CN113121911A - High-transparency polypropylene composition - Google Patents
High-transparency polypropylene composition Download PDFInfo
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- CN113121911A CN113121911A CN201911388911.5A CN201911388911A CN113121911A CN 113121911 A CN113121911 A CN 113121911A CN 201911388911 A CN201911388911 A CN 201911388911A CN 113121911 A CN113121911 A CN 113121911A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/156—Heterocyclic compounds having oxygen in the ring having two oxygen atoms in the ring
- C08K5/1575—Six-membered rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
Abstract
The invention discloses a high-transparency polypropylene composition which comprises the following components in parts by mass: 100 parts of isotactic polypropylene, 0.01-2 parts of modified nucleating agent, 0.01-1 part of antioxidant and 0.01-1 part of light stabilizer; the modified nucleating agent consists of a sorbitol derivative without hydroxyl and a sorbitol nucleating agent. The hydroxyl-free sorbitol derivative has higher recognition efficiency of non-covalent action between derivative molecules and nucleating agent molecules due to the retention of the original hydrogen bond and pi-pi action recognition site structure, and better combination, and meanwhile, the hydroxyl-free sorbitol derivative molecules are organic small molecules and are easier to disperse in polypropylene resin, so that the composite modified nucleating agent can realize the good improvement effect on the performances of polypropylene, such as grain refinement, fog, modulus and the like, while having no gelation effect.
Description
Technical Field
The invention relates to a high-transparency polypropylene composition, belonging to the field of high-molecular composite materials.
Background
The polypropylene PP is one of five general-purpose plastics, has rich raw material sources, low price, easy processing and forming and excellent product comprehensive performance, and is widely applied. PP is used as a semi-crystalline polymer material and has excellent performances such as higher rigidity, corrosion resistance, electrical insulation and the like. In general, polypropylene resins produced industrially have an isotactic structure content of about 95% and the balance of atactic or syndiotactic polypropylene. The common polypropylene has the defects of poor transparency, insufficient modulus and strength and the like due to the fact that the spherulite size is large and the interfacial adhesion between crystals is weak.
In order to meet the market demand for high-transparency and high-modulus polypropylene materials, nucleating agents are often added in the prior art to improve the performance of the polypropylene materials. The method has good effect and quick response, and is a preferred scheme for improving the transparency and the mechanical property of the polypropylene.
In the prior art, polypropylene nucleating agents are various, wherein sorbitol nucleating agents almost occupy 80% of the nucleating agent market due to the excellent transparent modification effect. However, the sorbitol nucleating agent can assemble to form a three-dimensional network structure in the polypropylene melt, so that the whole system is gelatinized, and the melt viscosity is suddenly increased; this has a negative impact on the production processes requiring high process flow (e.g. injection, drawing, blowing, etc.).
Therefore, the development of a new polypropylene nucleating agent and a high-transparency and high-modulus polypropylene material obviously have positive practical significance.
Disclosure of Invention
The invention aims to provide a high-transparency polypropylene composition.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a high-permeability polypropylene composition comprises the following components in parts by mass: 100 parts of isotactic polypropylene, 0.01-2 parts of modified nucleating agent, 0.01-1 part of antioxidant and 0.01-1 part of light stabilizer;
the modified nucleating agent consists of a sorbitol derivative without hydroxyl and a sorbitol nucleating agent;
the sorbitol nucleating agent is selected from one or more of 1,3:2, 4-dibenzylidene sorbitol (DBS), 1,3:2, 4-di (p-methylbenzylidene) sorbitol (MDBS) and 1,3:2, 4-di (3, 4-dimethylbenzylidene) sorbitol (DMDBS);
the hydroxyl-free sorbitol derivative is prepared by adopting the sorbitol nucleating agent, and comprises the following steps: (1) dissolving a sorbitol nucleating agent, sodium hydroxide and tetrabutylammonium bromide in an N, N-dimethylformamide solvent at the temperature of 60-80 ℃, and uniformly stirring; (2) and then adding epoxy chloropropane, and reacting at 60-70 ℃ for at least 8h, wherein the molar ratio of the epoxy chloropropane to the sorbitol nucleating agent in the raw materials is more than 2: 1; (3) filtering, washing, removing impurities and drying to obtain the hydroxyl-free sorbitol derivative.
