JPH05502904A - Method for producing heat insulating foam plastic material and blowing agent used in this method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Method for producing heat insulating foam plastic material and blowing agent used in this method Technical field The present invention involves foaming a plastic material or plastic precursor material with a foaming agent. A method of producing an insulating foam plastic material by and the use of mixtures of krypton and xenon as blowing agents. and a heat insulating foaming agent produced by the above h-method.

Background technology Foamed plastic insulation (- foamed with a blowing agent that provides a gas-filled cell structure) The manufacture of plastic insulation materials is well known in the art. For insulation In foamed plastics, the solid phase is often made from polyester, The gas phase, i.e. the blowing agent, is a chlorofluorocarbon (CFC substance), for example!・ Lichlorofluoromethane (CFCII). Because of their low thermal conductivity, CFC materials provide foamed plastics suitable for thermal insulation. In addition to this, these has a suitably low boiling point, which gives an advantage to the production process; The material is a solid plastic material that is chemically inert and safe in the environment of use. It is fixed. However, the use of the above CFC substances has the disadvantage of destroying the environment. Obstructed by points. In recent years, when exposed to ultraviolet light, other stable CFC substances or decomposes in the atmosphere, releasing halogens that destroy the ozone layer This potential problem has come to light. Therefore, it satisfies the wishes of environmentally sensitive consumers. and regarding any legal restrictions, prohibitions or anticipated future higher refining requirements. Use other insulating toys that do not contain harmful halogen-containing blowing agents to prevent problems. The need for this is increasing.

At least one hydrogen atom in addition to the halogen atoms to replace the above substances. It has been proposed to use similar materials containing molecules, such as HCF C materials. the above These substances are more unstable and therefore only a smaller amount of energy enters the atmosphere. It differs from conventional CFC materials in that it is predicted that the 1～Kashi, Kitaki Decomposition products of substances or other environmental problems, such as hydrochloric acid and hydrofluoric acid rain generated It is predicted that the Additionally, the production of HCFC materials generally involves the production of CFC materials. It is predicted that the construction will be more expensive.

The air bubbles on the insulation foam plastic side account for most of the volume, so the holes in the air bubbles The heat transfer that takes place through the gases present contributes significantly to the overall thermal conductivity of the insulation material. and the above contribution is customarily approximately equal to the thermal conductivity when filled with air bubbles or CFCII. occupies half. Therefore, it is important to produce foamed plastic materials with good thermal insulation ability. In this case, the gas itself present in the bubbles has a low thermal conductivity.

Detailed description of the invention The purpose of the present invention is to replace the conventionally used environmentally harmful CFC materials. Use other blowing agents that can Avoids flame hazards and discomfort during manufacturing (-70, but still provides good insulation properties) An object of the present invention is to provide a method for producing a heat-insulating foamed plastic material.

This purpose is to produce plastic materials or plastic precursors (or materials) with blowing agents. In producing insulating foam plastic materials by foaming, and xenon at least partially as a blowing agent. This is achieved by the first method.

The elements crypto and xenon and mixtures thereof are well known. example For example, C.R.C. Handbook of Chemistry Zix (CRC Handbook of Chemistry and Phy sics), 70th edition, 1989-1990. ．． B-22, B-41, F, -2, E-3 and E-13 to E-16 pages.

Kirk Othmer, “Ennoclopedia of Encyclopedia of Chemical Technology) J, 3rd edition, 1982, Volume 12, 249 = 25 5 and 264-268 Peno and Talented One Alb 1/Hi 1 Neimura - (Otto-, A1.brecht Neumol, 1er), "Length Chemie-Lexikon (ROmpps Chemie-Lexikon) J, 8th edition, Volume 3, pages 2262 and Volume 6, pages 4658 and 4659 reference. The elements are not listed as non-toxic and they have low thermal conductivity. It seems to be that. From the table in the handbook above, the above thermal conductivity is I.lichlorofluor The thermal conductivity is thought to be similar to that of oro hydrocarbons.

Therefore, krypone and xenon are candidates for substitutes for CFC gas. death However, a person skilled in the art would know that the market prices of RIJ boutons and xenon, respectively, are Many would find these too expensive to use on a large industrial scale.

However, the high market price is due to the respective purity of krypton and xenon. , which is currently required for conventional technical applications. Most of the price is like this This is due to the difficulty of separating the sea urchin club 1 hen and xenon from each other. but , krypton and xenon both have the required low thermal conductivity, so No expensive separation of IJ particles and xenon is required. On the contrary, A significantly large amount of the second gas can be used without significant deterioration in thermal conductivity. Acceptable in mixtures.

