CN113388189B - Polypropylene composition, polypropylene material, preparation method and application thereof - Google Patents
Polypropylene composition, polypropylene material, preparation method and application thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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Abstract
The invention relates to the field of polyolefin materials, in particular to a polypropylene composition, a polypropylene material, and a preparation method and application thereof. The polypropylene composition contains homopolymerized polypropylene, random copolymerization polypropylene, glass fiber, compatilizer and antioxidant; the content of the homopolymerized polypropylene is (40-85) wt%, the content of the random copolymerization polypropylene is (5-30) wt%, the content of the glass fiber is (5-20) wt%, the content of the compatilizer is (0.5-8) wt%, and the content of the antioxidant is (0.2-3.5) wt%. The winding storage tank made of the polypropylene material can store high-temperature liquid with the temperature of more than 100 ℃ and even up to 140 ℃, and has excellent other comprehensive properties.
Description
Technical Field
The invention relates to the field of polyolefin materials, in particular to a polypropylene composition, a polypropylene material prepared from the polypropylene composition, and a preparation method and application of the polypropylene composition.
Background
The plastic storage tank is important liquid storage and conveying equipment in the chemical industry, and compared with the traditional metal storage tank, the plastic storage tank has the characteristics of corrosion resistance, temperature resistance, long service life, strong design, convenience in integral transportation and installation and the like.
The winding storage tank is a large plastic storage tank, and the advanced winding forming process is adopted, so that the characteristics of uncontrollable process, poor integrity and the like caused by manual welding of the traditional storage tank are avoided, the winding storage tank has the characteristics of better integrity, leakage resistance, high weld strength, no flash and the like, and the defects of short service life, poor sanitation, high maintenance cost and the like of the traditional storage tank are overcome. At present, the method is widely applied to the storage and transportation of organic and inorganic acid and alkali salt in the industries of food, smelting, chemical printing and dyeing, pigment and the like.
At present, the winding storage tank is mostly produced by low-fluidity homo-polypropylene (PPH), can store liquid at the maximum temperature of 90 ℃, and does not have the winding storage tank with the heat-resistant temperature higher than 100 ℃. However, with the increasing proportion of wound storage tanks in the plastic storage tank industry, there is a desire in the high temperature service industry for wound storage tanks capable of holding liquids at temperatures above 100 ℃ and even up to 140 ℃.
Therefore, the polypropylene material which can resist high temperature and has excellent other properties is obtained, and is very important for promoting the winding storage tank to be applied in the high-temperature working condition industry.
Disclosure of Invention
The invention aims to overcome the defect that the existing winding storage tank cannot store high-temperature liquid with the temperature of more than 100 ℃, and provides a polypropylene composition, a polypropylene material prepared from the polypropylene composition, and a preparation method and application of the polypropylene material.
When the polypropylene composition is used for preparing the winding storage tank, the prepared winding storage tank can realize the excellent effect of storing high-temperature liquid with the temperature of more than 100 ℃ and even up to 140 ℃ on the premise of ensuring the excellent comprehensive performance.
In order to achieve the above object, the first aspect of the present invention provides a polypropylene composition, which comprises homo-polypropylene, random co-polypropylene, glass fiber, a compatibilizer, and an antioxidant; based on the total weight of the polypropylene composition, the content of the homopolymerized polypropylene is (40-85) weight percent, the content of the random copolymerization polypropylene is (5-30) weight percent, the content of the glass fiber is (5-20) weight percent, the content of the compatilizer is (0.5-8) weight percent, and the content of the antioxidant is (0.2-3.5) weight percent.
In a second aspect, the present invention provides a process for preparing a polypropylene material, the process comprising: the components of the polypropylene composition of the first aspect of the present invention are sequentially melt blended and cured to form the polypropylene composition.
In a third aspect the present invention provides a polypropylene material obtainable by the process of the second aspect of the present invention.
In a fourth aspect the present invention provides the use of a polypropylene composition according to the first aspect of the present invention and/or a polypropylene material according to the third aspect of the present invention for the manufacture of a wound tank.