In the technical scheme, the initiator is selected from one or more of tert-butyl hydroperoxide, xylene peroxide formyl, di-tert-butyl peroxide, di-tert-amyl peroxide and tert-butyl peroxybenzoate.
In the technical scheme, the antioxidant is one or a mixture of hindered phenol antioxidant, phosphite antioxidant or sulfur-containing antioxidant.
In the above technical scheme, the light stabilizer is selected from one or a mixture of at least two of salicylic acid esters, benzophenones, benzotriazoles, substituted acrylonitriles, triazines or hindered amines.
In the technical scheme, the mass ratio of the hydroxyl-free sorbitol derivative to the sorbitol nucleating agent is 2-4: 1.
Preferably, the mass ratio of the hydroxyl-free sorbitol derivative to the sorbitol nucleating agent is 3: 1.
The invention also discloses a preparation method of the high-transparency polypropylene composition, which comprises the following steps:
(1) preparation of sorbitol derivatives without hydroxyl groups:
1) dissolving a sorbitol nucleating agent, sodium hydroxide and tetrabutylammonium bromide in an N, N-dimethylformamide solvent at the temperature of 60-80 ℃, and uniformly stirring;
2) and then adding epoxy chloropropane, and reacting at 60-70 ℃ for at least 8h, wherein the molar ratio of the epoxy chloropropane to the sorbitol nucleating agent in the raw materials is more than 2: 1;
3) filtering, washing, removing impurities and drying to obtain the hydroxyl-free sorbitol derivative;
(2) the sorbitol derivative without hydroxyl group and the sorbitol nucleating agent are mixed and stirred evenly to obtain the modified nucleating agent,
(3) the method comprises the steps of uniformly mixing the components according to the proportion of claim 1, putting the mixture into a high-speed mixer at the rotating speed of 80-120 rpm, stirring for at least 30 minutes, and then extruding and granulating the premix at 160-230 ℃.
The invention also discloses an insulating heat-conducting transparent film prepared by adopting the polyolefin composition.
The invention also discloses an insulating heat-conducting transparent plate prepared by adopting the polyolefin composition.
The invention simultaneously claims a modified nucleating agent for the high-permeability polypropylene composition, which consists of a sorbitol derivative without hydroxyl and a sorbitol nucleating agent;
the sorbitol nucleating agent is selected from one or more of 1,3:2, 4-dibenzylidene sorbitol (DBS), 1,3:2, 4-di (p-methylbenzylidene) sorbitol (MDBS) and 1,3:2, 4-di (3, 4-dimethylbenzylidene) sorbitol (DMDBS);
the hydroxyl-free sorbitol derivative is prepared by adopting the sorbitol nucleating agent, and comprises the following steps: (1) dissolving a sorbitol nucleating agent, sodium hydroxide and tetrabutylammonium bromide in an N, N-dimethylformamide solvent at the temperature of 60-80 ℃, and uniformly stirring; (2) and then adding epoxy chloropropane, and reacting at 60-70 ℃ for at least 8h, wherein the molar ratio of the epoxy chloropropane to the sorbitol nucleating agent in the raw materials is more than 2: 1; (3) filtering, washing, removing impurities and drying to obtain the hydroxyl-free sorbitol derivative.
The working mechanism of the invention is as follows: the key reason that the sorbitol nucleating agent can cause the viscosity of the polypropylene melt to be increased suddenly is that molecules of the sorbitol nucleating agent are identified and assembled end to end in the polypropylene melt through intermolecular hydrogen bonds and pi-pi stacking action to form long-chain-shaped aggregates, and the long-chain-shaped aggregates are further wound to form a three-dimensional network structure, so that the whole system is gelatinized and forms a semi-solid-like state. In order to solve the problems, sorbitol nucleating agent molecules are used as raw materials, free hydroxyl at one end of the sorbitol nucleating agent molecules are reacted to synthesize a hydroxyl-free sorbitol derivative, the derivative reserves ether-oxygen bonds (oxygen atoms can be used as hydrogen bond acceptors) and benzene rings on the original nucleating agent molecules, the derivative can be matched with the hydroxyl and the benzene rings of other nucleating agent molecules more efficiently to form hydrogen bonds and pi-pi stacking effect for combination, and the free hydroxyl at one end of the derivative is reacted and can only be unidirectionally identified and combined with the nucleating agent molecules, so that the technical problem that long-chain-shaped aggregates are further wound to form a three-dimensional network structure is solved.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention develops a new polypropylene composition, and the adopted modified nucleating agents are all composed of sorbitol nucleating agents and modified substances thereof, so that the cost is extremely low, and the polypropylene composition is more suitable for industrial application;
2. the hydroxyl-free sorbitol derivative has the advantages that due to the retention of the original hydrogen bond and pi-pi action recognition site structure, the recognition efficiency of the non-covalent action between the derivative molecules and the nucleating agent molecules is higher, the combination is better, meanwhile, the hydroxyl-free sorbitol derivative molecules are organic small molecules and are more easily dispersed in polypropylene resin, so that the composite modified nucleating agent can realize the good improvement effect on the performances of polypropylene such as grain refinement, fog, modulus and the like while having no gelation effect;
3. the preparation method is simple and easy to implement, has low cost and is suitable for popularization and application.
