CN103571186A - Waste CFRP (carbon fiber reinforced plastic) powder reinforced nylon composition and preparation method of nylon composition - Google Patents

Abstract

The invention relates to a waste carbon fiber composite material powder reinforced nylon composition and a preparation method thereof, comprising the following steps: (1) crushing the waste CFRP material and sieving to obtain waste CFRP powder with uniform particle size; (2) according to the above Proportioning, weigh 5-40 parts of waste CFRP powder and dry it in a high mixer, then add 0.1-3 parts of surface treatment agent to treat the surface of CFRP powder; (3) weigh 60-95 parts of nylon according to the proportion , 0.1-0.6 parts of lubricant, 0.1-0.5 parts of antioxidant in a high mixer, and mix well; (4) Add the uniformly mixed raw materials in step (3) to a twin-screw machine for melt blending, extrusion, and water cooling , the strands were cut into pellets to obtain a waste CFRP-reinforced nylon composition. Compared with the prior art, the composition of the invention has low density, reduces its pollution to the environment, increases its added value, saves resources and protects the environment.

Description

Waste carbon fiber composite material powder reinforced nylon composition and preparation method thereof

technical field

The invention belongs to the technical field of polymer material recovery, and in particular relates to a waste carbon fiber composite material powder reinforced nylon composition and a preparation method thereof.

Background technique

Carbon fiber composite materials (CFRP) have excellent properties such as light weight, high strength, and high modulus, which are unmatched by other glass fiber reinforced composite materials, so they are widely used in aerospace, automotive industry, rail transit, new energy , sporting goods and other high-tech industries. With the rapid development of the economy, the use of CFRP in various fields is increasing rapidly, and the waste resin produced is also increasing day by day, and the components in the waste CFRP are not degradable. If they are directly discarded into the environment, on the one hand, it will bring environmental harm On the other hand, these waste CFRP often contain about 60% of high value-added carbon fiber, and the production of carbon fiber is a high energy-consuming process, if it is not recycled, it will cause a serious waste of resources.

As an engineering plastic, nylon has good elasticity, good mechanical properties, wear resistance, oil resistance and good processing performance, so it is widely used in automobiles, home appliances, electronic appliances, machinery and other fields. However, nylon is prone to embrittlement during use, poor impact resistance, high water absorption, low heat resistance and low strength. In order to improve these properties of nylon, the commonly used method is to use glass fiber or inorganic fillers such as carbonic acid Calcium, talc, etc. to fill the modified nylon. However, the density of glass fiber or inorganic filler is relatively high, and the density of the composition obtained after filling modified nylon will also increase significantly, which will lead to a decline in the market competitiveness of the product. At the same time, due to the performance limitations of glass fiber or inorganic filler, glass fiber Or the performance of nylon modified by inorganic fillers is limited, and the application in some occasions with high performance requirements will be limited.

Contents of the invention

The object of the present invention is to provide a waste carbon fiber composite material powder reinforced nylon composition with low cost and less pollution and a preparation method thereof in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions: a waste carbon fiber composite material powder reinforced nylon composition, characterized in that the composition comprises the following components by weight:

The nylon is one or more of nylon 6 (PA6), nylon 66 (PA66), nylon 11 (PA11), nylon 12 (PA12), nylon 1010 (PA1010), and nylon 610T (PA610T).

The waste CFRP powder is obtained by crushing waste CFRP materials, and the crushed particle size is preferably between 40-400 mesh.

Since the main components of waste CFRP powder are carbon fiber and resin matrix, the resin matrix is mostly thermosetting resin, which has poor affinity with nylon surface, so the two are often incompatible. Surface treatment agent is used to treat waste CFRP powder. It can improve its surface affinity and improve its compatibility with filled resins.

The surface treatment agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent.

The lubricant is one or more of stearic acid, zinc stearate, calcium stearate, polyethylene wax, white oil, ethylene bisstearamide (EBS), and erucamide.

The antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 1098, and antioxidant 168.

A preparation method of waste carbon fiber composite material powder reinforced nylon composition, characterized in that it comprises the following steps:

(1) Crushing and sieving waste CFRP materials to obtain waste CFRP powders with uniform particle size;

(2) According to the above ratio, weigh 5-40 parts of waste CFRP powder and dry it in a high mixer, and then add 0.1-3 parts of surface treatment agent to treat the surface of CFRP powder;

(3) Take by weighing 60-95 parts of nylon, 0.1-0.6 parts of lubricant, and 0.1-0.5 parts of antioxidant in a high-mixer, and mix evenly;

(4) Add the homogeneously mixed raw materials in step (3) into a twin-screw machine for melt blending, extrusion, water cooling, strand cutting and pelletizing to obtain a waste CFRP reinforced nylon composition.

The drying temperature of the high mixer in the step (2) is 80-120°C, and the drying time is 10-30min.

