CN112745582A - Ultrahigh impact-resistant polypropylene material and preparation method thereof - Google Patents
Ultrahigh impact-resistant polypropylene material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an ultrahigh impact polypropylene material and a preparation method thereof. The method adopts a hydrogen regulation method to produce the ultrahigh impact polypropylene material, the ethylene content of the obtained polypropylene material is more than or equal to 10wt percent, the rubber content is more than or equal to 30wt percent, the temperature is 230 ℃, and the load is 2.1The melt flow rate under 6kg is 16-24g/10min, and the impact strength of a simple beam notch at room temperature is more than 30kJ/m2The flexural modulus is larger than 900MPa, the material is odorless, and the processing requirements of automobile and household appliance materials are met.
Description
Technical Field
The invention belongs to the technical field of polypropylene materials, and particularly relates to an ultrahigh impact polypropylene material and a preparation method thereof.
Background
The European Association of Plastic Manufacturers (APME) statistics show that for every 1 wt% reduction in the weight of an automobile, 1 wt% savings can be achieved. The application of the plastic and the composite material thereof in automobiles is an effective way for realizing the lightweight of the automobiles, and the plastic is used for replacing steel to be an effective way for realizing the energy conservation and emission reduction of the automobiles.
Polypropylene (PP) and modified engineering plastics thereof are the most commonly used plastic materials in automobiles and the most used amount. PP is widely used due to its advantages of wide source, low price, low density, good chemical resistance, easy processing, etc. The PP and modified products thereof have a very wide application range in automobiles, and are applied to automobile interior trim parts and automobile exterior trim parts, wherein the interior trim parts mainly comprise parts such as automobile instrument panels, door panels, automobile seats and the like, and the exterior trim parts are mainly used for parts such as automobile bumpers, wheel covers, mud guards and the like. It is counted that the PP material used in each vehicle at present exceeds 50kg, and the usage amount of PP and modified products thereof in the vehicle is increased year by year with the technical progress.
The PP for the automobile is required to have certain toughness, and the impact-resistant PP produced by the traditional degradation method has overlarge product odor due to the introduction of a degradation agent, so that the requirements of modern automobile materials cannot be met. The hydrogen regulation method adopts hydrogen as a molecular weight regulator, hydrogen is added into a polymerization reactor, the Melt Flow Rate (MFR) of the product is continuously improved along with the increase of the adding amount of the hydrogen, and finally the impact PP product with ideal MFR is obtained. The polypropylene product prepared by adopting a hydrogen regulation method in the Innovene gas-phase polypropylene process mainly has the following defects: the production process introduces a large amount of hydrogen, so that the pressure of the reactor is difficult to control, the pipeline is easy to block, and the device is stopped; in addition, for high impact PP products, a large amount of rubber phase needs to be generated, a large amount of ethylene needs to be introduced into the second reactor, and the situation that the reaction is too violent to generate block materials often occurs, so that target products are difficult to obtain.
In view of the above disadvantages of the prior art, there is a need to develop an ultra-high impact polypropylene material and a method for preparing the same.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultrahigh impact polypropylene material and a preparation method thereof aiming at the defects of the prior art. The invention adopts a hydrogen regulation method to produce the ultra-high impact polypropylene material, the ethylene content of the obtained polypropylene material is more than or equal to 10 wt%, the rubber content is more than or equal to 30 wt%, the melt flow rate is 16-24g/10min at the temperature of 230 ℃ and under the load of 2.16kg, and the impact strength of a simple beam notch at room temperature is more than 30kJ/m2The flexural modulus is larger than 900MPa, the material is odorless, and the processing requirements of automobile and household appliance materials are met.
Therefore, the invention provides an ultra-high impact polypropylene material, which has the ethylene content of more than or equal to 10wt percent, the rubber content of more than or equal to 30wt percent, the melt flow rate of 16-24g/10min at the temperature of 230 ℃ and the load of 2.16kg, and the impact strength of a simple beam notch at room temperature of more than 30kJ/m2And the flexural modulus is more than 900 MPa.