Detailed Description
Example one
The high-permeability polypropylene composition comprises the following components in parts by weight:
dissolving a proper amount of DMDBS, sodium hydroxide and tetrabutylammonium bromide (TBAB) in a N, N-Dimethylformamide (DMF) solvent at 70 ℃, uniformly stirring, adding Epichlorohydrin (ECH), and reacting for 8 hours at 60 ℃, wherein the molar ratio of ECH to sorbitol nucleating agent in the raw materials is more than 2: 1; filtering, washing and removing impurities for multiple times, and drying to obtain the hydroxyl-free DMDBS derivative;
mixing hydroxyl-free DMDBS derivative and DMDBS according to the mass ratio of 2:1 to obtain a modified nucleating agent; 100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 1 part of modified nucleating agent, 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is added into a high-speed mixer, the rotating speed is 80-120 rpm, the mixture is stirred for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
Example two
The high-permeability polypropylene composition comprises the following components in parts by weight:
the preparation of hydroxyl-free DMDBS derivatives is the same as in example one;
mixing hydroxyl-free DMDBS derivative and DMDBS according to the mass ratio of 3:1 to obtain a modified nucleating agent; 100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 1 part of modified nucleating agent, 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is added into a high-speed mixer, the rotating speed is 80-120 rpm, the mixture is stirred for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
EXAMPLE III
The high-permeability polypropylene composition comprises the following components in parts by weight:
the preparation of hydroxyl-free DMDBS derivatives is the same as in example one;
mixing hydroxyl-free DMDBS derivative and DMDBS according to the mass ratio of 4:1 to obtain a modified nucleating agent; 100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 1 part of modified nucleating agent, 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is added into a high-speed mixer, the rotating speed is 80-120 rpm, the mixture is stirred for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
Example four
The high-permeability polypropylene composition comprises the following components in parts by weight:
dissolving a proper amount of DBS, sodium hydroxide and tetrabutylammonium bromide (TBAB) in a N, N-Dimethylformamide (DMF) solvent at 70 ℃, uniformly stirring, adding Epichlorohydrin (ECH), and reacting for 8 hours at 60 ℃, wherein the molar ratio of ECH to sorbitol nucleating agent in the raw materials is more than 2: 1; filtering, washing and removing impurities for multiple times, and drying to obtain the hydroxyl-free DBS derivative;
mixing a hydroxyl-free DBS derivative and DMDBS according to the mass ratio of 3:1 to obtain a modified nucleating agent; 100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 1 part of modified nucleating agent, 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is added into a high-speed mixer, the rotating speed is 80-120 rpm, the mixture is stirred for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
EXAMPLE five
The high-permeability polypropylene composition comprises the following components in parts by weight:
dissolving a proper amount of MDBS, sodium hydroxide and tetrabutylammonium bromide (TBAB) in a N, N-Dimethylformamide (DMF) solvent at 70 ℃, uniformly stirring, adding Epichlorohydrin (ECH), and reacting for 8 hours at 60 ℃, wherein the molar ratio of ECH to sorbitol nucleating agent in the raw materials is more than 2: 1; filtering, washing and removing impurities for many times, and drying to obtain the hydroxyl-free MDBS derivative;
mixing the hydroxyl-free MDBS derivative and the DMDBS according to the mass ratio of 3:1 to obtain a modified nucleating agent; 100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 1 part of modified nucleating agent, 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is added into a high-speed mixer, the rotating speed is 80-120 rpm, the mixture is stirred for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
Comparative example 1
The high-permeability polypropylene composition comprises the following components in parts by weight:
100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is put into a high-speed mixer, the rotating speed is 80-120 rpm, the mixture is stirred for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
Comparative example No. two
The high-permeability polypropylene composition comprises the following components in parts by weight:
100 parts of isotactic polypropylene K1008 (Yanshan petrochemical company), 1 part of DMDBS, 0.1 part of antioxidant 2, 6-di-tert-butyl-p-cresol (Beijing addition auxiliary research institute), 0.1 part of light stabilizer bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate (Beijing addition auxiliary research institute) are uniformly mixed, then the mixture is added into a high-speed mixer, the rotating speed is 80-120 rpm, stirring is carried out for 30 minutes, and the premix is extruded and granulated at 180-230 ℃.
