A plastic for automotive interior and its preparation method

Abstract

The present invention discloses a plastic for automotive interior and a preparation method thereof. The plastic for automotive interior comprises the following raw materials in parts by weight: 100 parts of polypropylene; 20 - 30 parts of linear low density polyethylene; 30 - 40 parts of POE toughening agent; 20 - 30 parts of talcum powder; 0.4 - 1.2 parts of 1010 antioxidant; 0.12 - 0.48 parts of ultraviolet absorber; 1 - 3 parts of lubricant; 30 - 40 parts of flame retardant. Preferably, the flame retardant is a composition of 4 - thiophosphoryl heterocaged phosphite and magnesium hydroxide. The present invention has good flame retardant performance. Further, by using 4 - thiophosphoryl heterocaged phosphite and magnesium hydroxide as a combined flame retardant and optimizing their weight ratio, a plastic for automotive interior with good flame retardant performance, excellent comprehensive performance and environmental friendliness has been successfully developed.

Description

Technical Field

[0001] The present invention relates to a plastic, and particularly to a plastic for automotive interior and a preparation method thereof. Background Art

[0002] Automotive interior refers to the decorative materials and components inside the vehicle cabin, which play an important role in enhancing the comfort, aesthetics, and functionality of the vehicle. With the development of the automotive industry, automotive interior materials have also undergone significant changes and innovations.

[0003] Traditional automotive interior materials mainly include natural wood, metal, and leather, etc. However, these materials have some deficiencies. Natural wood requires a large amount of resources during processing and is vulnerable to wear due to moisture, high temperature, and ultraviolet rays. Metal materials are relatively heavy, prone to rusting and heat conduction, which have a negative impact on the overall weight and fuel efficiency of the vehicle. Although leather materials are luxurious, they are expensive, and there are also certain controversies regarding animal protection and environmental protection.

[0004] To overcome the limitations of traditional materials, researchers have started to explore new types of automotive interior materials. Among them, plastic materials have become alternative materials that have received much attention due to their advantages such as light weight, good durability, strong plasticity, and relatively low price.

[0005] Currently, some plastic materials have been widely used in the field of automotive interior, such as polyurethane, polypropylene, polyethylene, etc. However, in practical applications, these plastic materials have certain deficiencies in flame retardancy. Flame retardancy is one of the key indicators of automotive interior materials, which is directly related to the safety of vehicle occupants and fire prevention performance.

[0006] Although current flame-retardant plastic materials can meet certain fire prevention requirements, there are still certain safety hazards under high temperature, high pressure, and extreme conditions. In addition, the use of traditional flame retardants will have a negative impact on the mechanical properties, processing properties, and environmental friendliness of plastic materials.

[0007] Therefore, it is necessary to develop a new type of plastic for automotive interior with excellent flame retardancy, which can ensure the safety of occupants under extreme conditions. This plastic should have excellent wear resistance, ultraviolet resistance, and mechanical properties, and at the same time have the characteristics of simple preparation process, low cost, and environmental friendliness. Summary of the Invention

[0008] To solve the above technical defects, the present invention provides a plastic for automotive interior and a preparation method thereof.

[0009] To achieve the above invention purpose, the present invention adopts the following technical solutions:

[0010] The present invention provides a plastic for automotive interior, comprising the following raw materials in parts by weight:

[0011] 100 parts of polypropylene;

[0012] 20 - 30 parts of linear low density polyethylene;

[0013] 30 - 40 parts of POE toughening agent;

[0014] 20 - 30 parts of talcum powder;

[0015] 0.4 - 1.2 parts of 1010 antioxidant;

[0016] 0.12 - 0.48 parts of ultraviolet absorber;

[0017] 1 - 3 parts of lubricant;

[0018] 30 - 40 parts of flame retardant.

