CN112608555B - Foaming agent master batch and preparation method thereof - Google Patents
Foaming agent master batch and preparation method thereof Download PDFInfo
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- CN112608555B CN112608555B CN202011479543.8A CN202011479543A CN112608555B CN 112608555 B CN112608555 B CN 112608555B CN 202011479543 A CN202011479543 A CN 202011479543A CN 112608555 B CN112608555 B CN 112608555B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
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Abstract
The invention provides a foaming agent master batch, a preparation method and an application thereof, wherein the foaming agent master batch comprises the following components in parts by weight: 40-75 parts of polypropylene resin, 25-60 parts of foaming agent and 0.2-2 parts of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by using a silane coupling agent. The foaming agent master batch is prepared by selecting porous polypropylene powder, and then mixing the foaming agent and the polypropylene powder at a high speed to fill the foaming agent into the pores of the polypropylene powder, wherein the obtained foaming agent master batch is a powdery foaming agent master batch taking PP powder as a carrier. Through a foaming forming experiment, when the foaming agent master batch disclosed by the invention is used, the uniformity of foam holes of a foaming plate can be obviously improved, the size of the foam holes is reduced, and the using amount of a foaming agent is reduced under the condition of the same foaming effect.
Description
Technical Field
The invention relates to the field of polymer composite materials, in particular to foaming agent master batches and a preparation method thereof.
Background
Polyolefins have the advantages of low density, easy processing, excellent mechanical properties, chemical resistance, easy recovery and the like, and have been widely used. The problems that foamed PS plastic is difficult to recycle, harmful isocyanate residues in PU foaming materials and the like are attracted by worldwide attention, the environmental protection organization of the United nations has decided to stop producing and using foamed PS in 2005 worldwide, and foamed PE and foamed PP have acquired huge development space under the background. Polyethylene, especially low density polyethylene, readily forms crosslinks under the action of peroxides and is particularly suitable for foaming. However, the macromolecular chains of the PP material are relatively regular, the branched chains are few and short, and crosslinking is difficult to form by using peroxide, so that the PP foaming has great technical difficulty.
Besides the difficulty of forming crosslinking points in polypropylene itself, the dispersion of the chemical blowing agent in polypropylene is also a key factor influencing the foaming effect. The mixing of chemical blowing agents with polypropylene is generally carried out in two ways: firstly, powder shape; secondly, master batch form. Firstly, when powder is in a powder form, a foaming agent is well dispersed in a PP melt, but in the blanking process of processing, due to the fact that powder is high in specific gravity, the powder is easy to be classified with PP particles, so that uneven foaming is caused, and in addition, the problems that gas escapes too fast and bubbles on the surface are too many are easy to occur in the foaming process; when the master batch is in a master batch form, the master batch is uniformly mixed with polypropylene particles, but the foaming agent master batch needs to be redispersed by a screw of an injection machine, when the shearing dispersion capacity of the screw of the injection machine is not good, the foamed cell size is not uniform, and more foaming agent master batches need to be added. In order to overcome the defects of the two foaming agent forms, domestic existing manufacturers use porous mineral powder as a carrier of the foaming agent, but also face the problem of powder classification in the processing process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a foaming agent master batch and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: the foaming agent master batch comprises the following components in parts by weight: 40-75 parts of polypropylene resin powder, 25-60 parts of foaming agent and 0.2-2 parts of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by silane coupling agent, the average particle size of the polypropylene resin powder is 0.5-1.5 mm, and the bulk density of the oligomeric propylene resin powder is 0.32-0.42 g/cm3。
The inventors have found, through research, that the foaming agent master batch is a powdery foaming agent master batch using PP powder as a carrier, which is obtained by selecting porous polypropylene powder, mixing a foaming agent with the polypropylene powder at a high speed to fill the pores of the polypropylene powder with the foaming agent. Through a foaming forming experiment, the uniformity of foam holes can be obviously improved when the foaming agent master batch is used, the size of the foam holes is reduced, and the using amount of the foaming agent is reduced when the same foaming effect is obtained.
Preferably, the weight ratio of the polypropylene resin powder to the foaming agent is (50-75): (25-50).
The inventor finds that the weight ratio of the polypropylene resin to the foaming agent is (50-75): (25-50), the foaming agent master batch can obviously improve the uniformity of foam pores and reduce the size of the foam pores.
