Polyamide PPS composite material and preparation method thereof

Abstract

The invention discloses a polyamide PPS composite material and a preparation method thereof, the polyamide PPS composite material comprises the following components: 23-69.3 parts of polyphenylene sulfide (PPS), 10-30 parts of polyamide (PA), 20-40 parts of glass fiber (GF), 0.1-2 parts of a heating additive and 0.1-2 parts of an auxiliary additive, a melt polymerization reaction is carried out under the action of a high temperature and a catalyst, the temperature, pressure and reaction time need to be strictly controlled in the melt polymerization process, and the PPS composite material is prepared. The melting temperature is accurately controlled; the temperature is adjusted according to the characteristics of different materials, so that PPS discoloration caused by too high or too low temperature is avoided; the temperature of a charging barrel, especially the temperatures of the first two stages, is gradually reduced, so that the possibility of thermal decomposition and color change is reduced; and parameters such as the rotating speed of the screw, the back pressure and the injection rate are controlled, so that overhigh shearing heat is avoided, and the risks of fracture and local burn of the PPS melt are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of polyamide PPS, in particular to a polyamide PPS composite material and a preparation method thereof. Background Art

[0002] Polyamide PPS (polyphenylene sulfide) is a white, highly crystalline, hard and brittle polymer. PPS has excellent heat resistance, friction reduction and self-lubrication, chemical stability, dimensional stability, flame retardancy and electrical insulation.

[0003] In the chemical industry, PPS can be used as reaction tanks, pipelines, valves, chemical pumps, etc. for synthesizing, transporting, and storing materials; in the machinery industry, it can be used to make impellers, blades, gears, eccentric wheels, bearings, clutches and other parts; in the field of electronics and electrical appliances, PPS can be used to make transformer skeletons, high-frequency coil skeletons, plugs, sockets, terminal blocks, contactor drums and various parts.

[0004] During the PPS production process, the inhomogeneity of the material caused by factors such as unstable raw material quality, uneven mixing or temperature fluctuations during the production process leads to large differences in the performance of the products.

[0005] During the production process, PPS may change color due to material inhomogeneity, temperature fluctuations during processing, or interaction with other materials. This discoloration may affect the appearance and quality of PPS products.

[0006] To this end, we propose a polyamide PPS composite material and a preparation method thereof to solve the above problems. Summary of the invention

[0007] One of the purposes of the present invention is to provide a polyamide composite material that can be gas-assisted molded to solve the problem that in the production process of PPS, the material inhomogeneity is caused by factors such as unstable raw material quality, uneven mixing or temperature fluctuations during the production process, resulting in large performance differences in the products.

[0008] The second object of the present invention is to provide a method for preparing a polyamide composite material that can be gas-assisted molded, so as to solve the problem that PPS causes discoloration due to material inhomogeneity, temperature fluctuations during processing, or interactions with other materials. Discoloration may affect the appearance and quality of PPS products:

[0009] In order to achieve one of the above purposes, the embodiment of the present application adopts the following technical solution: a polyamide composite material capable of gas-assisted molding, comprising the following components:

[0010] 1 Polyphenylene sulfide (PPS): 23-69.3;

[0011] 2 Polyamide (PA): 10-30;

[0012] 3. Glass fiber (GF): 20-40;

[0013] 4 Heating additive: 0.1-2;

[0014] 5. Auxiliary additives: 0.1-2.

[0015] In the above technical scheme, the embodiment of the present application combines polyphenylene sulfide, polyamide, glass fiber, heating additives and auxiliary additives. The addition of glass fiber can significantly improve the rigidity and strength of the PPS composite material, while reducing the thermal expansion coefficient. The thermal stabilizer is mainly used to improve the heat resistance and antioxidant properties of the PPS composite material. The crystallization promoter can effectively reduce the crystallization temperature of the material and increase the crystallization rate, thereby optimizing the physical and chemical properties of the material. During the processing, the crystallization promoter can significantly improve the crystallization efficiency of PPS, so that it can still maintain high-speed crystallization during the cooling process, thereby improving the quality and performance of PPS products.

[0016] In a further embodiment, the heating additive 4 is a thermal stabilizer and a silane coupling agent.

[0017] In a further embodiment, the auxiliary additive 5 is a processing lubricant and a crystallization accelerator.

[0018] To achieve the second objective above, the present application embodiment adopts the following technical solution: a method for preparing a polyamide composite material capable of gas-assisted molding, comprising the following steps:

[0019] Raw material selection: The raw materials of PPS mainly include phenylene sulfide monomer and other additives.

