CN106928624B - Core-shell nylon toughening agent based on extruder process, and preparation method and application thereof - Google Patents

Abstract

The invention discloses a core-shell nylon toughening agent based on an extruder process, and a preparation method and application thereof. The preparation method comprises the steps of uniformly mixing a thermoplastic polyolefin elastomer and polyolefin, putting the mixture into an extruder, and controlling the temperature of the extruder to be 130-170 ℃, wherein the thermoplastic polyolefin elastomer accounts for 5-95 parts by mass, the polyolefin accounts for 95-5 parts by mass, and the thermoplastic polyolefin elastomer and the polyolefin do not contain double bonds. The nylon toughening agent with the core-shell structure prepared by the method can obviously improve the impact property of the nylon material and simultaneously can reduce the tensile strength, modulus and the like of the nylon material.

Description

A kind of core-shell nylon toughening agent based on extruder technology and preparation method and application

technical field

The invention relates to a preparation method of toughened nylon, in particular to a core-shell nylon toughening agent based on an extruder process, a preparation method and application thereof.

Background technique

Nylon is one of the most widely used and most types of engineering plastics. This material has good mechanical properties, heat resistance, abrasion resistance, chemical solvent resistance, self-lubrication and certain flame retardancy. It is widely used in Automotive, electronic appliances, machinery, rail transit, sports equipment and other fields. However, pure nylon material has strong water absorption and poor low temperature impact performance, which limits the application of nylon material in low temperature or high impact performance fields.

Mixing polyolefin or polyolefin elastomer with nylon can significantly improve the shortcomings of strong water absorption and poor low temperature impact performance of the material. Due to the non-polar nature of polyolefin materials, it is difficult to mix evenly with polar nylon materials. Polar compounds, such as maleic anhydride, itaconic acid and other polar monomers are used to graft polyolefin or polyolefin elastomer. The modification method uniformly disperses the polyolefin into the nylon material and becomes the most commonly used method for preparing toughened nylon. The uniformly dispersed polyolefin or polyolefin elastomer can effectively absorb the impact energy received by the matrix material, and the dispersed polyolefin particles can also effectively prevent the generation of cracks, thus significantly improving the impact strength of the nylon material at low temperature, and the non-polar polymer The addition of olefins can also significantly reduce the water absorption of the material.

Existing processes for preparing toughened nylon all use an extruder process, which has the advantages of high quality, high output, and high efficiency.

Chinese patent (publication number CN1445278A) discloses a preparation method of maleic anhydride grafted polyolefin elastomer to toughen nylon. The nylon and maleic anhydride grafted polyolefin elastomer are extruded in an extruder at 220-240°C. Toughened nylon material is obtained.

Chinese Patent (Publication No. CN101781455A) discloses a method for preparing a super-tough nylon alloy. Nylon, itaconic acid-grafted ethylene-α-octene copolymer, antioxidant and lubricant are put into a high-speed mixer to mix, Then put the mixture into a twin-screw extruder, the extrusion temperature is 250-280°C, and the main screw speed is 200-400 rpm. After pulling, cooling, and pelletizing, a polyolefin-toughened nylon mixture is obtained.

Chinese patent (publication number CN1480489A) discloses a preparation method of toughened polyamide. First, under the action of a peroxide initiator, a polar monomer is used to graft a polyolefin elastomer in an extruder, and then the polyolefin elastomer is grafted with a polar monomer. The graft is mixed with nylon 6 uniformly, and pelletized and extruded in an extruder to obtain a composition with good toughness and processability.

Chinese Patent (Publication No. CN901067784A) discloses a preparation method of toughened nylon. First, under the action of dicumyl peroxide initiator, maleic anhydride is used to graft EPDM rubber in an extruder. , obtain the graft-modified polyolefin, then mix the graft with nylon 66 uniformly, carry out granulation extrusion in the extruder, the obtained material has good insulation, heat and cold resistance, and is used as a rail It can be used in the range of -40℃～70℃ when insulating joints.

