Halogen-free flame-retardant polyester composite material and preparation method thereof

Abstract

The present invention relates to the technical field of flame-retardant modified polyester materials, and specifically to a halogen-free flame-retardant polyester composite material and a preparation method thereof. The halogen-free flame-retardant polyester composite material comprises the following raw materials: polyester resin, low-temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives, which improves the overall flame retardancy, glow-wire ignition temperature (GWIT), CTI value and low-temperature toughness, and avoids the production of melamine or even exceeding the standard caused by the addition of MCA and MPP. Moreover, the low-temperature impact modifier used has good low-temperature toughness and does not affect the flame retardant properties of the halogen-free flame-retardant polyester composite material. The flame retardant synergist used has a good cooling effect and works synergistically with the halogen-free flame retardant to increase the glow-wire ignition temperature, replacing the traditional MCA and MPP flame retardant solutions and directly avoiding the production of melamine from the source.

Description

Technical Field

[0001] The present invention relates to the technical field of flame-retardant modified polyester materials, and in particular to a halogen-free flame-retardant polyester composite material and a preparation method thereof. Background Art

[0002] The European Chemicals Agency (ECHA) has added nine chemicals to the EU's SVHC candidate list under REACH because of their hazardous properties, including melamine flame retardant. The SVHC candidate list now contains 233 chemicals that may harm humans or the environment. Companies exporting to the EU are responsible for managing the risks of these chemicals and must provide their customers and consumers with information on the safe use of these chemicals.

[0003] Conventional halogen-free flame-retardant polyester materials previously used primarily melamine cyanurate (MCA) and melamine polyphosphate (MPP) as synergistic flame retardants. As the primary material for household appliance housings, halogen-free flame-retardant polyester materials must meet the glow-wire temperature requirement of GWIT750. Existing MCA / MPP flame-retardant polyester materials can increase the glow-wire temperature by adding MCA / MPP. However, neither MCA nor MPP can avoid the production of melamine, primarily because degradation during extrusion or downstream injection molding processes can lead to the production of melamine, or even exceed standards. Furthermore, conventional halogen-free flame-retardant polyester materials have traditionally been improved by adding large amounts of inorganic fillers to improve CTI (Current Tracking Index). However, inorganic fillers significantly impact material properties, causing a rapid decrease in toughness and even poorer low-temperature toughness. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, one of the objectives of the present invention is to provide a halogen-free flame retardant polyester composite material.

[0005] A second object of the present invention is to provide a method for preparing a halogen-free flame-retardant polyester composite material, which has simple operation, convenient control, high production efficiency, low production cost, and can be used for large-scale production.

[0006] One of the objectives of the present invention is achieved through the following technical solution: A halogen-free flame-retardant polyester composite material comprises the following raw materials in parts by weight:

[0007]

[0008] The halogen-free flame-retardant polyester composite material of this invention uses polyester resin as the primary raw material, along with a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber, and other additives. This improves overall flame retardancy, glow-wire ignition temperature (GWIT), CTI value, and low-temperature toughness. This eliminates the generation of melamine, which can even exceed standards, often associated with the addition of MCA and MPP.

[0009] Preferably, the polyester resin is at least one of polybutylene terephthalate, polyethylene terephthalate, poly(1,4-cyclohexanedimethanol terephthalate) or thermoplastic polyester elastomer (TPEE).

[0010] Preferably, the low-temperature impact modifier is maleic anhydride grafted TPEE or glycidyl ester grafted TPEE.