In some preferred embodiments of the present invention, the ultra-high impact polypropylene material has an ethylene content of 13.2 wt% to 20 wt%, a rubber content of 30 wt% to 40 wt%, and a melt flow rate of 16 to 24g/10min at a temperature of 230 ℃ and a load of 2.16 kg.
The ultrahigh impact polypropylene material comprises impact-resistant copolymerized polypropylene powder, a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent; wherein, the impact-resistant copolymerized polypropylene powder is prepared by adopting a hydrogen regulation method in an Innovene gas-phase polypropylene process.
In some preferred embodiments of the present invention, the ultra-high impact polypropylene material comprises the following components in parts by weight:
the main antioxidant and the auxiliary antioxidant have the functions of preventing the material from aging and degrading, the acid absorbent has the functions of absorbing chloride ions and acid substances of residual catalyst, the antistatic agent has the function of preventing powder from caking, and the nucleating agent has the functions of promoting material crystallization and improving rigidity.
In some preferred embodiments of the present invention, the primary antioxidant comprises 3- (3, 5-bis-butyl-4-hydroxycyclohexyl) propionate; the auxiliary antioxidant comprises tris (2, 4-di-tert-butylphenyl) phosphite; the acid scavenger comprises calcium stearate; the antistatic agent comprises glyceryl monostearate; the nucleating agent comprises an organic carboxylate salt.
In some embodiments of the invention, the nucleating agent is sodium benzoate.
In some preferred embodiments of the present invention, the preparation of the impact co-polypropylene powder is carried out in a first reactor and a second reactor connected in series with each other, the preparation process comprising the steps of:
in a first reactor, in the presence of hydrogen, propylene reacts under the action of a main catalyst, a cocatalyst and an electron donor to obtain polypropylene powder;
and reacting the polypropylene powder with ethylene in the presence of hydrogen in a second reactor to obtain the impact copolymer polypropylene powder.
The cocatalyst of the present invention comprises triethylaluminum; the main catalyst comprises titanium tetrachloride loaded by a magnesium chloride carrier; the electron donors include n-butyl phthalate and isobutyl dimethoxysilane.
In some preferred embodiments of the present invention, the molar ratio of Al in the co-catalyst to Mg in the main catalyst is 6, and the molar ratio of Al in the co-catalyst to Si in the electron donor is 4.
In other preferred embodiments of the present invention, the reaction pressure of the first reactor is 2.0 to 2.4MPa, the reaction temperature is 60 to 75 ℃, and the hydrogen concentration is 0.2 v% to 0.7 v%.
In still other preferred embodiments of the present invention, the reaction pressure of the second reactor is 2.0 to 2.4MPa, the reaction temperature is 60 to 75 ℃, the hydrogen concentration is 0.07 v% to 0.12 v%, and the ethylene concentration is 20 v% to 40 v%.
In some embodiments of the present invention, the process for preparing the impact co-polypropylene powder comprises the steps of:
s1, adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.0-2.4MPa, the reaction temperature to be 60-75 ℃, and controlling the hydrogen concentration in the reactor to be 0.2-0.7 v%, thus obtaining polypropylene powder;
s2, allowing the polypropylene powder obtained in the step S1 to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.0-2.4MPa, the reaction temperature to be 60-75 ℃, the hydrogen concentration in the reactor to be 0.07-0.12 v%, and the ethylene concentration to be 20-40 v%, and obtaining the impact-resistant copolymerized polypropylene powder with the melt flow rate of 16-24g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
In a second aspect, the present invention provides a method for preparing the ultra-high impact polypropylene material according to the first aspect, which comprises the following steps:
in a first reactor, in the presence of hydrogen, propylene reacts under the action of a main catalyst, a cocatalyst and an electron donor to obtain polypropylene powder;
reacting the polypropylene powder with ethylene in the presence of hydrogen in a second reactor to obtain impact-resistant copolymerized polypropylene powder;
and mixing the impact-resistant copolymerized polypropylene powder with a main antioxidant, an auxiliary antioxidant, an acid acceptor, an antistatic agent and a nucleating agent, and extruding to obtain the ultrahigh impact-resistant polypropylene material.
