CN111087680B - Low-VOC low-odor master batch for polypropylene, preparation method and application thereof, and method for reducing VOC content in polypropylene - Google Patents
Low-VOC low-odor master batch for polypropylene, preparation method and application thereof, and method for reducing VOC content in polypropylene Download PDFInfo
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Abstract
The invention relates to the field of plastics, and particularly relates to a low-VOC low-odor master batch for polypropylene, a preparation method and application thereof, and a method for reducing VOC content in polypropylene. The low-VOC low-odor master batch for polypropylene comprises the following blended components: polypropylene resin, modified carbon nano tubes, octa-isobutyl silsesquioxane and an antioxidant; the modified carbon nano tube is a multi-wall carbon nano tube coated by divinylbenzene. The low VOC low-odor master batch for polypropylene can obviously reduce the VOC content and odor of a polypropylene material, so that the Total Volatile Organic Compounds (TVOC) of the polypropylene material is lower than 50 mu g.C/g, and the odor is below 3.5 grade.
Description
Technical Field
The invention relates to the field of plastics, in particular to a low-VOC low-odor master batch for polypropylene, a preparation method of the low-VOC low-odor master batch for polypropylene, application of the low-VOC low-odor master batch for polypropylene and a method for reducing VOC content in polypropylene.
Background
Polypropylene (PP) has been widely used in various fields of people's life because of its advantages of excellent comprehensive properties, wide sources, high quality and low cost. However, the existing polypropylene materials and products have the problems of releasing Volatile Organic Compounds (VOC) and odor to different degrees, polluting the environment and harming the health of people, so that the application of the polypropylene materials in the fields of high-grade automotive upholsteries with higher environmental protection requirements, medical and food packaging materials and the like is limited to a great extent. Therefore, the research and development of the environment-friendly low-VOC low-odor polypropylene resin and the material can expand the application field of PP and meet the requirements of green environment-friendly materials.
At present, most of the reports on the research on low-VOC and low-odor polypropylene materials adopt chemical reaction, physical adsorption and melt devolatilization technologies to improve the VOC emission problem in the original polypropylene materials. For example, CN101570612A reduces VOC content by adding an inorganic photocatalyst to decompose organic small molecules, but the composition is complex and the effect is limited. CN101255252A lowered the VOC of the material by adding organic repellents (such as isopropyl alcohol/water), but this approach has compatibility and durability issues. EP1988122A1 adopts metallocene polypropylene resin as matrix resin to prepare low VOC automotive interior materials; EP 2154190a1 uses specific light stabilizers (such as light stabilizer 119) to prepare polypropylene composites with low VOC content; CN101691435A produced a low VOC polypropylene composite by producing a co-polypropylene using a specific hydrogen blending process. The invention only aims at improving a certain factor generating VOC and cannot solve the problem of VOC generated by various factors at the same time.
Physical adsorption can adsorb all small molecules produced by PP, and the addition of physical adsorbents is a common method. For example, CN1727389A and CN1727390A disclose the use of fine-pore silica gel and molecular sieves as adsorbents to reduce the odor of materials and the volatilization problem of organic compounds, and CN102276921A discloses the use of vegetable fibers as adsorbents to reduce the odor of polypropylene materials. Although the method adopting the adsorbent can play a certain role in reducing the polypropylene VOC, the problem of adsorption balance still exists, and the balance moves to the desorption direction at a higher temperature, so that the hidden danger of later-period re-release of the polypropylene VOC exists. In addition, the problems of the adsorption efficiency of the adsorbent, the compatibility with polypropylene, the dispersion of the adsorbent in the polypropylene matrix and the like still exist. Therefore, there is still a need to develop a new polypropylene resin composition having a low VOC content and a low odor.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a low-VOC low-odor master batch for polypropylene, a preparation method of the low-VOC low-odor master batch for polypropylene, application of the low-VOC low-odor master batch for polypropylene and a method for reducing the VOC content in polypropylene.
The invention provides a low-VOC low-odor master batch for polypropylene, which comprises the following blended components in part by weight: polypropylene resin, modified carbon nano tubes, octa-isobutyl silsesquioxane and an antioxidant; 45-85 parts of polypropylene resin, 8-25 parts of modified carbon nano tube, 5-35 parts of octaisobutylsilsesquioxane, and 100 parts of the total amount of the polypropylene resin, the modified carbon nano tube and the octaisobutylsilsesquioxane; the modified carbon nano tube is a multi-wall carbon nano tube coated by divinylbenzene.