[0011] More preferably, the preparation method of the low-temperature impact modifier comprises the following steps:

[0012] (R1), take 100 parts of TPEE, 5-6 parts of grafting monomer, 10-20 parts of acetone and 0.2-0.4 parts of initiator by weight, and set aside;

[0013] (R2), stirring the grafting monomer, the initiator and a portion of acetone to obtain a mixed solution;

[0014] (R3) After TPEE and the remaining acetone are mixed evenly, the mixture is added under stirring conditions and mixed evenly, and then the acetone is volatilized and recovered, and then fed into a twin-screw extruder for extrusion and granulation to obtain a low-temperature impact modifier;

[0015] Wherein, the grafting monomer is maleic anhydride or glycidyl ester; the initiator is cumene peroxide, the screw speed of the twin-screw extruder is 60-80rpm, the screw aspect ratio is (18-24):1, the temperatures of each section of the twin-screw extruder are 185-190℃, 190-195℃, 190-195℃, 190-195℃, 190-195℃, 185-190℃, 185-190℃, and the head temperature is 190℃.

[0016] The low-temperature impact modifier produced using the above technical solution exhibits excellent low-temperature toughness without affecting the flame retardant properties of the halogen-free flame-retardant polyester composite. While conventional toughening agents such as MBS or POE significantly improve room-temperature toughness, adding more than 3 parts by weight of MBS or POE to the system improves compatibility and toughness, but significantly reduces flame retardancy. Furthermore, the low-temperature impact modifier, through the free radical reaction of TPEE with the grafted monomer, not only enhances compatibility but also addresses the low-temperature brittleness issue of the halogen-free flame-retardant polyester composite.

[0017] Preferably, the halogen-free flame retardant is at least one of diethyl aluminum hypophosphite, diethyl zinc hypophosphite or aluminum hypophosphite.

[0018] Preferably, the flame retardant synergist is at least one of organosilicon, metasilicate or metaphosphate.

[0019] With this technical solution, the flame retardant synergist has a strong cooling effect and works synergistically with the halogen-free flame retardant to raise the glow-wire ignition temperature, replacing traditional MCA and MPP flame retardant solutions and directly preventing the production of melamine at the source. More preferably, the organosilicon is at least one of polyphenylmethylsiloxane, polyphenylsilsesquioxane, or phenol-terminated dimethylsiloxane, the metasilicate is sodium metasilicate, and the metaphosphate is sodium metaphosphate.

[0020] Unlike existing combinations of halogen flame retardants and antimony trioxide or sodium antimonate synergistic flame retardants, the combination of this specific halogen-free flame retardant and a specific flame retardant synergist provides enhanced flame retardancy, meeting the requirements of glow-wire GWIT750, minimizing color degradation, and maintaining stable overall performance. Replacing existing halogen flame retardants with this halogen-free flame retardant can significantly reduce flame retardancy, significantly lower glow-wire GWIT, darken color, and significantly degrade overall performance.

[0021] Preferably, the CTI synergist is a crystalline polyphosphate.

[0022] The above technical solution offers very stable performance, high whiteness, and a thermal decomposition temperature exceeding 380°C. Furthermore, it exhibits excellent dispersibility, no discoloration, and no precipitation. This not only improves the CTI but also enhances flame retardancy, significantly shortening combustion time and reducing the amount of flame retardant synergists used. This avoids the use of large amounts of inorganic fillers to improve CTI, which can significantly reduce overall performance. Furthermore, it is easier to raise the overall CTI to above 600V than using barium sulfate, aluminum diethylphosphinate, or other similar materials. More preferably, the crystalline polyphosphate is calcium polyphosphate and / or zinc tripolyphosphate, which helps prevent the loss of CTI-enhancing effects upon decomposition at 250°C, thereby improving the overall CTI while preventing overall performance degradation.

[0023] Preferably, the antioxidant is a mixture of a phenolic antioxidant and a phosphite antioxidant in a weight ratio of 3:1-2; and the other auxiliary agent is toner.

[0024] Furthermore, the phenolic antioxidant is antioxidant 1010 or antioxidant 1076, and the phosphite antioxidant is antioxidant S9228.

[0025] Preferably, the glass fiber is a high modulus glass fiber.

[0026] The above technical solution has better dimensional stability, helps to increase fiber content and mechanical properties, and makes the PC composite material have higher impact strength. Furthermore, the elastic modulus of the high modulus glass fiber is 93.0GPa-95.0GPa.

