CN105176079A - Chopped-glass-fiber-reinforced nylon modified material and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of polymer materials, in particular to a chopped glass fiber reinforced nylon modified material and a preparation method thereof. The nylon modified material includes the following raw materials in parts by weight: 50-90 parts of PA resin, chopped glass Fiber 10-50 parts, stabilizer 0.1-0.5 parts and lubricant 0.1-0.5 parts. The nylon modified material of the present invention is modified by adding chopped glass fibers, which improves the heat resistance, dimensional stability, rigidity, and mechanical properties such as tensile strength and bending strength of the nylon modified material. The modified material has good wear resistance, heat resistance, oil resistance and chemical resistance, and greatly reduces the water absorption and shrinkage of the nylon modified material, and has excellent dimensional stability and excellent mechanical strength.

Description

A kind of chopped glass fiber reinforced nylon modified material and preparation method thereof

technical field

The invention relates to the technical field of polymer materials, in particular to a chopped glass fiber reinforced nylon modified material and a preparation method thereof.

Background technique

As an engineering plastic, nylon has its remarkable characteristics compared with other plastics. Nylon is a semi-rigid plastic with tough texture and good mechanical properties, especially impact resistance, which is incomparable to other plastics. It has a low coefficient of friction and low wear, and can be used as a self-lubricating material, so it can be used to make transmission parts. In addition, nylon also has the advantages of excellent chemical corrosion resistance, electrical properties, and convenient molding and processing. However, as a structural part, nylon has high creep, low heat resistance, large shrinkage, and poor dimensional stability, which limits the scope of use of nylon. The use of glass fiber for reinforcement can improve the above shortcomings and expand the scope of use. In general, after glass fiber reinforcement, the tensile strength and bending strength are increased by 2 to 3 times, the rigidity is increased by 2 to 5 times, and the creep value is reduced to a quarter of that of unreinforced.

The physical and mechanical properties of the matrix can be improved by mixing glass fibers with thermoplastic resins. The reinforcing effect mainly depends on the firm bonding between the fiber material and the resin matrix, so that the load on the plastic can be transferred to the high-strength fiber, and the load is transferred from the local Transfer to a larger area or even the entire object. Glass fiber reinforced nylon mainly has two methods: chopped glass fiber reinforced and long glass fiber reinforced. The traditional long glass fiber (LFT) reinforced process is a prepreg process, which is complicated and costly, while chopped glass fiber reinforced nylon The operation is simple, the production efficiency is high, and the performance of the prepared composite material is also better.

In addition, the interfacial bonding between matrix and fiber in composite materials is an important factor affecting the performance of materials. The use of coupling agents can significantly enhance the interfacial bonding between matrix and fiber, which can well improve the physical properties of composite materials.

Contents of the invention

In order to overcome the disadvantages and deficiencies in the prior art, the object of the present invention is to provide a chopped glass fiber reinforced nylon modified material, which is modified by adding chopped glass fiber to improve the nylon modified material. The material's heat resistance, dimensional stability, rigidity, and mechanical properties such as tensile strength and bending strength have been significantly improved, so that the nylon modified material has good wear resistance, heat resistance, oil resistance and chemical resistance. It also greatly reduces the water absorption and shrinkage of nylon modified materials, and has excellent dimensional stability and excellent mechanical strength.

Another object of the present invention is to provide a method for preparing chopped glass fiber reinforced nylon modified material. The preparation method has simple process, convenient operation and control, stable quality, high production efficiency, low production cost, and large-scale industrial production.

The purpose of the present invention is achieved through the following technical solutions: a chopped glass fiber reinforced nylon modified material, the nylon modified material includes the following raw materials in parts by weight:

PA resin 50-90 parts

Chopped glass fiber 10-50 parts

Stabilizer 0.1-0.5 parts

Lubricant 0.1-0.5 parts.

The nylon modified material of the present invention is modified by adding chopped glass fibers, which improves the heat resistance, dimensional stability, rigidity, and mechanical properties such as tensile strength and bending strength of the nylon modified material. The modified material has good wear resistance, heat resistance, oil resistance and chemical resistance, and greatly reduces the water absorption and shrinkage of the nylon modified material, and has excellent dimensional stability and excellent mechanical strength.

Preferably, the PA resin includes at least one of PA6 resin, PA66 resin, PA610 resin and PA1010 resin. More preferably, the PA resin is a mixture of PA66 resin and PA6 resin in a weight ratio of 1-10:1.

In the present invention, PA66 resin and PA6 resin are used as PA resin, and the weight ratio is controlled to be 1-10:1, so that the nylon modified material has excellent mechanical strength, wear resistance, self-lubricating property and corrosion resistance. and good processing performance.

