CN103965408A - Method for preparing polystyrene with low heat conductivity - Google Patents
Method for preparing polystyrene with low heat conductivity Download PDFInfo
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- CN103965408A CN103965408A CN201410170106.6A CN201410170106A CN103965408A CN 103965408 A CN103965408 A CN 103965408A CN 201410170106 A CN201410170106 A CN 201410170106A CN 103965408 A CN103965408 A CN 103965408A
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Abstract
The invention provides a method for preparing polystyrene with low heat conductivity. The method comprises the following steps: preparing a mixture of phenethylene, ethylene copolymer and polystyrene; separating and converting the mixture, and preparing a polystyrene colloid; adding heat insulating materials and flame-retardant materials in a reaction kettle; cooling down for discharging, washing, and drying to obtain polystyrene beads; foaming, slaking and molding to obtain polystyrene with the low heat conductivity. The method has the characteristics that the preparation technology is strong in controllability, and the polystyrene obtained by the method is good in heat preservation, favorable in flame retardancy, good in mechanical property and long in service life.
Description
Technical field
The invention belongs to chemical materials manufacture field, be specifically related to the preparation method of the polystyrene that a kind of thermal conductivity is low.
Background technology
Polystyrene refers to by styrene monomer through the synthetic polymkeric substance of free radical polymerization, it is a kind of water white thermoplastics, cheap and be easy to machine-shaping, add superior heat preservation and insulation, be therefore widely used in the lagging material of external wall.
But because base vinylbenzene is the rigid foam taking C and H as a kind of unicellular structure of principal element, make its limiting oxygen index(LOI) lower, thermal conductivity is higher, not only at lower temperature, just can burn, once and catch fire and will acutely burn, flame spreads and diffuses to whole surface at a high speed, makes the melting of base material high shrinkage, does not become charcoal, can produce a large amount of black smog, toxic gas and the molten drop with naked light simultaneously, cause burning more serious.
In prior art, in order to make polystyrene plastic there is good flame retardant resistance in insulation, conventionally at the surface-coated fire retardant of polystyrene plastic, but the consistency of fire retardant and polystyrene is poor, the mechanical property of the polystyrene plastic obtaining is poor, is difficult to reach the service requirements of external-wall heat-insulation material.If directly add fire retardant in the time preparing polystyrene, not only thermal conductivity can raise, and heat-insulating property variation also can be brought a series of safety problems simultaneously.
Therefore the preparation method who, develops the polystyrene that a kind of thermal conductivity is low is the new problem that those skilled in the art require study.
Summary of the invention
In order to address the above problem, the invention provides the preparation method of the polystyrene that a kind of thermal conductivity is low, the polystyrene obtaining, in having outstanding heat retaining property, also has good flame retardant resistance.
In order to achieve the above object, the invention provides following technical scheme:
A preparation method for the polystyrene that thermal conductivity is low, is characterized in that:
Concrete steps are:
(1), in pre-transform teactor, add polystyrene material, comprise styrene monomer, ethylene copolymer and auxiliary addition agent, polymerizing styrene monomer forms polystyrene; Described polymerization proceeds to the 62-96% that transformation efficiency is the phase inversion start point of the vinylbenzene-ethylene copolymer-polystyrene blends of formation;
(2), the vinylbenzene-ethylene copolymer-polystyrene blends forming in step (1) is separated, with the second logistics that generates the first logistics that comprises the 64-95wt% of mixture in formed step (1) and comprise mixture in step that surplus is formed (1);
(3), in the second reactor, add the first logistics, carry out further styrene polymerization, cause the inversion of phases of the first logistics;
(4), by the second logistics obtaining in inversion of phases the first logistics in step (3) and step (2) with 25-33s
-1shearing rate in static mixer, mix, carry out inversion of phases for the second time, generate polystyrene colloid;
(5), the polystyrene colloid obtaining in step (4) is dropped in high pressure polymerisation reactor, add asbestos, fiber suede, perlite, aluminium silicate wool, water, permeate agent, dispersion agent, emulsifying agent and initiator, speed with 5 DEG C/min is warming up to 85-95 DEG C, stirs gradually and keeps still temperature;
(6), in the time that reflection in still reaches 85-90% reactivity, add hypo-aluminum orthophosphate, whipping agent and active calcium phosphate, and stir;
(7) temperature of reactor is risen to 120-135 DEG C, be incubated 1 hour;
(8) cooling discharge washing are dry, obtain polystyrene bead;
(9) polystyrene bead obtaining in step (8) is put into foam maker and foam, by the at room temperature slaking of the alveolar sphere of pre-frothing, enter mould, obtain the polystyrene that described thermal conductivity is low.