[0019] In the present invention:

[0020] Polypropylene (PP) is a polymer material and belongs to polyolefin plastics. It is widely used in automotive interiors and has the following important characteristics and advantages in the present invention: Good mechanical properties: Polypropylene has relatively high strength and rigidity, making it an ideal choice for manufacturing structural components and automotive interior parts that require a certain load-bearing capacity. It has excellent tensile strength and flexural strength, can withstand stress and deformation under normal use conditions, and maintain a stable shape. Lightweight: Polypropylene is a relatively lightweight plastic material, which can effectively reduce the overall weight of the vehicle. This is of great significance for improving fuel economy, reducing carbon emissions, and enhancing vehicle performance and handling performance. Good chemical resistance: Polypropylene has good resistance to many chemicals and solvents and is not easily corroded or dissolved. This enables it to handle contact with various chemicals in automotive interiors, such as cleaners, liquids, and greases. Heat resistance: Polypropylene has good heat resistance and can maintain the stability of its structure and properties at relatively high temperatures. This is particularly important for automotive interior parts as they are often affected by high-temperature environments, such as direct sunlight or increased interior temperature. Plasticity and processability: Polypropylene has good plasticity and can be used to manufacture interior parts of various shapes and sizes through various processing techniques (such as injection molding, extrusion molding, etc.). It is easy to process and form, can meet complex design requirements, and has relatively low processing costs. Environmentally friendly: Polypropylene is a recyclable plastic material, which is beneficial to reducing the impact on the environment. At the same time, its production process generates relatively few pollutants and meets environmental protection requirements.

[0021] Linear Low-Density Polyethylene (LLDPE) is a type of polyethylene material with a linear structure and a relatively low density. In automotive interiors, LLDPE is commonly used as a plasticizer to improve the flexibility and ductility of plastics, while enhancing the strength and durability of the materials. The following are the main functions of LLDPE in the automotive interior plastics of this invention: - Increase the flexibility of plastics: The high molecular chain structure of LLDPE endows it with good flexibility and bendability, enabling it to increase the deformability and elasticity of plastics, thereby making interior components more ductile and impact-resistant. This allows plastic parts to better withstand mechanical stresses such as extrusion, bending, and deformation, reducing the risk of cracking and breaking during use. - Improve the ductility of plastics: LLDPE has good ductility and can undergo plastic deformation under stress without easily cracking. This is very important for some automotive interior components that require a certain degree of ductility, enabling them to adapt to spaces of different shapes and sizes and not easily deform or be damaged during use. - Enhance the strength and durability of materials: By adding an appropriate amount of LLDPE to polypropylene, the strength and stiffness of plastics can be increased, making interior components have better durability and tensile strength under normal use conditions. This can provide sufficient strength and stability for some interior components with higher requirements, such as seat skeletons and instrument panel brackets. - Improve the processing performance of plastics: LLDPE has good melt fluidity and thermal stability, which can improve the processing performance of plastics. It can lower the melting temperature of plastics and reduce the melt viscosity, making it easier for plastics to undergo processing processes such as injection molding, extrusion, and forming.

[0022] POE toughening agent, namely polyolefin elastomer (POE), is a thermoplastic elastomer achieved by in-situ polymerization of ethylene and α-olefins using metallocene catalysts. Among them, the crystalline region (resin phase) of the polyethylene chain acts as physical cross-linking points, having typical plastic properties. After adding a certain amount of α-olefins (1-butene, 1-hexene, 1-octene, etc.), the crystalline region of the polyethylene chain is weakened, forming an amorphous region (rubber phase) that exhibits rubber elasticity, making the product also have the properties of an elastomer. POE has the dual characteristics of plastics and rubbers and excellent comprehensive performance.

[0023] Talc powder is a commonly used filler and reinforcing agent, widely used in plastic products, including automotive interior plastics. The following is a detailed discussion of the role of talc powder in the automotive interior plastics of the present invention: Increase the hardness and strength of plastics: Talc powder has the characteristics of high hardness and high strength. Adding an appropriate amount of talc powder can effectively increase the hardness and strength of plastics. In automotive interior parts, the addition of talc powder can improve the rigidity and compressive capacity of plastic parts, making them more capable of withstanding the pressure and force effects in daily use. In addition, talc powder can also increase the abrasion resistance of plastics, making plastic interior parts have better durability. Improve the fluidity of plastics: The addition of talc powder in plastics can improve the fluidity of plastics, making it easier to flow and fill the mold during the molding process. This is very important for processes such as injection molding and extrusion molding of plastic parts. The addition of talc powder can reduce the viscosity of plastics, improve their melt fluidity, and reduce the generation of defects such as bubbles and shrinkage holes during the molding process, thereby obtaining higher-quality plastic interior parts. Improve the flame retardant performance of plastics: Talc powder has flame retardant properties to a certain extent. When talc powder is added to plastics, it can improve the flame retardant performance of plastics to a certain extent and reduce the risk of fire. This is particularly important for automotive interior parts because interior parts often come into contact with heat sources such as electrical equipment and perfumes. Therefore, having good flame retardant performance can improve the safety of riding in a vehicle.

