CN101089033A - Solid CO2 supercritical foaming process - Google Patents
Solid CO2 supercritical foaming process Download PDFInfo
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- CN101089033A CN101089033A CN 200710028410 CN200710028410A CN101089033A CN 101089033 A CN101089033 A CN 101089033A CN 200710028410 CN200710028410 CN 200710028410 CN 200710028410 A CN200710028410 A CN 200710028410A CN 101089033 A CN101089033 A CN 101089033A
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- sodium bicarbonate
- plastic cement
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- citric acid
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Abstract
The present invention relates to thermoplastic polymer foaming technology, and is especially solid CO2 supercritical foaming process. The solid CO2 supercritical foaming process includes mixing sodium bicarbonate and citric aid powder in certain proportion into plastic grains, heating the plastic grains to smelt into liquid with sodium bicarbonate and citric aid powder, increasing the temperature and pressure for sodium bicarbonate and citric aid to react chemically releasing CO2 in supercritical state and dissolved in liquid plastic, and lowering the temperature and pressure to foam and form the plastic. The process is simple, and has easy control on CO2 amount, high CO2 diffusion rate and dissolving rate, high production efficiency, low cost and high safety.
Description
Technical field:
The present invention relates to the foam process technical field of thermoplastic polymer, refer in particular to a kind of solid CO 2 supercritical foaming process.
Background technology:
Thermoplastic polymer (thermoplastics) forms crafters by after the foaming processing in plastics inner, thereby alleviates the weight of plastics, reduces the usage quantity of unit volume plastics, reduce production costs, more than 2 be the advantage of thermoplastic polymer foam process.The abscess-size that the tradition foam process is produced is big, cell density is low, product is subject to many limitations aspect use properties, and the microporous foam technology of present thermoplastic polymer and theory thereof are very ripe, microporous foam technology is to utilize the characteristic of gas under supercritical state, and gas can evenly be diffused into plastics inner rapidly under supercritical state, when removing the supercritical state of this kind gas suddenly, this gas promptly is covered by plastics inner, forms superfine crafters.The product inside that microporous foam technology is processed includes foam structure preferably, the crafters size that forms out is little, the density height, therefore, the product that microporous foam technology is processed is except that the characteristics with traditional foam process, also has multiple use properties, product structure intensity height also has heat-proof quality, can be used as uses such as material of construction, lagging material, even can the instead of part metallic substance and be used in the industry-by-industry, it is of many uses.
Though the microporous foam technology theory is ripe, makes it still have many deficiencies on commercial applications He on the suitability for industrialized production, present microporous foam technology is used high-pressure carbon dioxide gas more, and is shown in Figure 1, and its production process is as follows:
1, elder generation sends into thermoplastic polymer (plastic pellet) to heat in the screw rod and is melt into liquid state;
2, utilizing high-tension apparatus that high-pressure carbon dioxide gas is injected in the screw rod, is the thermoplastic polymer of liquid state and the two phase liquid of gaseous carbon dioxide in the screw rod;
3, pressure boost makes carbon dioxide be in supercritical state, and carbon dioxide is dissolved in the liquid thermoplastic polymkeric substance, becomes a single phase soln;
4, step-down nucleation reduces pressure, removes the supercritical state of carbon dioxide, and carbon dioxide forms the individual nuclei of bubbles that is dispersed in liquid thermoplastic polymkeric substance inside;
5, reduce temperature, pressure relief, nuclei of bubbles is grown up in the liquid thermoplastic polymkeric substance, foams;
6, extrusion molding;
7, foamed products.