[0020] Raw material pretreatment: Pretreatment of selected raw materials.

[0021] Batching and mixing: Mix the pretreated raw materials, additives and catalysts evenly in a certain proportion to ensure the accurate proportion of each component.

[0022] Melt polymerization: The mixed raw materials are fed into a polymerization reactor and melt polymerization reaction is carried out under the action of high temperature and catalyst.

[0023] Cooling and solidification: After the melt polymerization reaction is completed, the product is quickly cooled and solidified to keep a stable shape.

[0024] Crushing and screening: The cooled and solidified PPS product is crushed and screened to obtain a granular PPS product that meets the requirements.

[0025] Washing and drying: Wash the screened PPS particles to remove impurities and residues on the surface, and then dry them to make the product meet the specified humidity requirements.

[0026] Melt extrusion: After production, the PPS particles are fed into a melt extruder and, after steps such as melting, extrusion and cooling, are prepared into PPS products with specific shapes and sizes.

[0027] In the above technical scheme, the embodiment of the present application improves the molding performance of the polyamide composite material by vacuum assisted molding, gas assisted molding, etc. These technologies can effectively control the flow and cooling process of the material, reduce the generation of residual stress, and improve the dimensional stability and appearance quality of the product.

[0028] In a further embodiment, when selecting raw materials, it is necessary to ensure that the purity and quality of the raw materials meet the production requirements.

[0029] In a further embodiment, the raw material pretreatment includes steps such as washing, drying and crushing to remove impurities and moisture and improve the uniformity and stability of the raw material.

[0030] In a further embodiment, the melt polymerization process requires strict control of temperature, pressure and reaction time to ensure smooth polymerization and stable product quality.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention utilizes glass fiber to significantly improve the rigidity and strength of the PPS composite material, while reducing the thermal expansion coefficient. The heat stabilizer is mainly used to improve the heat resistance and oxidation resistance of the PPS composite material. The crystallization accelerator can effectively reduce the crystallization temperature of the material and increase the crystallization speed, thereby optimizing the physical and chemical properties of the material. During the processing, the crystallization accelerator can significantly improve the crystallization efficiency of PPS, so that it can still maintain high-speed crystallization during the cooling process, thereby improving the quality and performance of PPS products.

[0033] 2. The present invention feeds the mixed raw materials into a polymerization reactor, and performs a melt polymerization reaction under the action of high temperature and a catalyst. The melt polymerization process requires strict control of temperature, pressure and reaction time to ensure the smooth progress of the polymerization reaction and the stability of product quality. The melt temperature is precisely controlled and adjusted according to the characteristics of different materials to avoid discoloration of PPS due to excessively high or low temperature. The barrel temperature is gradually reduced, especially the temperature of the first two sections, to reduce the possibility of thermal decomposition and color change. The parameters such as screw speed, back pressure and injection rate are controlled to avoid excessive shear heat, thereby reducing the risk of PPS melt fracture and local burns. DETAILED DESCRIPTION

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship as shown, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] A polyamide composite material capable of gas-assisted molding according to the present invention comprises the following components:

[0038] 1. Polyphenylene sulfide (PPS): 23-69.3;

[0039] 2. Polyamide (PA): 10-30;

[0040] 3. Glass fiber (GF): 20-40;

[0041] 4. Heating additive: 0.1-2;

[0042] 5. Auxiliary additives: 0.1-2.

[0043] The heating additive 4 is a heat stabilizer and a silane coupling agent.

[0044] Auxiliary additives 5 are processing lubricants and crystallization accelerators.

[0045] The preparation method of the polyamide PPS composite material of the present invention comprises the following components:

[0046] 6. Raw material selection: The raw materials of PPS mainly include phenylene sulfide monomer and other additives.

[0047] 7. Raw material pretreatment: Pretreatment of selected raw materials.

[0048] 8 Batching and mixing: Mix the pretreated raw materials, additives and catalysts evenly in a certain proportion to ensure the accurate proportion of each component.

[0049] 9 Melt polymerization: The mixed raw materials are fed into a polymerization reactor and melt polymerization reaction is carried out under the action of high temperature and catalyst.

[0050] 10 Cooling and solidification: After the melt polymerization reaction is completed, the product is quickly cooled and solidified to keep a stable shape.

[0051] 11 Crushing and screening: The cooled and solidified PPS product is crushed and screened to obtain a granular PPS product that meets the requirements.

[0052] 12 Washing and drying: Wash the screened PPS particles to remove impurities and residues on the surface, and then dry them to make the product meet the specified humidity requirements.