It can be seen from the above patent that the existing technology for preparing toughened nylon using an extruder is simply to granulate the polyolefin graft and nylon through an extruder. Although the impact performance of the nylon material can also be improved, the material The strength and modulus of the nylon material are significantly reduced, and it is difficult to avoid the imbalance between the toughness and strength properties of nylon materials.

SUMMARY OF THE INVENTION

In order to overcome the defects of the process of preparing toughened nylon by an extruder, one of the objects of the present invention is to provide a preparation method of a core-shell nylon toughening agent based on an extruder process. The nylon toughening agent with the core-shell structure can significantly improve the impact performance of the nylon material, and at the same time can reduce the decline range of the tensile strength and modulus of the nylon material.

In order to achieve the above object, the technical scheme of the preparation method of the core-shell nylon toughening agent based on the extruder process of the present invention is:

A preparation method of a core-shell nylon toughening agent based on an extruder process. The thermoplastic polyolefin elastomer and the polyolefin are mixed uniformly and then put into the extruder, and the temperature of the extruder is controlled to be 130-170° C., wherein, In parts by mass, the thermoplastic polyolefin elastomer is 5-95 parts, the polyolefin is 95-5 parts, and neither the thermoplastic polyolefin elastomer nor the polyolefin contains double bonds.

In the present invention, firstly, the thermoplastic polyolefin elastomer and polyolefin are used as raw materials, and the temperature of the extruder is controlled to be 130-170° C. By adjusting the melt fluidity of the thermoplastic elastomer and the polyolefin, the thermoplastic polyolefin elastomer is The melt fluidity is good, and the melt fluidity of polyolefin is low, so that when the raw materials are blended in the extruder, the thermoplastic polyolefin elastomer can well coat the polyolefin, so that the thermoplastic polyolefin elastomer can be formed as a shell. , a core-shell structure with polyolefin as the core. Secondly, the present invention has been proved by experiments that the shell-core structure nylon toughening agent prepared by using the raw materials under this ratio can significantly improve the impact performance of the nylon material, and at the same time reduce the decline range of indexes such as tensile strength and modulus, and can achieve A balance of toughness and strength in toughened nylon materials. Third, the raw materials used in the present invention do not contain double bonds. This is because the toughening agent prepared by using the raw materials containing double bonds has poor weather resistance, especially UV resistance. After ultraviolet irradiation, the nylon prepared by the toughening agent is The strength of the material decreases and the color turns yellow, which affects the overall performance of the nylon material; to eliminate the influence of the double bond, it is necessary to add an initiator to polymerize the double bond. However, the polymerization of the double bond will crosslink the polyolefin, thereby reducing the The processability of nylon toughener increases the production cost; adding initiator will increase the process steps and increase the production process time; the addition amount of the initiator will also affect the degree of crosslinking, thus making the production process complex and changeable. At the same time, the raw material contains double bonds, the shell is connected to the core through chemical bonds, and the chemical bonds have a certain rigidity, which makes the core-shell structure more similar to the brush structure, which reduces the encapsulation of the shell, thereby reducing the toughening effect. The raw material without double bonds not only improves the weather resistance, but also does not need to add an initiator, reduces the process, and can make the shell completely coat the core, thereby improving the toughening effect of the toughening agent.

The second purpose of the present invention is to provide a kind of above-mentioned method to prepare nylon toughening agent. The nylon toughening agent takes high-toughness polyolefin elastomer as the shell layer and high-modulus polyolefin as the core, and can fully realize the balance between the toughness and strength properties of nylon materials.

In order to improve the impact performance of the nylon material and reduce the decreasing range of the strength and modulus indexes, the third purpose of the present invention is to provide the application of the above nylon toughening agent in the nylon material or the preparation of the nylon material.

The fourth purpose of the present invention is to provide a preparation method of nylon material, which can realize the balance of toughness and strength properties of nylon material.

