Low-temperature-resistant impact-resistant polypropylene dispensing cylinder

Abstract

The invention relates to a low-temperature-resistant impact-resistant polypropylene dispensing barrel, and belongs to the technical field of dispensing barrels. The preparation method comprises the following steps: creatively taking 1, 2, 3, 6-tetrahydrophthalic anhydride and ethylenediamine as initial raw materials, carrying out ring-opening bonding based on the action of anhydride and amino to realize amidation so as to obtain a nucleating agent containing two carbon-carbon double bonds, then on the basis of click addition of sulfydryl-ene, firstly modifying the nucleating agent by using a certain amount of alkane mercaptan, and then modifying the nucleating agent by using a certain amount of alkane mercaptan so as to obtain a modified nucleating agent containing two carbon-carbon double bonds; the low-temperature-resistant impact-resistant polypropylene dispensing cylinder is prepared by the following steps: modifying nano calcium carbonate with sulfydryl to obtain a modified nucleating agent, chemically bonding the modified nucleating agent to the surface of the sulfydryl-modified nano calcium carbonate to prepare modified particles, and sequentially mixing the modified particles with polypropylene and a conventional auxiliary agent, banburying and performing injection molding operation, so that the low-temperature-resistant impact-resistant polypropylene dispensing cylinder is very excellent in impact resistance; and the low-temperature-resistant effect is good, and the impact resistance is also reduced slightly even in a low-temperature environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of dispensing cylinders, and particularly relates to a low-temperature resistant and impact-resistant polypropylene dispensing cylinder. Background Art

[0002] The dispensing cylinder, also known as a dispensing syringe, is a container for storing glue in a pneumatic dispensing device, and it is widely used in fields such as electronic packaging and semiconductor manufacturing. Among them, polypropylene, due to its good chemical stability, heat resistance, weather resistance and other advantages, is mainly used as the raw material for preparing the dispensing cylinder. However, the existing polypropylene dispensing cylinders still have certain drawbacks that limit their actual application effects. This is because polypropylene itself has low impact resistance, especially significant brittleness in low-temperature environments, resulting in difficulty in adapting to use in harsh environments and narrowing the scope of use. Although many existing technologies will take measures such as adding nano-particles for strengthening and toughening, such as adding nano-calcium carbonate, the nano-particles themselves have small sizes and are extremely prone to agglomeration between particles, and thus cannot well play their due roles. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a low-temperature resistant and impact-resistant polypropylene dispensing cylinder. The present invention creatively uses 1,2,3,6-tetrahydrophthalic anhydride and ethylenediamine as starting materials, and based on the action of the acid anhydride and amino group, ring-opening bonding occurs to achieve amidation, obtaining a nucleating agent containing two carbon-carbon double bonds. Then, based on the thiol-ene click addition, a certain amount of alkane thiol is first used to modify the nucleating agent to obtain a modified nucleating agent, and then the modified nucleating agent is chemically bonded to the surface of thiol-modified nano-calcium carbonate, thereby preparing modified particles. After mixing, kneading, and injection molding operations with polypropylene and conventional additives in sequence, a low-temperature resistant and impact-resistant polypropylene dispensing cylinder can be prepared, which not only has excellent impact resistance but also good low-temperature resistance, and its impact resistance also decreases less even in low-temperature environments.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A low-temperature resistant and impact-resistant polypropylene dispensing cylinder is prepared from 100 parts by weight of polypropylene, 0.5 - 1 part by weight of antioxidant, 0.5 part by weight of lubricant, and 18 - 20 parts by weight of modified particles.

[0006] As a preferred technical solution of the present invention, the antioxidant is at least one of antioxidant 1010 and antioxidant 168.

[0007] As a preferred technical solution of the present invention, the lubricant is calcium stearate.