Through the technical scheme, the polypropylene material disclosed by the invention at least has the following advantages:
(1) the prepared winding storage tank can resist high-temperature liquid with the temperature of more than 100 ℃ without deformation, and can resist high-temperature liquid with the temperature of 140 ℃ under the optimal condition;
(2) the prepared winding storage tank has good comprehensive performances such as chemical corrosion resistance, oxidation resistance, mechanical property, long-term creep resistance and the like.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a polypropylene composition, which contains homopolymerized polypropylene, random copolymerization polypropylene, glass fiber, compatilizer and antioxidant; based on the total weight of the polypropylene composition, the content of the homopolymerized polypropylene is (40-85) weight percent, the content of the random copolymerization polypropylene is (5-30) weight percent, the content of the glass fiber is (5-20) weight percent, the content of the compatilizer is (0.5-8) weight percent, and the content of the antioxidant is (0.2-3.5) weight percent.
In the present invention, preferably, the polypropylene composition further comprises a light stabilizer and a color master batch, based on the total weight of the polypropylene composition, the content of the homo-polypropylene is (50-75) wt%, the content of the random co-polypropylene is (10-25) wt%, the content of the glass fiber is (10-18) wt%, the content of the compatibilizer is (0.8-3) wt%, the content of the antioxidant is (0.3-0.9) wt%, the content of the light stabilizer is (0.05-0.3) wt%, and the content of the color master batch is (1.5-3) wt%.
More preferably, based on the total weight of the polypropylene composition, the content of the homo-polypropylene is (60-70) wt%, the content of the random co-polypropylene is (12-20) wt%, the content of the glass fiber is (12-15) wt%, the content of the compatibilizer is (1-2) wt%, the content of the antioxidant is (0.5-0.8) wt%, the content of the light stabilizer is (0.1-0.25) wt%, and the content of the color master batch is (1.5-3) wt%.
In the present invention, in order to further improve the heat resistance and other overall properties of the resulting polypropylene material, it is preferable that the homopolypropylene has a melt index MI measured at 230 ℃ and under a load of 2.16kg Are all made of Is (0.05-3) g/10min, more preferably (0.1-0.4) g/10 min.
In the present invention, preferably, the homo-polypropylene has a density ρ Are all made of Is (0.895-0.908) g/cm 3 More preferably (0.902-0.905) g/cm 3 。
In the present invention, the melting temperature of the homopolypropylene is preferably 155-165 ℃, more preferably 160-164 ℃.
In the present invention, in order to further improve the heat resistance and other overall properties of the obtained polypropylene material, according to a preferred embodiment of the present invention, the homopolypropylene comprises a first homopolypropylene and a second homopolypropylene, the melt index of the first homopolypropylene and the second homopolypropylene measured at 230 ℃ and under a 2.16kg load is (0.05 to 0.4) g/10min (more preferably (0.1 to 0.3) g/10min), and the first homopolypropylene and the second homopolypropylene satisfy at least one of the following conditions:
(a) the difference between the melt indices of the first homopolypropylene and the second homopolypropylene measured at 230 ℃ and under a load of 2.16kg is MI 1 -MI 2 And MI is not less than 0.1g/10min 1 -MI 2 MI of 0.3g/10min or less (more preferably 0.1g/10min or less) 1 -MI 2 ≤0.2g/10min)；
(b) The difference between the densities of the first homo-polypropylene and the second homo-polypropylene is rho 1 -ρ 2 And 0.01g/cm 3 ≤ρ 1 -ρ 2 ≤0.03g/cm 3 (more preferably 0.01 g/cm) 3 ≤ρ 1 -ρ 2 ≤0.02g/cm 3 ) (ii) a (c) The difference between the melting temperatures of the first homo-polypropylene and the second homo-polypropylene is Tm 1 -Tm 2 And Tm is less than or equal to 1.5 DEG C 1 -Tm 2 6 ℃ (more preferably 2 ℃ Tm or less) 1 -Tm 2 ≤4℃)。
In the above preferred embodiment, MI 1 Refers to the melt index, MI, of the first homopolypropylene measured at 230 ℃ and under a 2.16kg load 2 Means the melt index, further preferably the MI, of said second homopolypropylene measured at 230 ℃ and under a load of 2.16kg 1 Is (0.25-0.4) g/10min, MI 2 Is (0.05-0.2) g/10min, and MI is not less than 0.1g/10min 1 -MI 2 Less than or equal to 0.3g/10 min; still further preferably, MI 1 Is (0.25-0.35) g/10min, MI 2 Is (0.1-0.2) g/10min, and MI is not less than 0.05g/10min 1 -MI 2 ≤0.2g/10min。
In the above preferred embodiment, ρ 1 Refers to the density, p, of the first homopolypropylene 2 Refers to the density of the second homopolypropylene, further preferably, ρ 1 Is (0.904-0.905) g/cm 3 ，ρ 2 Is (0.902-0.903) g/cm 3 And 0.01g/cm 3 ≤ρ 1 -ρ 2 ≤0.02g/cm 3 。
In the above preferred embodiments, Tm 1 Refers to the melting temperature, Tm, of the first homopolypropylene 2 Refers to the melting temperature of the second homopolypropylene, and furtherPreferably, Tm 1 Is (163- 2 Is (160-162) DEG C and Tm is more than or equal to 2 DEG C 1 －Tm 2 ≤4℃。
In the present invention, when the properties of the first and second homopolypolypropylenes have any one of the above-described melt index, density and melting temperature measured at 230 ℃ and under a load of 2.16kg, the heat resistance and other overall properties of the resulting polypropylene material can be effectively improved; more preferably, the properties of the first and second homopolypropylene correspond to the two characteristics of melt index, density and melt temperature, measured at 230 ℃ and under a 2.16kg load, as described above; in a further preferred case, the properties of the first and second homo-polypropylenes simultaneously comply with the above-mentioned characteristics of melt index, density and melt temperature measured at 230 ℃ and under a load of 2.16 kg.