In order to achieve the above object, the technical scheme of the preparation method of nylon material of the present invention is:

A method for preparing a nylon material, the nylon toughening agent, nylon and antioxidant are put into an extruder for extrusion.

The fifth object of the present invention is to provide a nylon material prepared by the above-mentioned preparation method of the nylon material.

The beneficial effects of the present invention are:

1. By optimizing the structure of the toughening agent, the present invention prepares a core-shell polyolefin toughening agent with a polyolefin elastomer as the shell layer and a polyolefin with a relatively high modulus as the core by using a melt extrusion process. The elastic polyolefin elastomer is coated on the surface of the high modulus polyolefin particle.

2. Compared with the method of preparing toughened nylon by the traditional extruder process, under the same composition, the impact performance of the nylon material prepared by the present invention is significantly improved, and the decrease rate of indexes such as tensile strength and modulus is reduced, which is well realized. The balance of toughness and strength of nylon material.

3. The present invention utilizes an extruder to prepare toughening agent and toughened nylon, and the preparation process has the characteristics of simple operation and easy industrialization.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The "polyolefin" in the present invention refers to the general term for polymers of ethylene, propylene or higher olefins, such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl Alpha-olefins such as base-1-pentene and certain cyclic olefins are obtained by polymerization or copolymerization alone.

The "thermoplastic polyolefin elastomer graft" mentioned in the present invention refers to a polymer of maleic anhydride (MAH) grafted polyolefin.

The "grafting" mentioned in the present invention refers to the reaction of combining appropriate branched or functional side groups on the main chain of the polymer through chemical bonds, and the product formed by the grafting or grafting reaction is called a graft copolymer.

The "nylon" described in the present invention is also translated as nylon. The English name Polyamide (referred to as PA) is a general term for thermoplastic resins containing repeating amide groups -[NHCO]- on the main chain of the molecule. Including aliphatic PA, aliphatic-aromatic PA and aromatic PA. Among them, aliphatic PA has many varieties, large output and wide application, and its name is determined by the specific number of carbon atoms of the synthetic monomer. The varieties of nylon include nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 1010, nylon 46, nylon 7, nylon 9, nylon 13, nylon 6I, nylon 9T and, nylon MXD6, etc.

The "antioxidant" mentioned in the present invention is a class of chemical substances, when only a small amount exists in the polymer system, it can delay or inhibit the progress of the oxidation process of the polymer, thereby preventing the aging of the polymer and prolonging its Service life, also known as "anti-aging agent". For example, [tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester (antioxidant 1010), 3-(3,5-di-tert-butyl-4-hydroxy)propene octadecyl Esters (Antioxidant 1076), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine (Antioxidant 1098), 2,6 -Di-tert-butyl-4-cresol (antioxidant 264), 2,4,6-tri-tert-butylphenol (antioxidant 246), (2,4-di-tert-butylphenyl)trisphosphite Esters (Antioxidant 168), etc.

As described in the background art, the existing extruder process can only simply pelletize the polyolefin graft and nylon through the extruder. The present invention provides a core-shell nylon granulator based on the extruder process Preparation method of toughener.

In a typical embodiment of the present invention, a method for preparing a core-shell nylon toughening agent based on an extruder process is provided. The temperature out of the machine is 130-170° C., wherein, in parts by mass, the thermoplastic polyolefin elastomer is 5-95 parts, the polyolefin is 95-5 parts, the thermoplastic polyolefin elastomer and the polyolefin are None of the olefins contain double bonds.