Therefore, parts containing high concentrations of krypton and xenon recovered from atmospheric air For example, a high concentration of Kr-Xe crude can be used directly; Kuosmar [Encyclopedia of Chemical Technology], 3rd edition , 1982. It is described in Volume 12, page 267.

Thermal conductivities of mixtures of more gases are usually calculated by interpolating the thermal conductivities of each component. Thermal conductivity is lower than that of Is this the mixture of xenon and krypton used? This is also why this mixture does not require a particularly high degree of purity. Conveniently used in combination with conventional environmentally acceptable blowing agents, yet Obtain significantly improved low thermal conductivity compared to environmentally acceptable blowing agents This is the reason why I come.

The present invention also provides a blowing agent used by the above method, wherein the blowing agent is The present invention provides a blowing agent comprising a mixture of krypton and krypton.

The present invention also relates to gas defined in the plastic matrix produced by the method of the present invention. It relates to an insulating foamed plastic material with gas filling the filling cells.

The advantages of using a mixture of krypton and xenon as a blowing agent are manifold.

These are thus similar in thermal conductivity to trichlorofluoromethane (CFCII). It has a low degree of thermal conductivity. In contrast to CFC substances, herein referred to as KX gas Krypton and xenon are naturally occurring substances that are not chemically reactive. follow Therefore, the above substances do not generate pollution, they are not flammable, and they are not harmful to humans or the environment. Not harmful to. Such properties have significant implications for blowing agent production, use and disposal of this material. Provide benefits.

Therefore, the associated CFC materials associated with the release of blowing agents from discarded foam products. No problems will occur. On the contrary, such emissions are due to KX gas directly coming from atmospheric air. Because it is recovered, it forms part of the natural cycle. No chemical reactivity is K. The production of foamed plastics because X gas does not have a negative effect on plastic materials. It is even more convenient for Finally, KX gas has a low boiling point, which makes it significantly less It is advantageous that it does not condense even at low temperatures. Such condensation is caused by the heat conduction of the blowing agent. reduce the rate.

Foamed plastic materials can contain KX gas alone or as a mixture with other blowing agents. Can have gas-filled bubbles.

Due to its low thermal conductivity, it is often convenient to use KX gas alone. Because the λ value of more gases is lower than the thermal conductivity calculated by normal interpolation, other Significant advantages are still obtained by using KX gas mixed with a foaming agent. KX Ga This saves time. In principle, the blowing agent used with KX gas can be The blowing agents known in the art can be carbon dioxide, carbon oxide, nitrogen, large Conveniently selected from air, argon, volatile hydrocarbons or mixtures thereof be able to.

The plastic matrix that forms part of the foamed plastic material is a plastic foam. It can be any type of material suitable as a material.

Examples of suitable plastic materials are thermoset plastics and thermoplastics. Includes both. Examples of thermosetting plastics are polyurethane, polyisocyanur unsaturated polyesters including vinyl esters, allyl plastics, phenolic For example, formaldehyde and monohydric or polyhydric phenol or A type of plastic produced by condensing urea or furanol. - Formaldehyde plastics and melamine - Formaldehyde plastics Amino plastics, amide plastics, imide plastics, and EPO plastics, including Oxide plastics and vulcanized elastomers, such as natural rubber and ethylene plastics. Contains lopyrene terpolymer rubber. An example of a suitable thermoplastic is vinyl Plastics, such as polystyrene, polyvinyl chloride and acrylic esters Plastics, polyolefins such as polyethylene and polypropylene, Polyolefins, amide plastics, and imitations that are crosslinked simultaneously with or after foaming. plastic, polyurethane, ester plastic, polycarbonate, aluminum Setal plastics, polyphenylene oxides, various copolymers such as AB S (acrylate butadiene styrene) and thermoplastic elastomer.

Particularly advantageously, the plastic matrix used is a polyurethane plastic. Ru. The above materials are particularly suitable for producing insulating foams. This is polyurethane can be made by varying the amount and type of plastic starting material used. This is because it provides a particularly favorable opportunity to manufacture products.

Krypton and xenon have a power of 9.5 and 5.5 mW/m’K, respectively. It has a thermal conductivity that is the same as CFCII, which has a thermal conductivity of 8 mW/m'K. That's about it. Therefore, it has almost the same good insulation properties as when using CFC materials. It is possible to obtain a heat insulating material that

Other scope of applicability of the invention will become apparent from the detailed description below. but While the detailed description and specific examples indicate preferred embodiments of the invention, they are given by way of illustration only. It is intended that various modifications and improvements may be made within the spirit and scope of the present invention. It should be understood that this is because it will be obvious to those skilled in the art from the detailed description.