Preferably, the PA66 resin is polyhexamethylene adipate with a density of 1.10-1.14 g/cm ³ , a melting point of 250-254°C, and an average molecular weight of 10,000-100,000.

The present invention uses polyhexamethylene adipate with a density of 1.10-1.14g/cm ³ , a melting point of 250-254°C, and an average molecular weight of 10,000-100,000, so that the nylon modified material has excellent tensile strength, toughness and , Good impact resistance and wear resistance.

Preferably, the PA6 resin is polycaprolactam with a density of 1.14-1.18 g/cm ³ , a melting point of 215-225°C, and an average molecular weight of 10,000-100,000.

The invention uses polycaprolactam with a density of 1.14-1.18g/cm ³ , a melting point of 215-225°C and an average molecular weight of 10,000-100,000 as the PA6 resin, so that the nylon modified material has excellent thermoplasticity, toughness and durability.

Preferably, the chopped glass fiber is an alkali-free chopped glass fiber with a fiber diameter of 5-15 μm and a fiber length of 1-10 mm.

The invention improves the heat resistance, dimensional stability, rigidity, and tensile strength of the nylon modified material by using alkali-free chopped glass fibers with a fiber diameter of 5-15 μm and a fiber length of 1-10 mm as chopped glass fibers. Mechanical properties such as strength and bending strength have been significantly improved, making nylon modified materials have good wear resistance, heat resistance, oil resistance and chemical resistance.

Preferably, the stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide with a melting point of 270-274°C.

The present invention uses N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-phthalamide with a melting point of 270-274°C as a stabilizer, through "Molecular recognition" and cross-link amidation are compatible with nylon, which improves the melt stability of nylon modified materials, thereby improving the processability of nylon modified materials, reducing fiber breakage rate, and improving product quality; Light, heat, oxidation, etc. of the material have long-term stabilizing effects; it can improve the dispersion of fillers and pigments in nylon modified materials.

Preferably, the lubricant includes at least one of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax. More preferably, the lubricant is a mixture composed of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax in a weight ratio of 0.8-1.2:1.6-2.4:1.

The present invention uses modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax as lubricant compound, and controls its weight ratio to be 0.8-1.2:1.6-2.4:1, oxidized polyethylene wax It is an external lubricant that can reduce the friction between the nylon modified material melt and the mold and barrel; modified vinyl bisstearamide and pentaerythritol stearate are internal lubricants that can reduce the molecular weight of the nylon modified material melt Inter-friction; the mixed use of the three lubricants can improve the fluidity of the nylon modified material during processing and the mold release of the product.

Preferably, the pentaerythritol stearate is composed of pentaerythritol tristearate with a hydroxyl value of 55-65 mgKOH/g and a melting point of 50-60° C. and a hydroxyl value of 25-35 mgKOH/g and a melting point of 55-65° C. A mixture of pentaerythritol tetrastearate in a weight ratio of 2-3:1.

The present invention uses pentaerythritol tristearate at 55-65mgKOH/g and melting point at 50-60°C and pentaerythritol tetrastearate at 25-35mgKOH/g and melting point at 55-65°C as Pentaerythritol stearate is used in combination, and its weight ratio is controlled to 2-3:1. It has good thermal stability and low volatility, good mold release and flow properties, and can significantly improve the performance of nylon modified materials at high temperatures. Excellent processing performance, improve the transparency and surface finish of the product.

The nylon modified material also includes 3-7 parts of modified POE resin, 1-5 parts of antistatic agent, 0.5-1.5 parts of antioxidant, 1-5 parts of strength modifier, 1-5 parts of toughening modifier parts, impact modifier 1-5 parts.

The modified POE resin is a polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin; the ethylene-octene copolymer is ethylene with an octene monomer content of 20%-30%. - Octene copolymer.

The invention adopts the polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin as the modified POE resin, which can significantly improve the impact toughness at room temperature and low temperature of the material. The invention adopts the ethylene-octene copolymer with the octene monomer content of 20%-30%, which can significantly improve the impact strength and heat resistance of the material, and the main mechanical properties such as tensile strength and tear strength are all greatly improved.

The polypropylene is a mixture of copolymerized polypropylene and homopolypropylene at a weight ratio of 1.4-2.2:1; the copolymerized polypropylene is a copolymerized polypropylene with a melt index of 10-50 g/10min; the homopolymerized polypropylene Propylene is homopolypropylene with a melt index of 60-100g/10min.

In the present invention, the copolymerized polypropylene with a melt index of 10-50g/10min and the homopolypropylene with a melt index of 60-100g/10min are used as polypropylene, and the weight ratio is controlled to be 1.4-2.2:1, which can Significantly improve the impact strength and heat deflection temperature of the material.

The antistatic agent is a mixture of carbon black and carbon fiber in a weight ratio of 1:1.4-2.2.

