Protein flame retardant functional masterbatch and manufacturing method thereof

Abstract

The present invention relates to a protein flame retardant functional masterbatch, comprising the following components by weight: 30-75 parts of protein, 2-8 parts of cellulose, 5-20 parts of a synergist, 0.8-2 parts of a coupling agent, 1.5-5 parts of a branching agent, 1-5 parts of a dispersant, 0.5-2 parts of a lubricant, 0.3-1 parts of an antioxidant, and 10-30 parts of a carrier material. The present invention also relates to a method for preparing a protein flame retardant functional masterbatch, which sequentially undergoes a surface pretreatment coupling capping step, a homogenization step, a banburying and dispersion step, and a continuous melt granulation step to obtain a protein functional flame retardant masterbatch. The present invention utilizes recyclable biomass to achieve the flame retardant purpose of polymer plastics, solves the compatibility and dispersibility problems, improves the protein carbonization efficiency, and improves the uniformity and stability of the carbon layer structure.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material compositions, and particularly relates to a protein flame retardant functional masterbatch and a manufacturing method thereof. Background Art

[0002] Flame retardants are used to treat polymer materials, improving their combustion performance and preventing the spread of fire, making synthetic materials self-extinguishing or flame-retardant. With the widespread application of synthetic materials in many related industries, such as construction, electrical appliances, automobiles, and aerospace, flame retardants are playing an increasingly important role in these industries. The continuous development and advancement of modern science and technology, coupled with a strong emphasis on safety, has led to increasingly stringent requirements for the safety and fire resistance of flame retardants.

[0003] Currently, the variety and production of flame retardants, primarily based on halogens, phosphorus and nitrogen, and inorganic compounds such as magnesium and aluminum, are increasing. Technologies for converting powdered flame retardants into masterbatches are also being developed and applied. Masterbatch processing not only improves flame retardancy but also reduces dust pollution, improves dispersibility, and enhances mechanical properties and flame retardant efficiency. However, flame retardants or flame retardant masterbatches based on inorganic compounds such as halogens, phosphorus and nitrogen, and magnesium and aluminum are often non-recyclable and face drawbacks such as rising raw material costs, high smoke emissions, and environmental restrictions.

[0004] In light of this, this technology leverages the physical property of protein materials, which exhibit high carbonization when exposed to flames, and uses recyclable biomass resources to synergistically increase protein carbonization efficiency, improve carbon layer stability, and simultaneously enhance compatibility and dispersibility with other materials. This results in a flame-retardant protein masterbatch. This masterbatch is suitable for polymer materials, particularly plastic product injection molding, extrusion, and film production. Summary of the Invention

[0005] The purpose of this invention is to develop a biomass-extracted protein concentrate material to achieve flame retardancy in polymer materials. A protein flame retardant masterbatch is produced through a surface coupling end-capping pretreatment process, a synergistic formulation homogenization process, a mixing and dispersion process, and a melt extrusion process.

[0006] The present invention utilizes recyclable biomass to achieve the purpose of flame retardancy of polymer plastics, solves the problems of poor compatibility and poor dispersibility of protein materials, improves the protein carbonization efficiency through synergy, improves the uniformity and stability of the carbon layer structure, and improves the mechanical properties and ease of use of the material through masterbatch.

[0007] The technical solution of the present invention:

[0008] A protein flame retardant functional masterbatch comprises the following components in parts by mass: 30-75 parts of protein, 2-8 parts of cellulose, 5-20 parts of a synergist, 0.8-2 parts of a coupling agent, 1.5-5 parts of a branching agent, 1-5 parts of a dispersant, 0.5-2 parts of a lubricant, 0.3-1 parts of an antioxidant, and 10-30 parts of a carrier material.

[0009] Furthermore, the protein comprises soy protein, corn protein or seaweed protein, and the protein component comprises one or a combination of two or more thereof; the dry basis content of the protein is 50-100%; and the average particle size of the dry basis protein powder is not higher than 5 μm;

[0010] The cellulose is derived from woody plants.

[0011] Furthermore, the synergist is silicate.

[0012] Furthermore, the synergist is sodium silicate;

[0013] The coupling agent is one or more silane coupling agents, wherein the coupling agent contains at least one reactive functional group having reactive ability;

[0014] The branching agent is a dendritic polymer containing one or more functional groups of -NH2, -OH, -COOCH3, -COONa;

[0015] The dispersant is a polymer wax;

[0016] The lubricant is stearate;

[0017] The antioxidant is hindered phenol.