Detailed description of the invention Foaming can be performed using gas alone as a blowing agent or gas in combination with other conventional blowing agents. and can be carried out by conventional foaming techniques known per se. foaming The equipment used can be any known equipment used for such foaming processes. .

When producing the insulating foamed plastic material of the present invention, the combination of Kryp1hen and xenon is mixture or krypton and xenon and one or more known blowing agents, such as HBO /C0I3. HCOOH/CO, argon, nitrogen, oxygen, popular air, volatile carbon Hydrogen oxide or similar known blowing agents are used in blowing agent and I-2. This specification and request In the range of interest, rKXJ or rKX gas is Indicates a mixture with non. In the present invention, KX or the plastic material used If using polyurethane or polyurethane, should a combination of KX and HIIIO/COB be used? preferable.

■＜ In addition to X gas, if the entire blowing agent or liquid or solid substance is included, +1 substance plastics by traditional methods, i.e. usually before adding the gaseous component of the blowing agent. Add to ingredients. HBO/COB is part of the foaming agent used for foaming polyurethane and tan. When used as a polyol, add water to the second polyol component. Similar person By adding formic acid to the polyol component, one liter of carbon oxide is converted into isocyanate. -1. Components can be generated by any reaction.

plus the gaseous component of the blowing agent, i.e. KX gas and possible supplementary gaseous blowing agent It can be added to the tick raw material by dissolving or dispersing it. Based on two components For plastic materials, adding a gas blowing agent to one or both components I can do it. Dispersion of the gaseous blowing agent can be achieved, for example, by vigorously agitating the blowing agent or This can be done by applying it under pressure through a porous material or by a combination of both. give

The addition of a blowing agent requires a pressure that exceeds the pressure at which the injection is carried out by both dissolution and dispersion. It must be carried out by force.

Following the addition of the blowing agent, the feedstock is held at suitably high pressure, which allows for the release of the blowing agent. We have to prevent people from leaving early.

The addition of the blowing agent is conveniently carried out by means of a mixing device in conjunction with the injection itself. .

The blowing agent may be added at a suitable temperature, e.g. 10°C to 7°C, depending on the material and equipment used. Carry out at a temperature of 0°C.

The amount of gas blowing agent used will depend on the desired properties of the final insulating foam, such as the bulk of the foam. Determined by density and possible supplementary blowing agent amount, e.g. 880/C0I3. determined. Gas blowing agent used in producing the insulating foam plastic material of the present invention of? can be easily calculated by a person skilled in the art. Using only KX gas as a blowing agent If a foam with a density of 50 g fi is to be produced, about 19 parts by volume of KX gas will be added. For each volume part of the plastic raw material (used in 7), the volume marked F is at a pressure of 1 bar. is calculated. Using such volume ratios, approximately 9506 of the volume of foam with blowing agent A foam material consisting of is obtained. However, the above two calculations are theoretical. This is actually Loss of blowing agent and final LF in the bubble that may deviate from 1 bar This is because adjustments to the force must be made. Such adjustments shall be made by the manufacturer in question. Based on simple tests performed on the structure, the decision must be made.

When using dispersion, the smallest possible cells are preferred for the final foam; The aim is always to obtain the smallest possible bubbles. To obtain good thermal conductivity , the final foam has an average cell diameter of less than 1.5 mm, preferably less than 0.5 mm. It is below. Based on this requirement, the allowable bubble size is calculations based on parameters such as dispersion pressure and injection pressure. Wear.

Injection can be carried out, for example, by methods commonly known for foaming. reaction Immediately after the mixture is discharged from the mixing device and the pressure is reduced, the melted foam is removed. A dissolved or dispersed blowing agent is a cause bubbles. The heat generated by the reaction between the plastic materials immediately after mixing is Further promotes bubble release and expansion, thereby promoting foam formation. . When chemically reactive blowing agents are used supplementally with gaseous blowing agents, the chemical reaction generation of gas as a result of or simultaneously with or somewhat after the physically determined foaming. do. Water mixed with the polyol component of polyurethane is a chemically reactive blowing agent. This is mentioned as an example. During this reaction, added water or isocyanate and reaction I7, - CO2 is generated which contributes to foaming.

In principle, any type of plastic material suitable for the production of foamed plastics The plastic material forming part of the insulating foamed plastic material of the present invention How can it be used? 1. Manufacturing of plastic materials is qualified 1. T materials. or into a phase that is sufficiently plastic to be formed by casting, injection molding, compression molding, etc. and implement it. Traditional plastic materials usually fall into two main groups, thermoplastics plus It is divided into thermosetting plastics and thermosetting plastics.

