阅读说明：本技术 一种粉末尼龙制备装置、制备方法及粉末尼龙 (Powder nylon preparation device and preparation method and powder nylon ) 是由 宋春华 胡峰 邓辉雄 周恒拓 邓建林 于 2020-11-26 设计创作，主要内容包括：本发明公开了一种粉末尼龙制备装置,包括预聚釜和出料增粘一体化装置,出料增粘一体化装置的输入端与预聚釜的输出端相连,出料增粘一体化装置包括装置本体和用于对装置本体内的物料进行破碎搅拌的破碎搅拌装置。本发明还公开了一种粉末尼龙制备方法,该方法采用上述的粉末尼龙制备装置进行制备,包括加入原料、置换空气、升温保压、减压抽真空、破碎搅拌和固相增粘等步骤。本发明还公开了一种采用上述制备装置或制备方法制备得到的粉末尼龙产品。本发明可合成出分子量高、分子量分布宽度较窄、粒径均一的脂肪族粉末尼龙,普遍应用于旋转成型、粉末涂料、压制烧结、3D打印等工业领域。(The invention discloses a powder nylon preparation device which comprises a prepolymerization kettle and an integrated discharging and tackifying device, wherein the input end of the integrated discharging and tackifying device is connected with the output end of the prepolymerization kettle, and the integrated discharging and tackifying device comprises a device body and a crushing and stirring device for crushing and stirring materials in the device body. The invention also discloses a preparation method of the powder nylon, which adopts the powder nylon preparation device to prepare the powder nylon and comprises the steps of adding raw materials, replacing air, heating and maintaining pressure, decompressing and vacuumizing, crushing and stirring, solid-phase tackifying and the like. The invention also discloses a powder nylon product prepared by the preparation device or the preparation method. The method can synthesize the aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size, and is generally applied to the industrial fields of rotary forming, powder coating, pressing and sintering, 3D printing and the like.)

1. The utility model provides a powder nylon preparation facilities which characterized in that: including prepolymerization cauldron (1) and the tackified integrated device of ejection of compact (2), the input of the tackified integrated device of ejection of compact (2) with the output of prepolymerization cauldron (1) links to each other, the tackified integrated device of ejection of compact (2) include device body (21) and be used for right material in device body (21) carries out broken agitating unit (22) that stir.

2. The apparatus for preparing powdered nylon of claim 1, wherein: the discharging and tackifying integrated device (2) further comprises a heat exchange jacket (23) and a mold temperature controller (24) for controlling the temperature in the device body (21), wherein the heat exchange jacket (23) is arranged on the outer layer of the device body (21).

3. The apparatus for preparing powdered nylon of claim 1, wherein: the discharging and tackifying integrated device (2) further comprises a vacuum unit (25) used for adjusting the pressure in the device body (21), and the volume of the device body (21) is 3-5 times of that of the prepolymerization kettle (1).

4. The apparatus for preparing powdered nylon according to any one of claims 1 to 3, wherein: the integrated discharging and tackifying device (2) further comprises a pressure spraying device (26), and the pressure spraying device (26) is arranged between the prepolymerization kettle (1) and the integrated discharging and tackifying device (2).

5. A preparation method of powder nylon is characterized in that: an apparatus for preparing nylon powder according to any one of claims 1 to 4, comprising the steps of,

s1, putting the raw materials into a prepolymerization kettle (1), and adding a light stabilizer, a molecular weight regulator, sodium hypophosphite and deionized water;

s2, replacing air in the prepolymerization kettle (1) with nitrogen, then increasing the temperature in the prepolymerization kettle (1), and maintaining the pressure;

s3, discharging the gas in the prepolymerization kettle (1) to normal pressure, and then vacuumizing and further decompressing the prepolymerization kettle (1) to obtain nylon resin;

and S4, spraying the nylon resin into the discharging and tackifying integrated device (2) and crushing and stirring the nylon resin to obtain powder nylon.

6. The process for preparing powdered nylon of claim 5, wherein: the raw material in S1 is one or more of lactam and aliphatic nylon salt.

7. The process for preparing powdered nylon of claim 5, wherein: in the S2, the temperature in the prepolymerization reactor (1) is firstly increased to 180-220 ℃, the pressure in the prepolymerization reactor (1) is kept at 1.5-2.5 MPa, the temperature in the prepolymerization reactor (1) is then increased to 200-260 ℃, and the pressure in the prepolymerization reactor (1) is kept at 1.5-2.0 MPa.