In the present invention, firstly, the thermoplastic polyolefin elastomer and polyolefin are used as raw materials, and the temperature of the extruder is controlled to be 130-170° C. By adjusting the melt fluidity of the thermoplastic elastomer and the polyolefin, the thermoplastic polyolefin elastomer is The melt fluidity is good, and the melt fluidity of polyolefin is low, so that when the raw materials are blended in the extruder, the thermoplastic polyolefin elastomer can well coat the polyolefin, so that the thermoplastic polyolefin elastomer can be formed as a shell. , a core-shell structure with polyolefin as the core. Secondly, the present invention has been proved by experiments that the shell-core structure nylon toughening agent prepared by using the raw materials under this ratio can significantly improve the impact performance of the nylon material, and at the same time reduce the decline range of indexes such as tensile strength and modulus, and can achieve A balance of toughness and strength in toughened nylon materials. Third, the raw materials used in the present invention do not contain double bonds. This is because the toughening agent prepared by using the raw materials containing double bonds has poor weather resistance, especially UV resistance. After ultraviolet irradiation, the nylon prepared by the toughening agent is The strength of the material decreases and the color turns yellow, which affects the overall performance of the nylon material; to eliminate the influence of the double bond, it is necessary to add an initiator to polymerize the double bond. However, the polymerization of the double bond will crosslink the polyolefin, thereby reducing the The processability of nylon toughener increases the production cost; adding initiator will increase the process steps and increase the production process time; the addition amount of the initiator will also affect the degree of crosslinking, thus making the production process complex and changeable. At the same time, the raw material contains double bonds, the shell is connected to the core through chemical bonds, and the chemical bonds have a certain rigidity, which makes the core-shell structure more similar to the brush structure, which reduces the encapsulation of the shell, thereby reducing the toughening effect. The raw material without double bonds not only improves the weather resistance, but also does not need to add an initiator, reduces the process, and can make the shell completely coat the core, thereby improving the toughening effect of the toughening agent.

In order to increase the dispersion uniformity of the thermoplastic polyolefin elastomer and the polyolefin, and improve the effect of the thermoplastic polyolefin elastomer covering the polyolefin, in this embodiment, preferably, a high-speed mixer is used for mixing. The high-speed mixer is powered on, setting the mixing time, pressing the switch, and turning the material back and forth through mechanical transmission to obtain a uniformly mixed product. It is suitable for mixing powder or granular materials in the chemical industry and other industries. The device has reasonable and simple structure, airtight operation, convenient feeding and discharging, and easy cleaning. The high-speed mixer is a vertical mixer, which has the advantages of simple structure, compactness, small footprint and low power consumption. The heat source of the high-speed mixer is obtained by steam, electric heating and self-friction heat generation of the mixed material, so that the material mixing keeps good uniformity and high dispersibility.

In order to ensure the uniformity of dispersion, reduce production energy consumption and save production time, in this embodiment, it is further preferred that the mixing time using a high-speed mixer is 30-35 minutes.

In order to better prepare a nylon toughening agent with a complete shell-core structure, in this embodiment, preferably, the main screw speed of the extruder is 10-250 rpm, and the feeding screw speed is 10-60 rpm.

Since the extruded material cannot be used directly, in this embodiment, preferably, the material extruded by the extruder undergoes pulling, cooling, drying, and dicing in sequence. Nylon toughening agent particles can be prepared, which is convenient to use.

When preparing the nylon toughening agent, this embodiment preferably, the thermoplastic polyolefin elastomer is maleic anhydride grafted ethylene octene copolymer (POE-g-MAH), maleic anhydride grafted ethylene propylene copolymer ( one or both of EPR-g-MAH). Maleic anhydride as a plasticizer has better plasticizing effect, and the toughening effect of the toughening agent prepared by using maleic anhydride-grafted thermoplastic polyolefin elastomer is better.

When preparing the nylon toughening agent, preferably in this embodiment, the polyolefin is low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), One or more of ethylene propylene copolymer (EPR) and ethylene octene copolymer (POE). The cost of these polyolefins is lower, and the preparation cost of the toughening agent can be better reduced.

In order to achieve a balance between the toughness and strength properties of nylon materials, this embodiment provides a method for preparing a nylon toughening agent.