In the present invention, in order to further improve the heat resistance and other overall properties of the obtained polypropylene material, it is preferable that the first homopolypropylene is present in an amount of (35 to 50) wt% and the second homopolypropylene is present in an amount of (18 to 32) wt%, based on the total weight of the polyolefin composition; more preferably, the first homopolypropylene is present in an amount of (40 to 45) wt% and the second homopolypropylene is present in an amount of (20 to 30) wt%, based on the total weight of the polyolefin composition.
In the present invention, the random copolymer polypropylene is obtained by copolymerizing a propylene monomer and an ethylene monomer, and preferably, the content of the ethylene structural unit in the random copolymer polypropylene is (1 to 7) wt%, more preferably (3 to 5) wt%, based on the total weight of the random copolymer polypropylene.
In the present invention, preferably, the melt index MI of the random copolymerized polypropylene is measured at 230 ℃ and under a load of 2.16kg Is free of Is (0.2-0.4) g/10min, more preferably (0.25-0.35) g/10 min.
In the present invention, preferably, the density ρ of the random copolymerized polypropylene Is free of Is (0.897-0.9) g/cm 3 More preferably (0.897-0.899) g/cm 3 。
In the present invention, the melting temperature of the random copolymerized polypropylene is preferably (140-150) deg.C, more preferably (143-146 deg.C).
In the present invention, preferably, the glass fiber is a chopped alkali-free glass fiber. The term "chopped alkali-free glass fibers" is a conventional term in the art and refers to non-continuous glass fibers having an alkali metal oxide content of less than 0.8 weight percent.
In the present invention, the glass fiber preferably has a fiber length of (2 to 6) mm, more preferably (3 to 4.5) mm.
In the present invention, the glass fiber preferably has a fiber diameter of (5 to 20) μm, more preferably (10 to 15) μm.
In the present invention, the compatibilizer may be any of those conventionally used in the art in combination with polyolefins. Preferably, the compatilizer is grafted polypropylene, and the grafting rate is 1-5%.
In the present invention, preferably, the compatibilizer is selected from one or more of polypropylene grafted maleic anhydride, polyethylene grafted maleic anhydride and polypropylene grafted acrylic acid, and most preferably polypropylene grafted maleic anhydride.
In the present invention, preferably, the compatibilizer is polypropylene grafted maleic anhydride, and the melt index MI of the polypropylene grafted maleic anhydride measured at 230 ℃ and under a 2.16kg load is Container Is (2-15) g/10min, more preferably (6-10) g/10 min.
In the present invention, the antioxidant may be any of various antioxidants conventionally used in the art in combination with polyolefins, for example, the antioxidant may be selected from one or more of hindered phenol antioxidants, phosphite antioxidants and thioester antioxidants.
In the invention, in order to further improve the heat resistance and other comprehensive properties of the obtained polypropylene material, preferably, the antioxidants are hindered phenol antioxidants, phosphite antioxidants and thioester antioxidants, and the content weight ratio of the hindered phenol antioxidants, sulfite antioxidants and thioester antioxidants in the antioxidants is 1 (0.1-6) to (0.05-5), preferably 1 (0.25-4) to (0.15-3), more preferably 1 (0.5-2) to (0.25-2).