The pellets obtained in examples and comparative examples were subjected to injection molding to obtain a 2mm polypropylene film. Some of the properties were tested and are detailed in the following table:
in the above table: s1 to S5 represent examples one to five, and D1 and D2 represent comparative examples one and two.
Compared with the pure polypropylene material, the transparency of the polypropylene composite material is greatly improved and the mechanical property of the material is correspondingly improved after the sorbitol nucleating agent is added into the raw material. However, it can be found from the rheological property that the addition of the nucleating agent causes the viscosity to change when the system is cooled to 163 ℃, because the nucleating agent is self-assembled in the melt, the sorbitol nucleating agent molecules are identified and assembled end to form fibrous aggregates, and further winding to form a three-dimensional network structure, so that the melt is gelatinized, the complex viscosity of the system is suddenly increased, and for the polypropylene system without the nucleating agent, the complex viscosity of the system is increased and crystallization begins when the system is cooled to 126 ℃ due to the absence of the gelation effect of the sorbitol nucleating agent.
Through the first to fifth examples, it can be found that the transition temperature of the rheological property is reduced after the nucleating agent is changed into the modified nucleating agent, and the transition temperature in the second example is similar to that of a pure polypropylene system, so that the modified nucleating agent can effectively avoid the influence of self-assembly gelation of the sorbitol nucleating agent, and meanwhile, the transparency and haze of the material are not reduced compared with those of the comparative example, the material still has good transparency, and the rigidity of the material is improved to a certain extent.
Particularly, when DMDBS is selected as the sorbitol nucleating agent in the modified nucleating agent, the mass ratio of the hydroxyl-free DMDBS derivative to DMDBS is 3:1, the overall performance of the material in all aspects is the best, and at the moment, the light transmittance is 98%, the haze is 7.1%, the bending strength is 65MPa, the tensile modulus is 1309MPa, and the elongation at break is 138%. The modified nucleating agent has no gelation effect, and simultaneously has good improvement effects on properties of polypropylene such as grain refinement, haze, modulus and the like, so that the high-transparency polypropylene material with good mechanical properties is prepared.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A high-permeability polypropylene composition is characterized in that: the adhesive comprises the following components in parts by mass: 100 parts of isotactic polypropylene, 0.01-2 parts of modified nucleating agent, 0.01-1 part of antioxidant and 0.01-1 part of light stabilizer;
the modified nucleating agent consists of a sorbitol derivative without hydroxyl and a sorbitol nucleating agent;
the sorbitol nucleating agent is selected from one or more of 1,3:2, 4-dibenzylidene sorbitol (DBS), 1,3:2, 4-di (p-methylbenzylidene) sorbitol (MDBS) and 1,3:2, 4-di (3, 4-dimethylbenzylidene) sorbitol (DMDBS);
the hydroxyl-free sorbitol derivative is prepared by adopting the sorbitol nucleating agent, and comprises the following steps: (1) dissolving a sorbitol nucleating agent, sodium hydroxide and tetrabutylammonium bromide in an N, N-dimethylformamide solvent at the temperature of 60-80 ℃, and uniformly stirring; (2) and then adding epoxy chloropropane, and reacting at 60-70 ℃ for at least 8h, wherein the molar ratio of the epoxy chloropropane to the sorbitol nucleating agent in the raw materials is more than 2: 1; (3) filtering, washing, removing impurities and drying to obtain the hydroxyl-free sorbitol derivative.
2. Polyolefin composition according to claim 1, characterized in that: the initiator is one or more selected from tert-butyl hydroperoxide, ditolyl peroxide, di-tert-butyl peroxide, di-tert-amyl peroxide and tert-butyl peroxybenzoate.