[0024] 1010 antioxidant: 1010 antioxidant is a commonly used antioxidant used to prevent plastics from undergoing oxidation reactions during long-term use or exposure to high-temperature environments. It can slow down the aging process of plastics, extend their service life, and maintain their physical properties and appearance quality.

[0025] Ultraviolet absorber is an additive used in plastic products to absorb and block ultraviolet radiation to protect plastics from ultraviolet damage. The following are the options of ultraviolet absorbers in the present invention:

[0026] Benzophenone: Benzophenone-based ultraviolet absorbers perform well in absorbing ultraviolet light and are suitable for various plastic products. For example, Benzophenone-1 and Benzophenone-3 (also known as Oxybenzone), 2,4-dihydroxybenzophenone.

[0027] Benzotriazole: Benzotriazole-based ultraviolet absorbers have strong ultraviolet absorption ability and can provide good ultraviolet protection. Including 400 (2-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol) and 3(2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol).

[0028] Hindered Amine Light Stabilizers (HALS): HALS not only absorb UV rays, but also slow down plastic aging by free radical neutralization and oxidation protection. These compounds are usually nitrogen-substituted aromatic amines, such as 770 and 944.

[0029] (5-Triazine (Triazine): Triazine UV absorbers have good performance. Including UV-1164(2,2'-Dihydroxy-4,4'-dimethoxybenzophenone) and 119(2,4-Di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol).

[0030] Lubricants: Lubricants play a lubricating role in plastics, reducing friction and adhesion between plastics and molds or other surfaces. It helps in the plastic forming and processing processes and improves the surface smoothness of plastic products. Specifically, the following can be selected: (1) Stearic acid and its sodium salt: Stearic acid and its sodium salt are commonly used lubricants. They can reduce the viscosity of plastics, improve the fluidity of molten plastics and the demolding performance of molds. (2) Polyethylene wax: Polyethylene wax has good lubricating properties, can reduce the friction coefficient of plastics, improve the surface smoothness of plastics, and enhance the processing performance of plastics. (3) Stearate lubricants: Stearate lubricants have good heat resistance and lubricating properties and can maintain the fluidity and processing performance of plastics under high-temperature conditions. (4) Stearamide: Stearamide is a commonly used internal lubricant. It can form a lubricating layer in plastics, reduce the friction between plastic particles, and improve the fluidity of plastics. (5) Polyglycerol stearate: Polyglycerol stearate is an efficient lubricant with excellent lubricating properties and thermal stability, which can improve the fluidity and processing performance of plastics. (6) Silicone oil: Silicone oil is a commonly used lubricant. It can reduce the viscosity of plastics, improve fluidity, and enhance the surface smoothness of plastic products. (7) Fatty acid amide: Fatty acid amide is a commonly used lubricant. It can reduce the surface tension of plastics, improve the fluidity and processing performance of plastics. (8) Fatty alcohol: Fatty alcohol is a common lubricant. It has good lubricating properties and can improve the fluidity and surface quality of plastics. (9) Wax lubricants: Besides polyethylene wax, other types of wax lubricants such as hydroxy wax, ester wax, etc. are also commonly used in plastics. They can improve the lubricating properties and processing performance of plastics.

[0031] Flame retardants: Flame retardants are used to improve the flame retardancy of plastics and reduce the risk of their combustion and fire. Flame retardants can slow down the burning speed of plastics, reduce the spread of flames and the generation of smoke, providing higher safety. In the present invention, the flame retardants are organic phosphorous flame retardants and / or halogen-free flame retardants.

[0032] Preferably, the organic phosphorous flame retardant is 4-thiophosphoryl heterocaged phosphite. The raw material trimethylol sulfide phosphine used in this compound is itself an excellent reactive organic phosphorous flame retardant. Reacting with triphenyl phosphite introduces a polyester structure and at the same time increases the phosphorus content. The synergistic flame retardancy of phosphorus and sulfur elements is high. Its specific structural formula is:

[0033]

[0034] Preferably, the halogen-free flame retardants are magnesium hydroxide and aluminum hydroxide.

[0035] Preferably, the flame retardant is 4-thiophosphoryl heterocaged phosphite and magnesium hydroxide. Preferably, the flame retardant is composed of 30-50 wt% of 4-thiophosphoryl heterocaged phosphite and 50-70 wt% of magnesium hydroxide.

