Low-odor low-water-absorption corrosion-resistant red phosphorus flame-retardant PA composite material and preparation method thereof

Abstract

The invention relates to a low-odor low-water-absorption corrosion-resistant red phosphorus flame-retardant PA composite material, which is prepared from the following components in parts by weight: 20 to 65 parts of PA6 resin, 5 to 30 parts of PPO resin, 25 to 35 parts of glass fiber, 6 to 20 parts of red phosphorus flame-retardant master batch, 3 to 15 parts of flexibilizer, 1 to 4 parts of synergist, 0.8 to 3 parts of acid inhibitor and 0.2 to 0.9 part of antioxidant. And 0.3-1 part of a lubricant. According to the low-odor low-water-absorption corrosion-resistant red phosphorus flame-retardant PA composite material disclosed by the invention, PPO resin with low water absorption and PA6 resin are compounded as a matrix material, the overall water absorption of the system can be greatly reduced, and in addition, the acid inhibitor is matched for use, so that the problem of decomposition of the red phosphorus flame-retardant master batch in the processing process can be remarkably improved, and the flame-retardant performance of the composite material is improved. The red phosphorus flame-retardant nylon material which is low in injection molding odor, low in metal corrosion and excellent in mechanical property is prepared, and the red phosphorus flame-retardant nylon material has important significance in development and application of nylon materials in the fields of electric appliance switches, connectors and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer composite materials, and particularly relates to a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material and a preparation method thereof. Background Art

[0002] Red phosphorus flame-retardant PA6 is a polyamide 6 (PA6) material modified by adding red phosphorus as a flame retardant. It has excellent flame retardant performance and high cost performance, and can be widely applied to electronic and electrical fields such as electrical switches and connectors. However, during the use of poorly quality red phosphorus flame-retardant products, affected by environments such as heat, oxygen, and water, metal fittings on electronic and electrical products are extremely prone to corrosion, thus posing potential safety hazards. This is mainly related to the fact that nylon materials are easy to absorb water and the red phosphorus flame retardant is easy to decompose by reacting with water vapor. Therefore, how to reduce the water absorption of red phosphorus flame-retardant PA6 products and effectively prevent the decomposition reaction of red phosphorus flame retardant components when encountering water and oxygen is a major technical difficulty for red phosphorus flame-retardant nylon products. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to provide a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material and a preparation method thereof. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material selects a PPO resin with low water absorption and a PA6 resin compounded as the matrix material, and the overall water absorption rate of the system will be greatly reduced. In addition, by using an acid inhibitor in combination, the decomposition problem of red phosphorus flame-retardant masterbatch during processing can be significantly improved, and a red phosphorus flame-retardant nylon material with low injection molding odor, low corrosion to metals, and excellent mechanical properties retained is prepared, which has important significance for the development and application of nylon materials in fields such as electrical switches and connectors.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention first provides a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material, which is prepared from the following components in parts by weight: 20 - 65 parts of PA6 resin, 5 - 30 parts of PPO resin, 25 - 35 parts of glass fiber, 6 - 20 parts of red phosphorus flame-retardant masterbatch, 3 - 15 parts of toughening agent, 1 - 4 parts of synergist, 0.8 - 3 parts of acid inhibitor, 0.2 - 0.9 parts of antioxidant, and 0.3 - 1 part of lubricant.

[0006] The present invention selects a PPO resin with low water absorption and a PA6 resin compounded as the matrix material, and the overall water absorption rate of the system will be greatly reduced. In addition, by using an acid inhibitor in combination, the decomposition problem of red phosphorus flame-retardant masterbatch during processing can be significantly improved, and a red phosphorus flame-retardant nylon material with low injection molding odor, low corrosion to metals, and excellent mechanical properties retained is prepared, which has important significance for the development and application of nylon materials in fields such as electrical switches and connectors.

[0007] As a further improvement of the above solution of the present invention, the acid inhibitor includes a mixture of calcium oxide, zinc oxide, and zeolite, as well as a calcined product of hydrotalcite.

[0008] As a further improvement of the above solution of the present invention, in the mixture, the weight ratio of calcium oxide, zinc oxide, and zeolite is 2:1 - 2:1 - 3.

[0009] As a further improvement of the above solution of the present invention, the relative viscosity of the PA6 resin is 2.5 - 3.4 Pa·S.