The invention provides a kind of method of preparing the polystyrene that thermal conductivity is low, mainly comprise and prepare vinylbenzene-ethylene copolymer-polystyrene blends; Separating mixture, inversion of phases are also prepared polystyrene colloid; In reactor, add lagging material and fire retardant material; Cooling discharge, washing are dried, obtain polystyrene bead; Foaming, slaking, enter mould and obtain the polystyrene that thermal conductivity is low.
First styrene monomer, ethylene copolymer and auxiliary addition agent are added in pre-transform teactor, carry out polyreaction, form vinylbenzene-ethylene copolymer-polystyrene blends; The present invention uses ethylene copolymer to substitute polydiene of the prior art, and ethene copolymer, compared with polydiene, has the features such as good stability, ageing-resistant, easy processing, low-cost and high-performance, and can immediately add, and controllability is strong.
Vinylbenzene-ethylene copolymer-polystyrene blends is separated into the first logistics and the second logistics, the first logistics is carried out to inversion of phases, remix carries out inversion of phases for the second time with the second logistics, forms polystyrene colloid.
Afterwards the polystyrene colloid tentatively obtaining is dropped in high pressure polymerisation reactor, add asbestos, fiber suede, perlite, aluminium silicate wool, water, permeate agent, dispersion agent, emulsifying agent and initiator, speed with 5 DEG C/min is warming up to 85-95 DEG C, stirs gradually and keeps still temperature.More than, for adding lagging material, use asbestos, fiber suede, perlite, aluminium silicate wool to have the following advantages as lagging material: not skin irritation, to the person without injury; Without the dust pollution that scatters and disappears, nontoxic, meet environmental requirement; Acid and alkali-resistance, corrosion-free and thermal conductivity is low, thermosteresis is few.After adding permeate agent, dispersion agent, emulsifying agent and initiator, can make to promote polystyrene surface layer hardness with light, promote toughness, moulding processability is good.
With adding hypo-aluminum orthophosphate, whipping agent and active calcium phosphate in backward reactor; Hypo-aluminum orthophosphate is inorganic phosphorus flame retardant, and phosphorus content is high, and aluminium element has the cigarette effect of pressing down; Active calcium phosphate can be served as dispersion agent.
As preferably, in step (1), styrene monomer accounts for the 65-80% of polystyrene material mass percent, and ethylene copolymer accounts for the 15-25% of polystyrene material mass percent, and auxiliary addition agent accounts for the 5-10% of polystyrene material mass percent.
As preferably, auxiliary addition agent comprises expanding material, stablizer and white oil, and the mass percent of each composition is: expanding material: 75-85%, stablizer: 10-20%, white oil: 5-10%.
Auxiliary addition agent comprises expanding material, stablizer and white oil; Adding expanding material can be by intermolecular linkage force, vinyl monomer and ethylene copolymer is combined as a whole, and then obtains stable mixture; Add the stablizer polyreaction that can slow down, keep chemical equilibrium, reduce mixture surface tension, prevent the effects such as light, thermolysis or oxygenolysis; Add white oil and can make mixture become glossy, bright-coloured, can improve the properties that obtains mixture after vinyl monomer is combined with ethylene copolymer.
As preferably, asbestos, fiber suede, perlite, aluminium silicate wool, water, permeate agent, dispersion agent, emulsifying agent and the shared mass percent of initiator in step (5) are respectively: 15-25%, 15-36%, 35-42%, 4-8%, 18-25%, 1.5-2%, 1.5-2.5%, 0.7-1.4% and 3-7%.
As preferably, in step (6), hypo-aluminum orthophosphate, whipping agent and the shared mass percent of active calcium phosphate are respectively: 30-45%, 10-25%, 40-60%.
Compared with the preparation method of the polystyrene that the present invention is low with existing thermal conductivity, use ethylene copolymer to substitute existing polydiene; In polystyrene, add asbestos, fiber suede, perlite, aluminium silicate wool as lagging material, and add permeate agent, dispersion agent, emulsifying agent and initiator and promote its upper layer performance and moulding processability; Finally using again hypo-aluminum orthophosphate and active calcium phosphate, is that polystyrene flame retardant resistance is more outstanding.Therefore beneficial effect of the present invention is: (1) preparation technology's controllability is strong; (2) polystyrene obtaining also has good flame retardant resistance in having outstanding heat retaining property; (3) the polystyrene excellent mechanical obtaining, long service life.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is elaborated, should understands following embodiment and only be not used in and limit the scope of the invention for the present invention is described.
Embodiment 1:
A preparation method for the polystyrene that thermal conductivity is low, concrete steps are:
(1), in pre-transform teactor, add polystyrene material, comprise 65% styrene monomer, 25% ethylene copolymer and 10% auxiliary addition agent, polymerizing styrene monomer forms polystyrene; Described polymerization proceed to transformation efficiency be form vinylbenzene-ethylene copolymer-polystyrene blends phase inversion start point 62%; Wherein auxiliary addition agent comprises 75% expanding material, 20% stablizer and 5% white oil.