[0036] The present invention also provides a method for preparing the above-mentioned plastic for automotive interior trim, which includes the following steps: weighing each raw material, mixing them evenly, and then performing melt mixing and extrusion granulation.

[0037] Preferably, the present invention also provides a method for preparing the above-mentioned plastic for automotive interior trim, and the specific steps are as follows:

[0038] Weigh each raw material: According to the given formula, accurately weigh the required weight parts of polypropylene, linear low-density polyethylene, POE toughening agent, talcum powder, antioxidant 1010, ultraviolet absorber 2,4-dihydroxybenzophenone, lubricant sodium stearate, and flame retardant 4-thiophosphoryl heterocaged phosphite.

[0039] Mix evenly: Put the weighed raw materials into a general mixer and mix them evenly to make each component fully mixed.

[0040] Melt mixing: Transfer the evenly mixed raw materials to a general screw extruder for melt mixing. The raw materials are melted and mixed by the rotation and heating of the screw to form a uniform melt.

[0041] Extrusion granulation: After melt mixing, extrude and granulate the melt through the die of the extruder. According to the required forming form and size, select a suitable extruder and die, and control the extrusion speed and temperature to make the melt form the required particles or profiles through the die.

[0042] The above steps describe the basic process of preparing the plastic for automotive interior trim. Through steps such as weighing raw materials, mixing evenly, melt mixing, and extrusion granulation, a plastic product with the required formula and performance can be obtained.

[0043] The present invention has successfully developed a plastic for automotive interior trim with good flame retardancy, excellent comprehensive performance, and environmental friendliness by using 4-thiophosphoryl heterocaged phosphite and magnesium hydroxide as flame retardants and optimizing their weight ratio. Specific embodiments

[0044] For polypropylene, Tianjin Petrochemical PP6012 polypropylene is selected.

[0045] For linear low-density polyethylene, the linear low-density polyethylene with the brand number 6135NE of Saudi SABIC is selected.

[0046] For the POE toughening agent, the POE polyolefin elastomer ENGAGE 7457 of DowDuPont of the United States is selected.

[0047] Talc powder, talc powder with a mesh size of 800 - 1250 provided by Guangyuan Superfine Powder Co., Ltd., Jiangyin City.

[0048] The ultraviolet absorber is selected as 2,4 - dihydroxybenzophenone.

[0049] The lubricant is selected as sodium stearate.

[0050] 4 - thiophosphoryl heterocaged phosphite, 4 - thiophosphoryl heterocaged phosphite prepared by the method of Example 1 of CN105037438A.

[0051] Magnesium hydroxide, high - purity magnesium hydroxide ZH - H6 provided by Jiangsu Zehui Magnesium - based New Material Technology Co., Ltd.

[0052] Example 1

[0053] A plastic for automotive interior, comprising the following raw materials in parts by weight:

[0054] 100 parts of polypropylene;

[0055] 25 parts of linear low - density polyethylene;

[0056] 35 parts of POE toughening agent;

[0057] 25 parts of talc powder;

[0058] 0.8 part of antioxidant 1010;

[0059] 0.3 part of ultraviolet absorber 2,4 - dihydroxybenzophenone;

[0060] 2 parts of lubricant sodium stearate;

[0061] 35 parts of flame retardant 4 - thiophosphoryl heterocaged phosphite.

[0062] Weigh each raw material: According to the given formula, accurately weigh the required parts by weight of polypropylene, linear low - density polyethylene, POE toughening agent, talc powder, antioxidant 1010, ultraviolet absorber 2,4 - dihydroxybenzophenone, lubricant sodium stearate and flame retardant.

[0063] Mix evenly: Put the weighed raw materials into a general mixer and mix evenly to make each component fully mixed.

[0064] Melt and mix: Transfer the evenly - mixed raw materials to a general screw extruder for melt - mixing. The raw materials are melted and mixed by the rotation and heating of the screw to form a uniform melt.

[0065] Extrusion granulation: After melting and kneading, the melt is extruded and granulated through the die of an extruder. Select a suitable extruder and die according to the required forming shape and size, and control the extrusion speed and temperature so that the melt passes through the die to form the required particles or profiles.