[0010] As a further improvement of the above solution of the present invention, the molecular weight of the PPO resin is 25000 g / mol - 60000 g / mol.

[0011] As a further improvement of the above solution of the present invention, the glass fiber is an alkali-free glass fiber whose surface has been infiltrated and treated with a silane coupling agent.

[0012] As a further improvement of the above solution of the present invention, the red phosphorus flame retardant masterbatch is a multi-layer coated red phosphorus flame retardant masterbatch with a polyamide resin as the carrier, and the red phosphorus content in the red phosphorus flame retardant masterbatch is 25% - 60%.

[0013] As a further improvement of the above solution of the present invention, the toughening agent is maleic anhydride grafted SEBS;

[0014] And / or, the synergist is zinc borate;

[0015] And / or, the antioxidant includes at least one of antioxidant 1098, antioxidant Revonox 501, antioxidant S-9228, antioxidant Sumilizer S80, and antioxidant TFB 117;

[0016] And / or, the lubricant is at least one of zinc stearate, TAF, and OP wax.

[0017] The present invention also provides a method for preparing the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame retardant PA composite material as described above, which includes the following steps: uniformly mixing the dried PA6 resin, PPO resin, red phosphorus flame retardant masterbatch, synergist, acid inhibitor, antioxidant, and lubricant in proportion to obtain a mixture; adding the mixture into a twin-screw extruder from the main feed port, adding the glass fiber into the twin-screw extruder from the side feed port, and through melt extrusion and pelletizing, obtaining the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame retardant nylon composite material.

[0018] As a further improvement of the above solution of the present invention, the extrusion temperature of the twin-screw extruder is 230 - 270 °C.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention selects the compound of PPO resin with low water absorption rate and PA6 resin as the matrix material, so that the overall water absorption rate of the system will be greatly reduced. In addition, by using an acid inhibitor in combination, the decomposition problem of red phosphorus flame retardant masterbatch during processing can be significantly improved, and a red phosphorus flame retardant nylon material with low injection molding odor, low corrosion to metals and excellent mechanical properties retained is prepared, which is of great significance for the development and application of nylon materials in the fields of electrical switches and connectors, etc.

[0021] 2. The present invention selects maleic anhydride grafted SEBS as the toughening agent, uses a multi-layer coated red phosphorus flame retardant masterbatch with low odor, anti-bleeding and excellent corrosion resistance as the flame retardant material, and constitutes a synergistic system by using a self-made acid inhibitor in combination, significantly reducing the problems such as pungent odor and easy corrosion of metal fittings commonly found in conventional red phosphorus flame retardant nylon materials, and preparing a red phosphorus flame retardant nylon material with excellent mechanical properties, low odor, low water absorption rate and low corrosion, which is of great significance for the development and application of nylon materials in the fields of low-voltage electrical appliances, etc.

[0022] 3. The raw materials used in the present invention are abundant in source, the process conditions are simple and stable, and excellent mechanical properties are maintained while achieving low odor, low water absorption rate and low corrosion of the product. The obtained product has good fluidity, is easy to process and form, has stable dimensions and good heat resistance. The product of the present invention can be widely applied in the fields of electronic appliances, connectors, etc. Specific Embodiments

[0023] For the convenience of understanding the present invention, the present invention will be described more comprehensively below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0026] The PA6 resin is YH800 produced by Hunan Yuehua Chemical Industry Co., Ltd., and its relative viscosity is 2.8 Pa·S;

[0027] The glass fiber is the chopped strand 568H for PA produced by China National Fiberglass Co., Ltd., and its hydrolysis resistance is excellent;

[0028] The PPO resin is LXR040C, purchased from Bluestar New Chemical Materials Co., Ltd.;

[0029] The SEBS-g-MAH is a maleic anhydride grafted styrene-butene copolymer, purchased from Shenyang Ketong Plastic Co., Ltd.;

[0030] The red phosphorus flame retardant masterbatch is RPM 450H produced by Zhonglan Chenguang Research Institute of Chemical Industry;

[0031] The antioxidant 1098 is produced by BASF;

[0032] The stabilizer TFB 117 is sourced from Clariant;

[0033] The antioxidant S-9228 is produced by Dufu Chemical Co., Ltd.;

[0034] The 4A zeolite is sourced from Hebei Huike New Materials Co., Ltd.;

[0035] The calcined hydrotalcite LDO: self-made, obtained by calcining hydrotalcite at 500 °C for 2 hours, and the hydrotalcite is sourced from Hunan Shaoyang Tiantang Auxiliary Chemical Co., Ltd.;

[0036] The zinc borate is sourced from Xingbeida Chemical Industry;

[0037] The zinc stearate is sourced from Anhui Shafeng New Materials Co., Ltd.