[0027] The second object of the present invention is achieved by the following technical solution: The preparation method of the above-mentioned halogen-free flame-retardant polyester composite material comprises the following steps:

[0028] (S1) taking polyester resin, low temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives according to weight;

[0029] (S2) premixing the polyester resin in a high-speed mixer for 2 minutes, adding a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber and other additives, blending for 2 minutes, discharging the mixture, and extruding and granulating the mixture through a twin-screw extruder to obtain a halogen-free flame retardant polyester composite material.

[0030] Preferably, the processing temperatures of each section of the twin-screw extruder starting from the feeding section are: 200℃, 230℃, 230℃, 230℃, 220℃, 220℃, 220℃, 230℃, 230℃, the head temperature is 240℃, and the screw speed is 300r / min.

[0031] The beneficial effects of the present invention are as follows: the halogen-free flame-retardant polyester composite material of the present invention uses polyester resin as the main raw material, and incorporates a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber, and other additives to improve overall flame retardancy, glow-wire ignition temperature (GWIT), CTI value, and low-temperature toughness. This avoids the formation of melamine, or even excessive levels, that can occur with the addition of MCA and MPP.

[0032] The preparation method of the present invention is simple to operate, convenient to control, high in production efficiency, low in production cost, and can be used for large-scale production. DETAILED DESCRIPTION

[0033] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments. The contents mentioned in the embodiments are not intended to limit the present invention.

[0034] Example 1

[0035] A halogen-free flame-retardant polyester composite material comprises the following raw materials in parts by weight:

[0036]

[0037] The polyester resin is polybutylene terephthalate.

[0038] The preparation method of the low-temperature impact modifier comprises the following steps:

[0039] (R1), take 100 parts of TPEE, 5.5 parts of grafting monomer, 15 parts of acetone and 0.3 parts of initiator by weight, and set aside;

[0040] (R2), stirring the grafting monomer, the initiator and half of the acetone to obtain a mixed solution;

[0041] (R3) After TPEE and the remaining acetone are mixed evenly, the mixture is added under stirring conditions and mixed evenly, and then the acetone is volatilized and recovered, and then fed into a twin-screw extruder for extrusion and granulation to obtain a low-temperature impact modifier;

[0042] Among them, the grafting monomer is maleic anhydride; the initiator is cumene peroxide, the screw speed of the twin-screw extruder is 60 rpm, the screw aspect ratio is 20:1, the temperatures of each section of the twin-screw extruder are 190°C, 190°C, 195°C, 195°C, 195°C, 190°C, and 185°C, and the head temperature is 190°C.

[0043] The halogen-free flame retardant is diethyl aluminum hypophosphite.

[0044] The flame retardant synergist is prepared by mixing polyphenylmethylsiloxane and sodium metasilicate in a weight ratio of 1:1.

[0045] The CTI synergist is a mixture of calcium polyphosphate and zinc tripolyphosphate in a weight ratio of 3:1.

[0046] The antioxidant is a mixture of antioxidant 1010 and antioxidant S9228 in a weight ratio of 3:1.5; and the other auxiliary agent is toner.

[0047] The glass fiber is a high modulus glass fiber with an elastic modulus of 94.0 GPa.

[0048] The preparation method of the above-mentioned halogen-free flame-retardant polyester composite material comprises the following steps:

[0049] (S1) taking polyester resin, low temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives according to weight;

[0050] (S2), premixing the polyester resin in a high-speed mixer for 2 minutes, adding a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber and other additives, blending for 2 minutes, and then discharging the mixture and extruding and granulating it through a twin-screw extruder to obtain a halogen-free flame retardant polyester composite material;

[0051] Among them, the processing temperatures of each section of the twin-screw extruder starting from the feeding section are: 200℃, 230℃, 230℃, 230℃, 220℃, 220℃, 220℃, 230℃, 230℃, the head temperature is 240℃, and the screw speed is 300r / min.

[0052] Example 2

[0053] A halogen-free flame-retardant polyester composite material comprises the following raw materials in parts by weight:

[0054]

[0055]

[0056] The polyester resin is polyethylene terephthalate.