8. The process for preparing powdered nylon of claim 5, wherein: and in the S3, the pressure in the prepolymerization reactor (1) is maintained for 1.5h before the gas in the prepolymerization reactor (1) is released to the normal pressure, and then the inside of the prepolymerization reactor (1) is vacuumized and further decompressed to-0.06 MPa.

9. The process for preparing powdered nylon of claim 5, wherein: in the step S4, the nylon resin is sprayed into the device body (21) through the pressure spraying device (26), the sprayed nylon resin is crushed and stirred by the crushing and stirring device (22), the temperature in the device body (21) is controlled through the heat exchange jacket (23) and the mold temperature controller (24), and the material in the device body (21) is subjected to solid-phase tackifying treatment by adjusting the pressure of the device body (21) through the vacuum unit (25).

10. A powdered nylon produced by the powdered nylon-producing apparatus according to any one of claims 1 to 4 or the powdered nylon-producing method according to any one of claims 5 to 9.

Technical Field

The invention relates to the technical field of nylon materials, in particular to a powder nylon preparation device, a preparation method and powder nylon.

Background

The powder nylon is a polymer material with great development prospect, maintains the excellent physical and chemical properties of the original nylon, has larger specific surface area, porous structure and good processing performance, so that the powder nylon can be widely applied in various fields, and the fields with more applications at present comprise powder coating, biomedicine, adhesive, modified filler, cosmetics and the like.

Patent CN104191615A discloses a preparation method of a high molecular polymer powder material for 3D printing, specifically a preparation method of a nylon coated high molecular polymer powder material, which selects a strong polar solvent to dissolve nylon, separates out crystals, and selects powder with a certain particle size distribution as the nylon coated high molecular polymer powder material through vacuum drying, ball milling and screening.

Patent CN106893314A discloses a wear-resistant polyimide resin/nylon composite material, and a preparation method and an application thereof, wherein the composite material comprises the following components in parts by weight: 80-95 parts of nylon powder, 0.5-20 parts of polyimide resin powder, 0.1-2 parts of surface modifier, 0.5-2 parts of flow aid and 0.1-1 part of antioxidant, and the finished product has uniform particle size distribution, particle size range of 40-60 mu m, regular shape and good fluidity by the preparation processes of melting, uniformly mixing, precipitation, filtering, solvent removal, screening and the like in a high-pressure reaction kettle under the protection of nitrogen, can be used as a 3D printing material and meets the performance requirement of 3D printing.

Patent CN1473877A discloses that nylon 1212 resin is obtained by polymerizing nylon 1212 salt, antioxidant and molecular weight regulator, then nylon 1212 resin, pigment and auxiliary agent are extruded by twin-screw for granulation, and the nylon 1212 powder is obtained by procedures of cryogenic crushing, shaping and sieving, and the preparation procedure of powdered nylon is complicated and the production efficiency is low.

Therefore, the existing preparation device and preparation process of the powder nylon have the problems of high organic solvent recovery cost, large pollution, more process steps, low production efficiency and the like.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a preparation device and a preparation method of powdered nylon, which can synthesize aliphatic powdered nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size and are generally applied to the industrial fields of rotary forming, powder coating, pressing and sintering, 3D printing and the like.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the utility model provides a powder nylon preparation facilities, includes the tackified integrated device of prepolymerization cauldron and ejection of compact, the tackified integrated device of ejection of compact's input with the output of prepolymerization cauldron links to each other, the tackified integrated device of ejection of compact includes the device body and is used for right this internal material of device carries out the broken agitating unit of stirring. The discharge and viscosity increasing integrated device is matched with the prepolymerization kettle to obtain the aliphatic powdered nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size.

Preferably, the integrated discharging and tackifying device further comprises a heat exchange jacket and a mold temperature controller for controlling the temperature in the device body, wherein the heat exchange jacket is arranged on the outer layer of the device body. The heat exchange jacket and the die temperature machine can regulate and control the temperature, and the pressure material spraying device, the crushing and stirring device and the die temperature machine can realize that the powdered aliphatic nylon with smaller particle size can be obtained at lower temperature, so that the resin viscosity of the powdered nylon can be better regulated and controlled, and different performance requirements can be met.

