1, the mass volume ratio of yttrium nitride powder, silane coupling agent KH-570 and anhydrous ethanol is 1g:(0.3-0.5)g:(10-20)mL.

[0023] Preferably, in S1, the reaction temperature is 70-80°C and the reaction time is 3-8h.

[0024] Preferably, in S2, the mass volume ratio of the double-bonded yttrium nitride powder, ethylene glycol bis(thioglycolate) and anhydrous ethanol is 1 g:(0.42-0.84) g:(15-25) mL.

[0025] Preferably, in S2, the photoinitiator is one of dimethyl benzoate, hydroquinone, diisopropylbenzene peroxide and 2,2-dihydroxymethylpropionic acid.

[0026] Preferably, in S2, the amount of photoinitiator added is 3%-8% of the mass of ethylene glycol bis(thioglycolate).

[0027] Preferably, in S2, the power of the ultraviolet light is 20-50W, and the wavelength is 260-360nm, preferably 354nm.

[0028] Preferably, in S2, the ultraviolet light irradiation time is 1-2 h, and the stirring speed is 150-250 r / min.

[0029] In a second aspect, the present invention provides a method for preparing a modified PP foam reinforced material, comprising the following steps:

[0030] Step 1, mixing polypropylene resin, polystyrene, filler modifier and compatibilizer in a mixer, heating to 180-210° C., stirring and mixing evenly at a stirring speed of 20-80 r / min to obtain a first material;

[0031] Step 2, continue to add the foaming agent, lubricant, heat stabilizer and light stabilizer to the first material, and mix them at the temperature and stirring speed of step 1 until they are uniform, to obtain the second material;

[0032] Step 3, transfer the second material to a foaming machine, set the pressure to 10-15 MPa, the temperature to 200-220° C., the foaming time to 8-15 min, and after the foaming process is completed, cool to room temperature to obtain the desired material.

[0033] The beneficial effects of the present invention are:

[0034] 1. The present invention prepares a modified PP foam reinforced material, which has better strength, toughness, wear resistance and aging resistance than traditional foamed polypropylene materials, further improves the performance of PP foam materials, makes the product more in line with market demand, and improves its competitiveness.

[0035] 2. The present invention adds polystyrene as an auxiliary raw material on the basis of polypropylene resin as the main raw material, which enhances the mechanical properties of the material to a certain extent; then a compatibilizer is added to improve the compatibility between resins; and the addition of a filling modifier is not only used as a filler, but also as a reinforcing modifier, which enhances the strength, toughness and aging resistance of the material; in addition, additional additives such as lubricants, light and heat stabilizers are also added.

[0036] 3. The filling modifier used in the present invention is prepared by using double-bonded yttrium nitride micropowder and bis(thioglycolic acid) glycol ester as raw materials through a click chemical reaction. The double-bonded yttrium nitride micropowder is obtained by treating yttrium nitride micropowder with silane, so that a large number of carbon-carbon double bond groups are attached to the surface of the yttrium nitride micropowder, and after combining with bis(thioglycolic acid) glycol ester containing a double mercapto group, the double bond-thiol group can undergo a click chemical reaction under ultraviolet initiation to generate a thioether bond fixed on the surface of the micropowder, thereby obtaining a filling modifier of an organic compound-coated inorganic material. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0038] Figure 1 It is a schematic diagram of the infrared spectrum (FTIR) of the filling modifier prepared in Example 1 and Comparative Example 3 of the present invention. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0040] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0041] The present invention will be further described below in conjunction with the following examples. Example 1

[0042] A modified PP foaming reinforced material, calculated by weight, comprising:

[0043] 75 parts of polypropylene resin, 18 parts of polystyrene, 20 parts of filler modifier, 8 parts of compatibilizer, 2.4 parts of foaming agent, 1.5 parts of lubricant, 1 part of heat stabilizer and 1 part of light stabilizer.