The twin-screw extruder in the step (4) is a co-rotating or counter-rotating twin-screw extruder, the extruder temperature is 190-290°C, the screw speed is 150-400rpm, and the screw length-to-diameter ratio L/D is 30-50:1.

One of the objectives of the present invention is to provide a waste carbon fiber composite material powder reinforced nylon composition, which uses recycled waste carbon fiber composite material powder as a reinforcement modification component, and realizes high performance to nylon at a lower cost Modification, the density of the obtained composition is also low; at the same time, the composition enables the waste CFRP material to be reused, reduces its pollution to the environment, increases its added value, saves resources, and protects the environment.

Another object of the present invention is to provide a method for preparing the above-mentioned waste carbon fiber composite material powder reinforced nylon composition, which is simple in processing and operation.

Compared with the prior art, the composition of the present invention adopts recycled waste carbon fiber composite material powder as a reinforcing modification component, and realizes high-performance modification of nylon at a lower cost, and the obtained waste CFRP composite material powder reinforces nylon The composition has low density and excellent mechanical properties. Recycled waste CFRP composite powder is used as the reinforcing modification component to achieve high-performance modification of nylon at a lower cost; at the same time, the composition enables waste CFRP materials to be regenerated Utilization reduces its pollution to the environment, increases its added value, saves resources, and protects the environment; the obtained composition can be widely used in product parts such as automobiles, electronic appliances, home appliances, and machinery.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments.

In the following examples, the tensile performance test standard is ASTM D638, the bending performance test standard is ASTM D790, and the Izod notched impact strength test standard is ASTM D256.

Example 1

(1) Crushing waste CFRP materials and sieving to obtain 400-mesh waste CFRP powder.

(2) Weigh 20 parts of waste CFRP powder and dry it in a high mixer at 100°C for 20 min, then add 0.1 part of silane coupling agent KH550 to surface treat the waste CFRP powder.

(3) Weigh 80 parts of PA66, 0.1 part of calcium stearate, 0.3 part of antioxidant 1010, and 0.1 part of antioxidant 168, and mix them uniformly in a high mixer.

(4) Add the uniformly mixed raw materials into the twin-screw extruder, melt and blend, extrude, and pelletize the strands to obtain the required waste CFRP powder reinforced nylon composition. The temperature in each zone of the twin-screw extruder is: Zone 1 220°C, 230°C in zone 2, 240°C in zone 3, 250°C in zone 4, 260°C in zone 5, 270°C in zone 6, 280°C in zone 7, 280°C in zone 8, 290°C in zone 9, 290°C in zone 10, machine head 285°C; screw speed 350rpm, aspect ratio L/D=30/1.

Example 2

(1) Crushing waste CFRP materials and sieving to obtain 200-mesh waste CFRP powder.

(2) Weigh 10 parts of waste CFRP powder and dry it in a high mixer at 80°C for 30 minutes, then add 1 part of silane coupling agent KH560 to surface treat the waste CFRP powder.

(3) Weigh 90 parts of PA12, 0.3 part of EBS, 0.1 part of anti-1076, 0.1 part of anti-168 and mix them evenly in a high mixer.

(4) Add the uniformly mixed raw materials into the twin-screw extruder, melt and blend, extrude, and pelletize the strands to obtain the required waste CFRP powder reinforced nylon composition. The temperature in each zone of the twin-screw extruder is: Zone 1 220°C, 230°C in zone 2, 240°C in zone 3, 250°C in zone 4, 260°C in zone 5, 270°C in zone 6, 280°C in zone 7, 280°C in zone 8, 290°C in zone 9, 290°C in zone 10, machine head 285°C; screw speed 250rpm, aspect ratio L/D=40/1.

Example 3

(1) Crushing the waste CFRP material and sieving to obtain 80-mesh waste CFRP powder.

(2) Weigh 30 parts of waste CFRP powder and dry it in a high mixer at 120°C for 10 minutes, then add 3 parts of titanate coupling agent isopropyl tris(dodecylbenzenesulfonyl) titanate to surface treat waste CFRP powder.

(3) Weigh 70 parts of PA6, 0.6 parts of polyethylene wax, 0.3 parts of anti-1098, 0.2 parts of anti-168 and mix them evenly in a high mixer.

(4) Add the homogeneously mixed raw materials into the twin-screw extruder, melt and blend, extrude, and pelletize the strands to obtain the required waste CFRP powder reinforced nylon composition. The temperature in each zone of the twin-screw extruder is; 220°C, 230°C in zone 2, 240°C in zone 3, 250°C in zone 4, 260°C in zone 5, 270°C in zone 6, 280°C in zone 7, 280°C in zone 8, 290°C in zone 9, 290°C in zone 10, machine head 285°C; screw speed 400rpm, aspect ratio L/D=50/1.

Example 4

(1) Crushing the waste CFRP material and sieving to obtain 300 mesh waste CFRP powder.