[0018] Furthermore, the lubricant is zinc stearate.

[0019] Furthermore, the carrier material is one or a combination of two or more of polylactic acid PLA, a copolymer of butylene adipate and butylene terephthalate PBAT.

[0020] Furthermore, the total content of the protein component, the cellulose component and the synergist component is not less than 50% based on 100% by weight of the masterbatch.

[0021] A method for preparing a protein flame retardant functional masterbatch comprises the following steps: sequentially performing a surface pretreatment coupling end-capping process, a homogenization process, a banburying dispersion process, and a continuous melt granulation process to obtain a protein functional flame retardant masterbatch.

[0022] Furthermore, (1) surface pretreatment coupling and capping process: weigh the protein component, cellulose component, synergist component, and branching agent component and put them into an autoclave with a stirrer. The autoclave has pressure, heating, and stirring functions. After mixing for 30-60 minutes, the coupling agent component is added and the mixture is dispersed for 15-20 minutes to complete the surface pretreatment coupling and capping process.

[0023] (2) Homogenization process: the remaining components of the dispersant, lubricant, antioxidant and carrier material are put into a high-speed mixer and mixed evenly with the materials in step (1);

[0024] (3) Mixing and dispersing process: the product obtained in step (2) is put into a mixer for mixing, and then put into a twin-screw extruder for melt extrusion, and the functional masterbatch is prepared by grinding and hot cutting.

[0025] Furthermore, in step (1), the pressure of the autoclave process is adjusted to 0-8 MPa, the mixing speed is 50-200 r / min, and the temperature is adjusted to 40-220°C; after the coupling agent is added, the pressure is adjusted to 5-8 MPa and the temperature is 120-145°C;

[0026] In step (2), the speed of the high-speed stirrer is 50-200 r / min, the temperature is adjusted to 145-30° C., and the pressure is adjusted to 8-0 MPa.

[0027] Beneficial effects of the present invention:

[0028] 1. The functional masterbatch material of the present invention is preferably prepared from concentrated protein extracted from recyclable biomass, lignocellulose, and a carrier biomaterial. By utilizing the inherent properties of the biomass carbon-based polycyclic structure, when a protein-containing plastic material is exposed to flame attack, the protein thermally decomposes to form a carbonized protective layer, isolating oxygen transmission and thus imparting flame retardancy to the material. Furthermore, through synergistic and modified treatment processes, the efficiency and uniformity of protein carbonization are improved, and the density and stability of the carbon layer are enhanced. Furthermore, the protein flame-retardant material exhibits low smoke emission, a wide range of material sources, and is environmentally friendly and renewable.

[0029] 2. The present invention improves the carbonization efficiency and the integrity of the carbonization layer by utilizing lignocellulose and silicate synergist for synergistic compounding.

[0030] 3. The preparation of the raw protein flame retardant functional masterbatch of the present invention utilizes autoclave modification processing equipment and performs pre-dispersion coupling and end-capping treatment on the surface structures of protein, cellulose and silicate effector under certain pressure, temperature and mixing processes, thereby reducing the hydrophilicity of the dry powder, improving the surface activity and polarity of the material, and solving technical problems such as the dispersion difficulty and secondary agglomeration of concentrated protein and wood fiber extracted from biomass, thereby effectively improving the physical properties of the material.

[0031] 4. The preparation of the protein flame retardant functional masterbatch of the present invention is achieved by adding a dendritic polymer containing one or more functional groups of -NH2, -OH, -COOCH3, and -COONa to form a three-dimensional structure connection in the molecular chain of the biomass material, thereby increasing the polar compatibility, dispersibility, fluidity and filling rate.

[0032] 5. The preparation of the flame retardant functional masterbatch of biomass extracted concentrated protein of the present invention solves the problems of low carbonization efficiency, incomplete carbonization layer structure, low precipitation efficiency, etc. by combining biomass extracted concentrated protein, lignocellulose and synergist.

[0033] 6. The preparation of the protein flame retardant functional masterbatch of the present invention adopts carrier materials such as polylactic acid material (PLA) and copolymer of butylene adipate and butylene terephthalate (PBAT) as carriers, which can be melt-plasticized to prepare masterbatch and have the effect of synergistically increasing carbonization efficiency with protein flame retardants.