The powder nylon preparation device is preferable, the discharging and tackifying integrated device further comprises a vacuum unit for adjusting the pressure in the device body, and the volume of the device body is 3-5 times of that of the prepolymerization kettle, so that subsequent crushing into powder nylon and solid-phase tackifying treatment can be conveniently carried out. The mold temperature machine, the vacuum unit and the solid-phase tackifying device can realize tackifying of low-viscosity aliphatic nylon resin with certain molecular weight, so that the performance requirement of the low-viscosity aliphatic nylon resin as a 3D printing material on the mechanical strength of the low-viscosity aliphatic nylon resin is met.

In the above powder nylon preparation apparatus, preferably, the integrated discharging and tackifying device further comprises a pressure spraying device, and the pressure spraying device is disposed between the prepolymerization reactor and the integrated discharging and tackifying device. The pressure material spraying device and the crushing and stirring device act simultaneously to ensure that the powder particle size of the powder nylon is uniform.

As a general technical concept, the invention also provides a preparation method of the powder nylon, which adopts the preparation device of the powder nylon and comprises the following steps,

s1, putting the raw materials into a prepolymerization kettle, and adding a light stabilizer, a molecular weight regulator, sodium hypophosphite and deionized water;

s2, replacing air in the prepolymerization kettle with nitrogen, then increasing the temperature in the prepolymerization kettle, and maintaining the pressure;

s3, discharging the gas in the prepolymerization kettle to normal pressure, and then vacuumizing the prepolymerization kettle for further decompression to obtain nylon resin;

and S4, spraying the nylon resin to a discharging and thickening integrated device, and crushing and stirring to obtain powdered nylon.

The preparation method has simple process, does not use organic solvent, and can obtain powdery nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size, wherein low-viscosity aliphatic nylon resin with certain molecular weight is obtained by prepolymerization, powdery aliphatic nylon with smaller particle size is obtained by spraying, crushing and other treatments in a discharging and tackifying integrated device, and the powdery aliphatic nylon with the required particle size is obtained by sieving.

In the above method for preparing powdered nylon, the raw material in S1 is preferably one or more of lactam and aliphatic nylon salt.

In the above preparation method of powdered nylon, preferably, in S2, the temperature in the prepolymerization reactor is first raised to 180 to 220 ℃, the pressure in the prepolymerization reactor is maintained at 1.5 to 2.5MPa, the temperature in the prepolymerization reactor is then raised to 200 to 260 ℃, and the pressure in the prepolymerization reactor is maintained at 1.5 to 2.0 MPa.

In the above preparation method of powdered nylon, preferably, in the S3, the pressure in the prepolymerization reactor is maintained for 1.5h before the gas in the prepolymerization reactor is released to normal pressure, and then the pressure in the prepolymerization reactor is further reduced to-0.06 MPa by vacuum pumping.

In the above preparation method of powdered nylon, preferably, in S4, the nylon resin is sprayed to the device body through the pressure spraying device, and the sprayed nylon resin is crushed and stirred by the crushing and stirring device, the temperature in the device body is controlled by the heat exchange jacket and the mold temperature controller, the material in the device body is subjected to solid-phase tackifying treatment by the pressure of the vacuum unit adjusting device body, and the device body is continuously vacuumized at a certain temperature and a certain rotation speed to take away water molecules produced in the system, so that the reaction is carried out in the positive direction, and the molecular weight of the powdered nylon is gradually increased. The pressure material spraying device and the crushing and stirring device ensure that the powder particle size of the powder nylon is uniform, and the solid-phase tackifying device can well regulate and control the resin viscosity of the powder nylon, so that different performance requirements are met.

As a general technical concept, the invention also provides the powder nylon prepared by the powder nylon preparation device or the powder nylon preparation method.

The above powdered nylon is preferably one or more of nylon 1010, nylon 6, nylon 66, nylon 1l, nylon 12, binary copolymer nylon and ternary copolymer nylon.

Compared with the prior art, the invention has the advantages that:

1. the powder nylon preparation device integrates the prepolymerization kettle and the discharging and tackifying integrated device, the nylon resin obtained by the prepolymerization kettle is sprayed out in the discharging and tackifying integrated device, and is simultaneously crushed at high speed and subjected to solid-phase tackifying treatment under certain temperature and pressure conditions, and the aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size can be obtained after treatment, and the preparation device is generally applied to the industrial fields of rotary forming, powder coating, pressing and sintering, 3D printing and the like.