In some embodiments of the present invention, the method for preparing the ultra-high impact polypropylene material comprises the following steps:
s1, adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.0-2.4MPa, the reaction temperature to be 60-75 ℃, and controlling the hydrogen concentration in the reactor to be 0.2-0.7 v%, thus obtaining polypropylene powder;
s2, allowing the polypropylene powder obtained in the step S1 to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.0-2.4MPa, the reaction temperature to be 60-75 ℃, the hydrogen concentration in the reactor to be 0.07-0.12 v%, the ethylene concentration to be 20 v-40%, and obtaining the impact-resistant copolymerized polypropylene powder with the melt flow rate of 16-24g/10min at the temperature of 230 ℃ and the load of 2.16 kg;
s3, uniformly mixing the impact-resistant co-polypropylene powder obtained in the step S2 with a mixture of a main antioxidant, an auxiliary antioxidant, an acid acceptor, an antistatic agent and a nucleating agent, and extruding the mixture by an extruder to obtain the ultrahigh impact-resistant polypropylene material.
In the above step S3, the composition of the mixture in parts by weight is as follows:
the main antioxidant comprises 3- (3, 5-dual-tert-butyl-4-hydroxycyclohexyl) propionate; the auxiliary antioxidant comprises tris (2, 4-di-tert-butylphenyl) phosphite; the acid scavenger comprises calcium stearate; the antistatic agent comprises glyceryl monostearate; the nucleating agent comprises organic carboxylate, and preferably the nucleating agent is sodium benzoate.
In the step S3, the obtained ultra-high impact polypropylene material has an ethylene content of not less than 10 wt%, a rubber content of not less than 30 wt%, a melt flow rate of 16-24g/10min at 230 ℃ and a load of 2.16kg, and a melt flow rate at room temperatureThe impact strength of the gap of the simply supported beam is more than 30kJ/m2And the flexural modulus is more than 900 MPa. Preferably, the ultra-high impact polypropylene material has an ethylene content of 13.2 wt% to 20 wt%, a rubber content of 30 wt% to 40 wt%, and a melt flow rate of 16 to 24g/10min at a temperature of 230 ℃ and a load of 2.16 kg.
In the prior art, high hydrogen concentration and high ethylene concentration are generally adopted to produce products with high fluidity and high rubber content, however, the method causes large pressure of a reactor, large production difficulty and difficult control. According to the invention, by controlling the process parameter conditions in the preparation of the polypropylene material, the purposes of reducing the hydrogen concentration of the reactor, reducing the pressure of the reactor, preventing over-violent reaction and powder agglomeration are achieved, and the polypropylene material with high melt index, high ethylene content and high rubber content can be produced. The polypropylene material prepared by the invention has excellent impact resistance, because the impact strength of the material depends on the ethylene content and the rubber content in the material.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts a hydrogen regulation method to replace a degradation method to produce the ultrahigh impact polypropylene material, controls the reaction pressure of a first reactor to be 2.0-2.4MPa, the reaction temperature to be 60-75 ℃, the hydrogen concentration in the reactor to be 0.2-0.7 v%, the reaction pressure of a second reactor to be 2.0-2.4MPa, the reaction temperature to be 60-75 ℃, the hydrogen concentration in the reactor to be 0.07-0.12 v%, the ethylene concentration to be 20 v-40 v% and prepares the impact polypropylene copolymer with the melt flow rate of 16-24g/10min in the polymerization process by controlling the Al/Mg ratio to be 6 and the Al/Si ratio to be 4. Adding antioxidant, acid absorbent, antistatic agent and nucleating agent, extruding and granulating to obtain the final product with melt flow rate of 16-24g/10min, ethylene content not less than 10 wt%, rubber content not less than 30 wt%, and impact strength of the notch of the simply supported beam not less than 50kJ/m2And the flexural modulus is more than 900 MPa.