The second aspect of the present invention provides a preparation method of the low VOC low odor master batch for polypropylene, including: and melting, blending and extruding the polypropylene resin, the modified carbon nano tube, the octa-isobutyl silsesquioxane and the antioxidant for granulation to prepare the low-VOC low-odor master batch for polypropylene.
The third aspect of the present invention provides the use of the low VOC low odor master batch for polypropylene.
In a fourth aspect, the present invention provides a method for reducing the VOC content of polypropylene, comprising: melting and blending components including polypropylene, an acid absorbent, an antioxidant and the low-VOC low-odor master batch for polypropylene to obtain a low-VOC polypropylene composition; the amount of the low-VOC low-odor master batch for polypropylene is 0.5-10 parts by weight, preferably 1-5 parts by weight, relative to 100 parts by weight of the polypropylene; and, the octaisobutylsilsesquioxane is present in an amount less than 1.8 wt% based on the total amount of the low VOC polypropylene composition.
Compared with the prior art, the invention has the following beneficial effects:
1. the modified carbon nano tube used in the invention has higher thermal stability, and no additional VOC is generated in the processing, using and storing processes; the divinyl benzene coated by the modified carbon nano tube has non-polarity, has better compatibility with polypropylene and can be uniformly dispersed in a polypropylene matrix; meanwhile, the structure with large specific surface area can also effectively adsorb small-molecule hydrocarbon VOC, and the hollow carbon tube can effectively adsorb and block the release of macromolecular hydrocarbon VOC.
2. The tubular structure of the modified carbon nano tube and the cage-shaped structure of the octa-isobutyl silsesquioxane have good synergistic adsorption and barrier effects, and can further inhibit the release of VOC in polypropylene.
3. The modified carbon nanotube, the octa-isobutyl silsesquioxane and the antioxidant are compounded, so that the dispersion effect of the antioxidant in the polypropylene resin can be effectively improved, the efficiency of the antioxidant is improved, and the total amount of VOC in the master batch for polypropylene is remarkably reduced.
4. The low-VOC low-odor master batch for polypropylene is subjected to melt blending through the polypropylene matrix, the modified carbon nano tube and the octa-isobutyl silsesquioxane to master batch, so that the dispersion effect of the modified carbon nano tube and the octa-isobutyl silsesquioxane is improved, the VOC inhibiting efficiency is improved, the total volatile organic matter content in the master batch is obviously reduced, and the problem of residual volatile organic matter in the master batch is solved.
5. The low-VOC low-odor master batch prepared by the invention can effectively inhibit the generation of VOC and odor in the polypropylene material, and when the low-VOC low-odor master batch is applied to the polypropylene material, the Total Volatile Organic Compound (TVOC) content in the polypropylene material is lower than 50 mu g.C/g, and the odor reaches below 3.5 grade, thereby well solving the defects of the prior art. And the operation process is simple and reliable, the investment cost is low, and the method can be widely applied to the fields of high-grade automotive upholsteries with high environmental protection requirements and the like.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
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.
According to a first aspect of the present invention, there is provided a low VOC low odor master batch for polypropylene comprising blended components: polypropylene resin, modified carbon nano tubes, octa-isobutyl silsesquioxane and an antioxidant; 45-85 parts of polypropylene resin, 8-25 parts of modified carbon nano tube, 5-35 parts of octaisobutylsilsesquioxane, and 100 parts of the total amount of the polypropylene resin, the modified carbon nano tube and the octaisobutylsilsesquioxane; the modified carbon nano tube is a multi-wall carbon nano tube coated by divinylbenzene.
According to the present invention, it is preferable that the polypropylene resin is 50 to 80 parts by weight, the modified carbon nanotube is 10 to 20 parts by weight, the octaisobutylsilsesquioxane is 10 to 30 parts by weight, and the total amount of the polypropylene resin, the modified carbon nanotube and the octaisobutylsilsesquioxane is 100 parts by weight.
