CN115433385A - Preparation method of expanded polystyrene - Google Patents
Preparation method of expanded polystyrene Download PDFInfo
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- CN115433385A CN115433385A CN202211147383.6A CN202211147383A CN115433385A CN 115433385 A CN115433385 A CN 115433385A CN 202211147383 A CN202211147383 A CN 202211147383A CN 115433385 A CN115433385 A CN 115433385A
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- polystyrene
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- expanded polystyrene
- modified attapulgite
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- 239000004794 expanded polystyrene Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229960000892 attapulgite Drugs 0.000 claims abstract description 42
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 42
- 238000003756 stirring Methods 0.000 claims abstract description 32
- 229920000642 polymer Polymers 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims abstract description 16
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005187 foaming Methods 0.000 claims abstract description 12
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- 229920006248 expandable polystyrene Polymers 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- CADZRPOVAQTAME-UHFFFAOYSA-L calcium;hydroxy phosphate Chemical compound [Ca+2].OOP([O-])([O-])=O CADZRPOVAQTAME-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 6
- 229920006327 polystyrene foam Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 20
- 239000004793 Polystyrene Substances 0.000 abstract description 20
- 239000003063 flame retardant Substances 0.000 abstract description 20
- 229920002223 polystyrene Polymers 0.000 abstract description 20
- 239000000463 material Substances 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 4
- 102000002067 Protein Subunits Human genes 0.000 abstract 1
- 108010001267 Protein Subunits Proteins 0.000 abstract 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 9
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000012796 inorganic flame retardant Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Classifications
-
- 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
- C08J9/12—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 physical blowing agent
- C08J9/14—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 physical blowing agent organic
- C08J9/141—Hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F112/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F112/02—Monomers containing only one unsaturated aliphatic radical
- C08F112/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F112/06—Hydrocarbons
- C08F112/08—Styrene
-
- 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
- C08J9/0066—Use of inorganic compounding ingredients
-
- 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
- C08J9/009—Use of pretreated compounding ingredients
-
- 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
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
-
- 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
- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
-
- 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
- C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2425/02—Homopolymers or copolymers of hydrocarbons
- C08J2425/04—Homopolymers or copolymers of styrene
- C08J2425/06—Polystyrene
Abstract
The invention discloses a preparation method of expanded polystyrene, belonging to the technical field of expanded materials, comprising the following steps of prepolymerization: waste expandable polystyrene, styrene, modified attapulgite and BPO are put into a high-pressure reaction kettle to be prepolymerized to obtain a protomer; polymerization: putting the initial polymer, calcium hydroxy phosphate and n-pentane into a high-pressure reaction kettle for polymerization to obtain a polymer; and (4) foaming. The flame retardant property of the expanded polystyrene can be improved by adding the modified attapulgite, in addition, the modified attapulgite is not directly melt-blended with the polystyrene but added in the polystyrene prepolymerization process, the uniform dispersion of the modified attapulgite in the polystyrene is promoted in the stirring polymerization process, the agglomeration phenomenon of the modified attapulgite is further improved, and the improvement of the flame retardant property is realized on the basis of not reducing the mechanical property of the expanded polystyrene.
Description
Technical Field
The invention belongs to the technical field of foaming materials, and particularly relates to a preparation method of expanded polystyrene.
Background
The polystyrene foam has excellent productivity, light weight and low price, and is widely applied to various fields of light industry, building industry and the like. Polystyrene is an organic hydrocarbon like a plurality of polymers, belongs to a flammable material, generates molten drops with open fire in the combustion process, releases toxic gas, further increases the threat of fire and the difficulty of extinguishing the fire, and limits the application of polystyrene in various industries. It is therefore necessary to adopt flame retardant treatment for flammable polystyrene products.
In the prior art, in order to improve the flame retardant property of the expanded polystyrene, a halogen-containing flame retardant is added, and the halogen-containing flame retardant can release toxic substances in the combustion or heating process, so that the environment-friendly requirement is not met. In the prior art, in order to improve the flame retardant property of the expanded polystyrene, an environment-friendly inorganic flame retardant is added, but the inorganic flame retardant is easy to agglomerate in the melt blending process of the polystyrene, so that the mechanical property of the expanded polystyrene is influenced, and a higher flame retardant effect is difficult to exert. In recent years, with the enhancement of safety and environmental protection consciousness, the development and production of high-efficiency environment-friendly flame-retardant expanded polystyrene materials are very important.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of expanded polystyrene.