In the above-mentioned microporous foam technology, carbon dioxide is to inject through high-tension apparatus, the essential high pressure gas perfusion equipment that is equipped with in the factory, high pressure gas perfusion equipment cost height, simultaneously, the high pressure gas perfusion equipment belongs to high-tension apparatus, equipment has certain danger, there is certain potential safety hazard, need monitors at any time and safeguard, factory's running cost height; The flow of carbon dioxide is wayward, and quality product is difficult to control; In addition, in process of production, carbon dioxide is directly to be poured in the liquid thermoplastic polymer, though at supercritical state carbon dioxide gas very high diffusion is arranged, sneak out in the journey but gasiform carbonic acid gas and liquid thermoplastic polymkeric substance are molten, its specific surface area is little, the molten difficulty of mixing, and molten mixed speed is low, therefore, gaseous carbon dioxide and liquid thermoplastic polymkeric substance be molten to be mixed and to be still the comparison difficulty, and molten mixed effect is relatively poor, and production efficiency is lower.
Summary of the invention:
The objective of the invention is to provides a kind of solid CO 2 supercritical foaming process at the deficiencies in the prior art, this kind technology is simple, do not need high pressure pouring equipment, effectively improve the rate of diffusion and the dissolved efficiency of carbonic acid gas, and it is molten mixed effective, enhance productivity, running cost is low, and production safety is reliable.
For achieving the above object, the present invention is achieved by the following technical solutions: it may further comprise the steps,
A, sodium bicarbonate and citric acid powder are sneaked in the plastic pellet, wherein, the weight ratio of plastic pellet and sodium bicarbonate is 100: 0.5～3, and the weight ratio of plastic pellet and citric acid is 100: 0.25～1.5;
B, pan feeding are sent into above-mentioned plastic pellet in the screw rod of injection moulding machine;
C, fusion, along with the propelling movement of screw rod, plastic pellet is heated and is melt into liquid plastic cement, and wherein, pressure is 30～50Kg/cm
2, temperature is 160 ℃～170 ℃, the time is 3～4 minutes;
D, mixing, the powder of sodium bicarbonate, citric acid is fully mixing through the stirring and the liquid plastic cement of screw rod, the powder of sodium bicarbonate, citric acid and liquid plastic cement thorough mixing, wherein, pressure is 50～160Kg/cm
2, temperature is 165 ℃～175 ℃, the time is 0.5～1.5 minute;
E, foaming, pressure boost, the temperature that increases, sodium bicarbonate and citric acid decomposition discharge carbon dioxide, the carbonic acid gas that discharges is under the supercritical state, and carbonic acid gas spreads rapidly and is dissolved in the liquid plastic cement, and carbonic acid gas and liquid plastic cement change a single phase soln into after forming out-phase solution again, wherein, pressure is 160Kg/cm2～220Kg/cm2, and temperature is 190 ℃～205 ℃, and the time is 0.5～1.5 minute;
F, step-down cooling, the supercritical state of releasing carbon dioxide, carbon dioxide is nucleation in liquid plastic cement, and pressure is 140Kg/cm
2～160Kg/cm
2, temperature is 145 ℃～155 ℃, the time is 0.5～1.5 minute;
G, extrusion molding;
H, product.
Adding in the described plastic pellet has laminar silicic acid nano level polynite powder, and the weight ratio of plastic pellet and the polynite of laminar silicic acid nano level is 100: 0.25～1.5.
The optimum pressure of the smelting process of described C step is 40Kg/cm
2, optimum temps is 165 ℃, Best Times is 3 minutes.
The optimum pressure of the calendering process of described D step is 150Kg/cm
2, optimum temps is 170 ℃, Best Times is 1 minute.
The optimum pressure of the foam process of described E step is 200Kg/cm
2, optimum temps is 200 ℃, Best Times is 1 minute.