In the present invention, carbon black and carbon fiber are used as antistatic agents, and the weight ratio is controlled to be 1:1.4-2.2, so that the surface resistivity of the modified material reaches 5-7 orders of magnitude, while maintaining the impact resistance of the material. On the basis of this, it can significantly improve the antistatic performance of the material.

The carbon black is carbon black with a specific surface area of 80-140m ³ /g and a particle size of 8-12nm; the carbon fiber is carbon fiber with an aspect ratio of 400-600.

The invention can remarkably improve the antistatic property of the material by adopting the carbon black with a specific surface area of 80-140m ³ /g and a particle diameter of 8-12nm. The invention can remarkably improve the antistatic performance of the material by adopting the carbon fiber with an aspect ratio of 400-600.

The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1-2.

In the present invention, antioxidant 1010 and antioxidant 168 are used as antioxidant compounds, and their weight ratio is controlled to be 1:1-2. Both antioxidants are environmentally friendly antioxidants and have a certain synergistic effect , can delay or inhibit the oxidation process of the material, thereby preventing the aging of the material and prolonging its service life.

The strength modifier is a mixture composed of basalt fibers with a single-filament diameter of 4-8 μm and magnesium salt whiskers with a single-filament diameter of 6-10 μm at a weight ratio of 1.6-2.4:1.

Basalt fiber is a continuous fiber drawn at high speed by a platinum-rhodium alloy drawing bushing after melting basalt rock at 1450°C to 1500°C. Similar to glass fiber, its performance is between high-strength S glass fiber and alkali-free E glass fiber. Basalt continuous fiber not only has good stability, but also has many excellent properties such as electrical insulation, corrosion resistance, combustion resistance, and high temperature resistance. performance. Basalt rock is used as the strength modifier, which has the advantages of high strength, high impact strength and excellent temperature resistance compared with glass fiber.

Magnesium salt whiskers have a single-whisker fiber structure with a diameter in the range of nanometers. Magnesium salt whiskers have high physical and mechanical properties, and can enhance the strength of nylon materials after being added; Capacitance is good, the surface of the prepared nylon product has strong scratch resistance, stable size, not easy to warp and deform, and can improve the anti-aging performance of nylon product.

The present invention uses basalt fiber and magnesium salt whisker as a strength modifier and controls their weight ratio to be 1.6-2.4:1, which can significantly improve the strength of the nylon material.

The toughening modifier is vinyl elastomer double-grafted with maleic anhydride and methyl methacrylate.

The invention can remarkably improve the toughness and impact strength of the material by using the vinyl elastomer double-grafted by maleic anhydride and methyl methacrylate as the toughening modifier.

The impact modifier is a polyester thermoplastic polyurethane elastomer with a molecular weight of 40,000-80,000.

Polyester thermoplastic polyurethane elastomer has excellent wear resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low temperature resistance, good oil resistance, chemical resistance and environmental resistance.

The invention adopts the polyester thermoplastic polyurethane elastomer with a molecular weight of 40,000-80,000 as the impact modifier, which can improve the impact resistance of the material, reduce the melt viscosity of the material, improve the fluidity, and improve the processing performance of the plastic. Improve corrosion resistance, rigidity, flame retardancy, electrical insulation, heat resistance and formability of materials.

Another object of the present invention is achieved through the following technical solutions: a preparation method of chopped glass fiber reinforced nylon modified material, comprising the steps of:

(1) Weigh the raw materials except chopped glass fiber according to the weight ratio, add them to the high-speed mixer and mix them for 5-10 minutes to obtain the mixture;

(2) Add the mixture obtained by blending in step (1) to the extruder for extrusion, weigh the chopped glass fiber according to the weight ratio and add it from the side feeding port of the extruder;

(3) cooling, pelletizing and screening the material extruded in step (2) to obtain the nylon modified material;

In the step (2), the process parameters of the extruder are: the temperature of the first zone is 210-250°C, the temperature of the second zone is 210-250°C, the temperature of the third zone is 210-250°C, the temperature of the fourth zone is 210-250°C, and the temperature of the fifth zone is 210-250°C. The temperature is 210-250℃, the temperature in the sixth zone is 210-250℃, the temperature in the seventh zone is 210-240℃, the temperature in the eighth zone is 210-240℃, the temperature in the ninth zone is 210-240℃, the temperature of the die head is 210-230℃, the pressure is 18-23Mpa , screw speed 350-450r/min.

The preparation method of the invention has the advantages of simple process, convenient operation and control, stable quality, high production efficiency, low production cost and large-scale industrial production.