[0034] 7. The preparation of the protein flame retardant functional masterbatch of the present invention effectively solves the feeding difficulty and low yield problems caused by excessively high dry powder content ratio through the melt extrusion process after mixing, and can produce high-concentration flame retardant functional masterbatch with the characteristics of advanced, convenient and controllable process.

[0035] 8. Compared to previously disclosed patented technologies for preparing high-concentration functional masterbatches, the functional masterbatches prepared using this technology have a cumulative total concentration of protein, cellulose, and synergist components of no less than 75%. This technology offers advantages such as high concentration, low usage, and economical efficiency. DETAILED DESCRIPTION

[0036] A protein flame retardant functional masterbatch comprises the following components in parts by mass: 30-75 parts of protein, 2-8 parts of cellulose, 5-20 parts of a synergist, 0.8-2 parts of a coupling agent, 1.5-5 parts of a branching agent, 1-5 parts of a dispersant, 0.5-2 parts of a lubricant, 0.3-1 parts of an antioxidant, and 10-30 parts of a carrier material.

[0037] The process includes the following steps:

[0038] (1) Weigh the protein component, cellulose component, synergist component, and branching agent component and put them into an autoclave equipped with a stirrer. The autoclave has pressure, heating, and stirring functions. The process pressure is adjusted to 0-8 MPa, the mixing speed is 50-200 r / min, and the temperature is adjusted to 40-220°C. After mixing for 30-60 minutes, the coupling agent component is added to complete the end-capping coupling pretreatment process.

[0039] (2) The remaining components of the dispersant, lubricant, antioxidant and carrier material are added to a high-speed mixer and mixed with the materials in step (1) to homogenize. The speed of the high-speed mixer is 50-200 r / min, the temperature is adjusted to 145-30°C, and the pressure is adjusted to 8-0 MPa;

[0040] (3) The product obtained in step (2) is put into an internal mixer for internal mixing. Then, it is put into a twin-screw extruder for melt extrusion, and the functional masterbatch is prepared by grinding and hot pelletizing.

[0041] Example 1

[0042] The components used in parts by mass include: 60 kg of soybean extracted concentrated protein powder, 6 kg of wood cellulose, 8 kg of sodium silicate, 2 kg of coupling agent vinyltrichlorosilane, 3 kg of branching agent, 18 kg of PBAT, 1 kg of zinc stearate, 1.5 kg of EVA wax, and 0.5 kg of antioxidant.

[0043] Place the soy protein component, lignocellulose component, sodium silicate component, and branching agent component in the formula into an autoclave. Adjust the pressure to 3 MPa, the mixing speed to 150 r / min, the temperature to 120°C, and pre-disperse for 35 minutes. Add the coupling agent, vinyltrichlorosilane, and adjust the pressure to 5 MPa and the temperature to 145°C. Continue mixing and dispersing for 15 minutes.

[0044] The remaining components of zinc stearate, EVA wax, antioxidant and PBAT are added to the high-speed mixer in this order and all the components are mixed evenly; the speed of the high-speed mixer is 120r / min, the temperature is gradually cooled from 145°C to 30°C, and the pressure is adjusted from 5MPa to normal pressure;

[0045] The pre-treated materials are put into the internal mixer for internal mixing. Then they are put into the twin-screw extruder for melt extrusion, and the functional masterbatch is prepared by grinding and hot pelletizing.

[0046] Example 2

[0047] The formula components include: 30 kg of soybean extract concentrated protein powder, 30 kg of corn extract concentrated protein powder, 6 kg of lignocellulose, 8 kg of sodium silicate, 2 kg of coupling agent, 3 kg of branching agent, 18 kg of PBAT, 1 kg of zinc stearate, 1.5 kg of EVA wax, and 0.5 kg of antioxidant.

[0048] The protein component, lignocellulose component, sodium silicate component, and branching agent component in the formula are put into the autoclave together, the pressure is adjusted to 3 MPa, the mixing speed is 150 r / min, the temperature is adjusted to 120°C, and the pre-dispersion time is 35 minutes. Then, the coupling agent vinyltrichlorosilane is added, the pressure is adjusted to 5 MPa, the temperature is 145°C, and mixing is continued for 15 minutes.