From technique scheme as can be seen, the present invention sneaks into a certain proportion of sodium bicarbonate and citric acid powder in plastic pellet (thermoplastics), after plastic pellet is admitted to screw rod, plastic pellet is heated earlier and is melt into liquid state, sodium bicarbonate and citric acid powder then melt and are mixed in the liquid plastic cement, melting of powder and liquid plastic cement is mixed effective, and melt be mixed even, when raising its temperature and pressure again, chemical reaction then takes place in sodium bicarbonate and citric acid powder, and gas splits the carbon dioxide off, the carbon dioxide of this moment is filled in the plastic cement solution, add that carbon dioxide is in supercritical state, therefore, compare with the production technique of present reperfusion mode, the specific surface area that carbon dioxide is dissolved in liquid plastic cement is bigger, its rate of diffusion is faster, and solute effect is better, enhances productivity; Because technology of the present invention do not need high pressure pouring equipment, to produce more safe and reliablely, equipment cost is low; In addition, carbonic acid gas decomposes generation by pulverous sodium bicarbonate, citric acid, by the ratio of control sodium bicarbonate, citric acid, promptly can accurately control the usage quantity of carbonic acid gas, simple and convenient, thus can produce the product that adheres to specification, technology is simple, and the product percent of pass height.In sum, technology of the present invention is simple, does not need high pressure pouring equipment, and molten mixed effective, the usage quantity of carbonic acid gas is easy to control, and effectively improves the rate of diffusion and the dissolved efficiency of carbonic acid gas, enhances productivity, and running cost is low, and production safety is reliable.
Description of drawings:
Accompanying drawing 1 is the FB(flow block) of existing foam process;
Accompanying drawing 2 is the FB(flow block) of foam process of the present invention.
Embodiment:
For further disclosing the present invention, describe below in conjunction with accompanying drawing 2 and specific embodiment.
It may further comprise the steps:
A, sodium bicarbonate, citric acid and laminar silicic acid nano level polynite powder are sneaked in the plastic pellet, and stir.Wherein, plastic pellet is a thermoplastics, and sodium bicarbonate is industrial sodium bicarbonate, and the weight ratio of sodium bicarbonate and plastic pellet is 100: 0.5～3; Citric acid is a nucleator, is used for the formation of inducing gas foam, and simultaneously, citric acid disperses bubble in addition and disperses the effect of micropore, makes it produce more littler nuclei of bubbles in foaming process, and the weight ratio of citric acid and plastic pellet is 100: 0.25～1.5; In the present embodiment, also adding in the described plastic pellet has industrial laminar silicic acid nano level polynite, and the weight ratio of polynite of laminar silicic acid nano level and plastic pellet is 100: 0.25～1.5, and the polynite of laminar silicic acid nano level also is a kind of nucleator.
B, pan feeding in the injection moulding machine feeding port is sent into the screw rod of injection moulding machine, push above-mentioned plastic pellet and stir by screw rods.
C, fusion, propelling movement along with screw rod, plastic pellet is heated and is melt into liquid plastic cement, the temperature and pressure no show sodium bicarbonate in this stage and the decomposition condition of citric acid, sodium bicarbonate, citric acid and laminar silicic acid nano level polynite powder still are present in the liquid plastic cement for pulverulence, in this stage, pressure is 30～50Kg/cm
2, temperature is 160 ℃～170 ℃, the time is 3～4 minutes; Wherein, optimum pressure is 40Kg/cm
2, optimum temps is 165 ℃, Best Times is 3 minutes.
D, mixing, sodium bicarbonate, citric acid and laminar silicic acid nano level polynite powder are mixing through the stirring and the liquid plastic cement of screw rod, sodium bicarbonate, citric acid and the polynite of laminar silicic acid nano level are Powdered, therefore, when sodium bicarbonate, citric acid and laminar silicic acid nano level polynite powder and liquid plastic cement thorough mixing, sodium bicarbonate, citric acid, laminar silicic acid nano level polynite powder can and evenly spread in the liquid plastic cement with liquid plastic cement thorough mixing, not only mix, and mixing rate is fast, melts mixed effective.In this stage, pressure is 50～160Kg/cm
2, temperature is 165 ℃～175 ℃, and the time is 0.5～1.5 minute, and wherein, optimum pressure is 150Kg/cm
2, optimum temps is 170 ℃, Best Times is 1 minute.