Preferably, the weight ratio of the polypropylene resin powder to the foaming agent is (50-65): (35-50).
The inventor finds that the weight ratio of the polypropylene resin to the foaming agent is (50-65): (35-50), the foaming agent master batch can obviously improve the uniformity of foam pores and reduce the size of the foam pores.
Preferably, the weight ratio of the polypropylene resin powder to the foaming agent is (50-60): (40-50).
The inventor finds that the weight ratio of the polypropylene resin to the foaming agent is (50-60): (40-50), the foaming agent master batch can obviously improve the uniformity of foam holes and reduce the size of the foam holes.
Preferably, the auxiliary agent comprises at least one of an antioxidant, a light stabilizer and a lubricant.
Preferably, the antioxidant is at least one of hindered phenol antioxidant and phosphite antioxidant.
Preferably, the light stabilizer is a hindered amine light stabilizer.
Preferably, the lubricant is at least one of glyceryl monostearate and a metal stearate compound.
Preferably, the method comprises the steps of: mixing the polypropylene resin powder, the foaming agent and the auxiliary agent to obtain foaming agent master batches.
The invention also provides application of any foaming agent master batch in plastic foaming plates.
The invention also provides a plastic foaming plate, wherein any foaming agent master batch accounts for 2-5% of the weight of the foaming agent plate.
The invention has the beneficial effects that: the invention provides a foaming agent master batch, which is a powdery foaming agent master batch taking PP powder as a carrier, wherein porous polypropylene powder is selected, and then a foaming agent is mixed with the polypropylene powder at a high speed to fill the foaming agent into pores of the polypropylene powder. Through a foaming forming experiment, when the foaming agent master batch disclosed by the invention is used, the uniformity of foam holes of a foaming plate can be obviously improved, the size of the foam holes is reduced, and the using amount of a foaming agent is reduced under the condition of the same foaming effect.
Drawings
Fig. 1 is an enlarged view of a foaming agent master batch according to an embodiment of the present invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The foaming agent master batch provided by the embodiment of the invention comprises the following components in parts by weight: 60 parts by weight of polypropylene resin powder, source: the stone is widely petrochemical; 40 parts by weight of foaming agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by using silane coupling agent, 0.8 part by weight of auxiliary agent, the auxiliary agent comprises antioxidant, light stabilizer and lubricant, the antioxidant comprises 0.2 part by weight of antioxidant 1010 and 0.2 part by weight of antioxidant 168, the light stabilizer is 0.2 part by weight of light stabilizer 3808PP5, the lubricant is 0.2 part by weight of calcium stearate, the average particle size of the polypropylene resin powder is 0.9mm, the particle size distribution 90% by weight is respectively 0.5-1.5 mm, and the bulk density of the oligomeric propylene resin powder is 0.38g/cm3。
The preparation method of the foaming agent masterbatch comprises the following steps: the polypropylene resin, the foaming agent and the auxiliary agent are mixed in a high-speed mixer according to the weight ratio for 60 seconds to obtain foaming agent powder master batches, namely the foaming agent master batches of the embodiment 1.