[0049] The remaining components of zinc stearate, EVA wax, antioxidant and PBAT are added to the high-speed mixer in this order and all the components are mixed evenly; the speed of the high-speed mixer is 120r / min, the temperature is adjusted to 145℃ and gradually cooled to 30℃, and the pressure is adjusted from 5MPa to normal pressure;

[0050] The pre-treated materials are put into the internal mixer for internal mixing. Then they are put into the twin-screw extruder for melt extrusion, and the functional masterbatch is prepared by grinding and hot pelletizing.

[0051] Example 3

[0052] The components by mass include: 30 Kg of soybean extract concentrated protein powder, 30 Kg of seaweed extract concentrated protein powder, 6 Kg of lignocellulose, 8 Kg of sodium silicate, 2 Kg of coupling agent, 3 Kg of branching agent, 18 Kg of PBAT, 1 Kg of zinc stearate, 1.5 Kg of EVA wax, and 0.5 Kg of antioxidant.

[0053] The protein component, lignocellulose component, sodium silicate component, and branching agent component in the formula are put into the autoclave together, the pressure is adjusted to 3 MPa, the mixing speed is 150 r / min, the temperature is adjusted to 120°C, and the pre-dispersion time is 35 minutes. Then, the coupling agent vinyltrichlorosilane is added, the pressure is adjusted to 5 MPa, the temperature is 145°C, and mixing is continued for 15 minutes.

[0054] The remaining components of zinc stearate, EVA wax, antioxidant and PBAT are added to the high-speed mixer in this order and all the components are mixed evenly; the speed of the high-speed mixer is 120r / min, the temperature is adjusted to 145℃ and gradually cooled to 30℃, and the pressure is adjusted from 5MPa to normal pressure;

[0055] The pre-treated materials are put into the internal mixer for internal mixing. Then they are put into the twin-screw extruder for melt extrusion, and the functional masterbatch is prepared by grinding and hot pelletizing.

[0056] Table 1: Comparative Table of Formulas for Examples 1-3 (Unit: Kg)

[0057]

[0058] Example 4

[0059] The components by mass include: 30 Kg of soybean extracted concentrated protein powder, 8 Kg of lignocellulose, 5 Kg of sodium silicate, 0.8 Kg of coupling agent, 1.5 Kg of branching agent, 5 Kg of PLA, 25 Kg of PBAT, 0.5 Kg of zinc stearate, 1 Kg of EVA wax, and 0.3 Kg of antioxidant.

[0060] The protein component, lignocellulose component, sodium silicate component, and branching agent component in the formula are put into the autoclave together, the pressure is adjusted to 8 MPa, the mixing speed is 50 r / min, the temperature is adjusted to 220°C, and the pre-dispersion time is 60 minutes. Then, the coupling agent vinyltrichlorosilane is added, the pressure is adjusted to 5 MPa, the temperature is 120°C, and mixing is continued for 15 minutes.

[0061] The remaining components of zinc stearate, EVA wax, antioxidant, PLA, and PBAT are added to the high-speed mixer in this order and all the components are mixed evenly; the speed of the high-speed mixer is 50r / min, the temperature is adjusted to 120℃ and gradually cooled to 30℃, and the pressure is adjusted from 5MPa to normal pressure;

[0062] The pre-treated material was put into an internal mixer for internal mixing, and then put into a twin-screw extruder for melt extrusion, and the functional masterbatch was granulated by grinding and hot pelletizing to form Example 4.

[0063] The above products were spun with polyethylene HDPE5000S at a mass ratio of 94:6 to produce a flame-retardant dense mesh building safety net, and the flame retardant properties were tested in accordance with GB5725-2009. See Table 2

[0064] Conclusion: The flame retardant and mechanical properties can pass the national standard test and meet customer product requirements.

[0065] Example 5

[0066] The components by mass include: 75 kg of soybean extracted concentrated protein powder, 2 kg of lignocellulose, 20 kg of sodium silicate, 2 kg of coupling agent, 5 kg of branching agent, 2 kg of zinc stearate, 5 kg of EVA wax, 1 kg of antioxidant, and 10 kg of PBAT.

[0067] The protein component, lignocellulose component, sodium silicate component, and branching agent component in the formula are put into the autoclave together, the pressure is adjusted to 0 MPa, the mixing speed is 200 r / min, the temperature is adjusted to 40°C, the pre-dispersion time is 30 minutes, and then the coupling agent vinyltrichlorosilane is added, the pressure is adjusted to 8 MPa, the temperature is 145°C, and mixing is continued for 20 minutes.