E, foaming, pressure boost, the temperature that increases, temperature and pressure in the screw rod reaches sodium bicarbonate and citric acid arrives the condition that decomposition takes place, sodium bicarbonate and citric acid decompose, discharge carbon dioxide, the carbonic acid gas that discharges is under the supercritical state, and carbonic acid gas spreads rapidly and is dissolved in the liquid plastic cement, and carbonic acid gas and liquid plastic cement form out-phase solution and transfer a single phase soln rapidly to.Because sodium bicarbonate and citric acid are evenly dispersed in the plastic cement solution before decomposition very much, carbon dioxide discharges promptly once decomposition and is present in the plastic cement solution very equably, contained by plastic cement solution, the carbonic acid gas of adding this moment is under the supercritical state, therefore, carbonic acid gas can very rapidly be diffused in the liquid plastic cement and fully be dissolved in the liquid plastic cement, and finally forms a single phase soln; In its dissolution process, because its specific surface area is big, therefore, the rate of diffusion of carbonic acid gas is fast, the dissolved efficiency height; In this stage, pressure is 160Kg/cm
2～220Kg/cm
2, temperature is 190 ℃～205 ℃, and the time is 0.5～1.5 minute, and wherein, optimum pressure is 200Kg/cm
2, optimum temps is 200 ℃, Best Times is 1 minute.
F, step-down cooling, the supercritical state of releasing carbon dioxide, carbon dioxide is covered by in liquid plastic cement, and simultaneously, carbon dioxide disperses and nucleation, forms highdensity nuclei of bubbles in liquid plastic cement; Because have citric acid in the plastic cement solution, citric acid is used for the formation of inducing gas foam, makes it produce more littler nuclei of bubbles in foaming process, the product that explained hereafter of the present invention is gone out has better foaming effect; In this stage, pressure is 140Kg/cm
2～160Kg/cm
2, temperature is 145 ℃～155 ℃, the time is 0.5～1.5 minute; Wherein, optimum pressure is 150Kg/cm
2, optimum temps is 150 ℃, Best Times is 1 minute.
G, extrusion molding, pressure and temperature moment releasing, the nuclei of bubbles in the liquid plastic cement expands and enlarges; Owing to have the polynite of laminar silicic acid nano level in the plastic cement solution, the polynite of laminar silicic acid nano level is a kind of nucleator, the polynite of laminar silicic acid nano level can effectively improve the quantity of micropore in foaming process, make it produce more littler nuclei of bubbles in foaming process, nuclei of bubbles is grown into hole in plastics.
H, product.
In the above embodiments, can also use the twin screw injection moulding machine to produce, the mixing effect of twin screw is better than single screw rod, and its molten mixed effect is also better.
The above only is preferred embodiment of the present invention, so all equivalences of doing according to the described structure of patent claim of the present invention, feature and principle change or modify, is included in the patent claim of the present invention.
Claims (5)
1, a kind of solid CO 2 supercritical foaming process, it is characterized in that: it may further comprise the steps,
A, sodium bicarbonate and citric acid powder are sneaked in the plastic pellet, wherein, the weight ratio of plastic pellet and sodium bicarbonate is 100: 0.5～3, and the weight ratio of plastic pellet and citric acid is 100: 0.25～1.5;
B, pan feeding are sent into above-mentioned plastic pellet in the screw rod of injection moulding machine;
C, fusion, along with the propelling movement of screw rod, plastic pellet is heated and is melt into liquid plastic cement, and wherein, pressure is 30～50Kg/cm
2, temperature is 160 ℃～170 ℃, the time is 3～4 minutes;
D, mixing, the powder of sodium bicarbonate, citric acid is fully mixing through the stirring and the liquid plastic cement of screw rod, and the powder of sodium bicarbonate, citric acid and liquid plastic cement fully melt mixed, and wherein, pressure is 50～160Kg/cm
2, temperature is 165 ℃～175 ℃, the time is 0.5～1.5 minute;
E, foaming, pressure boost, the temperature that increases, sodium bicarbonate and citric acid decomposition discharge carbon dioxide, the carbonic acid gas that discharges is under the supercritical state, carbonic acid gas spreads rapidly and is dissolved in the liquid plastic cement, carbonic acid gas and liquid plastic cement transfer a single phase soln to after forming out-phase solution again, and wherein, pressure is 160Kg/cm
2～220Kg/cm
2, temperature is 190 ℃～205 ℃, the time is 0.5～1.5 minute;
F, step-down cooling, the supercritical state of releasing carbon dioxide, carbon dioxide is nucleation in liquid plastic cement, and pressure is 140Kg/cm
2～160Kg/cm
2, temperature is 145 ℃～155 ℃, the time is 0.5～1.5 minute;
G, extrusion molding;
H, product.