The divinylbenzene-coated multi-walled carbon nanotubes can be obtained commercially or by self, for example, from Beijing university of chemical industry, under the product number DVB-CNTs-1. The preparation method can adopt a method comprising the following steps:
a) mixing an original carbon nano tube and N, N-dimethylformamide to prepare a suspension with the concentration of 1-5 mg/mL, and performing ultrasonic treatment for more than 45 min;
b) adding azodiisobutyronitrile with the mass of 0.25 time that of the carbon nano tube in a) into the suspension, continuing to perform ultrasonic treatment for 10min to fully activate the carbon nano tube, and dissolving to obtain a uniform system;
c) introducing nitrogen into the system, heating to 80 ℃, gradually dropwise adding 1-10 times of divinylbenzene monomer based on the mass of the carbon nano tubes, and reacting for 12 hours under the condition;
d) after the reaction is stopped, the product is obtained by suction filtration, and the final product is obtained by washing with methanol and deionized water in sequence.
According to the present invention, it is preferable that the modified carbon nanotube used has a diameter of 20 to 60nm, a length of 5 to 50 μm, and a coating layer thickness of 10 to 100 nm.
In the low-VOC low-odor master batch for polypropylene, the polypropylene resin includes various types of polypropylene resins disclosed in the prior art, including homo-polypropylene resin and/or co-polypropylene resin; it is further preferred that the polypropylene resin has a melt index of 3 to 30g/10min, more preferably 3 to 10g/10min at 230 ℃ under a load of 2.16 kg.
In the invention, the octaisobutylsilsesquioxane (octaisobutylPOSS) is of a polycrystalline cage-type structure, has two melting points of 56 ℃ and 269 ℃ respectively, and has a structure shown as a formula I.
The inventor of the invention finds that the cage-type octa-isobutyl silsesquioxane with two crystal forms can effectively adsorb VOC in polypropylene, and meanwhile, the octa-isobutyl POSS with a low melting point crystal form is transferred to the surface of the polypropylene to form an isolation layer, so that VOC release of residual hydrocarbon is further slowed down. In addition, the good assistant dispersing effect of the octa-isobutyl silsesquioxane antioxidant in the polypropylene is fully exerted, the VOC generated by degradation can be greatly inhibited, and the emission of the VOC in the polypropylene is further remarkably reduced.
Said octaisobutylsilsesquioxanes are commercially available and, due to the limitations of the existing preparation methods, tend to contain other impurities, preferably chosen from N2Octaisobutylsilsesquioxane with an initial thermal degradation temperature above 240 ℃ under atmospheric conditions, such as octaisobutylsilsesquioxane MS0825 by hybrid plastics, usa.
In the low-VOC low-odor master batch for polypropylene, the dosage of the antioxidant is conventional choice in preparation of polypropylene master batches. The antioxidant may be 0.01 to 1 part by weight, preferably 0.1 to 0.5 part by weight, based on 100 parts by weight of the total amount of the polypropylene resin, the modified carbon nanotube and the octa-isobutyl silsesquioxane.
In particular, the antioxidant may be selected from hindered phenolic antioxidants and/or phosphate antioxidants. The hindered phenol antioxidant is preferably at least one selected from the group consisting of pentaerythrityl tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010), N-octadecyl β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate (antioxidant 1076), N' -bis- (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) hexanediamine (antioxidant 1098), and 1,3, 5-tris (3, 5-di-t-butyl-4-hydroxybenzyl) isocyanuric acid (antioxidant 3114). The phosphate antioxidant is preferably selected from tris (2, 4-di-tert-butylphenol) phosphite (antioxidant 168) and/or bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite (antioxidant 626).
Preferably, the antioxidant is a mixture of a hindered phenol antioxidant and a phosphate antioxidant, and the weight ratio of the hindered phenol antioxidant to the phosphate antioxidant is 1: 1-8, preferably 1: 1-6, and more preferably 1: 1-4.
According to a second aspect of the present invention, the present invention provides a preparation method of the polypropylene low VOC low odor master batch, which comprises: and melting, blending and extruding the polypropylene resin, the modified carbon nano tube, the octa-isobutyl silsesquioxane and the antioxidant for granulation to prepare the low-VOC low-odor master batch for polypropylene.
According to one embodiment, the method for preparing the low-VOC low-odor master batch for polypropylene comprises the following steps:
(1) uniformly mixing components including polypropylene resin, modified carbon nano tubes, octa-isobutyl silsesquioxane and an antioxidant to obtain a mixture;
(2) and carrying out melt blending and extrusion granulation on the mixture to obtain the low-VOC low-odor master batch for polypropylene.