[0038] The above reagents are only for illustrating the reagent sources and components used in the experiments of the present invention for full disclosure, and do not mean that the present invention cannot be achieved by using other similar reagents or reagents provided by other suppliers.

[0039] Example 1

[0040] This example presents a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame retardant PA composite material, which comprises the following component raw materials in parts by weight: 25 parts of PA6 resin, 20 parts of PPO resin, 30 parts of glass fiber, 10 parts of red phosphorus flame retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.5 part of CaO-ZnO-4A zeolite mixture (obtained by mixing CaO, ZnO, and 4A zeolite in a weight ratio of 2:2:3), 0.5 part of calcined hydrotalcite LDO, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0041] The preparation method of the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material of this embodiment includes the following steps: According to the proportion, put PA6 resin, PPO resin, red phosphorus flame-retardant masterbatch, toughening agent SEBS-g-MAH, CaO-ZnO-4A zeolite mixture, calcined hydrotalcite LDO, zinc borate, antioxidant 1098, antioxidant S-9228 and zinc stearate into a high-speed mixer and premix for 10 minutes, then add them to a twin-screw extruder at the main feeding port; then add glass fiber to the twin-screw extruder at the side feeding port according to the proportion, control the rotation speed of the twin-screw extruder to be 300 rpm, and the extrusion temperature of each zone is 180 °C in zone 1, 270 °C in zone 2, 260 °C in zone 3, 250 °C in zone 4, 245 °C in zone 5, 230 °C in zone 6, 245 °C in zone 7, 245 °C in zone 8, 250 °C in zone 9, 255 °C in zone 10, and 260 °C at the die head. After melt extrusion and pelletizing, a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant nylon composite material is obtained.

[0042] Example 2

[0043] This embodiment adopts the same implementation method as Example 1. The difference from Example 1 is that the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material of this embodiment includes the following component raw materials in parts by weight: 30 parts of PA6 resin, 5 parts of PPO resin, 30 parts of glass fiber, 10 parts of red phosphorus flame-retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.5 part of CaO-ZnO-4A zeolite mixture (obtained by mixing CaO, ZnO, and 4A zeolite according to a weight ratio of 2:2:3), 0.5 part of calcined hydrotalcite LDO, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0044] Example 3

[0045] This embodiment adopts the same implementation method as Example 1. The difference from Example 1 is that the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material of this embodiment includes the following component raw materials in parts by weight: 35 parts of PA6 resin, 10 parts of PPO resin, 30 parts of glass fiber, 10 parts of red phosphorus flame-retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.5 part of CaO-ZnO-4A zeolite mixture (obtained by mixing CaO, ZnO, and 4A zeolite according to a weight ratio of 2:2:3), 0.5 part of calcined hydrotalcite LDO, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0046] Comparative Example 1

[0047] This comparative example presents a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material, which comprises the following raw material components in parts by weight: 40 parts of PA6 resin, 5 parts of PPO resin, 30 parts of glass fiber, 10 parts of red phosphorus flame-retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0048] The preparation method of the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material in this comparative example comprises the following steps: proportionally place the PA6 resin, PPO resin, red phosphorus flame-retardant masterbatch, toughening agent SEBS-g-MAH, zinc borate, antioxidant 1098, antioxidant S-9228, and zinc stearate in a high-speed mixer and premix for 10 minutes, then add them to a twin-screw extruder at the main feeding port; then proportionally add the glass fiber to the twin-screw extruder at the side feeding port, control the rotation speed of the twin-screw extruder at 300 rpm, and the extrusion temperature of each zone is 180 °C in zone 1, 270 °C in zone 2, 260 °C in zone 3, 250 °C in zone 4, 245 °C in zone 5, 230 °C in zone 6, 245 °C in zone 7, 245 °C in zone 8, 250 °C in zone 9, 255 °C in zone 10, and 260 °C at the die head. After melt extrusion and pelletization, a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant nylon composite material is obtained.