2, a kind of solid CO 2 supercritical foaming process according to claim 1, it is characterized in that: adding in the described plastic pellet has laminar silicic acid nano level polynite powder, and the weight ratio of plastic pellet and the polynite of laminar silicic acid nano level is 100: 0.25～1.5.
3, a kind of solid CO 2 supercritical foaming process according to claim 1 is characterized in that: the optimum pressure of the smelting process of described C step is 40Kg/cm
2, optimum temps is 165 ℃, Best Times is 3 minutes.
4, a kind of solid CO 2 supercritical foaming process according to claim 1 is characterized in that: the optimum pressure of the calendering process of described D step is 150Kg/cm
2, optimum temps is 170 ℃, Best Times is 1 minute.
5, a kind of solid CO 2 supercritical foaming process according to claim 1 is characterized in that: the optimum pressure of the foam process of described E step is 200Kg/cm
2, optimum temps is 200 ℃, Best Times is 1 minute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710028410A CN100588677C (en) | 2007-06-05 | 2007-06-05 | Solid CO2 supercritical foaming process |
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|---|---|---|---|
| CN200710028410A CN100588677C (en) | 2007-06-05 | 2007-06-05 | Solid CO2 supercritical foaming process |
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| CN101089033A true CN101089033A (en) | 2007-12-19 |
| CN100588677C CN100588677C (en) | 2010-02-10 |
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| CN200710028410A Expired - Fee Related CN100588677C (en) | 2007-06-05 | 2007-06-05 | Solid CO2 supercritical foaming process |
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Owner name: DONGGUAN YIDONG PLASTIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: GELING PLASTIC CO., LTD., DONGQUAN Effective date: 20100921 |
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Free format text: CORRECT: ADDRESS; FROM: 523962 DONGGUAN GELING PLASTIC CO., LTD., XINZHUANG, SHANMEI, HOUJIE TOWN, DONGGUAN CITY, GUANGDONG PROVINCE TO: 523000 DONGGUAN YIDONG PLASTIC TECHNOLOGY CO., LTD., INDUSTRIAL ZONE, TANGXIA VILLAGE, GAOBU TOWN, DONGGUAN CITY, GUANGDONG PROVINCE |
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Effective date of registration: 20100921 Address after: Dongguan City, Guangdong province 523000 Dongguan Gaopu town Tangxia Village Industrial Zone, Dong Yi Alwayseal Technology Ltd Patentee after: Dongguan Fengdong Plastic Technology Co.,Ltd. Address before: 523962, Houjie Town, Houjie Town, Guangdong City, Dongguan province Dongguan Ma Ling plastic Co., Ltd. Patentee before: Dongguan Geling Plastic Co., Ltd. |
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| CP03 | Change of name, title or address |
Address after: At the junction of 516123 Guangdong city of Huizhou province Boluo Yuanzhou Wo Village Yuanzhou road and garden road. Patentee after: DONGGUAN YIDONG PLASTIC TECHNOLOGY CO., LTD. Address before: Dongguan City, Guangdong province 523000 Dongguan Gaopu town Tangxia Village Industrial Zone, Dong Yi Alwayseal Technology Ltd Patentee before: Dongguan Fengdong Plastic Technology Co.,Ltd. |
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Addressee: Wang Jianping Document name: Notification of Passing Examination on Formalities |
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