[0068] The remaining components of zinc stearate, EVA wax, antioxidant, PLA, and PBAT are added to the high-speed mixer in this order and all the components are mixed evenly; the speed of the high-speed mixer is 200r / min, the temperature is adjusted to 145℃ and gradually cooled to 30℃, and the pressure is adjusted from 8MPa to normal pressure;

[0069] The pre-treated material was put into an internal mixer for internal mixing, and then put into a twin-screw extruder for melt extrusion, and the functional masterbatch was granulated by grinding and hot pelletizing to form Example 5.

[0070] The above products were mixed with EVA18-3 in a mass ratio of 72:28 to make flame retardant waterproof boards, and the flame retardant properties were tested in accordance with GB8624-2018. See Table 2

[0071] Conclusion: The flame retardant and mechanical properties can pass the national standard test and meet customer product requirements.

[0072] Table 2

[0073]

[0074] Comparative Example 1

[0075] Polypropylene plastic model: K8303 (produced by Beijing Yanshan Petrochemical) and the flame retardant functional masterbatch prepared in Examples 1, 2, and 3 were mixed in a ratio of 80:20 by mass and then injection molded into specimens. The test values according to national standards are shown in Table 3.

[0076] Table 3

[0077]

[0078] in conclusion:

[0079] 1. A protein flame retardant masterbatch prepared by the technology of the present invention is verified by three embodiments. It can achieve flame retardant function in polypropylene material with an addition ratio of 20%.

[0080] 2. Example When the content of PP is 20%, the mechanical properties of the material can be maintained.

[0081] Comparative Example 2

[0082] Regarding flame retardancy for polypropylene materials, it is well known that a halogen-antimony trioxide combination system has a high flame retardant efficiency. Therefore, the halogen flame retardant decabromodiphenylethane (produced by Taizhou Baili Chemical Co., Ltd.) and antimony trioxide (produced by Hunan Chenzhou Mining Co., Ltd.) were mixed with polypropylene K8003 at a mass ratio of 15:5:80, pelletized, and then molded into standard bars according to national standards, forming Comparative Example 2.

[0083] Comparative Example 3

[0084] A flame retardant masterbatch (manufactured by Shijiazhuang Jindi Chemical Co., Ltd., model FR-02B-HB) containing 85% decabromodiphenylethane and antimony trioxide (at a ratio of 3:1) was mixed with polypropylene K8003 at a ratio of 80:20 to form pellets, and then molded into standard strips according to national standards to form Comparative Example 3;

[0085] The results of the test of the embodiment and comparative example 2 and comparative example 3 are shown in Table 4.

[0086] Table 4

[0087]

[0088] Conclusion: By comparing the values in Table 4, it is found that the products of the three different components in the embodiment of the present invention are compared with the halogen antimony system:

[0089] 1. It has good mechanical properties and can achieve the purpose of flame retardant materials;

[0090] 2. The flame retardant efficiency and mechanical properties are better than those of powder flame retardants of halogen and antimony synergistic systems;

[0091] 3. Compared with halogen antimony flame retardant masterbatch, it has the same flame retardant efficiency and similar mechanical properties.

[0092] Comparative Example 4

[0093] Halogen-free intumescent system phosphorus-nitrogen flame retardant piperazine pyrophosphate flame retardant (produced by Chongqing Coal Research Institute Kejufu Engineering Plastics Co., Ltd., model FR-1420) dispersant EBS and polypropylene model 7926 were granulated at a mass ratio of 27:1:72 and then molded into specimens according to national standards to form comparative example 4;

[0094] Comparative Example 5

[0095] FR-1420 flame retardant masterbatch (80% concentration, produced by Shijiazhuang Jindi Chemical Co., Ltd.) and polypropylene 7926 were mixed at a ratio of 73:27 and injection molded into strips according to the national standard to form Comparative Example 5;

[0096] Comparative Example 6

[0097] The flame retardant functional masterbatch prepared in Example 1 of the present invention was mixed with polypropylene 7926 at a ratio of 25:75 and injection molded into strips according to national standards to form Comparative Example 6.

[0098] The test values of Comparative Example 4, Comparative Example 5 and Comparative Example 6 are listed in Table 5.