In the present invention, the hindered phenol antioxidant preferably has a melting point of (100-260 ℃ C.), more preferably (150-200 ℃ C.).
Further preferably, the hindered phenol antioxidant is selected from the group consisting of pentaerythrityl tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], (2,4, 6-trioxo-1, 3, 5-triazine-1, 3,5(2H,4H,6H) -triyl) trivinyltris [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,3, 5-tris (4-tert-butyl-3 hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione, and one or more of 1,3,5- (3, 5-di-tert-butyl-4-hydroxybenzyl) -s-triazine-2, 4,6- (1H,3H,5H) -trione.
In the present invention, the melting point of the phosphite antioxidant is preferably greater than 160 deg.C, more preferably (160-180 deg.C).
Further preferably, the phosphite antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite and/or pentaerythritol diphosphite bis (2, 4-di-tert-butylphenyl) ester.
In the present invention, preferably, the thioester antioxidant is dioctadecyl thiodipropionate and/or dilauryl thiodipropionate.
In the present invention, the light stabilizer may be any of various light stabilizers conventionally used in combination with polyolefins in the art. Preferably, the light stabilizer is selected from bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (i.e. "light stabilizer 770", CAS No. 52829-07-9); a polymer of succinic acid and (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol) (i.e., "light stabilizer 622", CAS No. 70198-29-7); one or more of poly- { [6- (1,1,3, 3-tetramethylbutyl) -imino ] -1,3, 5-triazine-2, 4-diyl } [2- (2,2,6, 6-tetramethylpiperidinyl) -amino ] -hexylene- [4- (2,2,6, 6-tetramethylpiperidinyl) -imino ] (i.e. "light stabilizer HS-944", CAS No. 70624-18-9). The above-mentioned preferred light stabilizer can produce a good synergistic effect with other components of the present invention, so that the light stabilizing effect can be exerted more effectively, and the effect of promoting the heat resistance and other comprehensive properties of the obtained polypropylene material can be exerted.
In the present invention, the color master batch is not particularly limited, and a commercially available color master batch, which is generally gray, may be used.
In the present invention, the composition may further contain other adjuvants as long as the properties of other components are not adversely affected, including but not limited to at least one of flame retardants, slip agents, antistatic agents, lubricants, plasticizers, and the like. In addition, the amount of the other auxiliary agents is selected conventionally in the field, and can be known by those skilled in the art.
In a second aspect, the present invention provides a process for preparing a polypropylene material, the process comprising: the components of the polypropylene composition of the first aspect of the present invention are sequentially melt blended and cured to form the polypropylene composition.
In the present invention, the method includes, for example: the polypropylene composition according to the first aspect of the present invention is obtained by extrusion-pelletization (the extrusion pelletization process includes melt blending and solidification molding) using a twin-screw extruder, and the processing temperature of the twin-screw extruder is, for example, (220-.
In a third aspect the present invention provides a polypropylene material obtainable by the process of the second aspect of the present invention.
In a fourth aspect the present invention provides the use of a polypropylene composition according to the first aspect of the present invention and/or a polypropylene material according to the third aspect of the present invention for the manufacture of a wound tank. The method for preparing the winding storage tank is carried out according to a conventional winding forming process.
The present invention will be described in detail below by way of examples. In the following examples, 1 part by weight represents 1 g.
The relevant data were obtained as follows:
(1) melt index MI: the measurement is carried out according to the method specified in GB/T3682-2000, wherein the test temperature is 230 ℃, and the load is 2.16 kg;
(2) density: measuring by a density gradient column method according to a method specified in GB/T1033.2-2010;
(3) melting temperature: the measurement was carried out according to the method defined in GB/T19466.3-2004.
Preparation example
In the following examples, homo-polypropylene and random copolymer polypropylene were used in order to adjust to desired different parameters, and the specific procedures and parameters were performed according to conventional methods in the art, including the following operations:
(1) preparation method of homo-polypropylene
Propylene and hydrogen (both of polymerization grade, used after water and oxygen removal) were added to the reactor, and the catalyst system was added, followed by polymerization in a reactor at about 66 ℃ and 2.2 MPa. And (3) carrying out monomer separation on polymer powder obtained by polymerization reaction, removing residual catalyst in a degassing bin, and conveying to an extrusion granulation system for granulation. In the preparation process, the control of the melt index is realized by adjusting the adding amount of hydrogen, the control of the density is realized by adjusting the type and the adding amount of the cocatalyst, and the control of the melting temperature is realized by adjusting the reaction temperature.