[0044] Among them, the model of polypropylene resin is PPB-M09, and the density is 0.91g / cm 3 , melt index is 5g / 10min (230℃, 2.16kg); polystyrene model is GPPS-525, density is 1.06g / cm 3 , melt index is 18g / 10min (230℃, 2.16kg); the compatibilizer is styrene / butadiene / styrene block copolymer, density is 1.02g / cm 3 , melt index is 10g / 10min (200℃, 5kg); foaming agent is AC foaming agent; lubricant is calcium stearate; heat stabilizer is calcium zinc stabilizer AW-328; light stabilizer is UV-531.

[0045] The preparation method of the filling modifier comprises:

[0046] S1. Mix yttrium nitride powder (particle size of 150±10μm, purity higher than 99%, manufacturer: Shanghai Yingfeng Ruihuang Metal Materials Co., Ltd.) and anhydrous ethanol, add silane coupling agent KH-570 dropwise, the mass volume ratio of yttrium nitride powder, silane coupling agent KH-570 and anhydrous ethanol is 1g:0.4g:15mL, heat to 75°C, reflux and stir for 5h, after the treatment, collect the precipitate by centrifugation, wash it three times with water and then dry it in vacuum to obtain double-bonded yttrium nitride powder (D-NY);

[0047] S2. Mix ethylene glycol bis(thioglycolate) and anhydrous ethanol, stir well, add double-bonded yttrium nitride powder (D-NY), the mass volume ratio of double-bonded yttrium nitride powder, ethylene glycol bis(thioglycolate) and anhydrous ethanol is 1g:0.63g:20mL, mix evenly by ultrasonication, then add dimethyl benzoate in an amount of 5% of the mass of ethylene glycol bis(thioglycolate), stir and react under ultraviolet light, the power of ultraviolet light is 35W, the wavelength is 354nm, the irradiation time is 1.5h, the stirring speed is 200r / min, after the reaction is completed, collect the precipitate by centrifugation, wash it three times with alcohol, and dry it in vacuum to obtain modified yttrium nitride powder (ES-NY), i.e., filling modifier.

[0048] The preparation method of the modified PP foam reinforced material comprises the following steps:

[0049] Step 1, polypropylene resin, polystyrene, filler modifier and compatibilizer are mixed in a mixer, heated to 195° C., and stirred to mix evenly at a stirring speed of 60 r / min to obtain a first material;

[0050] Step 2, continue to add the foaming agent, lubricant, heat stabilizer and light stabilizer to the first material, and mix them at the temperature and stirring speed of step 1 until they are uniform, to obtain the second material;

[0051] Step 3, transfer the second material to a foaming machine, set the pressure to 12.5 MPa, the temperature to 210° C., the foaming time to 12 min, and after the foaming process is completed, cool to room temperature to obtain the desired material. Example 2

[0052] A modified PP foam reinforced material, which is different from Example 1 only in that the ingredients in the formula are slightly different, calculated by weight, including:

[0053] 65 parts of polypropylene resin, 15 parts of polystyrene, 13 parts of filler modifier, 6 parts of compatibilizer, 1.2 parts of foaming agent, 1 part of lubricant, 0.5 parts of heat stabilizer and 0.3 parts of light stabilizer.

[0054] The model of the polypropylene resin is PPB-M03, the model of the polystyrene is GPPS-500N, the filler modifier is the same as that in Example 1, and the compatibilizer is a styrene / butadiene / styrene block copolymer with a density of 1.02 g / cm 3 , the melt index is 10g / 10min (200℃, 5kg), the foaming agent is AC foaming agent, the lubricant is magnesium stearate, the heat stabilizer is barium zinc stabilizer BZ-610B, and the light stabilizer is UV-234.