(2), the vinylbenzene-ethylene copolymer-polystyrene blends forming in step (1) is separated, with the second logistics that generates the first logistics that comprises the 64wt% of mixture in formed step (1) and comprise mixture in step that surplus is formed (1).
(3), in the second reactor, add the first logistics, carry out further styrene polymerization, cause the inversion of phases of the first logistics.
(4), by the second logistics obtaining in inversion of phases the first logistics in step (3) and step (2) with 26s
-1shearing rate in static mixer, mix, carry out inversion of phases for the second time, generate polystyrene colloid.
(5), the polystyrene colloid obtaining in step (4) is dropped in high pressure polymerisation reactor, add 18% asbestos, 15% fiber suede, 35% perlite, 4% aluminium silicate wool, 18% water, 1.5% permeate agent, 1.5% dispersion agent, 0.7% emulsifying agent and 6.3% initiator, be warming up to 85 DEG C with the speed of 5 DEG C/min, stir gradually and keep still temperature.
(6) in the time that reflection in still reaches 85% reactivity, the hypo-aluminum orthophosphate of interpolation 30%, 10% whipping agent and 60% active calcium phosphate, and stir.
(7) temperature of reactor is risen to 120 DEG C, be incubated 1 hour.
(8) cooling discharge washing are dry, obtain polystyrene bead.
(9) polystyrene bead obtaining in step (8) is put into foam maker and foam, by the at room temperature slaking of the alveolar sphere of pre-frothing, enter mould, obtain the polystyrene that described thermal conductivity is low.
Embodiment 2:
A preparation method for the polystyrene that thermal conductivity is low, concrete steps are:
(1), in pre-transform teactor, add polystyrene material, comprise 72% styrene monomer, 20% ethylene copolymer and 8% auxiliary addition agent, polymerizing styrene monomer forms polystyrene; Described polymerization proceed to transformation efficiency be form vinylbenzene-ethylene copolymer-polystyrene blends phase inversion start point 85%; Wherein auxiliary addition agent comprises 80% expanding material, 10% stablizer and 10% white oil.
(2), the vinylbenzene-ethylene copolymer-polystyrene blends forming in step (1) is separated, with the second logistics that generates the first logistics that comprises the 82wt% of mixture in formed step (1) and comprise mixture in step that surplus is formed (1).
(3), in the second reactor, add the first logistics, carry out further styrene polymerization, cause the inversion of phases of the first logistics.
(4), by the second logistics obtaining in inversion of phases the first logistics in step (3) and step (2) with 30s
-1shearing rate in static mixer, mix, carry out inversion of phases for the second time, generate polystyrene colloid.
(5), the polystyrene colloid obtaining in step (4) is dropped in high pressure polymerisation reactor, add 15% asbestos, 18% fiber suede, 37% perlite, 4% aluminium silicate wool, 18% water, 2.1% permeate agent, 1.5% dispersion agent, 1.4% emulsifying agent and 3% initiator, be warming up to 90 DEG C with the speed of 5 DEG C/min, stir gradually and keep still temperature.
(6) in the time that reflection in still reaches 88% reactivity, the hypo-aluminum orthophosphate of interpolation 40%, 18% whipping agent and 42% active calcium phosphate, and stir.
(7) temperature of reactor is risen to 130 DEG C, be incubated 1 hour.
(8) cooling discharge washing are dry, obtain polystyrene bead.
(9) polystyrene bead obtaining in step (8) is put into foam maker and foam, by the at room temperature slaking of the alveolar sphere of pre-frothing, enter mould, obtain the polystyrene that described thermal conductivity is low.
Embodiment 3:
A preparation method for the polystyrene that thermal conductivity is low, concrete steps are:
(1), in pre-transform teactor, add polystyrene material, comprise 80% styrene monomer, 15% ethylene copolymer and 5% auxiliary addition agent, polymerizing styrene monomer forms polystyrene; Described polymerization proceed to transformation efficiency be form vinylbenzene-ethylene copolymer-polystyrene blends phase inversion start point 95%; Wherein auxiliary addition agent comprises 85% expanding material, 10% stablizer and 5% white oil.
(2), the vinylbenzene-ethylene copolymer-polystyrene blends forming in step (1) is separated, with the second logistics that generates the first logistics that comprises the 95wt% of mixture in formed step (1) and comprise mixture in step that surplus is formed (1).
(3), in the second reactor, add the first logistics, carry out further styrene polymerization, cause the inversion of phases of the first logistics.
(4), by the second logistics obtaining in inversion of phases the first logistics in step (3) and step (2) with 33s
-1shearing rate in static mixer, mix, carry out inversion of phases for the second time, generate polystyrene colloid.