2. The preparation method of the powder nylon adopts lactam and aliphatic nylon salt as raw materials, nylon resin with certain molecular weight is synthesized through homopolymerization or copolymerization, then pressure automatic material spraying, high-speed crushing and solid-phase tackifying treatment are carried out through a discharging and tackifying integrated device, the working procedure is simple, no organic solvent is used in the whole polymerization production process, only deionized water is used as a reaction solvent, the preparation method is green and environment-friendly, the preparation method can be repeatedly used, and zero emission is realized.

3. The powder nylon prepared by the invention has the advantages of high molecular weight, narrow molecular weight distribution width and the like, and the combination of the powder nylon and the inorganic nano-particles provides an opportunity for synthesizing the composite microsphere with excellent mechanical, electrical, optical or magnetic properties.

Drawings

FIG. 1 is a schematic view of the construction of an apparatus for preparing powdered nylon according to an embodiment.

Illustration of the drawings:

1. a prepolymerization kettle; 2. a discharging and tackifying integrated device; 21. a device body; 22. a crushing and stirring device; 23. a heat exchange jacket; 24. a mold temperature controller; 25. a vacuum unit; 26. pressure spouts material device.

Detailed Description

In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.

Example 1:

putting 5kg of caprolactam into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 with high-purity nitrogen for 3-4 times, heating to 180 ℃, maintaining the pressure in the kettle at 1.5-2.5 MPa, continuously heating to 230 ℃, maintaining the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then deflating to normal pressure, gradually vacuumizing, and reducing the pressure of the system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and carrying out pressure spraying treatment by a pressure spraying device 26, a crushing and stirring device 22 and solid-phase tackifying treatment to obtain aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size, wherein the measured relative viscosity is 2.45, the molecular weight distribution width is 1.54, and the particle size is 0.1 mm.

Example 2:

putting 5kg of laurolactam into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 with high-purity nitrogen for 3-4 times, heating to 180 ℃, keeping the pressure in the kettle at 1.5-2.5 MPa, continuously heating to 200 ℃, keeping the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then discharging to normal pressure, gradually vacuumizing, reducing the pressure of a system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and carrying out pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment to obtain aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size, wherein the measured relative viscosity is 2.48, the molecular weight distribution width is 1.50, and the particle size is 0.1 mm.

Example 3:

5kg of aminoundecanoic acid is put into a prepolymerization kettle 1, 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water are added, air in the prepolymerization kettle 1 is replaced by high-purity nitrogen for 3-4 times, the temperature is raised to 180 ℃, the pressure in the kettle is kept at 1.5-2.5 MPa, the temperature is continuously raised to 210 ℃, the pressure in the kettle is kept at 1.5-2.0 MPa, the pressure is maintained for 1.5h, then the air is discharged to normal pressure, the vacuum is gradually pumped, the pressure of the system is reduced to-0.06 MPa, nylon resin with a certain molecular weight is obtained, and after pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment, aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size is obtained, the relative viscosity is measured to be 2.46, the molecular weight distribution width is 1.48, and the particle size is 0.

Example 4:

putting 5kg of nylon 66 salt into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 with high-purity nitrogen for 3-4 times, heating to 220 ℃, keeping the pressure in the kettle at 1.5-2.5 MPa, continuously heating to 260 ℃, keeping the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then discharging to normal pressure, gradually vacuumizing to reduce the pressure of a system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and carrying out pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment to obtain aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size, wherein the measured relative viscosity is 2.50, the molecular weight distribution width is 1.55, and the particle size is 0.1 mm.

Example 5:

putting 5kg of nylon 1010 salt into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 with high-purity nitrogen for 3-4 times, heating to 180 ℃, keeping the pressure in the kettle at 1.5-2.5 MPa, continuously heating to 220 ℃, keeping the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then discharging to normal pressure, gradually vacuumizing, reducing the pressure of a system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and carrying out pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment to obtain aliphatic powder nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size, wherein the measured relative viscosity is 2.48, the molecular weight distribution width is 1.58, and the particle size is 0.1 mm.

Example 6:

putting 2.5kg of caprolactam and 2.5kg of nylon 66 salt into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 for 3-4 times by using high-purity nitrogen, heating to 180 ℃, keeping the pressure in the kettle at 1.5-2.5 MPa, continuing heating to 240 ℃, keeping the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then exhausting to normal pressure, gradually vacuumizing, reducing the pressure of a system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and obtaining the aliphatic powdered nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size after pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment, wherein the measured relative viscosity is 2.48, the molecular weight distribution width is 1.51, and the particle size is 0.1 mm.