The flame retardant property of the expanded polystyrene can be improved by adding the modified attapulgite, in addition, the modified attapulgite is not directly melt-blended with the polystyrene but added in the polystyrene prepolymerization process, the uniform dispersion of the modified attapulgite in the polystyrene is promoted in the stirring polymerization process, the agglomeration phenomenon of the modified attapulgite is further improved, and the improvement of the flame retardant property is realized on the basis of not reducing the mechanical property of the expanded polystyrene.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of expanded polystyrene comprises the following steps:
step one, prepolymerization: putting waste expandable polystyrene and styrene into a high-pressure reaction kettle, starting stirring, controlling the temperature in the kettle to be 40 ℃, stirring for 15-20min at 500r/min, putting modified attapulgite and BPO (dibenzoyl peroxide) into the reaction kettle, raising the temperature in the kettle to 82 ℃, continuing stirring for 30min, adding a dispersant solution into the reaction kettle, setting the temperature in the kettle to be 79 ℃ and keeping for 90-100min, raising the temperature in the kettle to 81 ℃ and keeping for 4h, then raising the temperature to 86 ℃ and keeping for 6h, finally cooling the system temperature to be below 40 ℃, discharging, washing and drying to obtain a primary polymer;
second step, polymerization: putting the initial polymer, calcium hydroxy phosphate and n-pentane into a high-pressure reaction kettle, stirring for 30min at 550r/min, setting the temperature in the kettle to be 90 ℃, continuing stirring for 6h at constant temperature, discharging when the temperature is reduced to be below 30 ℃, and washing and drying to obtain a polymer;
step three, foaming: placing the polymer at 95 ℃ for 2-3min for pre-foaming, then transferring to normal temperature and normal pressure for 24h, finally introducing superheated steam for heating, keeping heating for 20-30s, and cooling with water to obtain the polystyrene foam.
Furthermore, the ratio of the used expandable polystyrene, the styrene, the modified attapulgite, the BPO and the dispersant solution in the first step is 8g to 28g; the dispersant is a long-chain polymer dispersant, and the concentration of the dispersant solution is 0.37g/20mL;
furthermore, the long-chain polymer dispersant is NJEKA6070/6071 dispersant; the long-chain polymer dispersing agent can be attached to the surface of the monomer liquid drop to play a role in preventing adhesion and promoting the dispersion of the modified attapulgite.
Furthermore, the ratio of the used amounts of the initial polymer, calcium hydroxy phosphate and n-pentane in the second step is 150g.
Further, the modified attapulgite is prepared by the following steps:
adding attapulgite and a hydrochloric acid solution (the concentration is 0.3 mol/L) into a flask, uniformly mixing, stirring for 2 hours in a water bath at 60 ℃, performing ultrasonic treatment for 30 minutes at room temperature, centrifugally cleaning with deionized water until the cleaning solution is neutral, drying at 65 ℃, and grinding to obtain modified attapulgite; the ratio of the dosage of the attapulgite to the dosage of the hydrochloric acid solution is 10g;
after the attapulgite is acidified and etched, a large number of micropores can be formed on the surface of the attapulgite, so that the specific surface area of the attapulgite is further increased, and when a matrix (polystyrene) is burnt, crystal water in the matrix (polystyrene) can be released through the micropores in a large amount, so that the heat release amount and the heat release rate of the polystyrene can be effectively reduced; in addition, the attapulgite as a magnesium-aluminum-rich mineral can generate MgO and Al in a high-temperature environment 2 O 3 The oxide isolation layer is mainly an oxide isolation layer, and the oxides have higher melting point and better thermal stability and have certain flame retardant effect; therefore, the flame retardant property of the expanded polystyrene can be improved by adding the modified attapulgite, and in addition, the modified attapulgite is not directly melt-blended with the polystyrene (in such a way, inorganic materials are difficult to be uniformly dispersed in a polymer matrix), but is added in the polystyrene prepolymerization process, so that the uniform dispersion of the modified attapulgite in the polystyrene is firstly promoted in the stirring polymerization process, the agglomeration phenomenon of the modified attapulgite is further improved, and the improvement of the flame retardant property is realized on the basis of not reducing the mechanical property of the expanded polystyrene.
The invention has the beneficial effects that:
in addition, the modified attapulgite is not directly melt-blended with polystyrene but added in the polystyrene prepolymerization process, the uniform dispersion of the modified attapulgite in the polystyrene is promoted in the stirring polymerization process, the agglomeration phenomenon of the modified attapulgite is further improved, and the improvement of the flame retardant property is realized on the basis of not reducing the mechanical property of the foamed polystyrene;
in the invention, part of waste expanded polystyrene is used as a raw material, so that the waste utilization can be realized, the production and manufacturing cost is reduced, and the environmental protection requirement is met.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing modified attapulgite:
adding 10g of attapulgite and 300mL of hydrochloric acid solution (the concentration is 0.3 mol/L) into a flask, uniformly mixing, stirring in a water bath at 60 ℃ for 2 hours, performing ultrasonic treatment at room temperature for 30 minutes, performing centrifugal cleaning by using deionized water until the cleaning solution is neutral, drying at 65 ℃, and grinding to obtain the modified attapulgite.