Example 2
The foaming agent master batch provided by the embodiment of the invention comprises the following components in parts by weight: 50 by weightThe polypropylene resin powder comprises, by weight, polypropylene resin powder, 50 parts of foaming agent and 0.8 part of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by silane coupling agent, the auxiliary agent comprises antioxidant, light stabilizer and lubricant, the antioxidant comprises 0.2 part of antioxidant 1010 and 0.2 part of antioxidant 168, the light stabilizer is 0.2 part of light stabilizer 3808PP5, the lubricant is 0.2 part of calcium stearate, the average particle size of the polypropylene resin powder is 0.9mm, the weight percentage of the particle size distribution is respectively 0.5-1.5 mm, and the bulk density of the oligomeric propylene resin powder is 0.38g/cm3。
Example 3
The foaming agent master batch provided by the embodiment of the invention comprises the following components in parts by weight: 55 parts by weight of polypropylene resin powder, 45 parts by weight of foaming agent and 0.8 part by weight of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by silane coupling agent, the auxiliary agent comprises antioxidant, light stabilizer and lubricant, the antioxidant comprises 0.2 part by weight of antioxidant 1010 and 0.2 part by weight of antioxidant 168, the light stabilizer is 0.2 part by weight of light stabilizer 3808PP5, the lubricant is 0.2 part by weight of calcium stearate, the average particle size of the polypropylene resin powder is 0.9mm, the weight percentage of 90% of particle size distribution is respectively 0.5-1.5 mm, and the bulk density of the oligomeric propylene resin powder is 0.38g/cm3。
Example 4
The foaming agent master batch provided by the embodiment of the invention comprises the following components in parts by weight: 65 parts by weight of polypropylene resin powder, 35 parts by weight of foaming agent and 0.8 part by weight of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by silane coupling agent, the auxiliary agent comprises antioxidant, light stabilizer and lubricant, the antioxidant comprises 0.2 part by weight of antioxidant 1010 and 0.2 part by weight of antioxidant 168, the light stabilizer is 0.2 part by weight of light stabilizer 3808PP5, the lubricant is 0.2 part by weight of calcium stearate, the average particle size of the polypropylene resin powder is 0.9mm, the weight percentage of the particle size distribution is respectively 0.5-1.5 mm, and the bulk density of the oligomeric propylene resin powder is 0.38g/cm3。
Example 5
As an embodiment of the inventionThe foaming agent master batch comprises the following components in parts by weight: 70 parts by weight of polypropylene resin powder, 25 parts by weight of foaming agent and 0.8 part by weight of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by silane coupling agent, the auxiliary agent comprises antioxidant, light stabilizer and lubricant, the antioxidant comprises 0.2 part by weight of antioxidant 1010 and 0.2 part by weight of antioxidant 168, the light stabilizer is 0.2 part by weight of light stabilizer 3808PP5, the lubricant is 0.2 part by weight of calcium stearate, the average particle size of the polypropylene resin powder is 0.9mm, the weight percentage of the particle size distribution is respectively 0.5-1.5 mm, and the bulk density of the oligomeric propylene resin powder is 0.38g/cm3。
Example 6
As a foaming agent master batch of the embodiment of the invention, the bulk density of the oligomeric propylene resin powder is 0.32 g/cm3Other components and preparation process were the same as in example 1.
Example 7
As a foaming agent master batch of the embodiment of the invention, the bulk density of the low polypropylene resin powder is 0.42 g/cm3Other components and preparation process were the same as in example 1.
Comparative example 1
The only difference between the foaming agent master batch as a comparative example of the invention and the example 1 is as follows: the sodium bicarbonate surface-treated with the silane coupling agent of example 1 was replaced with sodium bicarbonate.
Comparative example 2
The only difference between the foaming agent master batch as a comparative example of the invention and the example 1 is as follows: the polypropylene resin powder of example 1 was replaced with polypropylene resin particles having an average particle diameter of (3 ± 0.2) × (3 ± 0.2) mm.
Comparative example 3
The only difference between the foaming agent master batch as a comparative example of the invention and the example 1 is as follows: the average particle diameter of the polypropylene resin powder is 2mm, and the bulk density of the polypropylene resin powder is 0.43g/cm3。
Effect example 1
The blowing agent master batches of examples 1 to 7 and comparative examples 1 to 3 were injection-molded into foamed test panels in a claus morphine injection machine in the following formulation, and the uniformity of cells and the size of cells were observed with a microscope, and the mechanical properties of the foamed test panels were measured.
The foaming test board formula comprises: 70 parts of polypropylene particles (with the average particle size of 3 +/-0.2 +/-3.2 mm), 10 parts of talcum powder, 19 parts of polyethylene-butylene serving as a toughening agent, 1 part of additive master batch and 3 parts of foaming agent master batch, wherein the additive master batch comprises: the antioxidant comprises 0.25 weight part of antioxidant 1010 and 0.25 weight part of antioxidant 168, the light stabilizer is 0.25 weight part of light stabilizer 3808PP5, and the lubricant is 0.25 weight part of calcium stearate.
The results of the foaming test plate performance test are shown in table 1.
Surface: and carrying out visual observation and evaluation by adopting a light plate foaming mold.
Impact strength of the simply supported beam notch: the test was performed using a Zwick HIT5.5P electronic display impact tester.
