CN101381496B - Polystyrol material producing method and food package material - Google Patents

Polystyrol material producing method and food package material Download PDF

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Publication number
CN101381496B
CN101381496B CN2008101726388A CN200810172638A CN101381496B CN 101381496 B CN101381496 B CN 101381496B CN 2008101726388 A CN2008101726388 A CN 2008101726388A CN 200810172638 A CN200810172638 A CN 200810172638A CN 101381496 B CN101381496 B CN 101381496B
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China
Prior art keywords
polystyrene
surface tension
low surface
food
sheet
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CN101381496A (en
Inventor
郭利春
白雪
韩永生
刘卫星
胡新宇
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Inner Mongolia Mengniu Dairy Group Co Ltd
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Inner Mongolia Mengniu Dairy Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
    • B29C48/9185—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling in the direction of the stream of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/04—Particle-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92923—Calibration, after-treatment or cooling zone

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention relates to a polystyrene material with low surface tension, which is prepared by the following raw materials in weight portion: 1,000 portions of polystyrene, 5 to 25 portions of dimethyl silicone polymer and 5 to 40 portions of polytetrafluoroethylene. The polystyrene material with low surface tension introduces two adequate surface auxiliary agents with low surface tension value in a polystyrene system by means of blending; and the two surface auxiliary agents introduced are food level, and have absolute safety and low cost. The invention also provides a method for preparing raw materials of the polystyrene material with low surface tension, relates to a method for producing the polystyrene material with low surface tension, in particular to a method for producing a polystyrene sheet with low surface tension, and also relates to a packaging material for food which is processed by the polystyrene sheet with low surface tension. The methods can reduce the surface tensionvalue of the polystyrene material and then reduce the adherence degree of fermented milk on the surface of the polystyrene material, and also has the advantage of simple and convenient operation method.

Description

A kind of preparation method of polystyrene material and packaging material for food thereof
Technical field
The present invention relates to a kind of preparation method of polystyrol material with low surface tension, also relate to a kind of packaging material for food of utilizing low surface tension polystyrene sheet material to process.
Background technology
At present, commercially available yoghourt adopts plastic packaging containers usually, for example, and plastic cup, plastics casing, Plastic Bottle or plastics pot etc.When opening sour milk or drinking sour milk, have some sour milks usually and can be attached on the above-mentioned plastic packaging containers wall and can't pour out, this is a kind of waste for consumers, solves this type of problem so be badly in need of seeking a kind of effective way.
The wrapping material that are generally used for sour milk are polystyrene, from the interfacial chemistry angle analysis, sour milk is attached on the surface of polystyrene material, be because sour milk sticks wetting polystyrene material surface, realize that sour milk is not attached on material surface, should make between sour milk and the polystyrene material surface finally to reach non-wetted effect.
The surface tension value of polystyrene material is 33mN/m, under the situation that does not change the fermented yogurt physico-chemical property, we can reach the effect of nonwetting its material surface of sour milk by the surface tension value that reduces polystyrene packing material, thereby make sour milk not be attached on the wrapping material internal surface.
Fluorine, two kinds of elements of silicon can reduce the surface energy of material effectively in the enrichment of material surface, increase the contact angle between material and the contact liq, the hydrophobic and lyophobic property of strongthener, non-stick property etc.
Polarize owing to the C-F key is difficult in the fluoropolymer, Van der Waals force between the C-F key is littler than c h bond, surface tension is the embodiment of Intermolecular Forces, so the critical surface tension of fluoropolymer can effectively reduce the surface tension value of polystyrene system far below hydrocarbon polymer.Ptfe surface tension force in the fluoropolymer is 18.6mN/m, and anti-adhesion performance is better, uses comparative maturity, but costs an arm and a leg.
Silicon-containing polymer has good reduction material surface tensile ability too, it is the low surface energy polymeric that removes fluoropolymer beyond the region of objective existence the best, dimethyl silicone polymer surface tension force in the silicon-containing polymer is 21mN/m, is lower a kind of of surface tension in the silicon-containing polymer, and price comparison is cheap.
Summary of the invention
The technical problem that the present invention will solve provides a kind of preparation method of polystyrol material with low surface tension, is beneficial to obtain the polystyrene stuff and other stuff of this low surface tension.