Example 2
A preparation method of expanded polystyrene comprises the following steps:
step one, prepolymerization: putting 80g of waste expandable polystyrene and 280g of styrene into a high-pressure reaction kettle, starting stirring, controlling the temperature in the kettle to be 40 ℃, stirring for 15min at 500r/min, then putting 10g of modified attapulgite prepared in example 1 and 3g of BPO (dibenzoyl peroxide) into the reaction kettle, raising the temperature in the kettle to 82 ℃, continuing stirring for 30min, adding 200mL of a dispersing agent solution (NJEKA 6070 dispersing agent with the concentration of 0.37g/20 mL), setting the temperature in the kettle to be 79 ℃ and keeping the temperature for 90min, raising the temperature in the kettle to 81 ℃ and keeping the temperature for 4h, then raising the temperature to 86 ℃ and keeping the temperature for 6h, finally cooling the system temperature to be below 40 ℃, discharging, washing and drying to obtain an initial polymer;
second step, polymerization: putting 300g of the pre-polymer, 2g of calcium hydroxy phosphate and 31g of n-pentane into a high-pressure reaction kettle, stirring at 550r/min for 30min, setting the temperature in the kettle to be 90 ℃, continuing stirring at constant temperature for 6h, discharging when the temperature is reduced to below 30 ℃, washing and drying to obtain a polymer;
step three, foaming: and (3) pre-foaming the polymer at 95 ℃ for 2min, then transferring to normal temperature and normal pressure, standing for 24h, finally introducing superheated steam for heating, keeping heating for 20s, and cooling by water to obtain the polystyrene foam.
Example 3
A preparation method of expanded polystyrene comprises the following steps:
step one, prepolymerization: putting 80g of waste expandable polystyrene and 280g of styrene into a high-pressure reaction kettle, starting stirring, controlling the temperature in the kettle to be 40 ℃, stirring at 500r/min for 18min, then putting 10g of modified attapulgite prepared in example 1 and 3g of BPO (dibenzoyl peroxide) into the reaction kettle, raising the temperature in the kettle to 82 ℃, continuing stirring for 30min, adding 200mL of a dispersing agent solution (NJEKA 6071 dispersing agent with the concentration of 0.37g/20 mL), setting the temperature in the kettle to be 79 ℃ and keeping the temperature for 95min, raising the temperature in the kettle to 81 ℃ and keeping the temperature for 4h, then raising the temperature to 86 ℃ and keeping the temperature for 6h, finally cooling the system temperature to be below 40 ℃, discharging, washing and drying to obtain an initial polymer;
second step, polymerization: putting 300g of the pre-polymer, 2g of calcium hydroxy phosphate and 31g of n-pentane into a high-pressure reaction kettle, stirring at 550r/min for 30min, setting the temperature in the kettle to be 90 ℃, continuing stirring at constant temperature for 6h, discharging when the temperature is reduced to below 30 ℃, washing and drying to obtain a polymer;
step three, foaming: placing the polymer at 95 ℃ for 2.5min for pre-foaming, then transferring to normal temperature and normal pressure for 24h, finally introducing superheated steam for heating, keeping heating for 25s, and cooling with water to obtain the polystyrene foam.
Example 4
A preparation method of expanded polystyrene comprises the following steps:
step one, prepolymerization: putting 80g of waste expandable polystyrene and 280g of styrene into a high-pressure reaction kettle, starting stirring, controlling the temperature in the kettle to be 40 ℃, stirring at 500r/min for 20min, putting 10g of modified attapulgite prepared in example 1 and 3g of BPO (dibenzoyl peroxide) into the reaction kettle, raising the temperature in the kettle to 82 ℃, continuing stirring for 30min, adding 200mL of a dispersing agent solution (NJEKA 6070 dispersing agent with the concentration of 0.37g/20 mL) into the reaction kettle, setting the temperature in the kettle to be 79 ℃ and keeping the temperature for 100min, raising the temperature in the kettle to 81 ℃ and keeping the temperature for 4h, then raising the temperature to 86 ℃ and keeping the temperature for 6h, finally cooling the system to be below 40 ℃, discharging, washing and drying to obtain an initial polymer;
second step, polymerization: putting 300g of the pre-polymer, 2g of calcium hydroxy phosphate and 31g of n-pentane into a high-pressure reaction kettle, stirring at 550r/min for 30min, setting the temperature in the kettle to be 90 ℃, continuing stirring at constant temperature for 6h, discharging when the temperature is reduced to below 30 ℃, washing and drying to obtain a polymer;
step three, foaming: and (3) pre-foaming the polymer at 95 ℃ for 3min, then transferring to normal temperature and normal pressure, standing for 24h, finally introducing superheated steam for heating, keeping heating for 30s, and cooling by water to obtain the polystyrene foam.