In order to improve the impact performance of the nylon material and at the same time reduce the decrease range of the strength and modulus indexes, the present embodiment also provides an application of the above nylon toughening agent in the nylon material or the preparation of the nylon material.

In order to achieve a balance between the toughness and strength properties of nylon materials, the present embodiment provides a method for preparing nylon materials. The nylon toughening agent, nylon, and antioxidant are put into an extruder for extrusion.

Preferably, in parts by mass, 94.9-40.0 parts of nylon, 5-50 parts of the above nylon toughening agent, and 0.1-10 parts of antioxidant. The use of this formula can better balance the mechanical indexes such as the impact strength and tensile strength of the toughened nylon.

In order to prepare a nylon material with excellent performance, the present invention also provides a preferred method for preparing a nylon material. The nylon, the above nylon toughening agent and antioxidant are mixed in a high-speed mixer, and then the mixed materials are put into Extruded in an extruder. Using a high-speed mixer can keep the mixing uniformity and dispersibility of the material good, and then use an extruder to increase the uniformity of plasticization and mixing, and then use a die to increase the compatibility of nylon, nylon toughener and antioxidant. , to better balance the mechanical properties of nylon materials.

In order to increase the appearance of the prepared nylon material, make the toughened nylon product, and increase the profit of the enterprise, in this embodiment, preferably, the material extruded by the extruder is sequentially drawn, cooled, dried, and pelletized.

In order to further balance the mechanical properties of the nylon material, this embodiment preferably adopts the parameters of the extruder as follows: the temperature is between 170°C and 300°C, the main screw speed is 10-250 rpm, and the feeding screw speed is 10-60 rpm. /minute.

When preparing toughened nylon, the present invention preferably, the nylon is nylon 6, nylon 66, nylon 46, nylon 610, nylon 612, nylon 9, nylon 11, nylon 12, nylon 1010, nylon 1012, nylon 1212. one or more. Make the toughened nylon applicable to a wider range.

When preparing toughened nylon, preferably in the present invention, the antioxidant is [tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester (antioxidant 1010), 3- (3,5-Di-tert-butyl-4-hydroxy)propenyl octadecyl (Antioxidant 1076), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl) ) propionyl) hexamethylenediamine (antioxidant 1098), 2,6-di-tert-butyl-4-cresol (antioxidant 264), 2,4,6-tri-tert-butylphenol (antioxidant 246 ), one or more of (2,4-di-tert-butylphenyl) phosphite triester (antioxidant 168). These antioxidants 1. Low discoloration and pollution, will not affect the appearance of the finished toughened nylon; 2. Low volatility, will not affect the loss of antioxidants in nylon; 3. Good solubility; 4. Stability High, which can ensure the long-term effect of antioxidants in toughened nylon.

This embodiment also provides a nylon material prepared by the above-mentioned method for preparing a nylon material. The nylon material has good material toughness and strength properties, and has better performance balance.

In order to enable those skilled in the art to understand the technical solutions of the present application more clearly, the technical solutions of the present application will be described in detail below with reference to specific embodiments and comparative examples.

Example 1: Comparative Example

Weigh 3 parts of HDPE (weight parts, the same below, DuPont 50045E), 12 parts of maleic anhydride grafted ethylene octene copolymer (DuPont, N493), 81 parts of nylon 6 (Yueyang Petrochemical, YH800), 1010 parts of antioxidant (BASF ) 4.0 parts, mix the above-mentioned raw materials in a high-speed mixer for 30 minutes, add the above-mentioned mixture into the extruder hopper, at 220 ℃ ~ 260 ℃, the main screw speed is 150 rpm, and the feeding screw speed is 50 rpm The reaction is carried out under the condition of minutes, and the extrudate is drawn, cooled, dried and pelletized to obtain toughened nylon pellets.