[0066] Example 2

[0067] A plastic for automotive interior, comprising the following raw materials in parts by weight:

[0068] 100 parts of polypropylene;

[0069] 25 parts of linear low density polyethylene;

[0070] 35 parts of POE toughening agent;

[0071] 25 parts of talcum powder;

[0072] 0.8 part of antioxidant 1010;

[0073] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0074] 2 parts of lubricant sodium stearate;

[0075] 35 parts of flame retardant magnesium hydroxide.

[0076] The preparation method is the same as that of Example 1.

[0077] Example 3

[0078] A plastic for automotive interior, comprising the following raw materials in parts by weight:

[0079] 100 parts of polypropylene;

[0080] 25 parts of linear low density polyethylene;

[0081] 35 parts of POE toughening agent;

[0082] 25 parts of talcum powder;

[0083] 0.8 part of antioxidant 1010;

[0084] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0085] 2 parts of lubricant sodium stearate;

[0086] 35 parts of flame retardant.

[0087] The flame retardant is composed of 30 wt% of 4-thiophosphoryl heterocaged phosphite and 70 wt% of magnesium hydroxide.

[0088] The preparation method is the same as that of Example 1.

[0089] Example 4

[0090] A plastic for automotive interior trim, comprising the following raw materials in parts by weight:

[0091] 100 parts of polypropylene;

[0092] 25 parts of linear low density polyethylene;

[0093] 35 parts of POE toughening agent;

[0094] 25 parts of talcum powder;

[0095] 0.8 part of antioxidant 1010;

[0096] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0097] 2 parts of lubricant sodium stearate;

[0098] 35 parts of flame retardant.

[0099] The flame retardant is composed of 50 wt% of 4-thiophosphoryl heterocaged phosphite and 50 wt% of magnesium hydroxide.

[0100] The preparation method is the same as that of Example 1.

[0101] Example 5

[0102] A plastic for automotive interior trim, comprising the following raw materials in parts by weight:

[0103] 100 parts of polypropylene;

[0104] 25 parts of linear low density polyethylene;

[0105] 35 parts of POE toughening agent;

[0106] 25 parts of talcum powder;

[0107] 0.8 part of antioxidant 1010;

[0108] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0109] 2 parts of lubricant sodium stearate;

[0110] 35 parts of flame retardant.

[0111] The flame retardant is composed of 20 wt% of 4-thiophosphoryl heterocaged phosphite and 80 wt% of magnesium hydroxide.

[0112] The preparation method is the same as that of Example 1.

[0113] Example 6

[0114] A plastic for automotive interior trim, comprising the following raw materials in parts by weight:

[0115] 100 parts of polypropylene;

[0116] 25 parts of linear low density polyethylene;

[0117] 35 parts of POE toughening agent;

[0118] 25 parts of talcum powder;

[0119] 0.8 part of antioxidant 1010;

[0120] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0121] 2 parts of lubricant sodium stearate;

[0122] 35 parts of flame retardant.

[0123] The flame retardant is composed of 60wt% 4-thiophosphoryl heterocaged phosphite and 40wt% magnesium hydroxide.

[0124] The preparation method is the same as that of Example 1.

[0125] Example 7

[0126] A plastic for automobile interior decoration, comprising the following raw materials in parts by weight:

[0127] 100 parts of polypropylene;

[0128] 25 parts of linear low density polyethylene;

[0129] 35 parts of POE toughening agent;

[0130] 25 parts of talcum powder;

[0131] 0.8 part of antioxidant 1010;

[0132] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0133] 2 parts of lubricant sodium stearate;

[0134] 35 parts of flame retardant aluminum hydroxide.

[0135] The preparation method is the same as that of Example 1.

[0136] Example 8

[0137] A plastic for automobile interior decoration, comprising the following raw materials in parts by weight:

[0138] 100 parts of polypropylene;

[0139] 25 parts of linear low density polyethylene;

[0140] 35 parts of POE toughening agent;

[0141] 25 parts of talcum powder;

[0142] 0.8 part of antioxidant 1010;

[0143] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0144] 2 parts of lubricant sodium stearate;

[0145] 35 parts of flame retardant.

[0146] The flame retardant is composed of 50 wt% of 4-thiophosphoryl heterocaged phosphite and 50 wt% of aluminum hydroxide.

[0147] The preparation method is the same as that in Example 1.

[0148] Blank example

[0149] A plastic for automobile interior decoration, comprising the following raw materials in parts by weight:

[0150] 100 parts of polypropylene;

[0151] 25 parts of linear low density polyethylene;

[0152] 35 parts of POE toughening agent;

[0153] 25 parts of talcum powder;

[0154] 0.8 part of antioxidant 1010;

[0155] 0.3 part of ultraviolet absorber 2,4-dihydroxybenzophenone;

[0156] 2 parts of lubricant sodium stearate.