[0053] 13 Melt extrusion: The PPS particles after production are fed into the melt extruder, and after the steps of melting, extrusion and cooling, they are prepared into PPS products with specific shapes and sizes.

[0054] When selecting raw materials 6, it is necessary to ensure that the purity and quality of the raw materials meet production requirements.

[0055] Raw material pretreatment 7 includes steps such as cleaning, drying and crushing to remove impurities and moisture and improve the uniformity and stability of the raw materials.

[0056] The melt polymerization process requires strict control of temperature, pressure and reaction time to ensure the smooth progress of the polymerization reaction and the stability of product quality.

[0057] Example 1

[0058] A polyamide PPS composite material and a preparation method thereof of the present invention comprises the following steps:

[0059] Polyphenylene sulfide (PPS): 36;

[0060] Polyamide (PA): 20;

[0061] Glass fiber (GF): 30;

[0062] Heating additive: 1;

[0063] Auxiliary additives:1.

[0064] Raw material selection:

[0065] The raw materials of PPS mainly include phenylene sulfide monomer and other additives. When selecting raw materials, it is necessary to ensure that the purity and quality of the raw materials meet the production requirements.

[0066] Raw material pretreatment:

[0067] The selected raw materials are pretreated, which includes steps such as cleaning, drying and crushing to remove impurities and moisture and improve the uniformity and stability of the raw materials.

[0068] Ingredients and Mixing:

[0069] The pretreated raw materials, additives and catalysts are mixed evenly in a certain proportion to ensure the accurate proportion of each component.

[0070] Melt Polymerization:

[0071] The mixed raw materials are fed into a polymerization reactor and melt polymerization is carried out under the action of high temperature and catalyst. The melt polymerization process requires strict control of temperature, pressure and reaction time to ensure the smooth progress of the polymerization reaction and the stability of the product quality.

[0072] Cooling and curing:

[0073] After the melt polymerization reaction is completed, the product is rapidly cooled and solidified to keep a stable shape.

[0074] Crushing and screening:

[0075] The cooled and solidified PPS product is crushed and sieved to obtain a granular PPS product that meets the requirements.

[0076] Washing and drying:

[0077] The screened PPS particles are washed to remove surface impurities and residues, and then dried to ensure that the product meets the specified humidity requirements.

[0078] Melt extrusion:

[0079] The produced PPS particles are fed into a melt extruder and, after the steps of melting, extrusion and cooling, are prepared into PPS products with specific shapes and sizes.

[0080] Example 2

[0081] A polyamide PPS composite material and a preparation method thereof of the present invention comprises the following steps:

[0082] Polyphenylene sulfide (PPS): 55.5;

[0083] Polyamide (PA): 15;

[0084] Glass fiber (GF): 25;

[0085] Heating additive: 1.5;

[0086] Auxiliary additives:1.5.

[0087] Raw material selection:

[0088] The raw materials of PPS mainly include phenylene sulfide monomer and other additives. When selecting raw materials, it is necessary to ensure that the purity and quality of the raw materials meet the production requirements.

[0089] Raw material pretreatment:

[0090] The selected raw materials are pretreated, which includes steps such as cleaning, drying and crushing to remove impurities and moisture and improve the uniformity and stability of the raw materials.

[0091] Ingredients and Mixing:

[0092] The pretreated raw materials, additives and catalysts are mixed evenly in a certain proportion to ensure the accurate proportion of each component.

[0093] Melt Polymerization:

[0094] The mixed raw materials are fed into a polymerization reactor and melt polymerization is carried out under the action of high temperature and catalyst. The melt polymerization process requires strict control of temperature, pressure and reaction time to ensure the smooth progress of the polymerization reaction and the stability of the product quality.

[0095] Cooling and curing:

[0096] After the melt polymerization reaction is completed, the product is rapidly cooled and solidified to keep a stable shape.

[0097] Crushing and screening:

[0098] The cooled and solidified PPS product is crushed and sieved to obtain a granular PPS product that meets the requirements.

[0099] Washing and drying:

[0100] The screened PPS particles are washed to remove surface impurities and residues, and then dried to ensure that the product meets the specified humidity requirements.

[0101] Melt extrusion:

[0102] The produced PPS particles are fed into a melt extruder and, after the steps of melting, extrusion and cooling, are prepared into PPS products with specific shapes and sizes.