The beneficial effect of the present invention is that: the nylon modified material of the present invention is modified by adding chopped glass fibers, which improves the heat resistance, dimensional stability, rigidity, and mechanical properties such as tensile strength and bending strength of the nylon modified material. The performance has been significantly improved, so that the nylon modified material has good wear resistance, heat resistance, oil resistance and chemical resistance, and also greatly reduces the water absorption and shrinkage of the nylon modified material, and has excellent dimensional stability. and excellent mechanical strength.

The preparation method of the invention has the advantages of simple process, convenient operation and control, stable quality, high production efficiency, low production cost and large-scale industrial production.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the examples, and the contents mentioned in the embodiments are not intended to limit the present invention.

Example 1

A chopped glass fiber reinforced nylon modified material, the nylon modified material includes the following raw materials in parts by weight:

PA resin 50 parts

10 parts chopped glass fiber

Stabilizer 0.1 part

Lubricant 0.1 part.

The PA resin is a mixture of PA66 resin and PA6 resin with a weight ratio of 1:1.

The PA66 resin is polyhexamethylene adipate with a density of 1.10 g/cm ³ , a melting point of 250° C. and an average molecular weight of 10,000.

The PA6 resin is polycaprolactam with a density of 1.14g/cm ³ , a melting point of 215°C and an average molecular weight of 10,000.

The chopped glass fiber is an alkali-free chopped glass fiber with a fiber diameter of 5 μm and a fiber length of 1 mm.

The stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide with a melting point of 270°C.

The lubricant is a mixture composed of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax in a weight ratio of 0.8:1.6:1.

Described pentaerythritol stearate is at 55mgKOH/g, the pentaerythritol tristearate of fusing point at 50 ℃ and the pentaerythritol tetrastearate at 55 ℃ with hydroxyl value at 25mgKOH/g, fusing point in weight ratio 2 : 1 composition of the mixture.

A preparation method of chopped glass fiber reinforced nylon modified material, comprising the steps of:

(1) Weigh the raw materials except chopped glass fiber according to the weight ratio, add them to the high-speed mixer and mix them for 5 minutes to obtain the mixture;

(2) Add the mixture obtained by blending in step (1) to the extruder for extrusion, weigh the chopped glass fiber according to the weight ratio and add it from the side feeding port of the extruder;

(3) cooling, pelletizing and screening the material extruded in step (2) to obtain the nylon modified material;

In the step (2), the process parameters of the twin-screw extruder are: the temperature of the first zone is 210°C, the temperature of the second zone is 210°C, the temperature of the third zone is 210°C, the temperature of the fourth zone is 210°C, the temperature of the fifth zone is 210°C, and the temperature of the sixth zone is 210°C. The temperature is 210°C, the temperature of the seventh zone is 210°C, the temperature of the eighth zone is 210°C, the temperature of the ninth zone is 210°C, the temperature of the die head is 210°C, the pressure is 18Mpa, and the screw speed is 350r/min.

Example 2

A chopped glass fiber reinforced nylon modified material, the nylon modified material includes the following raw materials in parts by weight:

PA resin 60 parts

20 parts chopped glass fiber

Stabilizer 0.2 parts

0.2 parts of lubricant.

The PA resin is a mixture of PA66 resin and PA6 resin in a weight ratio of 3:1.

The PA66 resin is polyhexamethylene adipate with a density of 1.11 g/cm ³ , a melting point of 251° C. and an average molecular weight of 30,000.

The PA6 resin is polycaprolactam with a density of 1.15g/cm ³ , a melting point of 218°C and an average molecular weight of 30,000.

The chopped glass fiber is an alkali-free chopped glass fiber with a fiber diameter of 8 μm and a fiber length of 3 mm.

The stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide with a melting point of 271°C.

The lubricant is a mixture composed of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax in a weight ratio of 0.9:1.8:1.

Described pentaerythritol stearate is by the pentaerythritol tristearate and hydroxyl value at 28mgKOH/g, the pentaerythritol tetrastearate of melting point at 52 ℃ by weight ratio 2.2 at 58mgKOH/g, fusing point. : 1 composition of the mixture.

A preparation method of chopped glass fiber reinforced nylon modified material, comprising the steps of:

(1) Weigh the raw materials except chopped glass fiber according to the weight ratio, add them to the high-speed mixer and mix them for 6 minutes to obtain the mixture;

(2) Add the mixture obtained by blending in step (1) to the extruder for extrusion, weigh the chopped glass fiber according to the weight ratio and add it from the side feeding port of the extruder;

(3) cooling, pelletizing and screening the material extruded in step (2) to obtain the nylon modified material;

In the step (2), the process parameters of the twin-screw extruder are: the temperature of the first zone is 220°C, the temperature of the second zone is 220°C, the temperature of the third zone is 220°C, the temperature of the fourth zone is 220°C, the temperature of the fifth zone is 220°C, and the temperature of the sixth zone is 220°C. The temperature is 220°C, the temperature in the seventh zone is 218°C, the temperature in the eighth zone is 218°C, the temperature in the ninth zone is 218°C, the temperature of the die head is 215°C, the pressure is 20Mpa, and the screw speed is 380r/min.