[0055] The preparation method of the modified PP foam reinforced material comprises the following steps:

[0056] Step 1, mixing polypropylene resin, polystyrene, filler modifier and compatibilizer in a mixer, heating to 180° C., stirring and mixing evenly at a stirring speed of 20 r / min to obtain a first material;

[0057] Step 2, continue to add the foaming agent, lubricant, heat stabilizer and light stabilizer to the first material, and mix them at the temperature and stirring speed of step 1 until they are uniform, to obtain the second material;

[0058] Step 3, transfer the second material to a foaming machine, set the pressure to 10 MPa, the temperature to 200° C., the foaming time to 8 min, and after the foaming process is completed, cool to room temperature to obtain the desired material. Example 3

[0059] A modified PP foam reinforced material, which is different from Example 1 only in that the ingredients in the formula are slightly different, calculated by weight, including:

[0060] 85 parts of polypropylene resin, 20 parts of polystyrene, 26 parts of filler modifier, 12 parts of compatibilizer, 3 parts of foaming agent, 2 parts of lubricant, 1.5 parts of heat stabilizer and 0.8 parts of light stabilizer.

[0061] The model of the polypropylene resin is PPB-M02, the model of the polystyrene is GPPS-500T, the filler modifier is the same as that in Example 1, and the compatibilizer is a styrene / butadiene / styrene block copolymer with a density of 1.02 g / cm 3 , the melt index is 10g / 10min (200℃, 5kg), the foaming agent is OBSH foaming agent, the lubricant is stearic acid, the heat stabilizer is potassium zinc stabilizer YA-230, and the light stabilizer is UV-944.

[0062] The preparation method of the modified PP foam reinforced material comprises the following steps:

[0063] Step 1, mixing polypropylene resin, polystyrene, filler modifier and compatibilizer in a mixer, heating to 210° C., stirring and mixing evenly at a stirring speed of 80 r / min to obtain a first material;

[0064] Step 2, continue to add the foaming agent, lubricant, heat stabilizer and light stabilizer to the first material, and mix them at the temperature and stirring speed of step 1 until they are uniform, to obtain the second material;

[0065] Step 3, transfer the second material to a foaming machine, set the pressure to 15 MPa, the temperature to 220° C., the foaming time to 15 min, and after the foaming process is completed, cool to room temperature to obtain the desired material. Example 4

[0066] A modified PP foaming reinforced material is different from Example 1 only in that the preparation method of the filling modifier in the formula is different, and the preparation method of the filling modifier includes:

[0067] S1. Mix yttrium nitride powder with a particle size of 150±10μm and a purity higher than 99% with anhydrous ethanol, add silane coupling agent KH-570 dropwise, the mass volume ratio of yttrium nitride powder, silane coupling agent KH-570 and anhydrous ethanol is 1g:0.3g:10mL, heat to 70°C, reflux and stir for 3h, after the treatment, collect the precipitate by centrifugation, wash it three times with water and then dry it in vacuum to obtain double-bonded yttrium nitride powder (D-NY);

[0068] S2. Mix ethylene glycol bis(thioglycolate) and anhydrous ethanol, stir well, add double-bonded yttrium nitride powder (D-NY), the mass volume ratio of double-bonded yttrium nitride powder, ethylene glycol bis(thioglycolate) and anhydrous ethanol is 1g:0.42g:15mL, mix evenly by ultrasonication, then add hydroquinone in an amount of 3% of the mass of ethylene glycol bis(thioglycolate), stir and react under ultraviolet light, the power of ultraviolet light is 20W, the wavelength is 260nm, the irradiation time is 1h, the stirring speed is 150r / min, after the reaction is completed, collect the precipitate by centrifugation, wash it three times with alcohol, and dry it in vacuum to obtain modified yttrium nitride powder (ES-NY), i.e., filling modifier. Example 5

[0069] A modified PP foaming reinforced material is different from Example 1 only in that the preparation method of the filling modifier in the formula is different, and the preparation method of the filling modifier includes:

[0070] S1. Mix yttrium nitride powder with a particle size of 150±10μm and a purity higher than 99% with anhydrous ethanol, add silane coupling agent KH-570 dropwise, the mass volume ratio of yttrium nitride powder, silane coupling agent KH-570 and anhydrous ethanol is 1g:0.5g:20mL, heat to 80°C, reflux and stir for 8h, after the treatment, collect the precipitate by centrifugation, wash it three times with water and then dry it in vacuum to obtain double-bonded yttrium nitride powder (D-NY);

[0071] S2. Mix ethylene glycol bis(thioglycolate) and anhydrous ethanol, stir well, add double-bonded yttrium nitride powder (D-NY), the mass volume ratio of double-bonded yttrium nitride powder, ethylene glycol bis(thioglycolate) and anhydrous ethanol is 1g:0.84g:25mL, mix evenly by ultrasonic, then add 2,2-dihydroxymethylpropionic acid in an amount of 8% of the mass of ethylene glycol bis(thioglycolate), stir and react under ultraviolet light, the power of ultraviolet light is 50W, the wavelength is 360nm, the irradiation time is 2h, the stirring speed is 250r / min, after the reaction is completed, collect the precipitate by centrifugation, wash it three times with alcohol, and dry it in vacuum to obtain modified yttrium nitride powder (ES-NY), i.e., filling modifier.

[0072] Comparative Example 1

[0073] A modified PP foam reinforced material is different from Example 1 only in that the filler modifier in the formula is different, and the filler modifier in this comparative example is yttrium nitride powder (NY). The preparation method of the modified PP foam reinforced material is the same as that of Example 1.

[0074] Comparative Example 2

[0075] A modified PP foam reinforced material, which is different from Example 1 only in that the filling modifier in the formula is different, and the filling modifier in this comparative example is double-bonded yttrium nitride micropowder (D-NY), and the preparation method is the same as step S1 of Example 1. The preparation method of the modified PP foam reinforced material is the same as that of Example 1.

[0076] Comparative Example 3

[0077] A modified PP foam reinforced material, which is different from Example 1 only in that the filling modifier in the formula is different, and the filling modifier in this comparative example is a mixture of yttrium nitride powder (NY) and ethylene glycol bis(thioglycolate), and the mass ratio of yttrium nitride powder (NY) to ethylene glycol bis(thioglycolate) is 1:0.63. The preparation method of the modified PP foam reinforced material is the same as that of Example 1.

[0078] The present invention performs infrared spectrum measurement on the filling modifiers prepared in Example 1 and Comparative Example 3. Figure 1 As shown, from Figure 1It can be seen that the characteristic absorption peak of thiol (-SH) is 2660 cm -1 The characteristic absorption peak of sulfide (CSC) is 650 cm -1 The filler modifier prepared in Example 1 has a -1 There is no absorption peak at 650cm -1 There is an obvious absorption peak at , which can prove that the double bond-thiol group in Example 1 of the present invention has undergone a click chemistry reaction under ultraviolet initiation, and the thiol group has participated in the reaction to form a thioether group.

[0079] Experimental testing

[0080] The modified PP foam reinforced materials prepared in Example 1 and Comparative Examples 1-3 were tested and compared in terms of performance. The tensile strength test was based on GB / T 1040.1-2006; the bending strength test was based on GB / T 9341-2008; the impact strength test was based on GB / T 1843-2008; the hardness test was based on Rockwell hardness (HC); the aging test was based on the method of GB / T16422.2-2014, and the exposure cycle aging treatment was carried out for 200 hours according to the sequence number 1 of the method A cycle, and the change rate of tensile strength was tested. The test results are shown in Table 1:

[0081] Table 1 Comparison of properties of different modified PP foam reinforced materials

[0082] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength (MPa) 32.7 21.7 25.4 27.6 Bending strength (MPa) 53.4 42.5 48.6 46.2 <![CDATA[Izod impact strength (kJ / m 2 ).]]> 6.2 3.3 4.1 3.8 Hardness (HC) 82 73 80 76 Tensile strength retention after aging (%) 91.5 78.2 80.5 85.2