Example 7:

putting 2.5kg of caprolactam and 2.5kg of nylon 1010 salt into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 for 3-4 times by using high-purity nitrogen, heating to 180 ℃, keeping the pressure in the kettle at 1.5-2.5 MPa, continuing heating to 220 ℃, keeping the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then exhausting to normal pressure, gradually vacuumizing, reducing the pressure of a system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and obtaining the aliphatic powdered nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size after pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment, wherein the aliphatic powdered nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size is obtained by measuring the relative viscosity of 2.52, the molecular weight distribution width of 1.52 and the particle size of 0..

Example 8:

putting 2.5kg of nylon 66 and 2.5kg of nylon 1010 salt into a prepolymerization kettle 1, adding 4g of a light stabilizer Tinuvin622, 10g of a molecular weight regulator, 50g of sodium hypophosphite and 500g of deionized water, replacing air in the prepolymerization kettle 1 for 3-4 times by using high-purity nitrogen, heating to 180 ℃, keeping the pressure in the kettle at 1.5-2.5 MPa, continuing heating to 230 ℃, keeping the pressure in the kettle at 1.5-2.0 MPa, maintaining the pressure for 1.5h, then exhausting to normal pressure, gradually vacuumizing, reducing the pressure of a system to-0.06 MPa to obtain nylon resin with a certain molecular weight, and obtaining the aliphatic powdered nylon with high molecular weight, narrow molecular weight distribution width and uniform particle size after pressure spraying device 26, crushing and stirring device 22 and solid-phase tackifying treatment, wherein the measured relative viscosity of the aliphatic powdered nylon is 2.49, the molecular weight distribution width is 1.56, and the particle size is 0.1 mm.

All of the above examples were prepared using the powdered nylon-preparing apparatus of this example.

As shown in fig. 1, the powder nylon preparation device of this embodiment includes prepolymerization reactor 1 and an integrated device 2 for discharging and tackifying, the input end of the integrated device 2 for discharging and tackifying is connected with the output end of prepolymerization reactor 1, and the integrated device 2 for discharging and tackifying includes a device body 21 and a crushing and stirring device 22 for crushing and stirring the material in device body 21.

In this embodiment, the discharging and viscosity increasing integrated device 2 further includes a heat exchange jacket 23 and a mold temperature controller 24 for controlling the temperature inside the device body 21, and the heat exchange jacket 23 is disposed on the outer layer of the device body 21.

In this embodiment, the discharging and tackifying integrated device 2 further comprises a vacuum unit 25 for adjusting the pressure in the device body 21, and the volume of the device body 21 is 3-5 times of the volume of the prepolymerization reactor 1.

In this embodiment, the integrated discharging and tackifying device 2 further includes a pressure spraying device 26, and the pressure spraying device 26 is disposed between the prepolymerization reactor 1 and the integrated discharging and tackifying device 2. Specifically, the pressure injection device 26 of the present embodiment employs an automatic ball valve.

Table 1 below shows the relevant performance data for the powdered nylons prepared in examples 1 to 8.

TABLE 1 relevant Performance data for powdered Nylon of the examples

The test method and conditions of the performance data are as follows:

melting point test conditions: weighing 5-8 mg of a sample, heating the sample to 270 ℃ under the protection of nitrogen, melting for 3min, quenching with liquid nitrogen, heating the quenched sample to 350 ℃, cooling to normal temperature, heating to 350 ℃, and heating at the rate of 10 ℃/min.

Initial decomposition temperature test conditions: weighing 5-8 mg of a sample, heating the sample to 800 ℃ at a speed of 10 ℃/min under the protection of nitrogen, and losing 5 wt% of the sample at a corresponding temperature.

Tensile strength test conditions: and (3) placing the tensile sample strips in a constant temperature and humidity box for processing for 24h, and testing by using a testing machine, wherein the testing standard is GB/T1040.2-2006.

Bending strength test conditions: the bent sample strip is placed in a constant temperature and humidity box for treatment for 24h, and a testing machine is used for testing, wherein the testing standard is GB/T9341-.

Notched impact strength test conditions: the impact sample strips are placed in a constant temperature and humidity box for treatment for 24h, and a testing machine is used for testing, wherein the testing standard is GB/T1043.1-2008.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.