(2) Preparation method of random copolymerization polypropylene
Propylene, ethylene, hydrogen (all polymer grade, used after removing water and oxygen) were added to the reactor, and the catalyst system was added, followed by polymerization in a reactor at about 66 ℃ and 2.2 MPa. And (3) carrying out monomer separation on polymer powder obtained by polymerization reaction, removing residual catalyst in a degassing bin, and conveying to an extrusion granulation system for granulation. In the preparation process, the control of the content of the ethylene structural unit is realized by adjusting the adding amount of the ethylene monomer, the control of the melt index is realized by adjusting the adding amount of the hydrogen, the control of the density is realized by adjusting the type and the adding amount of the cocatalyst, and the control of the melting temperature is realized by adjusting the reaction temperature.
Example 1
The first step is as follows: a polyolefin composition was prepared with the following components and amounts:
(1) homo-polypropylene: 69.8 parts by weight in total, including:
first homo-polypropylene: 40 parts by weight; the melt index is 0.3g/10min, the density is 0.904g/10min, and the melting temperature is 164 ℃;
second homo-polypropylene: 29.8 parts by weight; the melt index is 0.15g/10min, the density is 0.902g/10min, and the melting temperature is 162 ℃;
(2) random copolymerized polypropylene: 16 parts by weight; a melt index of 0.3g/10min, a density of 0.897g/10min, a melting temperature of 144 ℃ and a content of ethylene structural units of 5% by weight;
(3) chopped alkali-free glass fibers: 12 parts by weight; taishan glass fiber, T438H; the fiber length is 4.5mm, the fiber diameter is 13 μm, and the same below;
(4) a compatilizer: 1.5 parts by weight; the polypropylene is grafted with maleic anhydride, Shanghai Yuanyuan, A018, the melt index is 70g/10min, the grafting rate is 1 percent, and the same is below;
(5) antioxidant: 0.5 part by weight in total, comprising:
hindered phenol antioxidant: 0.2 part by weight of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ];
sulfite antioxidant: 0.15 part by weight of tris (2, 4-di-tert-butylphenyl) phosphite;
thioester type antioxidant: 0.15 part by weight of dioctadecyl thiodipropionate;
(6) light stabilizer: 0.2 part by weight of light stabilizer 622, available from tianjinliu anlong;
(7) color master batch: 2 parts by weight.
The second step is that: the polypropylene material was prepared according to the following procedure:
the polypropylene composition prepared in the first step was put into a high speed mixer, mixed for 90 seconds at a mixing speed of 1500 rpm, and then the mixed polypropylene composition was put into a twin screw extruder having a diameter of 75mm and an aspect ratio of 42:1, and extrusion-pelletized at a processing temperature of 240 ℃ to obtain a polypropylene material, which was designated as S1.
Example 2
The first step is as follows: a polyolefin composition was prepared with the following components and amounts:
(1) homo-polypropylene: 67.95 parts by weight in total, comprising:
first homo-polypropylene: 45 parts by weight; the melt index is 0.3g/10min, the density is 0.904g/10min, and the melting temperature is 164 ℃;
second homo-polypropylene: 22.95 parts by weight; the melt index is 0.1g/10min, the density is 0.902g/10min, and the melting temperature is 162 ℃;
(2) random copolymerized polypropylene: 12 parts by weight; a melt index of 0.25g/10min, a density of 0.898g/10min, a melting temperature of 145 ℃, and a content of ethylene structural units of 3 wt%;
(3) chopped alkali-free glass fibers: 15 parts by weight; taishan glass fiber, T438H; the fiber length is 4.5mm, and the fiber diameter is 13 μm;
(4) a compatilizer: 2 parts by weight of polypropylene grafted with maleic anhydride;
(5) antioxidant: 0.8 parts by weight in total, comprising:
hindered phenol antioxidant: 0.2 part by weight of 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene;
sulfite antioxidant: 0.2 part by weight of pentaerythritol diphosphite bis (2, 4-di-tert-butylphenyl) ester;
thioester-based antioxidant: 0.4 part by weight of dilauryl thiodipropionate;
(6) light stabilizer: 0.25 part by weight of light stabilizer HS-944, purchased from Tianjinlianlong;
(7) color master batch: 2 parts by weight.
The second step is the same as in example 1.
The resulting polypropylene material was designated as S2.