(2) The ultrahigh impact polypropylene material prepared by the invention has improved processing performance and impact resistance, is odorless, and can be directly used in the fields of household appliances, automobiles and the like without modification, thereby reducing intermediate links and lowering production cost.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given by way of example only, and is not intended to limit the scope of the invention.
In the following examples, the primary antioxidant was 3- (3, 5-bis-butyl-4-hydroxycyclohexyl) propionate (1010); the auxiliary antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite (168); the acid absorbent is calcium stearate; the antistatic agent is glyceryl monostearate; the nucleating agent is sodium benzoate.
The polymer related data in the examples were obtained according to the following test methods:
(1) melt Flow Rate (MFR): according to GB3682, the measurement is carried out at a temperature of 230 ℃ and a load of 2.16 kg.
(2) Ethylene content: determined by known FTIR tests based on calibration with 13C-NMR.
(3) Rubber content: determined according to GB/T24282-.
(4) Tensile yield strength: measured according to GB/T1040.
(5) Impact strength of the simply supported beam notch: measured according to GB/T1043.1.
(6) Flexural modulus: measured according to GB/T9341.
Examples
Example 1
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.31 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.07 v%, and the ethylene concentration to be 30 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 16.8g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
Example 2
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.33 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.09 v%, and the ethylene concentration to be 35 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 17.3g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
Example 3
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.28 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.08 v%, and the ethylene concentration to be 32 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 16.3g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
Example 4
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.28 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.08 v%, and the ethylene concentration to be 32 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 16.4g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
Example 5
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 4 and Al/Si to be 6, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.28 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.08 v%, and the ethylene concentration to be 32 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 18.2g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
Comparative example 1
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.30 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.10 v%, and the ethylene concentration to be 30 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 18.2g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
Comparative example 2
The preparation method of the ultra-high impact polypropylene material provided in this example is as follows:
(1) the method comprises the steps of adopting an Innovene gas-phase polypropylene process, taking propylene as reaction gas, adding a main catalyst, an electron donor and a cocatalyst into a first reactor, controlling Al/Mg to be 6 and Al/Si to be 4, controlling the reaction pressure of the first reactor to be 2.2MPa, the reaction temperature to be 70 ℃, and controlling the hydrogen concentration in the reactor to be 0.8 v%, thus obtaining the polypropylene powder.
(2) And (2) allowing the polypropylene powder obtained in the step (1) to enter a second reactor through an airlock system, controlling the reaction pressure of the second reactor to be 2.2MPa, the reaction temperature to be 65 ℃, the hydrogen concentration in the reactor to be 0.10 v%, and the ethylene concentration to be 32 v%, and obtaining the impact-resistant co-polypropylene powder with the melt flow rate of 25.5g/10min at the temperature of 230 ℃ and the load of 2.16 kg.
(3) Uniformly mixing the impact-resistant copolymerized polypropylene powder obtained in the step (2) with a mixture of a main antioxidant, an auxiliary antioxidant, an acid absorbent, an antistatic agent and a nucleating agent, wherein the mixture comprises the following components in parts by weight:
(4) extruding the mixture obtained in the step (3) through an extruder to prepare the ultra-high impact polypropylene material, wherein the performance data of the ultra-high impact polypropylene material are shown in Table 1.
TABLE 1 component contents and Performance indices of the Polypropylene materials of examples 1-5 and comparative examples 1-2
As can be seen from Table 1, compared with comparative examples 1-2, the polypropylene materials produced by the hydrogen-blending method production process in examples 1-5 of the present invention have a melt flow rate of 16-24g/10min, an ethylene content of not less than 10 wt%, a rubber content of not less than 30 wt%, and a simple-supported beam notched impact strength of greater than 30 kJ/based at room temperaturem2The flexural modulus is larger than 900MPa, the material is odorless, and the processing requirements of automobile and household appliance materials are met. Compared with the comparative example 1, the polypropylene materials prepared in the embodiments 1 to 5 of the invention have high ethylene content and high rubber content, so that the impact strength of the notch of the simply supported beam is high, and a better effect is obtained.