[0057] The preparation method of the low-temperature impact modifier comprises the following steps:

[0058] (R1), take 100 parts of TPEE, 5 parts of grafting monomer, 10 parts of acetone and 0.2 parts of initiator by weight, and set aside;

[0059] (R2), stirring the grafting monomer, the initiator and half of the acetone to obtain a mixed solution;

[0060] (R3) After TPEE and the remaining acetone are mixed evenly, the mixture is added under stirring conditions and mixed evenly, and then the acetone is volatilized and recovered, and then fed into a twin-screw extruder for extrusion and granulation to obtain a low-temperature impact modifier;

[0061] Among them, the grafting monomer is glycidyl ester; the initiator is cumene peroxide, the screw speed of the twin-screw extruder is 60 rpm, the screw aspect ratio is 18:1, the temperatures of each section of the twin-screw extruder are 185°C, 190°C, 190°C, 190°C, 185°C, 185°C, and the head temperature is 190°C.

[0062] The halogen-free flame retardant is diethyl zinc hypophosphite.

[0063] The flame retardant synergist is phenol-terminated dimethylsiloxane.

[0064] The CTI synergist is calcium polyphosphate.

[0065] The antioxidant is a mixture of antioxidant 1010 and antioxidant S9228 in a weight ratio of 3:1.5; and the other auxiliary agent is toner.

[0066] The glass fiber is a high modulus glass fiber with an elastic modulus of 94.0 GPa.

[0067] The preparation method of the above-mentioned halogen-free flame-retardant polyester composite material comprises the following steps:

[0068] (S1) taking polyester resin, low temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives according to weight;

[0069] (S2), premixing the polyester resin in a high-speed mixer for 2 minutes, adding a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber and other additives, blending for 2 minutes, and then discharging the mixture and extruding and granulating it through a twin-screw extruder to obtain a halogen-free flame retardant polyester composite material;

[0070] Among them, the processing temperatures of each section of the twin-screw extruder starting from the feeding section are: 200℃, 230℃, 230℃, 230℃, 220℃, 220℃, 220℃, 230℃, 230℃, the head temperature is 240℃, and the screw speed is 300r / min.

[0071] Example 3

[0072] A halogen-free flame-retardant polyester composite material comprises the following raw materials in parts by weight:

[0073]

[0074] The polyester resin is thermoplastic polyester elastomer TPEE.

[0075] The preparation method of the low-temperature impact modifier comprises the following steps:

[0076] (R1), take 100 parts of TPEE, 6 parts of grafting monomer, 20 parts of acetone and 0.4 parts of initiator by weight, and set aside;

[0077] (R2), stirring the grafting monomer, the initiator and half of the acetone to obtain a mixed solution;

[0078] (R3) After TPEE and the remaining acetone are mixed evenly, the mixture is added under stirring conditions and mixed evenly, and then the acetone is volatilized and recovered, and then fed into a twin-screw extruder for extrusion and granulation to obtain a low-temperature impact modifier;

[0079] Among them, the grafting monomer is maleic anhydride; the initiator is cumene peroxide, the screw speed of the twin-screw extruder is 80 rpm, the screw aspect ratio is 24:1, the temperatures of each section of the twin-screw extruder are 190°C, 195°C, 195°C, 195°C, 190°C, 190°C, and 190°C, and the head temperature is 190°C.

[0080] The halogen-free flame retardant is prepared by mixing diethyl aluminum hypophosphite and diethyl zinc hypophosphite in a weight ratio of 1:1.

[0081] The flame retardant synergist is prepared by mixing polyphenylmethylsiloxane and sodium metaphosphate in a weight ratio of 1:1.

[0082] The CTI synergist is a mixture of calcium polyphosphate and zinc tripolyphosphate in a weight ratio of 3:1.

[0083] The antioxidant is a mixture of antioxidant 1010 and antioxidant S9228 in a weight ratio of 3:1.5; and the other auxiliary agent is toner.