[0049] Comparative Example 2

[0050] This comparative example presents a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material, which comprises the following raw material components in parts by weight: 25 parts of PA6 resin, 20 parts of PPO resin, 30 parts of glass fiber, 10 parts of red phosphorus flame-retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0051] The preparation method of the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material in this comparative example comprises the following steps: proportionally place the PA6 resin, PPO resin, red phosphorus flame-retardant masterbatch, toughening agent SEBS-g-MAH, zinc borate, antioxidant 1098, antioxidant S-9228, and zinc stearate in a high-speed mixer and premix for 10 minutes, then add them to a twin-screw extruder at the main feeding port; then proportionally add the glass fiber to the twin-screw extruder at the side feeding port, control the rotation speed of the twin-screw extruder at 300 rpm, and the extrusion temperature of each zone is 180 °C in zone 1, 270 °C in zone 2, 260 °C in zone 3, 250 °C in zone 4, 245 °C in zone 5, 230 °C in zone 6, 245 °C in zone 7, 245 °C in zone 8, 250 °C in zone 9, 255 °C in zone 10, and 260 °C at the die head. After melt extrusion and pelletization, a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant nylon composite material is obtained.

[0052] Comparative Example 3

[0053] This comparative example presents a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material, which comprises the following component raw materials in parts by weight: 45 parts of PA6 resin, 30 parts of glass fiber, 10 parts of red phosphorus flame-retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0054] The preparation method of the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material in this comparative example comprises the following steps: proportionally place PA6 resin, PPO resin, red phosphorus flame-retardant masterbatch, toughening agent SEBS-g-MAH, zinc borate, antioxidant 1098, antioxidant S-9228, and zinc stearate in a high-speed mixer and premix for 10 min, then add them to a twin-screw extruder at the main feeding port; proportionally add glass fiber to the twin-screw extruder at the side feeding port, control the rotation speed of the twin-screw extruder at 300 rpm, and the extrusion temperature of each zone is 180 °C in zone 1, 270 °C in zone 2, 260 °C in zone 3, 250 °C in zone 4, 245 °C in zone 5, 230 °C in zone 6, 245 °C in zone 7, 245 °C in zone 8, 250 °C in zone 9, 255 °C in zone 10, and 260 °C at the die head. After melting extrusion and pelletizing, a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant nylon composite material is obtained.

[0055] Comparative Example 4

[0056] This comparative example presents a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material, which comprises the following component raw materials in parts by weight: 44.5 parts of PA6 resin, 30 parts of glass fiber, 10 parts of red phosphorus flame-retardant masterbatch, 12 parts of toughening agent SEBS-g-MAH, 1.5 parts of zinc borate, 0.5 part of CaO-ZnO-4A zeolite mixture (obtained by mixing CaO, ZnO, and 4A zeolite in a weight ratio of 2:2:3), 0.5 part of calcined hydrotalcite LDO, 0.2 part of antioxidant 1098, 0.3 part of antioxidant S-9228, and 0.5 part of zinc stearate.

[0057] The preparation method of the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material in this comparative example includes the following steps: Place PA6 resin, PPO resin, red phosphorus flame-retardant masterbatch, toughening agent SEBS-g-MAH, zinc borate, antioxidant 1098, antioxidant S-9228, and zinc stearate in a high-speed mixer and premix for 10 minutes, then add them to a twin-screw extruder at the main feeding port; then add glass fiber to the twin-screw extruder at the side feeding port in proportion, control the rotation speed of the twin-screw extruder at 300 rpm, and the extrusion temperatures in each zone are 180°C in zone 1, 270°C in zone 2, 260°C in zone 3, 250°C in zone 4, 245°C in zone 5, 230°C in zone 6, 245°C in zone 7, 245°C in zone 8, 250°C in zone 9, 255°C in zone 10, and 260°C at the die head. After melting extrusion and pelletizing, a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant nylon composite material is obtained.

[0058] The raw material dosages in the above examples and comparative examples are shown in Table 1.

[0059] Table 1 Raw material dosages in examples and comparative examples (parts by weight)

[0060]

[0061]

[0062] Test example

[0063] Perform performance tests on the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant nylon composite materials in the above examples and comparative examples. The performance test methods and conditions are shown in Table 2, and the test results are shown in Table 3.