Example 3

A chopped glass fiber reinforced nylon modified material, the nylon modified material includes the following raw materials in parts by weight:

PA resin 70 parts

Chopped glass fiber 30 parts

Stabilizer 0.3 parts

0.3 parts of lubricant.

The PA resin is a mixture of PA66 resin and PA6 resin in a weight ratio of 5:1.

The PA66 resin is polyhexamethylene adipate with a density of 1.12 g/cm ³ , a melting point of 252° C. and an average molecular weight of 50,000.

The PA6 resin is polycaprolactam with a density of 1.16 g/cm ³ , a melting point of 220° C. and an average molecular weight of 50,000.

The chopped glass fiber is an alkali-free chopped glass fiber with a fiber diameter of 10 μm and a fiber length of 5 mm.

The stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide with a melting point of 272°C.

The lubricant is a mixture composed of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax in a weight ratio of 1:2:1.

Described pentaerythritol stearate is at 60mgKOH/g, the pentaerythritol tristearate of fusing point at 55 ℃ and the pentaerythritol tetrastearate at 60 ℃ with hydroxyl value at 30mgKOH/g, fusing point in weight ratio 2.5 : 1 composition of the mixture.

A preparation method of chopped glass fiber reinforced nylon modified material, comprising the steps of:

(1) Weigh the raw materials except chopped glass fiber according to the weight ratio, add them to the high-speed mixer and mix them for 8 minutes to obtain the mixture;

(2) Add the mixture obtained by blending in step (1) to the extruder for extrusion, weigh the chopped glass fiber according to the weight ratio and add it from the side feeding port of the extruder;

(3) cooling, pelletizing and screening the material extruded in step (2) to obtain the nylon modified material;

In the step (2), the process parameters of the twin-screw extruder are: the temperature of the first zone is 230°C, the temperature of the second zone is 230°C, the temperature of the third zone is 230°C, the temperature of the fourth zone is 230°C, the temperature of the fifth zone is 230°C, and the temperature of the sixth zone is 230°C. The temperature is 230°C, the temperature in the seventh zone is 225°C, the temperature in the eighth zone is 225°C, the temperature in the ninth zone is 225°C, the temperature of the die head is 2120°C, the pressure is 20Mpa, and the screw speed is 400r/min.

Example 4

A chopped glass fiber reinforced nylon modified material, the nylon modified material includes the following raw materials in parts by weight:

PA resin 80 parts

Chopped glass fiber 40 parts

Stabilizer 0.4 parts

0.4 parts of lubricant.

The PA resin is a mixture of PA66 resin and PA6 resin in a weight ratio of 8:1.

The PA66 resin is polyhexamethylene adipate with a density of 1.13 g/cm ³ , a melting point of 253° C. and an average molecular weight of 80,000.

The PA6 resin is polycaprolactam with a density of 1.17g/cm ³ , a melting point of 222°C and an average molecular weight of 80,000.

The chopped glass fiber is an alkali-free chopped glass fiber with a fiber diameter of 12 μm and a fiber length of 8 mm.

The stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide with a melting point of 273°C.

The lubricant is a mixture composed of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax in a weight ratio of 1.1:2.2:1.

Described pentaerythritol stearate is by the pentaerythritol tristearate and hydroxyl value at 32mgKOH/g, the pentaerythritol tetrastearate of melting point at 58 ℃ by weight ratio 2.8 at 62mgKOH/g, fusing point. : 1 composition of the mixture.

A preparation method of chopped glass fiber reinforced nylon modified material, comprising the steps of:

(1) Weigh the raw materials except chopped glass fiber according to the weight ratio, add them to the high-speed mixer and blend for 9 minutes to obtain the mixture;

(2) Add the mixture obtained by blending in step (1) to the extruder for extrusion, weigh the chopped glass fiber according to the weight ratio and add it from the side feeding port of the extruder;

(3) cooling, pelletizing and screening the material extruded in step (2) to obtain the nylon modified material;

In the step (2), the process parameters of the twin-screw extruder are: the temperature of the first zone is 240°C, the temperature of the second zone is 240°C, the temperature of the third zone is 240°C, the temperature of the fourth zone is 240°C, the temperature of the fifth zone is 240°C, and the temperature of the sixth zone is 240°C. The temperature is 240°C, the temperature in the seventh zone is 232°C, the temperature in the eighth zone is 232°C, the temperature in the ninth zone is 232°C, the temperature of the die head is 225°C, the pressure is 22Mpa, and the screw speed is 420r/min.