Example 3
The first step is as follows: a polyolefin composition was prepared with the following components and amounts:
(1) homo-polypropylene: in total 63.2 parts by weight, including:
first homo-polypropylene: 43 parts by weight; the melt index is 0.3g/10min, the density is 0.905g/10min, and the melting temperature is 164 ℃;
second homo-polypropylene: 20.2 parts by weight; the melt index is 0.2g/10min, the density is 0.903g/10min, and the melting temperature is 160 ℃;
(2) random copolymer polypropylene: 20 parts by weight; a melt index of 0.35g/10min, a density of 0.897g/10min, a melting temperature of 145 ℃, and a content of ethylene structural units of 4 wt%;
(3) chopped alkali-free glass fibers: 13 parts by weight; taishan glass fiber, T438H; the fiber length is 4.5mm, and the fiber diameter is 13 μm;
(4) a compatilizer: 1 part by weight of polypropylene grafted maleic anhydride;
(5) antioxidant: 0.7 parts by weight in total, comprising:
hindered phenol antioxidant: 0.4 part by weight of 1,3,5- (3, 5-di-tert-butyl-4-hydroxybenzyl) -s-triazine-2, 4,6- (1H,3H,5H) -trione;
sulfite antioxidant: 0.2 part by weight of tris (2, 4-di-tert-butylphenyl) phosphite and pentaerythritol diphosphite bis (2, 4-di-tert-butylphenyl) ester in a weight ratio of 1: 1;
thioester type antioxidant: 0.1 part by weight of dioctadecyl thiodipropionate and dilauryl thiodipropionate in a weight ratio of 1: 1;
(6) light stabilizer: 0.1 parts by weight of a light stabilizer 770, available from basf;
(7) color master batch: 2 parts by weight.
The second step is the same as in example 1.
The resulting polypropylene material was designated as S3.
Example 4
The procedure of example 1 was followed, except that the 69.8 parts by weight of homopolypropylene was all the first homopolypropylene of example 1.
The resulting polypropylene material was designated as S4.
Example 5
The procedure of example 1 was followed, except that the 69.8 parts by weight of homopolypropylene was entirely the second homopolypropylene of example 1.
The resulting polypropylene material was designated as S5.
Example 6
The procedure of example 1 was followed, except that, instead of the kinds of the first homopolypropylene and the second polypropylene, specifically, the first homopolypropylene and the second polypropylene used in this example were as follows:
first homo-polypropylene: 40 parts by weight; the melt index is 0.4g/10min, the density is 0.906g/10min, and the melting temperature is 165 ℃;
second homo-polypropylene: 29.8 parts by weight; the melt index is 0.1g/10min, the density is 0.900g/10min, and the melting temperature is 160 ℃.
The resulting polypropylene material was designated S6.
Example 7
The procedure of example 1 was followed, except that the compounding ratio of the first homopolypropylene to the second homopolypropylene was adjusted, specifically, 29.8 parts by weight of the first homopolypropylene and 40 parts by weight of the second homopolypropylene.
The resulting polypropylene material was designated S7.
Example 8
The procedure is as in example 1, except that the contents of the components are adjusted, in particular: 77.8 parts by weight of homopolymerized polypropylene (with constant internal proportion), 8 parts by weight of random copolymerization polypropylene, 10 parts by weight of chopped alkali-free glass fiber, 1.5 parts by weight of compatilizer, 0.5 part by weight of antioxidant (with constant internal proportion), 0.2 part by weight of light stabilizer and 2 parts by weight of color master batch.
The resulting polypropylene material was designated as S8.
Example 9
The procedure is as in example 1, except that the chopped alkali-free glass fibers are replaced with chopped alkali-free glass fibers having a fiber length of 2mm and a fiber diameter of 5 μm.
The resulting polypropylene material was designated as S9.
Comparative example 1
The procedure was followed as in example 1, except that no random copolymerized polypropylene was added, and the total weight of the homopolypropylene was changed to 85.8 parts by weight, wherein the ratio of the first homopolypropylene to the second homopolypropylene was not changed.
The resulting polypropylene material was designated as D1.
Comparative example 2
The procedure is as in example 1, except that the contents of the components are adjusted, in particular: 35 parts of homopolymerized polypropylene (with constant internal proportion), 50.8 parts of random copolymerization polypropylene, 10 parts of short alkali-free glass fiber, 1.5 parts of compatilizer, 0.5 part of antioxidant (with constant internal proportion), 0.2 part of light stabilizer and 2 parts of color master batch.