[0064] Table 2 Performance test methods

[0065]

[0066]

[0067] Table 3 Performance test results

[0068]

[0069]

[0070] According to the results in Table 3, it can be seen that:

[0071] Compared with Comparative Example 3, 5 parts of PPO resin and 20 parts of PPO resin are respectively added in Comparative Example 1 and Comparative Example 2, which effectively reduces the water absorption rate of the red phosphorus flame-retardant nylon. At the same time, the corrosion of brass sheets and the release of phosphine are also greatly improved. This shows that the addition of PPO can reduce the water absorption rate of the system and effectively reduce the generation of acidic substances, but there is still a slight phenomenon of copper sheet corrosion;

[0072] Compared with Comparative Example 3, a certain proportion of acid inhibitor was added in Comparative Example 4, which reduced the release of phosphine and the corrosion to copper sheets. This also shows that the acid inhibitor can inhibit the generation of acidic substances;

[0073] From the results of Example 1, it can be seen that when a certain proportion of acid inhibitor was further added on the basis of Comparative Example 2, the corrosion to copper sheets can be further reduced.

[0074] In summary, when the PPO resin with low water absorption rate is compounded with the PA6 resin as the matrix material, the overall water absorption rate of the system will be greatly reduced, and the water absorption rate is lower with the increase of the usage amount of the PPO resin; adding acid inhibitors (CaO-ZnO-4A zeolite mixture and calcined hydrotalcite LDO) helps to improve the decomposition problem of the red phosphorus flame retardant masterbatch during processing and inhibits the generation of acidic substances. Generally speaking, the release of phosphine and the corrosion to metals are both related to the acidic substances in the system and the influence of water vapor in the environment.

[0075] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0076] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material, characterized in that: The invention is prepared from the following components in parts by weight: 20-65 parts of PA6 resin, 5-30 parts of PPO resin, 25-35 parts of glass fiber, 6-20 parts of red phosphorus flame retardant masterbatch, 3-15 parts of toughening agent, 1-4 parts of synergist, 0.8-3 parts of acid inhibitor, 0.2-0.9 parts of antioxidant and 0.3-1 parts of lubricant.

2. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 1, characterized in that: The acid inhibitor includes a mixture of calcium oxide, zinc oxide, zeolite, and a calcined product of hydrotalcite.

3. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 2, characterized in that: In the mixture, the weight ratio of calcium oxide, zinc oxide and zeolite is 2:1-2:1-3.

4. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 1, characterized in that: The relative viscosity of the PA6 resin is 2.5-3.4 Pa·S.

5. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 1, characterized in that: The molecular weight of the PPO resin is 25000 g / mol-60000 g / mol.

6. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 1, characterized in that: The glass fiber is an alkali-free glass fiber whose surface is impregnated with a silane coupling agent.

7. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 1, characterized in that: The red phosphorus flame retardant masterbatch is a multi-layer coated red phosphorus flame retardant masterbatch with polyamide resin as a carrier, and the red phosphorus content in the red phosphorus flame retardant masterbatch is 25%-60%.

8. The low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 1, characterized in that: The toughening agent is SEBS grafted with maleic anhydride; And / or, the synergist is zinc borate; And / or, the antioxidant includes at least one of antioxidant 1098, antioxidant Revonox 501, antioxidant S-9228, antioxidant Sumilizer S80, and antioxidant TFB 117;. And / or, the lubricant is at least one of zinc stearate, TAF, and OP wax.

9. A method for preparing a low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to any one of claims 1 to 8, characterized in that: It includes the following steps: The dried PA6 resin, PPO resin, red phosphorus flame retardant masterbatch, synergist, acid inhibitor, antioxidant and lubricant are uniformly mixed in proportion to obtain a mixture; the mixture is added to a twin-screw extruder from a main feeding port, and glass fiber is added to the twin-screw extruder from a side feeding port. After melt extrusion and granulation, a low-odor, low-water-absorption and corrosion-resistant red phosphorus flame retardant nylon composite material is obtained.

10. The method for preparing the low-odor, low-water-absorption, corrosion-resistant red phosphorus flame-retardant PA composite material according to claim 9, characterized in that: The extrusion temperature of the twin-screw extruder is 230-270°C.

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