Another technical problem that the present invention will solve provides a kind of method of producing polystyrol material with low surface tension, is beneficial to obtain the polystyrene material particle of this low surface tension.
Another technical problem that the present invention will solve provides a kind of method of producing low surface tension polystyrene sheet material, is beneficial to obtain a kind of polystyrene sheet material of low surface tension.
Another technical problem that the present invention will solve provides a kind of packaging material for food of utilizing low surface tension polystyrene sheet material to process, reducing or to avoid problem noted earlier, and provides a kind of wrapping material that can be used for the safety of food product pack.
For solving the problems of the technologies described above, the invention provides a kind of preparation method of polystyrol material with low surface tension, comprise the steps:
Take by weighing weight part and be 1000 polystyrene raw material particle, weight part is the polydimethylsiloxane of 5-25, and weight part is the tetrafluoroethylene raw material of 5-40;
Described polystyrene raw material particle is added in the high speed mixer, and the start batch mixing is slowly poured described polydimethylsiloxane in the described polystyrene raw material again, mixes 2-20min;
Described tetrafluoroethylene divided to pour into for 3-5 time in the described high speed mixer continue to mix 3-30min, the polystyrene stuff and other stuff of be uniformly mixed described polydimethylsiloxane and described tetrafluoroethylene.
Further, the present invention also provides a kind of method that adopts above-mentioned stuff and other stuff to produce polystyrol material with low surface tension,
Comprise the steps:
Start preheating twin screw extruder;
Set each heating zone temperature: temperature range 30-240 ℃ of forcing machine, 30-50 ℃ of feeding zone temperature, body temperature 100-240 ℃, head temperature 180-240 ℃;
The setting screw speed is 50-150r/min;
With uniform mixing the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agent polydimethylsiloxanes and tetrafluoroethylene add in the twin screw extruder hopper;
The polystyrene line material of extruding is cooled off through 10-40 ℃ of tank.
Use dicing machine that refrigerative polystyrene line material is cut into particle.
Low surface tension polystyrene raw material particle is packed.
Further, the present invention also provides a kind of method that adopts the polystyrol material with low surface tension production low surface tension polystyrene sheet material of preceding method preparation,
Comprise the steps:
Start preheating plastics sheet forcing machine;
Set each heating zone temperature: temperature range 130-240 ℃ of plastics sheet forcing machine, barrel temperature 130-240 ℃, die head temperature 160-240 ℃;
The temperature range of setting cooling roller is 40-60 ℃;
Aforementioned polystyrol material with low surface tension is added in the plastics sheet forcing machine hopper;
The die orifice extrusion sheet;
Three roller cooling and shapings;
Cut edge;
Rolling.
Further, the present invention also provides a kind of packaging material for food, and the low surface tension polystyrene sheet material thermoforming of adopting aforesaid method to obtain processes, and described packaging material for food is processed into the liquid food packing container, especially a kind of sour milk packaging vessel.
The emphasis of the technical problem to be solved in the present invention is the surface tension that reduces polystyrene material, provide simultaneously that a kind of cost is low, the production method of the polystyrene material of the low surface tension being convenient to operate, in addition, owing to relate to the situation that the polystyrene material of this low surface tension is applied to the food product pack field, therefore, need also to consider that material has the problem of toxicological harmless to human body.
According to technology solution provided by the present invention, the present invention adopts the mode of blend to introduce the surperficial auxiliary agent of two kinds of an amount of low surface tension values in polystyrene material in the polystyrene system.Be characterized in: the surperficial auxiliary agent of two kinds of low surface tension values of introducing has certain synergistic effect; The surperficial auxiliary agent of two kinds of low surface tension values introducing is a food grade, has absolute security; Two kinds of surperficial auxiliary agents are respectively food grade polydimethylsiloxane and tetrafluoroethylene; The polystyrene material surface tension significantly reduces; More much lower than the simple tetrafluoroethylene cost that uses.
In addition, for obtaining a kind of like this polystyrene material of low surface tension, the present invention also provides raw material outfit and blending means, the working method of material and the working method of sheet material that helps reducing surface tension value.These methods be except reducing the surface tension value of polystyrene material, thereby reduce sour milk outside the effect of sticking degree on polystyrene material surface, also have the easy advantage of working method.
Embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast description of drawings the specific embodiment of the present invention.Be necessary to be pointed out that at this present embodiment only is used for that the present invention will be described, can not be interpreted as limiting the scope of the invention.
Embodiment 1
Present embodiment provides a kind of polystyrene material and production method thereof with low surface tension.
1. the composition of raw material:
This polystyrol material with low surface tension is formed by following feedstock production:
Polystyrene: 1000Kg
Polydimethylsiloxane: 8Kg
Tetrafluoroethylene: 10Kg.
Wherein, two kinds of surperficial auxiliary agents in polystyrene raw material, have been added: polydimethylsiloxane and tetrafluoroethylene.
Every physical and chemical index of the polydimethylsiloxane auxiliary agent that present embodiment adopted is as follows:
Project Unit Index
Outward appearance / Colourless transparent liquid does not have visible impurity
Kinematic viscosity mm 2/s(25℃) 500
Refractive index (25℃) 1.4016
Flash-point ℃ 318
Fugitive constituent 150℃，3h，％ 0.9015
Arsenic PPM ≤1
Heavy metal (in Pb) PPM ≤1
The catalyst residue amount PPM ≤0.1
Surface tension mN/m 21
Every physical and chemical index of the tetrafluoroethylene auxiliary agent that present embodiment adopted is as follows:
Project Unit Index
Outward appearance / White fine powder, tasteless
Density kg/m 3 250-350
Fusing point ℃ 325-330
Particle diameter μm ≤10
Surface tension mN/m 18.6
2. raw material outfit method
Take by weighing required polystyrene raw material particle, polydimethylsiloxane and tetrafluoroethylene by weight.Polystyrene raw material is added in the high speed mixer (this machinery of CBEL-25 vertical mixer river), the start batch mixing, slowly pour into polydimethylsiloxane in the polystyrene raw material again, mix 5min, after treating that two kinds of materials mix, the tetrafluoroethylene powder divided pour in the mixer for 3 times, continue to mix 7min, make the polystyrene raw material thorough mixing of polytetrafluorethylepowder powder and uniform mixing polydimethylsiloxane with the polystyrene raw material of uniform mixing polydimethylsiloxane.Discharging, the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents that obtained uniform mixing.
3. the production method of polystyrol material with low surface tension
(1) twin screw extruder start (emerging field, the TSE75A homophase parallel double-screw extruder sky and water) preheating;
(2) set each heating zone temperature of forcing machine, extruder temperature is set as follows:
1 district 2 districts 3 districts 4 districts 5 districts 6 districts 7 districts 8 districts Head
80℃ 140℃ 175℃ 175℃ 180℃ 190℃ 195℃ 195℃ 190℃
(3) setting screw speed is 100r/min;
(4) with uniform mixing the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents add in the twin screw extruder hopper;
(5) the polystyrene line material of extruding is cooled off through 20-30 ℃ of tank;
(6) use dicing machine that refrigerative polystyrene line material is cut into particle, grain machine rotating speed 500r/min;
(7) low surface tension polystyrene raw material particle is packed.
4. the production method of low surface tension polystyrene sheet material
(1) plastics sheet forcing machine (the WJP90P-1000 Shantou City reaches city machinery) start preheating;
(2) set each heating zone temperature of plastics sheet forcing machine.Specifically be provided with as follows:
1 district 2 districts 3 districts 4 districts 5 districts 6 districts 7 districts Die head
150℃ 170℃ 190℃ 196℃ 196℃ 200℃ 220℃ 220℃
(3) the main-machine screw rotating speed is 40r/min;
(4) spacing of regulating between three cooling rollers is 2mm, and three roller rotating speeds are 25r/min, guarantees that the thickness of sheet material is even.The temperature range of cooling roller is 40-50 ℃;
(5) distance of regulating between the cutting knife is 400mm, guarantees that the fabric width deviation of sheet material is ± 1mm;
(6) the mixing polystyrene particle that will make on last stage adds in the plastics sheet forcing machine hopper;
(7) die orifice extrusion sheet;
(8) three roller cooling and shapings;
(9) cut edge;
(10) rolling;
(11) packing.