According to the present invention, in the step (1), the polypropylene resin is preferably a dried polypropylene resin.
In the preparation method of the invention, the mixing equipment of the materials can adopt various mixing equipment used in the prior art, such as a stirrer, a kneader and the like.
In the preparation method, the melting and blending equipment of the materials can be selected from general blending equipment in the rubber and plastic processing industry, and can be a double-screw extruder, a BUSS mixing unit and the like.
In the processing process of the low-VOC low-odor master batch for polypropylene, the material melt blending temperature can be the blending temperature commonly used in polypropylene processing, and is selected within the range of ensuring that matrix resin is completely melted and cannot be decomposed, generally 190-230 ℃, and the preferred processing temperature is 200-220 ℃; the rotation speed of the screw is generally 300 to 450 rpm.
According to a third aspect of the present invention, the present invention provides the use of the low VOC low odor masterbatch for polypropylene.
Specifically, according to a fourth aspect of the present invention, there is provided a method for reducing VOC in polypropylene, the method comprising: carrying out melt blending on components including polypropylene, an acid absorbent, an antioxidant and the low-VOC low-odor master batch for polypropylene to obtain a low-VOC polypropylene composition; the low-VOC low-odor master batch for polypropylene is used in an amount of 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the polypropylene, and the content of the octaisobutylsilsesquioxane is less than 1.8% by weight based on the total amount of the low-VOC polypropylene composition.
According to the present invention, the content of octaisobutylsilsesquioxane is controlled to be less than 1.8 wt% based on the total amount of the low VOC polypropylene composition, in which case the TVOC of the low VOC polypropylene composition is less than 50 μ g.c/g and the odor reaches 3.5 grade or less.
More preferably, the content of octaisobutylsilsesquioxane is less than 1 wt% and greater than 0.05 wt%, further preferably, the content of octaisobutylsilsesquioxane is less than 0.6 wt% and greater than 0.1 wt%, based on the total amount of the low VOC polypropylene composition.
For the sake of convenience of distinction, the matrix in the low-VOC low-odor master batch for polypropylene is referred to as polypropylene resin, and the matrix resin (i.e., the polypropylene whose VOC content is to be reduced) for preparing the low-VOC low-odor polypropylene composition is referred to as polypropylene, and the polypropylene may be any homo-polypropylene or co-polypropylene which needs to be reduced in VOC, and may be the same as or different from the polypropylene resin in the low-VOC low-odor master batch for polypropylene.
In the low VOC polypropylene composition, the acid scavenger is capable of reacting with dilute acid catalyst residues present in the polypropylene to reduce or inhibit VOC generation due to dilute acid catalyzed degradation of the polypropylene. The acid acceptor has the main property that the acid acceptor has alkalinity and can react with acid catalyst residues to play a role in neutralization, and the acid acceptor required by the invention can be well dispersed in polypropylene at the same time. The acid scavenger may be selected from at least one of metal oxide, lactate, benzoate, silicate and Na, Ca or Zn-containing stearate, preferably Na, Ca or Zn-containing stearate. Wherein the metal oxide is preferably selected from calcium oxide and/or zinc oxide; the silicate may be selected from natural or synthetic hydrotalcite; the Na, Ca or Zn-containing stearate is preferably at least one selected from the group consisting of calcium stearate, zinc stearate and sodium stearate.
In the low VOC polypropylene composition, the acid scavenger may be present in an amount of 0.05 to 1 part by weight, preferably 0.2 to 0.8 part by weight, based on 100 parts by weight of the polypropylene.
In the low-VOC polypropylene composition, the antioxidant may be selected with reference to the antioxidant in the low-VOC low-odor masterbatch for polypropylene, and details thereof are not repeated herein. In the low VOC polypropylene composition, the antioxidant is preferably 0.05 to 1 part by weight, more preferably 0.2 to 0.5 part by weight, based on 100 parts by weight of the polypropylene.
In order to remove VOC better, in the application of the low-VOC low-odor master batch for polypropylene, the vacuum degree of a vacuum system of equipment during melt blending is preferably kept above-0.05 MPa, and more preferably above-0.08 MPa.