[0103] Example 3

[0104] The preparation method of the polyamide PPS composite material of the present invention comprises the following steps:

[0105] Raw material selection:

[0106] The raw materials of PPS mainly include phenylene sulfide monomer and other additives. When selecting raw materials, it is necessary to ensure that the purity and quality of the raw materials meet the production requirements, strictly screen the raw materials, ensure that the PPS raw materials used are pure and of stable quality, and avoid being mixed with other impurities or foreign matter.

[0107] Raw material pretreatment:

[0108] The selected raw materials are pretreated, including steps such as cleaning, drying and crushing, to remove impurities and moisture, improve the uniformity and stability of the raw materials, and conduct strict quality inspections on the recycled materials to ensure that they meet production requirements and avoid the use of unqualified recycled materials.

[0109] Ingredients and Mixing:

[0110] Mix the pretreated raw materials, additives and catalysts in a certain proportion to ensure the accurate proportion of each component, optimize the formula and method of the mixed materials, ensure that the various raw materials are mixed evenly, and avoid discoloration due to improper proportions or uneven mixing.

[0111] Melt Polymerization:

[0112] The mixed raw materials are fed into the polymerization reactor and melt polymerization is carried out under the action of high temperature and catalyst. The melt polymerization process requires strict control of temperature, pressure and reaction time to ensure the smooth progress of the polymerization reaction and the stability of product quality. The melt temperature is precisely controlled and adjusted according to the characteristics of different materials to avoid discoloration of PPS due to excessively high or low temperature. The barrel temperature is gradually lowered, especially the temperature of the first two sections, to reduce the possibility of thermal decomposition and color change. Parameters such as screw speed, back pressure and injection rate are controlled to avoid excessive shear heat, thereby reducing the risk of PPS melt fracture and local burns.

[0113] Cooling and curing:

[0114] After the melt polymerization reaction is completed, the product is rapidly cooled and solidified to keep a stable shape.

[0115] Crushing and screening:

[0116] The cooled and solidified PPS product is crushed and sieved to obtain a granular PPS product that meets the requirements.

[0117] Washing and drying:

[0118] The screened PPS particles are washed to remove surface impurities and residues, and then dried to ensure that the product meets the specified humidity requirements.

[0119] Melt extrusion:

[0120] The produced PPS particles are fed into a melt extruder and, after the steps of melting, extrusion and cooling, are prepared into PPS products with specific shapes and sizes.

[0121] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

[0122] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A polyamide PPS composite material, characterized in that: In parts by weight, it includes the following components: (1) Polyphenylene sulfide (PPS): 23-69.3; (2) Polyamide (PA): 10-30; (3) Glass fiber (GF): 20-40; (4) Heating additive: 0.1-2; (5) Auxiliary additives: 0.1-2.

2. A polyamide PPS composite material according to claim 1, characterized in that: The heating additive (4) is a heat stabilizer and a silane coupling agent.

3. A polyamide PPS composite material according to claim 1, characterized in that: Auxiliary additives (5) are processing lubricants and crystallization accelerators.

4. A method for preparing a polyamide PPS composite material according to any one of claims 1 to 3, characterized in that: The following steps are involved: (6) Raw material selection: The raw materials of PPS mainly include phenylene sulfide monomer and other additives; (7) Raw material pretreatment: pretreatment of selected raw materials; (8) Batching and mixing: Mix the pretreated raw materials, additives and catalysts in a certain proportion to ensure the accurate proportion of each component; (9) Melt polymerization: The mixed raw materials are fed into a polymerization reactor and melt polymerization reaction is carried out under the action of high temperature and catalyst; (10) Cooling and solidification: After the melt polymerization reaction is completed, the product is quickly cooled and solidified to keep it in a stable form; (11) Crushing and screening: crushing and screening the cooled and solidified PPS product to obtain a granular PPS product that meets the requirements; (12) Washing and drying: Wash the screened PPS particles to remove surface impurities and residues, and then dry them to ensure that the product meets the specified humidity requirements; (13) Melt extrusion: After production, the PPS pellets are fed into a melt extruder and, after melting, extrusion and cooling, are prepared into PPS products with specific shapes and sizes.

5. The method for preparing the polyamide PPS composite material according to claim 4, characterized in that: When selecting raw materials (6), it is necessary to ensure that the purity and quality of the raw materials meet production requirements.

6. The method for preparing the polyamide PPS composite material according to claim 4, characterized in that: Raw material pretreatment (7) includes steps such as cleaning, drying and crushing to remove impurities and moisture and improve the uniformity and stability of the raw materials.

7. The method for preparing the polyamide PPS composite material according to claim 4, characterized in that: The melt polymerization (9) process requires strict control of temperature, pressure and reaction time to ensure smooth polymerization and stable product quality.