5. detected result
Get the aforementioned polystyrene sheet material, detect its surface tension.Material surface is opened detection method and test fluid configuration: with reference to GB/T 14216-93 plastic film and sheet wetting tension test method.
The surface tension detected result of the sheet material that is obtained after adding surperficial additive modification is: 27.3mN/m.
Adopt thermoforming to be processed into food container above-mentioned sheet material, the sour milk of packing in container is put to 15 ℃, adopts the unified method of toppling over, and with the sour milk wall built-up rate of toppling in the cup of back sticking wall of cup, cup film degree is weighed.Topple over method: after raising the sour milk epiphragma, cup is tilted to 90 ° of 30s, the sour milk cup is tilted to 180 ° of 30s again and finish, detected result is that natural yogurt wall built-up rate descends 40.6%.
Embodiment 2
Present embodiment provides another kind of the have polystyrene material and the production method thereof of low surface tension.
1. the composition of raw material:
This polystyrol material with low surface tension is formed by following feedstock production:
Polystyrene: 1000Kg
Polydimethylsiloxane: 20Kg
Tetrafluoroethylene: 30Kg.
Wherein, two kinds of surperficial auxiliary agents in polystyrene raw material, have been added: polydimethylsiloxane and tetrafluoroethylene.
Every physical and chemical index of the polydimethylsiloxane auxiliary agent that present embodiment adopted is as follows:
Project Unit Index
Outward appearance / Colourless transparent liquid does not have visible impurity
Kinematic viscosity mm 2/s(25℃) 500
Refractive index (25℃) 1.4016
Flash-point ℃ 318
Fugitive constituent 150℃，3h，％ 0.9015
Arsenic PPM ≤1
Heavy metal (in Pb) PPM ≤1
The catalyst residue amount PPM ≤0.1
Surface tension mN/m 21
Every physical and chemical index of the tetrafluoroethylene auxiliary agent that present embodiment adopted is as follows:
Project Unit Index
Outward appearance / White fine powder, tasteless
Density kg/m 3 250-350
Fusing point ℃ 325-330
Particle diameter μm ≤10
Surface tension mN/m 18.6
2. raw material outfit method
Take by weighing required polystyrene raw material particle, polydimethylsiloxane and tetrafluoroethylene by weight.Polystyrene raw material is added in the high speed mixer (this machinery of CBEL-25 vertical mixer river), the start batch mixing, slowly pour into polydimethylsiloxane in the polystyrene raw material again, mix 5min, after treating that two kinds of materials mix, the tetrafluoroethylene material divided pour in the mixer for 4 times, continue to mix 10min, make the polystyrene raw material thorough mixing of polytetrafluorethylepowder powder and uniform mixing polydimethylsiloxane with the polystyrene raw material of uniform mixing polydimethylsiloxane.Discharging, the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents that obtained uniform mixing.
3. the production method of polystyrol material with low surface tension
(1) twin screw extruder start (emerging field, the homophase parallel double-screw extruder TSE75A sky and water) preheating;
(2) set each heating zone temperature of forcing machine, extruder temperature is set as follows:
1 district 2 districts 3 districts 4 districts 5 districts 6 districts 7 districts 8 districts Head
80℃ 140℃ 180℃ 180℃ 195℃ 195℃ 200℃ 200℃ 195℃
(3) setting screw speed is 110-120r/min.
(4) with uniform mixing the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents add in the twin screw extruder hopper.
(5) the polystyrene line material of extruding is cooled off through 20-30 ℃ of tank;
(6) use dicing machine that refrigerative polystyrene line material is cut into particle, grain machine rotating speed 500r/min;
(7) low surface tension polystyrene raw material particle is packed.