(5), the polystyrene colloid obtaining in step (4) is dropped in high pressure polymerisation reactor, add 16% asbestos, 15% fiber suede, 37% perlite, 5% aluminium silicate wool, 18% water, 2.5% permeate agent, 1.5% dispersion agent, 1% emulsifying agent and 4% initiator, be warming up to 95 DEG C with the speed of 5 DEG C/min, stir gradually and keep still temperature.
(6) in the time that reflection in still reaches 90% reactivity, the hypo-aluminum orthophosphate of interpolation 45%, 15% whipping agent and 40% active calcium phosphate, and stir.
(7) temperature of reactor is risen to 135 DEG C, be incubated 1 hour.
(8) cooling discharge washing are dry, obtain polystyrene bead.
(9) polystyrene bead obtaining in step (8) is put into foam maker and foam, by the at room temperature slaking of the alveolar sphere of pre-frothing, enter mould, obtain the polystyrene that described thermal conductivity is low.
The disclosed technique means of the present invention program is not limited only to the disclosed technique means of above-mentioned embodiment, also comprises the technical scheme being made up of above technical characterictic arbitrary combination.
Claims (5)
1. a preparation method for the polystyrene that thermal conductivity is low, is characterized in that:
Concrete steps are:
(1), in pre-transform teactor, add polystyrene material, comprise styrene monomer, ethylene copolymer and auxiliary addition agent, polymerizing styrene monomer forms polystyrene; Described polymerization proceeds to the 62-96% that transformation efficiency is the phase inversion start point of the vinylbenzene-ethylene copolymer-polystyrene blends of formation;
(2), the vinylbenzene-ethylene copolymer-polystyrene blends forming in step (1) is separated, with the second logistics that generates the first logistics that comprises the 64-95wt% of mixture in formed step (1) and comprise mixture in step that surplus is formed (1);
(3), in the second reactor, add the first logistics, carry out further styrene polymerization, cause the inversion of phases of the first logistics;
(4), by the second logistics obtaining in inversion of phases the first logistics in step (3) and step (2) with 25-33s
-1shearing rate in static mixer, mix, carry out inversion of phases for the second time, generate polystyrene colloid;
(5), the polystyrene colloid obtaining in step (4) is dropped in high pressure polymerisation reactor, add asbestos, fiber suede, perlite, aluminium silicate wool, water, permeate agent, dispersion agent, emulsifying agent and initiator, speed with 5 DEG C/min is warming up to 85-95 DEG C, stirs gradually and keeps still temperature;
(6), in the time that reflection in still reaches 85-90% reactivity, add hypo-aluminum orthophosphate, whipping agent and active calcium phosphate, and stir;
(7) temperature of reactor is risen to 120-135 DEG C, be incubated 1 hour;
(8) cooling discharge washing are dry, obtain polystyrene bead;
(9) polystyrene bead obtaining in step (8) is put into foam maker and foam, by the at room temperature slaking of the alveolar sphere of pre-frothing, enter mould, obtain the polystyrene that described thermal conductivity is low.
2. the preparation method of the polystyrene that a kind of thermal conductivity according to claim 1 is low, it is characterized in that: in described step (1), styrene monomer accounts for the 65-80% of polystyrene material mass percent, ethylene copolymer accounts for the 15-25% of polystyrene material mass percent, and auxiliary addition agent accounts for the 5-10% of polystyrene material mass percent.
3. the preparation method of the polystyrene that a kind of thermal conductivity according to claim 1 and 2 is low, it is characterized in that: described auxiliary addition agent comprises expanding material, stablizer and white oil, and the mass percent of each composition is: expanding material: 75-85%, stablizer: 10-20%, white oil: 5-10%.
4. the preparation method of the polystyrene that a kind of thermal conductivity according to claim 1 is low, is characterized in that: asbestos, fiber suede, perlite, aluminium silicate wool, water, permeate agent, dispersion agent, emulsifying agent and the shared mass percent of initiator in described step (5) are respectively: 15-25%, 15-36%, 35-42%, 4-8%, 18-25%, 1.5-2%, 1.5-2.5%, 0.7-1.4% and 3-7%.
5. the preparation method of the polystyrene that a kind of thermal conductivity according to claim 1 is low, is characterized in that: in described step (6), hypo-aluminum orthophosphate, whipping agent and the shared mass percent of active calcium phosphate are respectively: 30-45%, 10-25%, 40-60%.
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| CN102558697A (en) * | 2012-01-11 | 2012-07-11 | 长春工业大学 | Preparation method of ultrahigh-toughness polystyrene resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102558697A (en) * | 2012-01-11 | 2012-07-11 | 长春工业大学 | Preparation method of ultrahigh-toughness polystyrene resin |
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