Example 5

A chopped glass fiber reinforced nylon modified material, the nylon modified material includes the following raw materials in parts by weight:

PA resin 90 parts

Chopped glass fiber 50 parts

Stabilizer 0.5 parts

0.5 parts of lubricant.

The PA resin is a mixture of PA66 resin and PA6 resin with a weight ratio of 10:1.

The PA66 resin is polyhexamethylene adipate with a density of 1.14 g/cm ³ , a melting point of 254° C. and an average molecular weight of 100,000.

The PA6 resin is polycaprolactam with a density of 1.18g/cm ³ , a melting point of 225°C and an average molecular weight of 100,000.

The chopped glass fiber is an alkali-free chopped glass fiber with a fiber diameter of 15 μm and a fiber length of 10 mm.

The stabilizer is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide with a melting point of 274°C.

The lubricant is a mixture composed of modified vinyl bis stearamide, pentaerythritol stearate and oxidized polyethylene wax in a weight ratio of 1.2:2.4:1.

Described pentaerythritol stearate is at 65mgKOH/g, the pentaerythritol tristearate of fusing point at 60 ℃ and the pentaerythritol tetrastearate at 65 ℃ with hydroxyl value at 35mgKOH/g, fusing point in weight ratio 3 : 1 composition of the mixture.

A preparation method of chopped glass fiber reinforced nylon modified material, comprising the steps of:

(1) Weigh the raw materials other than chopped glass fiber according to the weight ratio, add them to the high-speed mixer and mix them for 10 minutes to obtain the mixture;

(2) Add the mixture obtained by blending in step (1) to the extruder for extrusion, weigh the chopped glass fiber according to the weight ratio and add it from the side feeding port of the extruder;

(3) cooling, pelletizing and screening the material extruded in step (2) to obtain the nylon modified material;

In the step (2), the process parameters of the twin-screw extruder are: the temperature of the first zone is 250°C, the temperature of the second zone is 250°C, the temperature of the third zone is 250°C, the temperature of the fourth zone is 250°C, the temperature of the fifth zone is 250°C, and the temperature of the sixth zone is 250°C. The temperature is 250°C, the temperature of the seventh zone is 240°C, the temperature of the eighth zone is 240°C, the temperature of the ninth zone is 240°C, the temperature of the die head is 230°C, the pressure is 23Mpa, and the screw speed is 450r/min.

Example 6

The difference between this embodiment and above-mentioned embodiment 1 is:

The nylon modified material also includes 3 parts of modified POE resin, 1 part of antistatic agent, 0.5 part of antioxidant, 1 part of strength modifier, 1 part of toughening modifier and 1 part of impact modifier.

The modified POE resin is a polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin; the ethylene-octene copolymer is an ethylene-octene copolymer with an octene monomer content of 20%. copolymer.

The polypropylene is a mixture of copolymerized polypropylene and homopolypropylene with a weight ratio of 1.4:1; the copolymerized polypropylene is a copolymerized polypropylene with a melt index of 10g/10min; the homopolymerized polypropylene is a melt index Homopolypropylene at 60g/10min.

The antistatic agent is a mixture of carbon black and carbon fiber in a weight ratio of 1:1.4.

The carbon black is a carbon black with a specific surface area of 800m ³ /g and a particle size of 8nm; the carbon fiber is a carbon fiber with an aspect ratio of 400.

The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.

The strength modifier is a mixture composed of basalt fibers with a single-filament diameter of 4 μm and magnesium salt whiskers with a single-filament diameter of 6 μm at a weight ratio of 1.6:1.

The toughening modifier is vinyl elastomer double-grafted with maleic anhydride and methyl methacrylate.

The impact modifier is a polyester thermoplastic polyurethane elastomer with a molecular weight of 40,000.

Example 7

The difference between this embodiment and above-mentioned embodiment 2 is:

The nylon modified material also includes 4 parts of modified POE resin, 2 parts of antistatic agent, 0.8 parts of antioxidant, 2 parts of strength modifier, 2 parts of toughening modifier and 2 parts of impact modifier.

The modified POE resin is a polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin; the ethylene-octene copolymer is ethylene-octene with an octene monomer content of 22%. copolymer.

The polypropylene is a mixture of copolymerized polypropylene and homopolypropylene with a weight ratio of 1.6:1; the copolymerized polypropylene is a copolymerized polypropylene with a melt index of 20g/10min; the homopolymerized polypropylene is a melt index Homopolypropylene at 70g/10min.

The antistatic agent is a mixture of carbon black and carbon fiber in a weight ratio of 1:1.6.

The carbon black is carbon black with a specific surface area of 100m ³ /g and a particle size of 9nm; the carbon fiber is a carbon fiber with an aspect ratio of 450.

The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.2.