The resulting polypropylene material was designated as D2.
Test example
The polypropylene materials obtained above were subjected to the following tests, and the results are shown in table 1.
(1) Deformation temperature under load (0.45 MPa): measured according to the method specified in the national standard GB/T1634, the test condition is 0.45 MPa;
(2) tensile strength: measured according to the method specified in the national standard GB/T1040;
(3) flexural modulus: measured according to the method specified in the national standard GB/T1040;
(4) impact strength of simply supported beam notch (23 ℃): the test temperature is 23 ℃ measured according to the method specified in the national standard GB/T1043;
(5) oxidation induction time: measured according to the method specified in the national standard GB/T19466.6-2009.
TABLE 1
As can be seen from Table 1, the polypropylene material obtained from the polypropylene composition of the present invention can withstand a high temperature liquid of 100 ℃ or higher without deformation, and in the preferred case, can withstand a high temperature liquid of 140 ℃, and the withstand temperature is much higher than that of the comparative example.
In addition, the invention also refers to a method for measuring the deformation temperature under load, a 75 weight percent sulfuric acid solution and a 70 weight percent NaOH solution are respectively used for replacing the liquid used in the measuring method, the deformation temperature under load is tested, and the result shows that the polypropylene material has almost no difference with the result of the deformation temperature under load in the table 1, and the polypropylene material also has good acid-base resistance and chemical corrosion resistance.
Moreover, the result of the oxidation induction time shows that the polypropylene material has good oxidation resistance, and the tensile strength, the bending modulus and the impact strength of the notch of the simply supported beam show that the polypropylene material has good mechanical property and long-term creep resistance. Therefore, the polypropylene material of the invention has good comprehensive performance and is superior to a comparative example.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (17)
1. A polypropylene composition contains homopolymerized polypropylene, random copolymerization polypropylene, glass fiber, compatilizer, antioxidant, light stabilizer and color master batch; based on the total weight of the polypropylene composition, the content of the homo-polypropylene is (60-70) wt%, the content of the random copolymerization polypropylene is (12-20) wt%, the content of the glass fiber is (12-15) wt%, the content of the compatilizer is (1-2) wt%, the content of the antioxidant is (0.5-0.8) wt%, the content of the light stabilizer is (0.1-0.25) wt%, and the content of the color master batch is (1.5-3) wt%;
the homo-polypropylene comprises a first homo-polypropylene and a second homo-polypropylene, the first homo-polypropylene and the second homo-polypropylene having a melt index of (0.05-0.4) g/10min measured at 230 ℃ and under a 2.16kg load, and the first homo-polypropylene and the second homo-polypropylene satisfying at least one of the following conditions:
(a) the first homopolypropylene and the second homopolypolypropyleneThe difference between the melt indices of the olefins measured at 230 ℃ and under a load of 2.16kg is MI 1 -MI 2 And MI is not less than 0.1g/10min 1 -MI 2 ≤0.3g/10min；
(b) The difference between the densities of the first homo-polypropylene and the second homo-polypropylene is rho 1 -ρ 2 And 0.01g/cm 3 ≤ρ 1 -ρ 2 ≤0.03g/cm 3 ；
(c) The difference between the melting temperatures of the first homo-polypropylene and the second homo-polypropylene is Tm 1 -Tm 2 And Tm is not more than 1.5 DEG C 1 -Tm 2 ≤6℃。
2. The polypropylene composition according to claim 1, wherein the homopolypropylene has a melt index MI, measured at 230 ℃ and under a load of 2.16kg Are all made of Is (0.1-0.4) g/10min, density rho Are all made of Is (0.902-0.905) g/cm 3 。
3. The polypropylene composition according to claim 1, wherein when the first and second homo-polypropylenes satisfy condition (c), the difference between the melting temperatures of the first and second homo-polypropylenes is Tm 1 -Tm 2 And Tm is not more than 2 DEG C 1 -Tm 2 ≤4℃。
4. The polypropylene composition according to claim 3, wherein the first homopolypropylene has a melt index MI, measured at 230 ℃ and under a load of 2.16kg 1 (0.25-0.4) g/10min, a melt index MI of the second homopolypropylene measured at 230 ℃ and under a load of 2.16kg 2 Is (0.05-0.2) g/10min, and MI is not less than 0.1g/10min 1 -MI 2 ≤0.3g/10min。
5. The polypropylene composition according to claim 4, wherein the first homo-polypropylene has a density p 1 Is (0.904-0.905) g/cm 3 Density p of the second homo-polypropylene 2 Is (0.902-0.903) g/cm 3 And 0.01g/cm 3 ≤ρ 1 -ρ 2 ≤0.02g/cm 3 。
6. The polypropylene composition according to claim 4, wherein the first homo-polypropylene has a melting temperature Tm 1 Is (163-164) DEG C, and the melting temperature Tm of the second homo-polypropylene 2 Is (160-162) DEG C and Tm is more than or equal to 2 DEG C 1 -Tm 2 ≤4℃。
7. The polypropylene composition according to claim 3, wherein the first homopolypropylene is present in an amount of (35-50) wt. -%, and the second homopolypropylene is present in an amount of (18-32) wt. -%, based on the total weight of the polypropylene composition.