[0157] The preparation method is the same as that in Example 1.

[0158] Test Example 1:

[0159] Example 3: Heat distortion temperature 123.5 °C; Tensile strength 20.1 MPa; Elongation at break 106%; Flexural modulus 1750 MPa.

[0160] Test Example 2:

[0161] The limiting oxygen index is tested according to the standard of GB / T2406.2-2009. The goal of this standard is to identify the lowest oxygen concentration required for the material to start burning. The test specimen should be of Type I, with a length of 100 mm, a width of 10 mm, and a thickness of 4 mm. The ignition method applied is Method A.

[0162] When conducting the test, 20 samples to be tested of the same batch are selected for parallel testing. After obtaining the test results of these 20 samples, the average value is calculated as the final test result.

[0163] Table 1: Flame Retardancy Performance Test Table

[0164]

[0165]

[0166] Comparing Examples 1 - 4, the differences are as follows: In Example 1, a single flame retardant, 4 - thiophosphoryl heterocaged phosphite, is used; in Example 2, a single flame retardant, magnesium hydroxide, is used; and in Examples 3 and 4, a compound flame retardant of 4 - thiophosphoryl heterocaged phosphite and magnesium hydroxide is used. Tests have proven that the flame retardancy effect (limiting oxygen index) in Examples 3 and 4 is significantly greater than that in Examples 1 and 2. It can be seen that the compounding of 4 - thiophosphoryl heterocaged phosphite and magnesium hydroxide has a synergistic effect on flame retardancy performance.

[0167] Magnesium hydroxide begins to decompose at high temperatures, converting into magnesium oxide (MgO) and water vapor. This reaction absorbs a large amount of heat, helping to reduce the temperature of the material, delaying or preventing the combustion process. At the same time, the generated magnesium oxide forms a thermally stable protective layer that can resist high temperatures and block the direct contact of the flame with the material. 4 - thiophosphoryl heterocaged phosphite is an organic flame retardant containing phosphorus and sulfur. At high temperatures, it may decompose to form low - molecular - weight compounds containing phosphorus and sulfur and form a heat - insulating char layer. This char layer can not only block the propagation of heat but also limit the contact of oxygen with the material, thereby reducing the combustion rate. Although we do not fully understand whether 4 - thiophosphoryl heterocaged phosphite and magnesium hydroxide will undergo specific chemical reactions at high temperatures, we can assume that the phosphorus - and sulfur - containing compounds generated by the decomposition of 4 - thiophosphoryl heterocaged phosphite may react with magnesium oxide (the product of the decomposition of magnesium hydroxide) to form a new phosphate or sulfate. This new compound may have stronger thermal stability and flame retardancy effect. The combined action of the above mechanisms may lead to the synergistic effect of 4 - thiophosphoryl heterocaged phosphite and magnesium hydroxide on flame retardancy performance. However, to further verify and understand these mechanisms, more experimental studies may be needed, including in - depth analysis of the reaction process, combustion behavior, and residues after combustion of the material at high temperatures.

Claims

1. A plastic for automotive interior, comprising the following raw materials in parts by weight: 100 parts of polypropylene; 20 - 30 parts of linear low density polyethylene; 30 - 40 parts of POE toughening agent; 20 - 30 parts of talcum powder; 0.4 - 1.2 parts of 1010 antioxidant; 0.12 - 0.48 parts of ultraviolet absorber; 1 - 3 parts of lubricant; 30 - 40 parts of flame retardant; The flame retardant consists of 30 - 50 wt% of 4 - thiophosphoryl heterocaged phosphite and 50 - 70 wt% of magnesium hydroxide.

2. The plastic for automotive interior according to claim 1, wherein: The ultraviolet absorber is at least one of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, hindered amine ultraviolet absorbers and triazine ultraviolet absorbers.

3. A plastic for automotive interior as described in claim 1, characterized in that: The lubricant is at least one of stearic acid and its sodium salt, stearate lubricants, silicone oil, fatty acid amides, fatty alcohols and wax lubricants.

4. The preparation method of a plastic for automobile interior according to any one of claims 1-3, characterized in that, Weigh each raw material, mix them evenly, then carry out melt mixing and extrusion granulation.

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