The strength modifier is a mixture composed of basalt fibers with a single-filament diameter of 4-8 μm and magnesium salt whiskers with a single-filament diameter of 7 μm at a weight ratio of 1.8:1.

The toughening modifier is vinyl elastomer double-grafted with maleic anhydride and methyl methacrylate.

The impact modifier is a polyester thermoplastic polyurethane elastomer with a molecular weight of 50,000.

Example 8

The difference between this embodiment and above-mentioned embodiment 3 is:

The nylon modified material also includes 5 parts of modified POE resin, 3 parts of antistatic agent, 1 part of antioxidant, 3 parts of strength modifier, 3 parts of toughening modifier and 3 parts of impact modifier.

The modified POE resin is a polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin; the ethylene-octene copolymer is an ethylene-octene copolymer with an octene monomer content of 25%. copolymer.

The polypropylene is a mixture of copolymerized polypropylene and homopolypropylene with a weight ratio of 1.8:1; the copolymerized polypropylene is a copolymerized polypropylene with a melt index of 30g/10min; the homopolymerized polypropylene is a melt index Homopolypropylene at 80g/10min.

The antistatic agent is a mixture of carbon black and carbon fiber in a weight ratio of 1:1.8.

The carbon black is a carbon black with a specific surface area of 110m ³ /g and a particle size of 10nm; the carbon fiber is a carbon fiber with an aspect ratio of 500.

The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.5.

The strength modifier is a mixture composed of basalt fibers with a single-filament diameter of 6 μm and magnesium salt whiskers with a single-filament diameter of 8 μm at a weight ratio of 2:1.

The toughening modifier is vinyl elastomer double-grafted with maleic anhydride and methyl methacrylate.

The impact modifier is a polyester thermoplastic polyurethane elastomer with a molecular weight of 60,000.

Example 9

The difference between this embodiment and above-mentioned embodiment 4 is:

The nylon modified material also includes 6 parts of modified POE resin, 4 parts of antistatic agent, 1.2 parts of antioxidant, 4 parts of strength modifier, 4 parts of toughening modifier and 4 parts of impact modifier.

The modified POE resin is a polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin; the ethylene-octene copolymer is ethylene-octene with an octene monomer content of 28%. copolymer.

The polypropylene is a mixture of copolymerized polypropylene and homopolypropylene at a weight ratio of 2:1; the copolymerized polypropylene is a copolymerized polypropylene with a melt index of 40 g/10min; the homopolymerized polypropylene is a melt index Homopolypropylene at 90g/10min.

The antistatic agent is a mixture of carbon black and carbon fiber in a weight ratio of 1:2.

The carbon black is a carbon black with a specific surface area of 120m ³ /g and a particle size of 11nm; the carbon fiber is a carbon fiber with an aspect ratio of 550.

The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1.8.

The strength modifier is a mixture composed of basalt fibers with a single-filament diameter of 7 μm and magnesium salt whiskers with a single-filament diameter of 9 μm at a weight ratio of 2.2:1.

The toughening modifier is vinyl elastomer double-grafted with maleic anhydride and methyl methacrylate.

The impact modifier is a polyester thermoplastic polyurethane elastomer with a molecular weight of 70,000.

Example 10

The difference between this embodiment and above-mentioned embodiment 5 is:

The nylon modified material also includes 7 parts of modified POE resin, 5 parts of antistatic agent, 1.5 parts of antioxidant, 5 parts of strength modifier, 5 parts of toughening modifier and 5 parts of impact modifier.

The modified POE resin is a polypropylene/ethylene-octene copolymer obtained by blending and modifying polypropylene and POE resin; the ethylene-octene copolymer is an ethylene-octene copolymer with an octene monomer content of 30%. copolymer.

The polypropylene is a mixture of copolymerized polypropylene and homopolypropylene with a weight ratio of 2.2:1; the copolymerized polypropylene is a copolymerized polypropylene with a melt index of 50 g/10min; the homopolymerized polypropylene is a melt index Homopolypropylene at 100g/10min.

The antistatic agent is a mixture of carbon black and carbon fiber in a weight ratio of 1:2.2.

The carbon black is carbon black with a specific surface area of 140m ³ /g and a particle size of 12nm; the carbon fiber is a carbon fiber with an aspect ratio of 600.

The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:2.

The strength modifier is a mixture composed of basalt fibers with a single-filament diameter of 8 μm and magnesium salt whiskers with a single-filament diameter of 10 μm at a weight ratio of 2.4:1.

The toughening modifier is vinyl elastomer double-grafted with maleic anhydride and methyl methacrylate.

The impact modifier is a polyester thermoplastic polyurethane elastomer with a molecular weight of 80,000.

The mechanical and physical properties of the chopped glass fiber reinforced nylon modified material prepared in Examples 1-10 are shown in Table 1.