[0008] As a preferred technical solution of the present invention, the modified particles are prepared by the following steps:

[0009] (1) Add 3-4 parts by weight of 1,2,3,6-tetrahydrophthalic anhydride to 30-40 parts by weight of tetrahydrofuran, and then stir at room temperature until completely dissolved to obtain solution A; add ethylenediamine to 30-40 parts by weight of tetrahydrofuran, and then stir at room temperature for 5-10 min to mix to obtain solution B; dropwise add solution B to solution A while stirring at room temperature, and continue to stir at a constant temperature for 20-26 h after all the dropping is completed, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry it at 60-80 °C until constant weight to obtain a nucleating agent;

[0010] (2) Add 6-7 parts by weight of the nucleating agent, 1 part by weight of alkane thiol and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir at 85-95 °C for 6-8 h to mix, naturally cool to room temperature, add 300-350 parts by weight of tetrahydrofuran, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry it at 60-80 °C until constant weight to obtain a modified nucleating agent;

[0011] (3) Add 3 parts by weight of the modified nucleating agent, 0.8-1 part by weight of thiol-modified nano calcium carbonate and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir at 85-95 °C for 6-8 h to mix, filter, take the filter residue, wash it with ethanol, and finally vacuum dry it at 60-80 °C until constant weight, thus the preparation is completed.

[0012] Further, the molar ratio of the 1,2,3,6-tetrahydrophthalic anhydride to the ethylenediamine in step (1) is 2.1-2.2:1.

[0013] Further, the dropping rate in step (1) is controlled at 1-2 s / drop.

[0014] Further, the alkane thiol in step (2) is hexadecyl mercaptan or octadecyl mercaptan.

[0015] Further, the thiol-modified nano calcium carbonate in step (3) is prepared by the following steps:

[0016] Mix 70-80 parts by weight of ethanol, 10-20 parts by weight of deionized water, 1 part by weight of nano calcium carbonate and 0.5-1 part by weight of γ-mercaptopropyltrimethoxysilane in an ultrasonic bath at 70-75 °C for 12-14 h, filter, take the filter residue, wash it with ethanol, and finally vacuum dry it at 60-80 °C until constant weight, thus the preparation is completed.

[0017] Preferably, the power of the ultrasound is 300 - 500W.

[0018] A preparation method of a low-temperature resistant and impact-resistant polypropylene dispensing cylinder, the preparation method comprising the following steps:

[0019] Mix polypropylene, antioxidant, lubricant and modified particles, and then carry out internal mixing using a torque rheometer, followed by injection molding to complete the preparation.

[0020] Furthermore, the working parameters of the torque rheometer are that the temperature of the first zone is controlled at 200 - 210°C, the temperature of the second zone is controlled at 200 - 210°C, the temperature of the third zone is controlled at 200 - 210°C, and the time is controlled at 5 - 10 min.

[0021] Furthermore, the pressure of the injection molding is 100 MPa; the speed of the injection molding is 80 mm / s.

[0022] The beneficial effects of the present invention:

[0023] (1) The present invention creatively uses 1,2,3,6-tetrahydrophthalic anhydride and ethylenediamine as starting materials. Based on the ring-opening bonding of the acid anhydride and amino group, amidation is achieved to obtain a nucleating agent containing two carbon-carbon double bonds. Then, based on the thiol-ene click addition, a certain amount of alkane thiol is first used to modify the nucleating agent to obtain a modified nucleating agent, and then the modified nucleating agent is chemically bonded to the surface of thiol-modified nano calcium carbonate, thereby preparing modified particles. After sequentially performing mixing, internal mixing, and injection molding operations with polypropylene and conventional additives, a low-temperature resistant and impact-resistant polypropylene dispensing cylinder can be prepared. It not only has excellent impact resistance but also has good low-temperature resistance, and its impact resistance decreases less even in a low-temperature environment.

[0024] (2) The present invention creatively uses 1,2,3,6-tetrahydrophthalic anhydride and ethylenediamine as starting materials. Based on the reaction of the acid anhydride and amino group to undergo ring-opening bonding and achieve amidation, a nucleating agent containing two carbon-carbon double bonds is obtained. On the one hand, the presence of the two carbon-carbon double bonds provides feasibility for subsequent further treatment. On the other hand, the nucleating agent has the effect of inducing the formation of β-crystals in polypropylene, which can effectively improve the toughness of polypropylene, enhance the impact resistance performance, and promote the low-temperature resistance effect. Then, based on the thiol-ene click addition, a certain amount of alkane thiol is first used to modify the nucleating agent to obtain a modified nucleating agent. Compared with the unmodified one, the modified nucleating agent has the molecular structure of alkane, which can enhance its non-polarity. According to the "like dissolves like" principle, it can better match the non-polar polypropylene, greatly improving the interfacial adhesion effect between the two and exerting the excellent induction effect of β-crystals. Then, the modified nucleating agent is chemically bonded to the surface of thiol-modified nano-calcium carbonate to obtain modified particles. By introducing nano-calcium carbonate, nano-calcium carbonate can have a good synergistic effect with the modified nucleating agent, jointly endowing the finally prepared dispensing cylinder with more excellent impact resistance performance and low-temperature resistance ability. Different from the prior art which simply uses a nucleating agent and nano-calcium carbonate in a compound manner, the modified particles of the present invention form a structure similar to the "coating" of nano-calcium carbonate by the nucleating agent. It not only effectively solves the agglomeration problem of nano-calcium carbonate and has good dispersibility, but also the compounding between each other enables the modified particles to better transfer and consume energy when acting as stress concentration points, terminate crack propagation, and resist greater external forces. Detailed Embodiments