In addition, during the preparation of the low-VOC low-odor master batch for polypropylene and the low-VOC polypropylene composition, some processing aids commonly used in the processing of polypropylene resins, such as: lubricants, antistatic agents, dispersants, pigments, processing heat stabilizers, light stabilizers and the like, wherein the use amounts are conventional or adjusted according to the requirements of actual conditions; however, it is preferable that the low-VOC low-odor master batch for polypropylene does not contain the aforementioned processing aid. In the application of the present invention, the mixing device and the melting device are as described above, and are not described herein again.
The present invention is described in more detail by the following examples.
Preparation examples A to F
Preparation examples A to F are illustrative of the low VOC, low odor master batches A to F for polypropylene of the present invention and the method of preparation thereof.
Mixing the modified carbon nanotube (divinylbenzene-coated multi-walled carbon nanotube, DVB-CNTs-1, Beijing chemical university, diameter of 40nm, length of 30 μm, coating thickness of 20nm) and octaisobutylsilsesquioxane (MS0825, hybrid plastic company, USA) polypropylene (K1008, homopolypropylene, Petroselinum beijing Yanshan division, China petrochemical, 10g/10 min); placing the antioxidant (antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 1098 and antioxidant 3114, all from Pasteur Germany) into a high-speed stirrer, stirring at 300 rpm for 3 minutes to fully and uniformly mix the components; and then, extruding and granulating the mixed material by a BUSS mixing unit (MKD-30, Switzerland BUSS company) at the temperature of 190-230 ℃ to obtain the low-VOC low-odor master batch A-F for polypropylene. The specific formula is shown in table 1, wherein the contents of all components are calculated by weight parts.
Examples 1 to 10
Examples 1-10 are presented to illustrate the preparation of low VOC, low odor polypropylene compositions.
The polypropylene (YJP560H, China petrochemical Yangzi petrochemical company, Ltd.), the low VOC and low odor master batch for polypropylene prepared by the preparation example, the antioxidant, the acid absorbent and other processing aids are put into a high-speed stirrer and stirred for 3 minutes at the rotating speed of 300 revolutions per minute, so that the components are fully and uniformly mixed. And then, the mixed material is extruded and granulated by a BUSS mixing unit at the temperature of between 190 and 230 ℃ under the condition of keeping the vacuum degree of-0.08 MPa to obtain the polypropylene material with low VOC content and low odor. The specific formula is shown in table 2, wherein the contents of all components are calculated by weight parts.
The extruded pellets were dried in a constant temperature oven at 80 ℃ for 2h and then subjected to the tests, wherein TVOC was tested according to standard VDA277 of the german automobile industry association and odor was tested according to standard VDA270 of the german automobile industry association. Specific performance results are shown in table 2.
Comparative examples 1 to 5
The raw materials of polypropylene, modified carbon nanotubes, octa-isobutyl silsesquioxane, antioxidant, acid-absorbing agent, adsorbent (RS378, german daxu polymer materials ltd.) and the like, which were from the same sources as in examples 1 to 10, were weighed in the specific proportions shown in table 2, and each was put into a high-speed mixer and stirred at a rotation speed of 300 rpm for 3 minutes to sufficiently and uniformly mix the components. And then extruding and granulating the mixed material by a BUSS mixing unit (same as the example 1) within the temperature range of 190-230 ℃ to obtain the polypropylene material. The specific formula is shown in table 2, wherein the contents of all components are calculated by weight parts.
The extruded pellets were dried in a constant temperature oven at 80 ℃ for 2h and then subjected to the tests, wherein TVOC was tested according to standard VDA277 of the german automobile industry association and odor was tested according to standard VDA270 of the german automobile industry association. Specific performance results are shown in table 2.
TABLE 1 composition ratio of master batches
As can be seen from the above table, the low VOC low odor master batch for polypropylene of the invention can significantly reduce the VOC content and odor of polypropylene materials, so that the Total Volatile Organic Compounds (TVOC) of the polypropylene materials is less than 50 [ mu ] g C/g, and the odor is below grade 3.5.
Octaisobutylsilsesquioxane in preferred amounts ranges can further reduce the VOC content of polypropylene materials.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (14)
1. The low-VOC low-odor master batch for polypropylene is characterized by comprising the following blended components: polypropylene resin, modified carbon nano tubes, octa-isobutyl silsesquioxane and an antioxidant; 45-85 parts of polypropylene resin, 8-25 parts of modified carbon nano tube, 5-35 parts of octaisobutylsilsesquioxane, and 100 parts of the total amount of the polypropylene resin, the modified carbon nano tube and the octaisobutylsilsesquioxane; the modified carbon nano tube is a multi-wall carbon nano tube coated by divinylbenzene.