[0084] The glass fiber is a high modulus glass fiber with an elastic modulus of 94.0 GPa.

[0085] The preparation method of the above-mentioned halogen-free flame-retardant polyester composite material comprises the following steps:

[0086] (S1) taking polyester resin, low temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives according to weight;

[0087] (S2), premixing the polyester resin in a high-speed mixer for 2 minutes, adding a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber and other additives, blending for 2 minutes, and then discharging the mixture and extruding and granulating it through a twin-screw extruder to obtain a halogen-free flame retardant polyester composite material;

[0088] Among them, the processing temperatures of each section of the twin-screw extruder starting from the feeding section are: 200℃, 230℃, 230℃, 230℃, 220℃, 220℃, 220℃, 230℃, 230℃, the head temperature is 240℃, and the screw speed is 300r / min.

[0089] Example 4

[0090] A halogen-free flame-retardant polyester composite material comprises the following raw materials in parts by weight:

[0091]

[0092]

[0093] The polyester resin is thermoplastic polyester elastomer TPEE.

[0094] The preparation method of the low-temperature impact modifier comprises the following steps:

[0095] (R1), take 100 parts of TPEE, 5.8 parts of grafting monomer, 18 parts of acetone and 0.3 parts of initiator by weight, and set aside;

[0096] (R2), stirring the grafting monomer, the initiator and half of the acetone to obtain a mixed solution;

[0097] (R3) After TPEE and the remaining acetone are mixed evenly, the mixture is added under stirring conditions and mixed evenly, and then the acetone is volatilized and recovered, and then fed into a twin-screw extruder for extrusion and granulation to obtain a low-temperature impact modifier;

[0098] Among them, the grafting monomer is glycidyl ester; the initiator is cumene peroxide, the screw speed of the twin-screw extruder is 60 rpm, the screw aspect ratio is 22:1, the temperatures of each section of the twin-screw extruder are 185, 190°C, 190°C, 190°C, 190°C, 185°C, 185°C, and the head temperature is 190°C.

[0099] The halogen-free flame retardant is diethyl aluminum hypophosphite.

[0100] The flame retardant synergist is polyphenylmethylsiloxane.

[0101] The CTI synergist is a mixture of calcium polyphosphate and zinc tripolyphosphate in a weight ratio of 3:1.

[0102] The antioxidant is a mixture of antioxidant 1010 and antioxidant S9228 in a weight ratio of 3:1.5; and the other auxiliary agent is toner.

[0103] The glass fiber is a high modulus glass fiber with an elastic modulus of 94.0 GPa.

[0104] The preparation method of the above-mentioned halogen-free flame-retardant polyester composite material comprises the following steps:

[0105] (S1) taking polyester resin, low temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives according to weight;

[0106] (S2), premixing the polyester resin in a high-speed mixer for 2 minutes, adding a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber and other additives, blending for 2 minutes, and then discharging the mixture and extruding and granulating it through a twin-screw extruder to obtain a halogen-free flame retardant polyester composite material;

[0107] Among them, the processing temperatures of each section of the twin-screw extruder starting from the feeding section are: 200℃, 230℃, 230℃, 230℃, 220℃, 220℃, 220℃, 230℃, 230℃, the head temperature is 240℃, and the screw speed is 300r / min.

[0108] Comparative Example 1

[0109] The difference between this comparative example and Example 1 is:

[0110] The low-temperature impact modifier is replaced by a maleic anhydride grafted POE toughening agent.

[0111] Comparative Example 2

[0112] The difference between this comparative example and Example 1 is:

[0113] The flame retardant synergist is a mixture of antimony trioxide and sodium antimonate in a weight ratio of 1:1.

[0114] Comparative Example 3

[0115] The difference between this comparative example and Example 1 is:

[0116] The CTI synergist is barium sulfate.

[0117] Comparative Example 4

[0118] The difference between this comparative example and Example 1 is:

[0119] The CTI synergist is ammonium polyphosphate.