[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with embodiments, details the specific embodiments, structures, features and their effects according to the present invention as follows.

[0026] The polypropylene in all examples and comparative examples of the present invention is purchased from Yangzi Petrochemical, with the brand number F401; the nano-calcium carbonate is purchased from Zhejiang Manli Nano Technology Co., Ltd., with the model ML-CaCo3-N50 and a particle size of 50 nm.

[0027] Example 1

[0028] A low-temperature resistant and impact-resistant polypropylene dispensing cylinder is prepared from 100 parts by weight of polypropylene, 0.5 part by weight of antioxidant, 0.5 part by weight of lubricant and 18 parts by weight of modified particles.

[0029] The antioxidant is antioxidant 1010.

[0030] The lubricant is calcium stearate.

[0031] The modified particles are prepared through the following steps:

[0032] (1) Add 3 parts by weight of 1,2,3,6 - tetrahydrophthalic anhydride to 30 parts by weight of tetrahydrofuran, and then stir at room temperature until completely dissolved to obtain solution A; add ethylenediamine to 30 parts by weight of tetrahydrofuran, and then stir at room temperature for 5 min to mix, obtaining solution B; dropwise add solution B to solution A with stirring at room temperature, and continue to stir at a constant temperature for 20 h after all the addition is completed. Filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry at 60 °C until constant weight to obtain a nucleating agent;

[0033] (2) Add 6 parts by weight of the nucleating agent, 1 part by weight of alkane thiol, and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N - dimethylformamide, then stir at 85 °C for 6 h to mix, naturally cool to room temperature, add 300 parts by weight of tetrahydrofuran, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry at 60 °C until constant weight to obtain a modified nucleating agent;

[0034] (3) Add 3 parts by weight of the modified nucleating agent, 0.8 part by weight of mercapto - modified nano - calcium carbonate, and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N - dimethylformamide, then stir at 85 °C for 6 h to mix, filter, take the filter residue, wash it with ethanol, and finally vacuum dry at 60 °C until constant weight, thus completing the preparation.

[0035] The molar ratio of the 1,2,3,6 - tetrahydrophthalic anhydride to the ethylenediamine in step (1) is 2.1:1.

[0036] The dropping rate in step (1) is controlled at 1 s / drop.

[0037] The alkane thiol in step (2) is octadecanethiol.

[0038] The mercapto - modified nano - calcium carbonate in step (3) is prepared through the following steps:

[0039] Mix 70 parts by weight of ethanol, 10 parts by weight of deionized water, 1 part by weight of nano - calcium carbonate, and 0.5 part by weight of γ - mercaptopropyltrimethoxysilane with stirring in ultrasonic waves at 70 °C for 12 h, filter, take the filter residue, wash it with ethanol, and finally vacuum dry at 60 °C until constant weight, thus completing the preparation.

[0040] The power of the ultrasonic waves is 300 W.

[0041] A preparation method of a low - temperature resistant and impact - resistant polypropylene dispensing cylinder, the preparation method comprising the following steps:

[0042] Mix polypropylene, antioxidant, lubricant and modified particles, and then conduct internal mixing using a torque rheometer and injection molding to complete the preparation.

[0043] The working parameters of the torque rheometer are that the temperature of the first zone is controlled at 200 °C, the temperature of the second zone is controlled at 200 °C, the temperature of the third zone is controlled at 200 °C, and the time is controlled at 5 min.