3. Polyolefin composition according to claim 1, characterized in that: the antioxidant is one or a mixture of hindered phenol antioxidant, phosphite antioxidant or sulfur-containing antioxidant.
4. Polyolefin composition according to claim 1, characterized in that: the light stabilizer is selected from one or a mixture of at least two of salicylic acid esters, benzophenones, benzotriazoles, substituted acrylonitrile, triazines or hindered amines.
5. Polyolefin composition according to claim 1, characterized in that: the mass ratio of the hydroxyl-free sorbitol derivative to the sorbitol nucleating agent is 2-4: 1.
6. Polyolefin composition according to claim 5, characterized in that: the mass ratio of the hydroxyl-free sorbitol derivative to the sorbitol nucleating agent is 3: 1.
7. The preparation method of the high-transparency polypropylene composition is characterized by comprising the following steps of:
(1) preparation of sorbitol derivatives without hydroxyl groups:
1) dissolving a sorbitol nucleating agent, sodium hydroxide and tetrabutylammonium bromide in an N, N-dimethylformamide solvent at the temperature of 60-80 ℃, and uniformly stirring;
2) and then adding epoxy chloropropane, and reacting at 60-70 ℃ for at least 8h, wherein the molar ratio of the epoxy chloropropane to the sorbitol nucleating agent in the raw materials is more than 2: 1;
3) filtering, washing, removing impurities and drying to obtain the hydroxyl-free sorbitol derivative;
(2) the sorbitol derivative without hydroxyl group and the sorbitol nucleating agent are mixed and stirred evenly to obtain the modified nucleating agent,
(3) the method comprises the steps of uniformly mixing the components according to the proportion of claim 1, putting the mixture into a high-speed mixer at the rotating speed of 80-120 rpm, stirring for at least 30 minutes, and then extruding and granulating the premix at 160-230 ℃.
8. An insulating, thermally conductive, transparent film prepared using the polyolefin composition of any of claims 1 to 6.
9. An insulating and heat-conducting transparent sheet prepared from the polyolefin composition of any one of claims 1 to 6.
10. A modified nucleating agent for a high-permeability polypropylene composition is characterized in that: consists of sorbitol derivatives without hydroxyl and sorbitol nucleating agent;
the sorbitol nucleating agent is selected from one or more of 1,3:2, 4-dibenzylidene sorbitol (DBS), 1,3:2, 4-di (p-methylbenzylidene) sorbitol (MDBS) and 1,3:2, 4-di (3, 4-dimethylbenzylidene) sorbitol (DMDBS);
the hydroxyl-free sorbitol derivative is prepared by adopting the sorbitol nucleating agent, and comprises the following steps: (1) dissolving a sorbitol nucleating agent, sodium hydroxide and tetrabutylammonium bromide in an N, N-dimethylformamide solvent at the temperature of 60-80 ℃, and uniformly stirring; (2) and then adding epoxy chloropropane, and reacting at 60-70 ℃ for at least 8h, wherein the molar ratio of the epoxy chloropropane to the sorbitol nucleating agent in the raw materials is more than 2: 1; (3) filtering, washing, removing impurities and drying to obtain the hydroxyl-free sorbitol derivative.
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| CN115194977A (en) * | 2022-07-18 | 2022-10-18 | 天津大学 | Method for improving high-temperature breakdown performance of long-chain branched polypropylene film for capacitor |
| CN115287017A (en) * | 2022-09-30 | 2022-11-04 | 苏州高泰电子技术股份有限公司 | Microcapsule, preparation method and application thereof, and polyurethane adhesive film |
| CN115141411B (en) * | 2022-06-13 | 2024-04-16 | 中化石化销售有限公司 | Compound transparent nucleating agent, polypropylene material, and preparation method and application thereof |
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| CN115194977A (en) * | 2022-07-18 | 2022-10-18 | 天津大学 | Method for improving high-temperature breakdown performance of long-chain branched polypropylene film for capacitor |
| CN115194977B (en) * | 2022-07-18 | 2023-07-21 | 天津大学 | Method for improving high-temperature breakdown performance of long-chain branched polypropylene film for capacitor |
| CN115287017A (en) * | 2022-09-30 | 2022-11-04 | 苏州高泰电子技术股份有限公司 | Microcapsule, preparation method and application thereof, and polyurethane adhesive film |
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