4. the production method of low surface tension polystyrene sheet material
(1) plastics sheet forcing machine (the WJP90P-1000 Shantou City reaches city machinery) start preheating;
(2) set each heating zone temperature of plastics sheet forcing machine, specifically be provided with as follows:
1 district 2 districts 3 districts 4 districts 5 districts 6 districts 7 districts Die head
150℃ 170℃ 190℃ 196℃ 196℃ 200℃ 220℃ 220℃
(3) the main-machine screw rotating speed is 40r/min;
(4) spacing of regulating between three cooling rollers is 2mm, and the roller rotating speed is 25r/min, guarantees that the thickness of sheet material is even.The temperature range of cooling roller is 40-50 ℃;
(5) distance of regulating between the cutting knife is 400mm, and the fabric width deviation of card sheet material is ± 1mm;
(6) the mixing polystyrene particle that will make on last stage adds in the plastics sheet forcing machine hopper;
(7) die orifice extrusion sheet;
(8) three roller cooling and shapings;
(9) cut edge;
(10) rolling;
(11) packing.
5. detected result
Get the aforementioned polystyrene sheet material, detect its surface tension.Material surface is opened detection method and test fluid configuration: with reference to GB/T 14216-93 plastic film and sheet wetting tension test method.
The surface tension detected result of the sheet material that is obtained after adding surperficial additive modification is: 25.4mN/m.
Adopt thermoforming to be processed into food container above-mentioned sheet material, the sour milk of packing in container is put to 15 ℃, adopts the unified method of toppling over, and with the sour milk wall built-up rate of toppling in the cup of back sticking wall of cup, cup film degree is weighed.Topple over method: after raising the sour milk epiphragma, cup is tilted to 90 ° of 30s, the sour milk cup is tilted to 180 ° of 30s again and finish, detected result is that natural yogurt wall built-up rate descends 45.6%
Embodiment 3
Present embodiment provides another kind of the have polystyrene material and the production method thereof of low surface tension.
1. the composition of raw material:
This polystyrol material with low surface tension is formed by following feedstock production:
Polystyrene: 1000Kg
Polydimethylsiloxane: 25Kg
Tetrafluoroethylene: 40Kg.
Wherein, added two kinds of surperficial auxiliary agents in polystyrene raw material: polydimethylsiloxane and tetrafluoroethylene, every physical and chemical index of polydimethylsiloxane that is adopted and tetrafluoroethylene auxiliary agent is identical with embodiment 2 with embodiment 1.
2. raw material outfit method
Take by weighing required polystyrene raw material particle, polydimethylsiloxane and tetrafluoroethylene by weight.Polystyrene raw material is added in the high speed mixer (this machinery of CBEL-25 vertical mixer river), the start batch mixing, slowly pour into polydimethylsiloxane in the polystyrene raw material again, mix 20min, after treating that two kinds of materials mix, the tetrafluoroethylene powder divided pour in the mixer for 5 times, continue to mix 30min, make the polystyrene raw material thorough mixing of polytetrafluorethylepowder powder and uniform mixing polydimethylsiloxane with the polystyrene raw material of uniform mixing polydimethylsiloxane.Discharging, the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents that obtained uniform mixing.
3. the production method of polystyrol material with low surface tension
(1) twin screw extruder start (emerging field, the TSE75A homophase parallel double-screw extruder sky and water) preheating;
(2) set each heating zone temperature of forcing machine, temperature range 30-240 ℃, 30-50 ℃ of feeding zone temperature, body temperature 100-240 ℃, head temperature 180-240 ℃;
(3) setting screw speed is 150r/min;
(4) with uniform mixing the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents add in the twin screw extruder hopper;
(5) the polystyrene line material of extruding is cooled off through 10-40 ℃ of tank;
(6) use dicing machine that refrigerative polystyrene line material is cut into particle, grain machine rotating speed 500r/min;
(7) low surface tension polystyrene raw material particle is packed.
4. the production method of low surface tension polystyrene sheet material
(1) plastics sheet forcing machine (the WJP90P-1000 Shantou City reaches city machinery) start preheating;
(2) set each heating zone temperature: temperature range 130-240 ℃ of plastics sheet forcing machine, barrel temperature 130-240 ℃, die head temperature 160-240 ℃.