Example 2:

Weigh 20 parts of HDPE (DuPont, 50045E), 80 parts of maleic anhydride grafted ethylene octene copolymer (DuPont, N493), HDPE, maleic anhydride grafted ethylene octene copolymer were mixed in a high-speed mixer for 30 minutes, Add the above mixture into the hopper of the extruder, the temperature of each zone of the extruder is between 140 ° C and 160 ° C, the main screw speed is 150 rpm, the feeding screw speed is 40 rpm, and the extrudate is pulled, cooled and dried. , and dicing to obtain toughening agent granules with a core-shell structure. Weigh 81 parts of nylon 6 (Yueyang Petrochemical, YH800), 15 parts of core-shell toughening agent, and 4.0 parts of antioxidant 1010, mix them in a high-speed mixer for 30 minutes, put them into the hopper of the extruder, and put them into the hopper of the extruder. Between 260°C, the main screw speed is 150 rpm, and the feeding screw speed is 50 rpm. The reaction is carried out, and the extrudate is pulled, cooled, dried, and pelletized to obtain toughened nylon particles.

Example 3:

Weigh 20 parts of LDPE (Mitsubishi Petrochemical, EC70), 80 parts of maleic anhydride grafted ethylene octene copolymer (DuPont, N493), mix LDPE, maleic anhydride grafted ethylene octene copolymer in a high-speed mixer for 30 minutes , add the above mixture into the hopper of the extruder, the temperature of each zone of the extruder is between 140 ° C and 160 ° C, the main screw speed is 150 rpm, and the feeding screw speed is 40 rpm. drying and dicing to obtain toughening agent granules with core-shell structure. Weigh 81 parts of nylon 6 (Yueyang Petrochemical, YH800), 15 parts of core-shell toughening agent, and 4.0 parts of antioxidant 1010, mix them in a high-speed mixer for 30 minutes, put them into the hopper of the extruder, and put them into the hopper of the extruder. Between 260°C, the main screw speed is 150 rpm, and the feeding screw speed is 50 rpm. The reaction is carried out, and the extrudate is pulled, cooled, dried, and pelletized to obtain toughened nylon particles.

Example 4: Comparative Example

Weigh 3 parts of HDPE (DuPont 50045E), 12 parts of maleic anhydride grafted ethylene octene copolymer (DuPont, N493), 81 parts of nylon 66 (Shenma Group, EPR27), 4.0 parts of antioxidant 1010 (BASF), The above-mentioned raw materials are mixed in a high-speed mixer for 30 minutes, and the above-mentioned mixture is added to the extruder hopper, and the reaction is carried out under the conditions of 250 ℃～270 ℃, the main screw speed is 150 rpm, and the feeding screw speed is 50 rpm. , the extrudate is drawn, cooled, dried and pelletized to obtain toughened nylon pellets.

Example 5:

Weigh 20 parts of HDPE (DuPont, 50045E), 80 parts of maleic anhydride grafted ethylene octene copolymer (DuPont, N493), HDPE, maleic anhydride grafted ethylene octene copolymer were mixed in a high-speed mixer for 30 minutes, Add the above mixture into the hopper of the extruder, the temperature of each zone of the extruder is between 140 ° C and 160 ° C, the main screw speed is 150 rpm, the feeding screw speed is 40 rpm, and the extrudate is pulled, cooled and dried. , and dicing to obtain toughening agent granules with a core-shell structure. Weigh 81 parts of nylon 66 (Shenma Group, EPR27), 15 parts of core-shell type toughening agent, and 4.0 parts of antioxidant 1010, mix them in a high-speed mixer for 30 minutes, put them into the hopper of the extruder, and put them into the hopper of the extruder. Between ~270°C, the main screw speed is 150 rpm, and the feeding screw speed is 50 rpm. The reaction is carried out, and the extrudate is pulled, cooled, dried, and pelletized to obtain toughened nylon particles.