[0044] The pressure of the injection molding is 100 MPa; the speed of the injection molding is 80 mm / s.

[0045] Example 2

[0046] A low-temperature resistant and impact-resistant polypropylene dispensing cylinder is prepared from 100 parts by weight of polypropylene, 1 part by weight of antioxidant, 0.5 part by weight of lubricant and 20 parts by weight of modified particles.

[0047] The antioxidant is antioxidant 1010.

[0048] The lubricant is calcium stearate.

[0049] The modified particles are prepared through the following steps:

[0050] (1) Add 4 parts by weight of 1,2,3,6-tetrahydrophthalic anhydride to 40 parts by weight of tetrahydrofuran, and then stir at room temperature until completely dissolved to obtain solution A; add ethylenediamine to 40 parts by weight of tetrahydrofuran, and then stir for 10 min at room temperature to mix, obtaining solution B; dropwise add solution B to solution A while stirring at room temperature, continue to stir at a constant temperature for 26 h after all the dropping is completed, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry at 80 °C until constant weight to obtain a nucleating agent;

[0051] (2) Add 7 parts by weight of the nucleating agent, 1 part by weight of alkane thiol and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir at 95 °C for 8 h to mix, naturally cool to room temperature, add 350 parts by weight of tetrahydrofuran, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry at 80 °C until constant weight to obtain a modified nucleating agent;

[0052] (3) Add 3 parts by weight of the modified nucleating agent, 1 part by weight of thiol-modified nano calcium carbonate and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir at 95 °C for 8 h to mix, filter, take the filter residue, wash it with ethanol, and finally vacuum dry at 80 °C until constant weight to complete the preparation.

[0053] The molar ratio of the 1,2,3,6 - tetrahydrophthalic anhydride described in step (1) to the ethylenediamine is 2.2:1.

[0054] The dropping rate described in step (1) is controlled at 2 s / drop.

[0055] The alkanethiol described in step (2) is octadecanethiol.

[0056] The mercapto - modified nano - calcium carbonate described in step (3) is prepared by the following steps:

[0057] 80 parts by weight of ethanol, 20 parts by weight of deionized water, 1 part by weight of nano - calcium carbonate, and 1 part by weight of γ - mercaptopropyltrimethoxysilane are mixed by stirring under ultrasonic wave at 75 °C for 14 h, filtered, the filter residue is taken, washed with ethanol, and finally dried in vacuum at 80 °C until constant weight, then the preparation is completed.

[0058] The power of the ultrasonic wave is 500 W.

[0059] A preparation method of a low - temperature resistant and impact - resistant polypropylene dispensing cylinder, the preparation method includes the following steps:

[0060] Polypropylene, antioxidant, lubricant, and modified particles are mixed, and then kneaded by a torque rheometer and injection - molded, then the preparation is completed.

[0061] The working parameters of the torque rheometer are that the temperature of the first zone is controlled at 210 °C, the temperature of the second zone is controlled at 210 °C, the temperature of the third zone is controlled at 210 °C, and the time is controlled at 10 min.

[0062] The pressure of the injection molding is 100 MPa; the speed of the injection molding is 80 mm / s.

[0063] Example 3

[0064] A low - temperature resistant and impact - resistant polypropylene dispensing cylinder, the low - temperature resistant and impact - resistant polypropylene dispensing cylinder is prepared from 100 parts by weight of polypropylene, 0.8 parts by weight of antioxidant, 0.5 parts by weight of lubricant, and 19 parts by weight of modified particles.

[0065] The antioxidant is antioxidant 1010.

[0066] The lubricant is calcium stearate.

[0067] The modified particles are prepared by the following steps:

[0068] (1) Add 3.5 parts by weight of 1,2,3,6-tetrahydrophthalic anhydride to 35 parts by weight of tetrahydrofuran, and then stir at room temperature until completely dissolved to obtain Solution A; add ethylenediamine to 35 parts by weight of tetrahydrofuran, and then stir and mix at room temperature for 8 min to obtain Solution B; dropwise add Solution B to Solution A while stirring at room temperature, and continue to stir and mix at a constant temperature for 24 h after all the dropping is completed. Filter, take the filter residue, wash it with tetrahydrofuran, and finally dry it under vacuum at 70 °C until a constant weight is obtained to obtain a nucleating agent;