(2) Weigh 40 parts of waste CFRP powder and dry it in a high mixer at 120°C for 10 min, then add 3 parts of aluminate coupling agent distearoyloxyisopropyl aluminate to surface treat the waste CFRP powder.

(3) Weigh 60 parts of PA11, 0.5 parts of white oil, 0.3 parts of anti-1076, 0.2 parts of anti-168 and mix them evenly in a high mixer.

(4) Add the uniformly mixed raw materials into the twin-screw extruder, melt and blend, extrude, and pelletize the strands to obtain the required waste CFRP powder reinforced nylon composition. The temperature in each zone of the twin-screw extruder is: Zone 1 220°C, 230°C in zone 2, 240°C in zone 3, 250°C in zone 4, 260°C in zone 5, 270°C in zone 6, 280°C in zone 7, 280°C in zone 8, 290°C in zone 9, 290°C in zone 10, machine head 285°C; screw speed 400rpm, aspect ratio L/D=50/1.

Example 5

(1) Crushing waste CFRP materials and sieving to obtain 200-mesh waste CFRP powder.

(2) Weigh 5 parts of waste CFRP powder and dry it in a high mixer at 100°C for 20 minutes, then add 0.2 parts of titanate coupling agent isopropyl tris(dodecylbenzenesulfonyl) titanate to surface treat waste CFRP powder.

(3) Weigh 95 parts of PA1010, 0.3 part of stearic acid, 0.3 part of anti-1010, 0.1 part of anti-168 and mix them evenly in a high mixer.

(4) Add the uniformly mixed raw materials into the twin-screw extruder, melt and blend, extrude, and pelletize the strands to obtain the required waste CFRP powder reinforced nylon composition. The temperature in each zone of the twin-screw extruder is: Zone 1 220°C, 230°C in zone 2, 240°C in zone 3, 250°C in zone 4, 260°C in zone 5, 270°C in zone 6, 280°C in zone 7, 280°C in zone 8, 290°C in zone 9, 290°C in zone 10, machine head 285°C; screw speed 150rpm, aspect ratio L/D=30/1.

The mechanical property test results of each embodiment are shown in Table 1 below:

Table 1 Mechanical property test results

From the analysis of the mechanical performance test results in the above table, it can be seen that the nylon composition reinforced with recycled CFRP powder has high strength and excellent mechanical properties, which is suitable for use in occasions with high performance requirements.

The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to the embodiment, and apply the general principles described in this description to other embodiments without creative effort. Therefore, the present invention is not limited to the embodiments herein. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (9)

1. a discarded carbon-fibre composite powder Reinforced Nylon composition, is characterized in that, the component that said composition comprises following weight part is made:

2. discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 1, it is characterized in that, described nylon is one or more in nylon 6 (PA6), nylon 66 (PA66), nylon 11 (PA11), nylon 12 (PA12), nylon 1010 (PA1010), NYLON610 T (PA610T).

3. discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 1, is characterized in that, described discarded CFRP powder is by discarded CFRP material fragmentation gained, and preferably the particle diameter after fragmentation is between 40-400 order.

4. discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 1, is characterized in that, described surface treatment agent is silane coupling agent, one or more in titanate coupling agent and aluminate coupling agent.

5. discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 1, it is characterized in that, described lubricant is one or more in stearic acid, Zinic stearas, calcium stearate, Ployethylene Wax, white oil, ethylene bis stearamide (EBS), erucicamide.

6. discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 1, is characterized in that, described oxidation inhibitor is one or more in antioxidant 1010, antioxidant 1076, oxidation inhibitor 1098, irgasfos 168.

7. a preparation method for discarded carbon-fibre composite powder Reinforced Nylon composition as claimed in claim 1, is characterized in that, comprises the following steps:

(1) by discarded CFRP material fragmentation, sieve, obtain particle diameter discarded CFRP powder uniformly;

(2) by said ratio, take discarded CFRP powder drying treatment in high mixer of 5-40 part, then add the surface treatment agent of 0.1-3 part to process CFRP powder surface;

(3) by proportioning, take 60-95 part nylon again, 0.1-0.6 part lubricant, 0.1-0.5 part oxidation inhibitor, in high mixer, mixes;

(4) raw material step (3) being mixed joins melt blending in dual-screw-stem machine, extrudes, and water-cooled, tie rod pelletizing must be discarded the nylon composite that CFRP strengthens.

8. the preparation method of discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 7, is characterized in that, in described step (2), the drying temperature of high mixer is 80-120 ℃, and be 10-30min time of drying.

9. the preparation method of discarded carbon-fibre composite powder Reinforced Nylon composition according to claim 7, it is characterized in that, the twin screw extruder of described step (4) is in the same way or counter rotation twin screw extruder, extruder temperature is 190-290 ℃, screw speed is 150-400rpm, and screw slenderness ratio L/D is 30-50:1.