8. The polypropylene composition according to claim 7, wherein the first homopolypropylene is present in an amount of (40-45) wt. -%, and the second homopolypropylene is present in an amount of (20-30) wt. -%, based on the total weight of the polypropylene composition.
9. The polypropylene composition according to any one of claims 1 to 8, wherein the random copolymer polypropylene has an ethylene structural unit content of (1 to 7) wt%, based on the total weight of the random copolymer polypropylene.
10. The polypropylene composition according to claim 9, wherein the random copolymer polypropylene has a melt index MI measured at 230 ℃ and under a load of 2.16kg Is free of Is (0.2-0.4) g/10min, density rho Is free of Is (0.897-0.9) g/cm 3 。
11. The polypropylene composition according to any one of claims 1 to 8, wherein the glass fibers are chopped alkali-free glass fibers having a fiber length of (2-6) mm and a fiber diameter of (5-20) μm.
12. The polypropylene composition according to any one of claims 1 to 8, wherein the compatibilizing agent is selected from one or more of polypropylene grafted maleic anhydride, polyethylene grafted maleic anhydride and polypropylene grafted acrylic acid.
13. The polypropylene composition according to any one of claims 1 to 8, wherein the antioxidant is a hindered phenolic antioxidant, a phosphite antioxidant and a thioester antioxidant, and the weight ratio of the hindered phenolic antioxidant, the phosphite antioxidant and the thioester antioxidant in the antioxidant is 1 (0.1-6) to (0.05-5).
14. The polypropylene composition according to any one of claims 1 to 8, wherein the light stabilizer is selected from one or more of bis (2,2,6, 6-tetramethyl-4-piperidinyl) sebacate, a polymer of succinic acid with (4-hydroxy-2, 2,6, 6-tetramethyl-1-piperidinol) and poly- { [6- (1,1,3, 3-tetramethylbutyl) -imino ] -1,3, 5-triazin-2, 4-diyl } [2- (2,2,6, 6-tetramethylpiperidinyl) -amino ] -hexylene- [4- (2,2,6, 6-tetramethylpiperidinyl) -imino ].
15. A method of making a polypropylene material, the method comprising: the polypropylene composition according to any one of claims 1 to 14, wherein the components are melt blended and solidified in sequence.
16. A polypropylene material produced by the process of claim 15.
17. Use of the polypropylene composition according to any one of claims 1 to 14 and/or the polypropylene material according to claim 16 for the preparation of wound tanks.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102181096A (en) * | 2011-04-22 | 2011-09-14 | 松下家电研究开发（杭州）有限公司 | Glass fiber reinforced polypropylene material and preparation method thereof |
| JP2016222888A (en) * | 2015-05-29 | 2016-12-28 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | Polypropylene resin composition having excellent transparency and heat resistance |
| CN107236189A (en) * | 2017-06-26 | 2017-10-10 | 吉利汽车研究院（宁波）有限公司 | Low-density Long Glass Fiber Reinforced PP Composite and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102181096A (en) * | 2011-04-22 | 2011-09-14 | 松下家电研究开发（杭州）有限公司 | Glass fiber reinforced polypropylene material and preparation method thereof |
| JP2016222888A (en) * | 2015-05-29 | 2016-12-28 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | Polypropylene resin composition having excellent transparency and heat resistance |
| CN107236189A (en) * | 2017-06-26 | 2017-10-10 | 吉利汽车研究院（宁波）有限公司 | Low-density Long Glass Fiber Reinforced PP Composite and preparation method thereof |
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