[0069] (2) Add 6.5 parts by weight of the nucleating agent, 1 part by weight of alkane thiol, and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir and mix at 90 °C for 7 h. Naturally cool to room temperature, add 330 parts by weight of tetrahydrofuran, filter, take the filter residue, wash it with tetrahydrofuran, and finally dry it under vacuum at 70 °C until a constant weight is obtained to obtain a modified nucleating agent;

[0070] (3) Add 3 parts by weight of the modified nucleating agent, 0.9 part by weight of thiol-modified nano calcium carbonate, and 0.5 part by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir and mix at 90 °C for 7 h. Filter, take the filter residue, wash it with ethanol, and finally dry it under vacuum at 70 °C until a constant weight is obtained, thus completing the preparation.

[0071] The molar ratio of the 1,2,3,6-tetrahydrophthalic anhydride to the ethylenediamine in step (1) is 2.15:1.

[0072] The dropping rate in step (1) is controlled at 1.5 s / drop.

[0073] The alkane thiol in step (2) is octadecanethiol.

[0074] The thiol-modified nano calcium carbonate in step (3) is prepared by the following steps:

[0075] Mix 75 parts by weight of ethanol, 15 parts by weight of deionized water, 1 part by weight of nano calcium carbonate, and 0.8 part by weight of γ-mercaptopropyltrimethoxysilane by stirring under ultrasonic wave at 73 °C for 13 h. Filter, take the filter residue, wash it with ethanol, and finally dry it under vacuum at 70 °C until a constant weight is obtained, thus completing the preparation.

[0076] The power of the ultrasonic wave is 400 W.

[0077] A preparation method of a low-temperature resistant and impact-resistant polypropylene dispensing cylinder, the preparation method comprising the following steps:

[0078] Mix polypropylene, an antioxidant, a lubricant, and modified particles, and then carry out internal mixing using a torque rheometer and injection molding, thus completing the preparation.

[0079] The working parameters of the torque rheometer are that the temperature of zone 1 is controlled at 205 °C, the temperature of zone 2 is controlled at 205 °C, the temperature of zone 3 is controlled at 205 °C, and the time is controlled at 8 min.

[0080] The pressure of the injection molding is 100 MPa; the speed of the injection molding is 80 mm / s.

[0081] Comparative Example 1

[0082] On the basis of Example 3, step (2) is not carried out, and the modified nucleating agent in step (3) is changed to a nucleating agent of equal weight, and the rest remain unchanged.

[0083] Comparative Example 2

[0084] On the basis of Example 3, steps (1) and (2) are not carried out, and both the modified nucleating agent and azodiisobutyronitrile in step (3) are changed to N,N-dimethylformamide of equal weight, and the rest remain unchanged.

[0085] Comparative Example 3

[0086] On the basis of Example 3, step (3) is changed to mix the modified nucleating agent and mercapto-modified nano-calcium carbonate in a mass ratio of 1:12, and the preparation is completed; the rest remain unchanged.

[0087] Comparative Example 4

[0088] On the basis of Example 3, step (3) is changed to mix the modified nucleating agent and polypropylene in a mass ratio of 1:12, and the preparation is completed; the rest remain unchanged.

[0089] Test Example 1

[0090] Impact strength test:

[0091] The formula raw materials in Example 3 and Comparative Examples 1-4, namely polypropylene, antioxidant, lubricant and modified particles, are respectively placed in a torque rheometer for mixing (temperature 200 °C, rotation speed 60 rpm, time 5 min), and then hot press molding is carried out (temperature 200 °C, pressure 10 MPa, time 3 min) to obtain various test samples; the cantilever beam notched impact strength test (Type A notch) of the test samples is carried out at 23 °C in accordance with the standard GB / T 1843-2008.

[0092] Table 1. Test results of impact strength

[0093] <![CDATA[Izod impact strength of cantilever beam / kJ·m -2 > Example 3 7.90 Comparative Example 1 5.89 Comparative Example 2 4.12 Comparative Example 3 6.64 Comparative Example 4 4.77

[0094] Test Example 2

[0095] Low temperature resistance test:

[0096] The formulation raw materials in Example 3 and Comparative Examples 1-4, namely polypropylene, antioxidant, lubricant and modified particles, were respectively placed in a torque rheometer for mixing (temperature: 200 °C, rotation speed: 60 rpm, time: 5 min), and then hot-pressed (temperature: 200 °C, pressure: 10 MPa, time: 3 min) to obtain various test samples; the cantilever beam notched impact strength test (Type A notch) of the test samples was carried out at -20 °C in accordance with Standard GB / T 1843-2008.