(3) the main-machine screw rotating speed is 40r/min;
(4) spacing of regulating between three cooling rollers is 2mm, and three roller rotating speeds are 25r/min, guarantees that the thickness of sheet material is even.The temperature range of cooling roller is 40-60 ℃;
(5) distance of regulating between the cutting knife is 400mm, guarantees that the fabric width deviation of sheet material is ± 1mm;
(6) the mixing polystyrene particle that will make on last stage adds in the plastics sheet forcing machine hopper;
(7) die orifice extrusion sheet;
(8) three roller cooling and shapings;
(9) cut edge;
(10) rolling;
(11) packing.
5. detected result
Get the aforementioned polystyrene sheet material, detect its surface tension.Material surface is opened detection method and test fluid configuration: with reference to GB/T 14216-93 plastic film and sheet wetting tension test method.
The surface tension detected result of the sheet material that is obtained after adding surperficial additive modification is: 22.6mN/m, and original polystyrene sheet material surface tension is 33mN/m, has reduced 10.4mN/m.
Adopt thermoforming to be processed into food container above-mentioned sheet material, the sour milk of packing in container is put to 15 ℃, adopts the unified method of toppling over, and with the sour milk wall built-up rate of toppling in the cup of back sticking wall of cup, cup film degree is weighed.Topple over method: after raising the sour milk epiphragma, cup is tilted to 90 ° of 30s, the sour milk cup is tilted to 180 ° of 30s again and finish, detected result is that natural yogurt wall built-up rate descends 50.1%, and fruit-flavoured yogurt wall built-up rate has descended 48.8%.
Present embodiment this material modified can also be used on the wrapping material of the higher food of other viscositys, for example jam.
Embodiment 4
Present embodiment provides another kind of the have polystyrene material and the production method thereof of low surface tension.
1. the composition of raw material:
This polystyrol material with low surface tension is formed by following feedstock production:
Polystyrene: 1000Kg
Polydimethylsiloxane: 5Kg
Tetrafluoroethylene: 5Kg.
Wherein, added two kinds of surperficial auxiliary agents in polystyrene raw material: polydimethylsiloxane and tetrafluoroethylene, every physical and chemical index of polydimethylsiloxane that is adopted and tetrafluoroethylene auxiliary agent is identical with embodiment 2 with embodiment 1.
2. raw material outfit method
Take by weighing required polystyrene raw material particle, polydimethylsiloxane and tetrafluoroethylene by weight.Polystyrene raw material is added in the high speed mixer (this machinery of CBEL-25 vertical mixer river), the start batch mixing, slowly pour into polydimethylsiloxane in the polystyrene raw material again, mix 2min, after treating that two kinds of materials mix, the tetrafluoroethylene powder divided pour in the mixer for 3 times, continue to mix 3min, make the polystyrene raw material thorough mixing of polytetrafluorethylepowder powder and uniform mixing polydimethylsiloxane with the polystyrene raw material of uniform mixing polydimethylsiloxane.Discharging, the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents that obtained uniform mixing.
3. the production method of polystyrol material with low surface tension
(1) twin screw extruder start (emerging field, the TSE75A homophase parallel double-screw extruder sky and water) preheating;
(2) set each heating zone temperature of forcing machine, temperature range 30-240 ℃, 30-50 ℃ of feeding zone temperature, body temperature 100-240 ℃, head temperature 180-240 ℃;
(3) setting screw speed is 50r/min;
(4) with uniform mixing the polystyrene stuff and other stuff of two kinds of surperficial auxiliary agents add in the twin screw extruder hopper;
(5) the polystyrene line material of extruding is cooled off through 10-40 ℃ of tank;
(6) use dicing machine that refrigerative polystyrene line material is cut into particle, grain machine rotating speed 500r/min;
(7) low surface tension polystyrene raw material particle is packed.
4. the production method of low surface tension polystyrene sheet material
(1) plastics sheet forcing machine (the WJP90P-1000 Shantou City reaches city machinery) start preheating;
(2) set each heating zone temperature: temperature range 130-240 ℃ of plastics sheet forcing machine, barrel temperature 130-240 ℃, die head temperature 160-240 ℃.