Example 6:

Weigh 20 parts of LDPE (Mitsubishi Petrochemical, EC70), 80 parts of maleic anhydride grafted ethylene octene copolymer (DuPont, N493), mix LDPE, maleic anhydride grafted ethylene octene copolymer in a high-speed mixer for 30 minutes , add the above mixture into the hopper of the extruder, the temperature of each zone of the extruder is between 140 ° C and 160 ° C, the main screw speed is 150 rpm, and the feeding screw speed is 40 rpm. drying and dicing to obtain toughening agent granules with core-shell structure. Weigh 81 parts of nylon 66 (Shenma Group, EPR27), 15 parts of core-shell type toughening agent, and 4.0 parts of antioxidant 1010, mix them in a high-speed mixer for 30 minutes, put them into the hopper of the extruder, and put them into the hopper of the extruder. Between ~270°C, the main screw speed is 150 rpm, and the feeding screw speed is 50 rpm. The reaction is carried out, and the extrudate is pulled, cooled, dried, and pelletized to obtain toughened nylon particles.

The test results of the mechanical properties of toughened nylon 6 in Examples 1 to 3 are shown in the following table:

It can be seen from the test results of the toughened nylon 6 mechanical properties of Examples 1-3 that the tensile strength and impact strength of the toughened nylon (Example 1) obtained by blending and extruding maleic anhydride grafted POE, HDPE and nylon All are lower than the toughened nylon results of Example 2 under the same components, and the tensile strength of the nylon material toughened with HDPE in Example 1 is also lower than that of the toughened nylon with a core-shell structure and LDPE as the core (Example 3 ) tensile strength, indicating that under the same composition conditions, the toughening agent of the core-shell structure can significantly improve the impact performance of the toughened nylon, and at the same time the tensile strength and other mechanical indicators are decreased, showing a good balance of toughness and strength.

The test results of the mechanical properties of the toughened nylon 66 in Examples 4 to 6 are shown in the following table:

It can also be seen from the test results of the toughened nylon 66 mechanical properties of Examples 4 to 6 that the core-shell structure toughener also shows a good balance of toughness and strength when toughening the nylon 66 material.

Although the above embodiments describe the specific embodiments of the present invention, they do not limit the protection scope of the invention. Those skilled in the art should understand that on the basis of the technical solutions of the invention, those skilled in the art do not need to pay creative work. Various modifications or variations made are still within the protection scope of the present invention.

Claims (7)

1. a preparation method based on the core-shell nylon toughening agent of extruder technology, is characterized in that, after thermoplastic polyolefin elastomer and polyolefin are mixed uniformly, put into extruder, and the temperature of control extruder is 130 ℃. ~170°C, wherein, in parts by mass, the thermoplastic polyolefin elastomer is 5 to 95 parts, the polyolefin is 95 to 5 parts, and neither the thermoplastic polyolefin elastomer nor the polyolefin contains dimethicone. key; The thermoplastic polyolefin elastomer is one or both of maleic anhydride grafted ethylene octene copolymer and maleic anhydride grafted ethylene propylene copolymer, and the polyolefin is low density polyethylene and high density polyethylene one or both of them; Use a high-speed mixer to mix for 30 to 35 minutes; The rotating speed of the main screw of the extruder is 10-250 rpm, and the rotating speed of the feeding screw is 10-60 rpm. 2. A nylon toughening agent prepared by the method of claim 1. 3. the application of the described nylon toughening agent of claim 2 in nylon material or preparing nylon material. 4. a preparation method of nylon material, is characterized in that, putting the nylon toughening agent of claim 2, nylon, antioxidant into extruder and extruding. The preparation method according to claim 4, characterized in that, in parts by mass, 94.9-40.0 parts of nylon, 5-50 parts of nylon toughening agent according to claim 2, and 0.1-10 parts of antioxidant . 6. The preparation method according to claim 5, wherein the parameters of the extruder are: temperature between 170°C and 300°C, main screw speed of 10 to 250 rpm, and feed screw speed of 10 to 60 rev/min. 7. A nylon material prepared by the method for preparing a nylon material according to any one of claims 4 to 6.