[0097] Table 2. Low-temperature resistance test results

[0098] <![CDATA[Izod impact strength of cantilever beam / kJ·m -2 > Example 3 6.99 Comparative Example 1 4.91 Comparative Example 2 2.75 Comparative Example 3 5.43 Comparative Example 4 3.47

[0099] It can be seen from the comparison between Example 3, Comparative Examples 1-4 and Test Examples 1-2 that the dispensing cylinder prepared by the present invention not only has excellent impact resistance, but also has good low-temperature resistance, and its impact resistance decreases less even in a low-temperature environment.

[0100] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A low temperature resistant and impact resistant polypropylene dispensing cylinder, characterized in that: The low-temperature-resistant and impact-resistant polypropylene dispensing cylinder is prepared from 100 parts by weight of polypropylene, 0.5-1 parts by weight of an antioxidant, 0.5 parts by weight of a lubricant and 18-20 parts by weight of modified particles.

2. The low-temperature resistant and impact-resistant polypropylene dispensing cartridge according to claim 1, characterized in that: The antioxidant is at least one of the antioxidant 1010 and the antioxidant 168 .

3. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 1, characterized in that: The lubricant is calcium stearate.

4. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 1, characterized in that: The modified particles are prepared by the following steps: (1) Add 3-4 parts by weight of 1,2,3,6-tetrahydrophthalic anhydride to 30-40 parts by weight of tetrahydrofuran, and then stir at room temperature until it is completely dissolved to obtain solution A; add ethylenediamine to 30-40 parts by weight of tetrahydrofuran, and then stir at room temperature for 5-10 minutes to obtain solution B; add solution B dropwise to solution A at room temperature while stirring, continue to stir at a constant temperature for 20-26 hours after all the addition is completed, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry it at 60-80°C until constant weight, to obtain a nucleating agent; (2) Add 6-7 parts by weight of a nucleating agent, 1 part by weight of alkane thiol and 0.5 parts by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir and mix at 85-95° C. for 6-8 hours, cool naturally to room temperature, add 300-350 parts by weight of tetrahydrofuran, filter, take the filter residue, wash it with tetrahydrofuran, and finally vacuum dry it at 60-80° C. until constant weight, to obtain a modified nucleating agent; (3) Add 3 parts by weight of a modified nucleating agent, 0.8-1 parts by weight of thiol-modified nano-calcium carbonate and 0.5 parts by weight of azobisisobutyronitrile to 60 parts by weight of N,N-dimethylformamide, and then stir the mixture at 85-95°C for 6-8 hours, filter, take the filter residue, wash it with ethanol, and finally vacuum dry it at 60-80°C until constant weight. The preparation is completed.

5. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 4, characterized in that: In step (1), the molar ratio of the 1,2,3,6-tetrahydrophthalic anhydride to the ethylenediamine is 2.1-2.2:

1.

6. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 4, characterized in that: The dripping rate of step (1) is controlled at 1-2 s / drop.

7. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 4, characterized in that: The alkanethiol in step (2) is hexadecanethiol or octadecanethiol.

8. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 4, characterized in that: The thiol-modified nano-calcium carbonate in step (3) is prepared by the following steps: 70-80 parts by weight of ethanol, 10-20 parts by weight of deionized water, 1 part by weight of nano-calcium carbonate and 0.5-1 part by weight of γ-mercaptopropyltrimethoxysilane are mixed under ultrasonic stirring at 70-75° C. for 12-14 hours, filtered, the filter residue is taken, washed with ethanol, and finally vacuum dried at 60-80° C. until constant weight, and the preparation is completed.

9. The low temperature resistant and impact resistant polypropylene dispensing cartridge according to claim 8, characterized in that: The power of the ultrasound is 300-500W.

10. A method for preparing the low temperature resistant and impact resistant polypropylene dispensing cylinder according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: The polypropylene, antioxidant, lubricant and modified particles are mixed, then kneaded using a torque rheometer, and injection molded to complete the preparation.