Table 1

Test items Example 1 Example 2 Example 3 Example 4 Example 5 Notched impact strength (KJ/m ² ) 16 18 20 19 17 Tensile strength (MPa) 190 195 200 192 188 Bending strength (MPa) 270 275 280 278 272 Flexural modulus (MPa) 7500 8000 8500 8200 7800 Heat distortion temperature (°C) 153 162 165 158 152 Test items Example 6 Example 7 Example 8 Example 9 Example 10 Notched impact strength (KJ/m ² ) 17 19 twenty two 20 18 Tensile strength (MPa) 209 214 220 211 206 Bending strength (MPa) 297 302 308 305 299 Flexural modulus (MPa) 8250 8800 9350 9020 8580 Heat distortion temperature (°C) 168 178 181 173 167

As can be seen from Table 1, the chopped glass fiber reinforced nylon modified material prepared by the present invention has improved the heat resistance of the nylon modified material by adding chopped glass fiber, dimensional stability, rigidity, and tensile strength and bending The strength and other mechanical properties have been significantly improved, so that the nylon modified material has good wear resistance, heat resistance, oil resistance and chemical resistance, and it also greatly reduces the water absorption and shrinkage of the nylon modified material. Dimensional stability and excellent mechanical strength.

The above-mentioned embodiments are preferred implementation solutions of the present invention. In addition, the present invention can also be realized in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the present invention.

Claims (10)

1. a short glass fiber Reinforced Nylon is material modified, it is characterized in that: described modified nylon material comprises the raw material of following weight part:

PA resin 50-90 part

Short glass fiber 10-50 part

Stablizer 0.1-0.5 part

Lubricant 0.1-0.5 part.

2. a kind of short glass fiber Reinforced Nylon according to claim 1 is material modified, it is characterized in that: described PA resin comprises at least one in PA6 resin, PA66 resin, PA610 resin and PA1010 resin.

3. a kind of short glass fiber Reinforced Nylon according to claim 2 is material modified, it is characterized in that: the mixture that described PA resin is made up of with weight ratio 1-10:1 PA66 resin and PA6 resin.

4. a kind of short glass fiber Reinforced Nylon according to claim 2 is material modified, it is characterized in that: described PA66 resin be density 1.10-1.14g/cm3, fusing point 250-254 DEG C, molecular-weight average is 10,000-100, the PA 66 of 000.

5. a kind of short glass fiber Reinforced Nylon according to claim 2 is material modified, it is characterized in that: described PA6 resin be density 1.14-1.18g/cm3, fusing point 215-225 DEG C, molecular-weight average at 10,000-100, the polycaprolactam of 000.

6. a kind of short glass fiber Reinforced Nylon according to claim 1 is material modified, it is characterized in that: described short glass fiber be Fibre diameter 5-15 μm, staple length is at the alkali-free short glass fiber of 1-10mm.

7. a kind of short glass fiber Reinforced Nylon according to claim 1 is material modified, it is characterized in that: described stablizer is fusing point at the N of 270-274 DEG C, N '-bis-(2,2,6,6-tetramethyl--4-piperidyl)-1,3-benzenedicarboxamide.

8. a kind of short glass fiber Reinforced Nylon according to claim 1 is material modified, it is characterized in that: described lubricant comprises at least one in modified vinyl bis-stearamides, pentaerythritol stearate and oxidized polyethlene wax.

9. a kind of short glass fiber Reinforced Nylon according to claim 8 is material modified, it is characterized in that: the mixture that described pentaerythritol stearate is made up of with weight ratio 2-3:1 at the pentaerythritol tetrastearate of 55-65 DEG C at 25-35mgKOH/g, fusing point in the tetramethylolmethane tristearate of 50-60 DEG C and hydroxyl value at 55-65mgKOH/g, fusing point hydroxyl value.

10. the preparation method that a kind of short glass fiber Reinforced Nylon as described in any one of claim 1-9 is material modified, is characterized in that: comprise the steps:

(1) take the raw material except short glass fiber by weight ratio, join blended 5-10min in high speed mixer, obtain mixture;

(2) blended for step (1) mixture obtained is joined forcing machine to extrude, take short glass fiber by weight ratio and add from the side spout of forcing machine;

(3) material after step (2) being extruded, through cooling, pelletizing and screening, obtains described modified nylon material;

In described step (2), the processing parameter of forcing machine is: a district temperature 210-250 DEG C, two district temperature 210-250 DEG C, three district temperature 210-250 DEG C, four district temperature 210-250 DEG C, five district temperature 210-250 DEG C, six district temperature 210-250 DEG C, seven district temperature 210-240 DEG C, eight district temperature 210-240 DEG C, nine district temperature 210-240 DEG C, die head temperature 210-230 DEG C, pressure 18-23Mpa, screw speed 350-450r/min.