2. The low-VOC low-odor master batch for polypropylene according to claim 1, wherein the polypropylene resin is 50 to 80 parts by weight, the modified carbon nanotubes are 10 to 20 parts by weight, the octaisobutylsilsesquioxane is 10 to 30 parts by weight, and the total amount of the polypropylene resin, the modified carbon nanotubes and the octaisobutylsilsesquioxane is 100 parts by weight.
3. The low-VOC low-odor master batch for polypropylene according to claim 1, wherein the diameter of the modified carbon nanotube is 20-60nm, the length of the modified carbon nanotube is 5-50 μm, and the thickness of the coating layer is 10-100 nm.
4. The low-VOC low-odor master batch for polypropylene according to claim 1, wherein the polypropylene resin has a melt index of 3 to 30g/10min at 230 ℃ under a load of 2.16 kg.
5. The low-VOC low-odor master batch for polypropylene according to claim 4, wherein the melt index of the polypropylene resin at 230 ℃ under a load of 2.16kg is 3-10g/10 min.
6. The low VOC, low odor master batch for polypropylene according to claim 1, wherein said antioxidant is selected from hindered phenolic antioxidants and/or phosphate antioxidants;
the hindered phenol antioxidant is selected from at least one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], N-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine and 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid;
the phosphate antioxidant is selected from tris (2, 4-di-tert-butylphenol) phosphite and/or bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite.
7. The low-VOC low-odor master batch for polypropylene according to claim 6, wherein the antioxidant is a mixture of a hindered phenol antioxidant and a phosphate antioxidant, and the weight ratio of the hindered phenol antioxidant to the phosphate antioxidant is 1: 1-8.
8. The low-VOC low-odor master batch for polypropylene according to any one of claims 1 to 7, wherein the antioxidant is 0.01 to 1 part by weight based on 100 parts by weight of the total amount of the polypropylene resin, the modified carbon nanotubes and the octaisobutylsilsesquioxane.
9. The low-VOC low-odor master batch for polypropylene according to claim 8, wherein the antioxidant is 0.1 to 0.5 part by weight.
10. The method for preparing a low VOC, low odor concentrate for polypropylene of any one of claims 1-9, comprising: and melting, blending and extruding the polypropylene resin, the modified carbon nano tube, the octa-isobutyl silsesquioxane and the antioxidant for granulation to prepare the low-VOC low-odor master batch for polypropylene.
11. The production method according to claim 10, wherein the production method comprises the steps of:
(1) uniformly mixing components including polypropylene resin, modified carbon nano tubes, octa-isobutyl silsesquioxane and an antioxidant to obtain a mixture;
(2) and carrying out melt blending and extrusion granulation on the mixture to obtain the low-VOC low-odor master batch for polypropylene.
12. Use of a low VOC low odor concentrate for polypropylene according to any one of claims 1-9.
13. A method of reducing the VOC content of polypropylene comprising: melt blending components comprising polypropylene, an acid absorbent, an antioxidant and the low VOC low odor master batch for polypropylene of any one of claims 1-9 to obtain a low VOC polypropylene composition; the amount of the low-VOC low-odor master batch for polypropylene is 0.5-10 parts by weight relative to 100 parts by weight of the polypropylene; and, the octaisobutylsilsesquioxane is present in an amount less than 1.8 wt% based on the total amount of the low VOC polypropylene composition.
14. The method for reducing VOC content in polypropylene according to claim 13, wherein the low-VOC low-odor master batch for polypropylene is used in an amount of 1-5 parts by weight.
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| CN105440668A (en) * | 2015-12-16 | 2016-03-30 | 安徽都邦电器有限公司 | Carbon nanotube modified nylon tubular product |
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| US20140005304A1 (en) * | 2012-07-02 | 2014-01-02 | Baker Hughes Incorporated | Nanocomposite and method of making the same |
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| CN107987387A (en) * | 2017-12-15 | 2018-05-04 | 会通新材料股份有限公司 | A kind of high modulus polypropylene/cage-type silsesquioxane micro foaming composite material and preparation method thereof |
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