Tensile strength and flexural modulus: the test was carried out using a Zwick Z005 electronic universal tester.
TABLE 1 foaming Properties of foaming agent master batches of examples 1 to 7 and comparative examples 1 to 3
As can be seen from Table 1, the foaming agent master batch of the embodiment has good secondary die sinking foaming performance, the diameter of the foam hole is 80-150 μm when the foaming ratio is 1.6, and the bubbles (silver strips) on the surface of the part are few.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The foaming agent master batch is characterized by comprising the following components in parts by weight: 40-65 parts of polypropylene resin powder, 35-60 parts of foaming agent and 0.2-2 parts of auxiliary agent, wherein the foaming agent is sodium bicarbonate subjected to surface treatment by silane coupling agent, the average particle size of the polypropylene resin powder is 0.5-1.5 mm, and the bulk density of the polypropylene resin powder is 0.32-0.42 g/cm3；
The preparation method of the foaming agent master batch comprises the following steps: mixing the polypropylene resin powder, the foaming agent and the auxiliary agent to obtain the powdery foaming agent master batch.
2. The foaming master batch according to claim 1, wherein the weight ratio of the polypropylene resin powder to the foaming agent is (50-65): (35-50).
3. The foaming agent masterbatch according to claim 1, wherein the weight ratio of the polypropylene resin powder to the foaming agent is (50-60): (40-50).
4. The foaming concentrate of any one of claims 1-3, wherein the auxiliary agent comprises at least one of an antioxidant, a light stabilizer, and a lubricant.
5. The foaming concentrate of claim 4, wherein the antioxidant is at least one of a hindered phenolic antioxidant and a phosphite antioxidant.
6. The foaming concentrate of claim 4, wherein the light stabilizer is a hindered amine light stabilizer.
7. The foaming concentrate of claim 4, wherein the lubricant is at least one of glyceryl monostearate and a metal stearate compound.
8. Use of the foaming agent masterbatch of any one of claims 1-7 in plastic foamed sheets.
9. A plastic foaming plate is characterized in that: the foaming agent masterbatch of any one of claims 1-7 accounts for 2-5 wt% of the foaming agent board.
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| CN104987526A (en) * | 2015-04-27 | 2015-10-21 | 中国科学院长春应用化学研究所 | Polypropylene series resin composite foam particle, and preparation method and application thereof |
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| CN109294147A (en) * | 2018-09-29 | 2019-02-01 | 杨鼎杰 | A kind of resilience polypropylene material and preparation method thereof |
| CN109988362A (en) * | 2019-04-18 | 2019-07-09 | 清大荟素(淄博)新材料有限公司 | A kind of micro-foaming polypropylene material and preparation method thereof |
| CN211999541U (en) * | 2018-01-10 | 2020-11-24 | 杭州汉克斯隔音技术工程有限公司 | Flame-retardant low-heat-conductivity foamed polypropylene plate |
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2020
- 2020-12-14 CN CN202011479543.8A patent/CN112608555B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1182225A1 (en) * | 2000-08-24 | 2002-02-27 | Kaneka Corporation | Process for preparing polyolefin pre-expanded particles |
| CN1593899A (en) * | 2004-07-15 | 2005-03-16 | 四川大学 | Preparation method of polypropylene millipore filtration sheet material |
| CN101560307A (en) * | 2009-05-19 | 2009-10-21 | 四川大学 | Method for preparing low density polypropylene foam section or beads by two-step extrusion molding |
| CN103881238A (en) * | 2014-03-25 | 2014-06-25 | 苏州润佳工程塑料股份有限公司 | Modified foaming agent of polypropylene foaming material and preparation method modified foaming agent |
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| CN211999541U (en) * | 2018-01-10 | 2020-11-24 | 杭州汉克斯隔音技术工程有限公司 | Flame-retardant low-heat-conductivity foamed polypropylene plate |
| CN108409998A (en) * | 2018-03-30 | 2018-08-17 | 福建省灿辉环保科技有限公司 | A kind of solid-state environment-friendly foaming agent and preparation method thereof |
| CN109294147A (en) * | 2018-09-29 | 2019-02-01 | 杨鼎杰 | A kind of resilience polypropylene material and preparation method thereof |
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