(3) the main-machine screw rotating speed is 40r/min;
(4) spacing of regulating between three cooling rollers is 2mm, and three roller rotating speeds are 25r/min, guarantees that the thickness of sheet material is even.The temperature range of cooling roller is 40-60 ℃;
(5) distance of regulating between the cutting knife is 400mm, guarantees that the fabric width deviation of sheet material is ± 1mm;
(6) the mixing polystyrene particle that will make on last stage adds in the plastics sheet forcing machine hopper;
(7) die orifice extrusion sheet;
(8) three roller cooling and shapings;
(9) cut edge;
(10) rolling;
(11) packing.
5. detected result
Get the aforementioned polystyrene sheet material, detect its surface tension.Material surface is opened detection method and test fluid configuration: with reference to GB/T 14216-93 plastic film and sheet wetting tension test method.
The surface tension detected result of the sheet material that is obtained after adding surperficial additive modification is: 28.6mN/m, and original polystyrene sheet material surface tension is 33mN/m.
Adopt thermoforming to be processed into food container above-mentioned sheet material, the sour milk of packing in container is put to 15 ℃, adopts the unified method of toppling over, and with the sour milk wall built-up rate of toppling in the cup of back sticking wall of cup, cup film degree is weighed.Topple over method: after raising the sour milk epiphragma, cup is tilted to 90 ° of 30s, the sour milk cup is tilted to 180 ° of 30s again and finish, detected result is that natural yogurt wall built-up rate descends 40.1%, and fruit-flavoured yogurt wall built-up rate has descended 40.8%.
Present embodiment this material modified can also be used on the wrapping material of the higher food of other viscositys, for example jam.
The above only is the schematic embodiment of the present invention, is not in order to limit scope of the present invention.Any those skilled in the art, equivalent variations, the modification of being done under the prerequisite that does not break away from design of the present invention and principle and combining all should belong to the scope of protection of the invention.

Claims (8)

1. the preparation method of a polystyrol material with low surface tension comprises the steps:
Take by weighing weight part and be 1000 polystyrene raw material particle, weight part is the polydimethylsiloxane of 5-25, and weight part is the tetrafluoroethylene raw material of 5-40;
Described polystyrene raw material particle is added in the high speed mixer, and the start batch mixing is slowly poured described polydimethylsiloxane in the described polystyrene raw material again, mixes 2-20min;
Described tetrafluoroethylene divided to pour into for 3-5 time in the described high speed mixer continue to mix 3-30min, the polystyrene stuff and other stuff of be uniformly mixed described polydimethylsiloxane and described tetrafluoroethylene.
2. the preparation method described in claim 1 further comprises the steps:
Start preheating twin screw extruder;
Set each heating zone temperature: temperature range 30-240 of described twin screw extruder ℃, 30-50 ℃ of feeding zone temperature, body temperature 100-240 ℃, head temperature 180-240 ℃;
Setting described twin screw extruder screw speed is 50-150r/min;
Described polystyrene stuff and other stuff is added in the described twin screw extruder hopper;
The polystyrene line material of extruding is cooled off through 10-40 ℃ of tank.
3. preparation method as claimed in claim 2 further comprises the steps:
Use dicing machine that the described polystyrene line of refrigerative material is cut into particle, obtain the polystyrol material with low surface tension particle.
4. preparation method as claimed in claim 3 further comprises the steps:
Start preheating plastics sheet forcing machine;
Set each heating zone temperature: temperature range 130-240 of described plastics sheet forcing machine ℃, barrel temperature 130-240 ℃, die head temperature 160-240 ℃;
The temperature range of setting cooling roller is 40-60 ℃;
Described polystyrol material with low surface tension particle is added in the described plastics sheet forcing machine hopper;
The die orifice extrusion sheet;
Three roller cooling and shapings;
Cut edge;
Rolling obtains low surface tension polystyrene sheet material.
5. a packaging material for food adopts the described low surface tension polystyrene sheet material of preparation method's acquisition as claimed in claim 4 to process.
6. packaging material for food as claimed in claim 5, described packaging material for food is processed by the thermoforming of described low surface tension polystyrene sheet material.
7. as claim 5 or 6 described packaging materials for food, described packaging material for food is processed into the liquid food packing container.
8. packaging material for food as claimed in claim 7, described packaging material for food is processed into the sour milk packaging vessel.
CN2008101726388A 2008-11-06 2008-11-06 Polystyrol material producing method and food package material Active CN101381496B (en)

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