[0120] Performance Testing

[0121] The polyester composite materials of Examples 1-4 and Comparative Examples 1-4 were tested for notched impact strength, low-temperature notched impact strength, tensile strength, flexural strength, CTI value, glow-wire ignition temperature, and flame retardancy. The test results are shown in Table 1 below:

[0122] Table 1

[0123]

[0124]

[0125] As shown in Table 1 above, the halogen-free flame-retardant polyester composite material of the present invention, using polyester resin as the primary raw material and incorporating a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber, and other additives, improves overall flame retardancy, glow-wire ignition temperature (GWIT), CTI, and low-temperature toughness, while avoiding the generation of melamine and even exceeding standards associated with the addition of MCA and MPP. Compared to Comparative Example 1, the specific low-temperature impact modifier employed in Example 1, through a free radical reaction between TPEE and the grafted monomer, not only improves compatibility but also addresses the low-temperature brittleness issue of the halogen-free flame-retardant polyester composite material, without adversely affecting overall flame retardancy. Compared to Comparative Example 2, the synergistic effect of the specific halogen-free flame retardant and flame retardant synergist in Example 1 significantly improves overall flame retardancy and GWIT, while maintaining stable overall performance. Compared with Comparative Examples 3 and 4, Example 1 employs a specific CTI synergist, which not only improves the CTI but also assists in flame retardancy, significantly shortening the burning time and reducing the amount of flame retardant synergist used. This avoids the use of a large amount of inorganic filler to improve the CTI, which would result in a significant decrease in overall performance. Furthermore, although ammonium polyphosphate has a positive effect on CTI, the specific CTI synergist employed in this application achieves a more significant improvement.

[0126] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. A halogen-free flame-retardant polyester composite material, characterized in that: The invention comprises the following raw materials in parts by weight: The low-temperature impact modifier is maleic anhydride grafted TPEE or glycidyl ester grafted TPEE; The flame retardant synergist is at least one of organosilicon, metasilicate or metaphosphate; The CTI synergist is calcium polyphosphate and / or zinc tripolyphosphate.

2. The halogen-free flame-retardant polyester composite material according to claim 1, characterized in that: The polyester resin is at least one of polybutylene terephthalate, polyethylene terephthalate, poly(1,4-cyclohexanedimethanol terephthalate) or thermoplastic polyester elastomer (TPEE).

3. The halogen-free flame-retardant polyester composite material according to claim 1, characterized in that: The halogen-free flame retardant is at least one of diethyl aluminum hypophosphite, diethyl zinc hypophosphite or aluminum hypophosphite.

4. The halogen-free flame-retardant polyester composite material according to claim 1, characterized in that: The antioxidant is a mixture of a phenolic antioxidant and a phosphite antioxidant in a weight ratio of 3:1-2; and the other auxiliary agent is toner.

5. The halogen-free flame-retardant polyester composite material according to claim 1, characterized in that: The glass fiber is a high modulus glass fiber.

6. A method for preparing the halogen-free flame-retardant polyester composite material according to any one of claims 1 to 5, characterized in that: The steps include: (S1) taking polyester resin, low temperature impact modifier, halogen-free flame retardant, flame retardant synergist, CTI synergist, antioxidant, glass fiber and other additives according to weight; (S2) premixing the polyester resin in a high-speed mixer for 2 minutes, adding a low-temperature impact modifier, a halogen-free flame retardant, a flame retardant synergist, a CTI synergist, an antioxidant, glass fiber and other additives, blending for 2 minutes, discharging the mixture, and extruding and granulating the mixture through a twin-screw extruder to obtain a halogen-free flame retardant polyester composite material.

7. The method for preparing a halogen-free flame-retardant polyester composite material according to claim 6, wherein: The processing temperatures of the twin-screw extruder in each section starting from the feeding section are: 200℃, 230℃, 230℃, 230℃, 220℃, 220℃, 220℃, 230℃, 230℃, the head temperature is 240℃, and the screw speed is 300r / min.

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