Comparative example
The modified attapulgite in example 3 was replaced with ordinary attapulgite, and the remaining raw materials and preparation process were unchanged.
The expanded polystyrene obtained in examples 3 to 5 and comparative example was processed into test specimens to be subjected to the following property tests:
mechanical properties: testing by using a mechanical property tester;
and (3) testing the flame retardant property: the LOI is tested according to GB/T2408-2008;
the results obtained are shown in the following table:
| example 3 | Example 4 | Example 5 | Comparative example | |
| Stress at Break/MPa | 36.5 | 36.9 | 36.8 | 35.2 |
| LOI/％ | 30.1 | 30.4 | 30.2 | 27.1 |
As can be seen from the data in the table above, the foamed polystyrene obtained by the invention has good mechanical properties; the flame retardant has an LOI coefficient of more than 30 percent, which indicates that the flame retardant has certain flame retardant property; the data of the comparative example show that the flame retardant property of the polystyrene can be improved after the attapulgite is modified.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only, and it will be appreciated by those skilled in the art that various modifications, additions and substitutions can be made to the embodiments described without departing from the scope of the invention as defined in the appended claims.
Claims (6)
1. The preparation method of the expanded polystyrene is characterized by comprising the following steps:
step one, prepolymerization: putting waste expandable polystyrene and styrene into a high-pressure reaction kettle, starting stirring, controlling the temperature in the kettle to be 40 ℃, stirring for 15-20min at 500r/min, putting modified attapulgite and BPO into the reaction kettle, raising the temperature in the kettle to 82 ℃, continuing stirring for 30min, adding a dispersant solution into the reaction kettle, setting the temperature in the kettle to be 79 ℃ and keeping for 90-100min, raising the temperature in the kettle to 81 ℃ and keeping for 4h, then raising the temperature to 86 ℃ and keeping for 6h, finally cooling the system temperature to be below 40 ℃, discharging, washing and drying to obtain a primary polymer;
second step, polymerization: putting the initial polymer, calcium hydroxy phosphate and n-pentane into a high-pressure reaction kettle, stirring for 30min at 550r/min, setting the temperature in the kettle to be 90 ℃, continuing stirring for 6h at constant temperature, discharging when the temperature is reduced to be below 30 ℃, and washing and drying to obtain a polymer;
step three, foaming: placing the polymer at 95 ℃ for 2-3min for pre-foaming, then transferring to normal temperature and normal pressure for 24h, finally introducing superheated steam for heating, keeping heating for 20-30s, and cooling with water to obtain the polystyrene foam.
2. The method for preparing expanded polystyrene according to claim 1, wherein the ratio of the used expandable polystyrene, the styrene, the modified attapulgite, the BPO and the dispersant solution in the first step is 8g 28g; the dispersant is long-chain polymer dispersant, and the concentration of the dispersant solution is 0.37g/20mL.
3. The method for preparing expanded polystyrene as claimed in claim 2, wherein said dispersant is NJEKA6070/6071 dispersant.
4. The process for preparing expanded polystyrene according to claim 1, wherein the ratio of the amounts of the prepolymer, calcium hydroxy phosphate and n-pentane used in the second step is 1501 g.
5. The method for preparing expanded polystyrene as claimed in claim 1, wherein the modified attapulgite is prepared by the steps of:
adding attapulgite and a hydrochloric acid solution into a flask, uniformly mixing, stirring in a water bath at 60 ℃ for 2h, performing ultrasonic treatment at room temperature for 30min, centrifugally cleaning with deionized water until the cleaning solution is neutral, drying at 65 ℃, and grinding to obtain the modified attapulgite.
6. The method for preparing expanded polystyrene as claimed in claim 5, wherein the ratio of the amount of the attapulgite to the amount of the hydrochloric acid solution is 10g; the concentration of the hydrochloric acid solution was 0.3mol/L.
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| CN202211147383.6A CN115433385A (en) | 2022-09-19 | 2022-09-19 | Preparation method of expanded polystyrene |
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| CN202211147383.6A Pending CN115433385A (en) | 2022-09-19 | 2022-09-19 | Preparation method of expanded polystyrene |
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