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. The ultrahigh impact polypropylene material has ethylene content not less than 10 wt%, rubber content not less than 30 wt%, melt flow rate of 16-24g/10min at 230 deg.c and 2.16kg load, and simple beam notch impact strength at room temperature greater than 30kJ/m2And the flexural modulus is more than 900 MPa.
2. The ultra-high impact polypropylene material of claim 1, wherein the ultra-high impact polypropylene material has an ethylene content of 13.2-20 wt%, a rubber content of 30-40 wt%, and a melt flow rate of 16-24g/10min at a temperature of 230 ℃ and a load of 2.16 kg.
3. The ultra-high impact polypropylene material according to claim 1 or 2, wherein the ultra-high impact polypropylene material comprises an impact co-polypropylene powder, a primary antioxidant, a secondary antioxidant, an acid scavenger, an antistatic agent and a nucleating agent; wherein, the impact-resistant copolymerized polypropylene powder is prepared by adopting a hydrogen regulation method in an Innovene gas-phase polypropylene process.
4. The ultra-high impact polypropylene material according to any one of claims 1 to 3, comprising the following components in parts by weight:
5. the ultra-high impact polypropylene material of claim 3 or 4, wherein the primary antioxidant comprises 3- (3, 5-bis-butyl-4-hydroxycyclohexyl) propionate;
the auxiliary antioxidant comprises tris (2, 4-di-tert-butylphenyl) phosphite;
the acid scavenger comprises calcium stearate;
the antistatic agent comprises glyceryl monostearate;
the nucleating agent comprises an organic carboxylate salt.
6. The ultra-high impact polypropylene material according to any one of claims 3 to 5, wherein the preparation of the impact co-polypropylene powder is carried out in a first reactor and a second reactor connected in series to each other, the preparation method comprising the steps of:
in a first reactor, in the presence of hydrogen, propylene reacts under the action of a main catalyst, a cocatalyst and an electron donor to obtain polypropylene powder;
and reacting the polypropylene powder with ethylene in the presence of hydrogen in a second reactor to obtain the impact copolymer polypropylene powder.
7. The ultra-high impact polypropylene material of claim 6, wherein the co-catalyst comprises triethylaluminum; the main catalyst comprises titanium tetrachloride loaded by a magnesium chloride carrier; the electron donor comprises n-butyl phthalate and isobutyl dimethoxysilane;
preferably, the molar ratio of Al in the co-catalyst to Mg in the main catalyst is 6, and the molar ratio of Al in the co-catalyst to Si in the electron donor is 4.
8. The method for preparing an ultra-high impact polypropylene material according to claim 6 or 7, wherein the reaction pressure of the first reactor is 2.0 to 2.4MPa, the reaction temperature is 60 to 75 ℃, and the hydrogen concentration is 0.2 to 0.7 v%.
9. The method for preparing an ultra-high impact polypropylene material according to any one of claims 6 to 8, wherein the reaction pressure of the second reactor is 2.0 to 2.4MPa, the reaction temperature is 60 to 75 ℃, the hydrogen concentration is 0.07 to 0.12 v%, and the ethylene concentration is 20 to 40 v%.
10. A method for preparing an ultra-high impact polypropylene material according to any one of claims 1 to 9, comprising the steps of:
in a first reactor, in the presence of hydrogen, propylene reacts under the action of a main catalyst, a cocatalyst and an electron donor to obtain polypropylene powder;
reacting the polypropylene powder with ethylene in the presence of hydrogen in a second reactor to obtain impact-resistant copolymerized polypropylene powder;
and mixing the impact-resistant copolymerized polypropylene powder with a main antioxidant, an auxiliary antioxidant, an acid acceptor, an antistatic agent and a nucleating agent, and extruding to obtain the ultrahigh impact-resistant polypropylene material.
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