[0099] Table 5

[0100]

[0101] Conclusion: Through the comparison in Table 5, we found that:

[0102] 1. Adding 27% by mass of phosphorus and nitrogen flame retardants to polypropylene can pass the UL94-Vo flame retardancy test;

[0103] 2. The flame retardant masterbatch prepared by the present invention has passed UL94-Vo flame retardancy when added at 25% by mass. Under the same flame retardant efficiency, the addition ratio of the low phosphorus and nitrogen system is low;

[0104] 3. Mechanical performance: The flame retardant masterbatch of this technology invention is better than that of phosphorus-nitrogen flame retardant masterbatch, while phosphorus-nitrogen powder flame retardant is the worst;

[0105] This technology leverages the properties of biomass' carbon-based polycyclic structures to create a flame-retardant material by generating a carbonized protective layer during protein thermal decomposition, creating a new flame-retardant material approach. Through synergistic technology and surface-capping coupling treatment, it addresses the challenges of poor compatibility and dispersibility of protein-based materials. This synergistic effect improves carbonization efficiency, the uniformity and stability of the carbon layer structure, and offers numerous advantages, including no degradation of the material's mechanical properties and minimal smoke generation. This invention utilizes recyclable biomass material preparation technology, resulting in low-carbon, environmentally sustainable properties.

[0106] The embodiments described above are merely preferred implementations of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed in terms of preferred embodiments, they are not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A protein flame retardant functional masterbatch, characterized in that: The invention comprises the following components in parts by weight: 30-75 parts of protein, 2-8 parts of cellulose, 5-20 parts of synergist, 0.8-2 parts of coupling agent, 1.5-5 parts of branching agent, 1-5 parts of dispersant, 0.5-2 parts of lubricant, 0.3-1 parts of antioxidant and 10-30 parts of carrier material; The protein comprises soybean protein, corn protein or seaweed protein, and the protein component comprises one or a combination of two or more thereof; the dry basis content of the protein is 50-100%; the average particle size of the dry basis protein powder is not higher than 5 μm; The cellulose is derived from woody plants; The coupling agent is one or more silane coupling agents, wherein the coupling agent contains at least one reactive functional group having reactive ability; The branching agent is a dendritic polymer containing one or more functional groups of -NH2, -OH, -COOCH3, -COONa; The carrier material is one or a combination of two or more of polylactic acid PLA, a copolymer of butylene adipate and butylene terephthalate PBAT; The preparation method of the protein flame retardant functional masterbatch comprises the following steps: sequentially performing a surface pretreatment coupling capping process, a homogenization process, a banburying dispersion process, and a continuous melt granulation process, and then obtaining a protein functional flame retardant masterbatch, specifically: (1) Surface pretreatment coupling and capping process: Weigh the protein component, cellulose component, synergist component, and branching agent component and put them into an autoclave with a stirrer. The autoclave has pressure, heating, and stirring functions. After mixing for 30-60 minutes, add the coupling agent component and continue to disperse for 15-20 minutes to complete the surface pretreatment coupling and capping process. The pressure of the autoclave process is adjusted to 0-8 MPa, the mixing speed is 50-200 r / min, and the temperature is adjusted to 40-220°C; after the coupling agent is added, the pressure is adjusted to 5-8 MPa and the temperature is 120-145°C; (2) Homogenization process: the remaining components of the dispersant, lubricant, antioxidant and carrier material are put into a high-speed mixer and mixed evenly with the materials in step (1); (3) Mixing and dispersing process: the product obtained in step (2) is put into a mixer for mixing, and then put into a twin-screw extruder for melt extrusion, and the functional masterbatch is prepared by grinding and hot cutting; The synergist is silicate.

2. The protein flame retardant functional masterbatch according to claim 1, characterized in that: The synergist is sodium silicate; The dispersant is a polymer wax; The lubricant is stearate; The antioxidant is hindered phenol.

3. The protein flame retardant functional masterbatch according to claim 2, characterized in that: The lubricant is zinc stearate.

4. A protein flame retardant functional masterbatch according to any one of claims 1 to 3, characterized in that: The masterbatch is calculated as 100% by weight, and the total content of the protein component, the cellulose component and the synergist component is not less than 50%.

5. The protein flame retardant functional masterbatch according to claim 1, characterized in that: In step (2), the speed of the high-speed stirrer is 50-200 r / min, the temperature is adjusted to 30-145° C., and the pressure is adjusted to 0-8 MPa.

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