[0083] It can be seen from Table 1 that the modified PP foam reinforced material prepared in Example 1 of the present invention not only has higher tensile strength, bending strength and impact strength, but also has better hardness and aging resistance; the overall performance of Comparative Example 1 is the worst, while the strength of Comparative Example 3 is slightly worse than that of Comparative Example 2, but the aging resistance is better. However, overall, the performance of the modified PP foam reinforced material prepared in Example 1 of the present invention is the best, and the product can better meet market demand.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A modified polypropylene foam reinforced material, characterized in that: Calculated by weight, including: 65-85 parts of polypropylene resin, 15-20 parts of polystyrene, 13-26 parts of filler modifier, 6-12 parts of compatibilizer, 1.2-3 parts of foaming agent, 1-2 parts of lubricant, 0.5-1.5 parts of heat stabilizer and 0.3-0.8 parts of light stabilizer; The filling modifier is prepared by a click chemistry reaction between double-bonded yttrium nitride micropowder and ethylene glycol bis(thioglycolate).

2. A modified polypropylene foam reinforced material according to claim 1, characterized in that: The model of the polypropylene resin is one or a combination of PPB-M09, PPB-M03, PPB-M02, and PPB-M04.

3. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The model of the polystyrene is one or a combination of GPPS-525, GPPS-500N, GPPS-500T, and GPPS-535N.

4. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The compatibilizer is a styrene / butadiene / styrene block copolymer with a density of 1.02 g / cm 3 , the melt index is 10g / 10min at 200℃ and 5kg.

5. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The foaming agent is any one of AC foaming agent, ADC foaming agent and OBSH foaming agent.

6. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The lubricant is one or more combinations of calcium stearate, zinc stearate, magnesium stearate and stearic acid.

7. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The heat stabilizer is any one of barium zinc stabilizer BZ-610B, calcium zinc stabilizer AW-328, and potassium zinc stabilizer YA-230.

8. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The light stabilizer is any one of UV-234, UV-944, UV-3346 and UV-531.

9. The modified polypropylene foam reinforced material according to claim 1, characterized in that: The preparation method of the filling modifier comprises: S1, double bonded yttrium nitride powder: Mix yttrium nitride micropowder and anhydrous ethanol, add silane coupling agent KH-570 dropwise, heat to reflux and stir, after the treatment, collect the precipitate by centrifugation, wash and dry to obtain double-bonded yttrium nitride micropowder; Wherein, the mass volume ratio of yttrium nitride micropowder, silane coupling agent KH-570 and anhydrous ethanol is 1g:(0.3-0.5)g:(10-20)mL; S2. Click reaction preparation: Mix ethylene glycol bis(thioglycolate) and anhydrous ethanol, stir them thoroughly, add double-bonded yttrium nitride powder, mix them evenly by ultrasonication, then add a photoinitiator, stir and react under ultraviolet light, collect the precipitate by centrifugation, wash and dry, and obtain a filling modifier; The mass volume ratio of the double-bonded yttrium nitride powder, ethylene glycol bis(thioglycolate) and anhydrous ethanol is 1 g: (0.42-0.84) g: (15-25) mL.

10. A method for preparing the modified polypropylene foamed reinforced material according to claim 1, characterized in that: The following steps are involved: Step 1, mixing polypropylene resin, polystyrene, filler modifier and compatibilizer in a mixer, heating to 180-210° C., stirring and mixing evenly at a stirring speed of 20-80 r / min to obtain a first material; Step 2, continue to add the foaming agent, lubricant, heat stabilizer and light stabilizer to the first material, and mix them at the temperature and stirring speed of step 1 until they are uniform, to obtain the second material; Step 3, transfer the second material to a foaming machine, set the pressure to 10-15 MPa, the temperature to 200-220° C., the foaming time to 8-15 min, and after the foaming process is completed, cool to room temperature to obtain the desired material.

Images