Thermoplastic Plus Deck can be obtained by heating the material to a plastic state. It is characterized by After forming, the material has a substantially unchanged chemical structure2, and thus the material It is possible to melt the material.

Thermoset plastics are molded or normally produced or not thermoplastic plastics. It is characterized by - including a chemical reaction that shows the crosslinking of sea urchin molecular chains. thermoset plastic The raw materials used in the manufacture of the It can exist as a minute. Curing reactions can be thermally or chemically initiated I can do it. Examples of such curing reactions are described below.

polyurethane Polyurethanes are produced by reacting polyols with isocyanates, thereby creating, among other things, Forming a urethane bond between the polyol component and the isocyanate component Manufacture more. The raw material component is supplied in liquid state, and this raw material component is provided with possible supplements. It has good storage properties even after adding the agent. These two ingredients are usually kept at room temperature or at room temperature. Mix at a slightly higher temperature. The chain length and degree of crosslinking of the reaction products are Number of functional groups and reaction process between the polyol component, isocyanate component, and catalyst used depends on temperature and other conditions. The mechanical properties of the produced polyurethane material are Can be adjusted within a wide range and thus the required foaming conditions and final foaming The desired properties of the product can be determined by choosing the starting components and reaction conditions and so on. Those skilled in the art are well aware of how this can be achieved. Polyurethane is a relatively inexpensive material. This is convenient.

A type of polyurethane is polyisosilane, which is characterized by its chemical structure or heterocyclic group. It is annulate. Polyisocyanurates are suitable for foaming and have particularly good protection. Has fire properties.

The starting materials for the production of polyurethanes or polyisocyanurates are well known to those skilled in the art. It is being An overview of such starting materials is provided in U.S. Pat. No. 4,120,923. and the references contained therein, including but not limited to.

polyester plastic Polyester plastics are made from unsaturated polyester resins and can be copolymerized with them. It can also be produced by reaction with a compound.

An example is the crosslinking of unsaturated oligoesters dissolved in styrene as copolymerizable substances. including. The above reaction is based on free radical reactions such as ester chains and styrene. This can be carried out by adding organic peroxides that open the heavy bonds. traditionally , such liquid, cold-curing polyesters are used in the manufacture of glass fiber reinforced structures. It will be done. However, this material is also suitable for foaming. However, the range of characteristics that can change is much narrower than polyurethane.

Polyester is also an inexpensive material.

For use in the production of foamed plastics with copolymerizable polyester compounds An overview of examples of unsaturated polyester resins that can be obtained is provided in U.S. Patent No. 4.120.9, cited above. No. 23 specification and the references contained therein or limited thereto. Not determined.

phenolic plastic Phenol plastic is produced by condensation of phenol and formaldehyde. I can do that. Intermediate products that are not completely condensed are used as raw materials for plastics. In particular, this property can be improved by using excess phenol or by using excess formamine. Depends on whether you use rudehyde. Liquid and solid phenolic plastic raw materials It is possible to manufacture both materials. Curing of liquid raw materials is done by adding acid or heating. The solid raw materials, which are thermoplastic, are usually formed by molding before the final reaction. Ru. In particular, phenolic plastics of the raw or liquid type are suitable for foaming.

During foaming, phenol is produced by directly reacting phenol with formaldehyde. It is also possible to produce foamed plastics from rolled plastics. is possible The range is essentially narrower than for polyurethane. However, phenol plasti Because it is self-extinguishing, its price is low and its flame resistance is extremely good.

Resorcinol, melamine and urea can also be condensed with formaldehyde to Producing intermediate products with corresponding possible applications as phenol plastic raw materials It is possible to accomplish something. However, the price of such materials is higher than the price.

One or more blowing agents can be used in the production of foamed plastics. Effect of foaming agent The result is that the gas release occurs in very large numbers that are evenly distributed throughout the plastic material. physical and/or What happens at the right time during the processing of plastic raw materials with chemical conditions? Depends on. The above gas release, which gives the material its cellular structure, is due to pure physical conditions or chemical It can be based on scientific reactions.

For pure physical foaming, this is done in advance using a liquid or gas blowing agent. Introduced into a plastic material or one or more plastic raw materials. gas release The physical conditions that cause foaming due to this are usually temperature rise (usually the heat of reaction). ), and/or pressure drop, or changing solubility conditions due to chemical reactions. The release of gas can lead to granular material acting as a graft. This can occur due to input. KX gas is included in blowing agents that are impact or purely physical .

The presence of blowing agents improves the properties of solid plastic materials by acting as a softening agent. quality may be affected. Such effects are usually disadvantageous and undesirable. KX gas is chemically Being inert, they do not produce such untoward effects. Foam material produced The mechanical properties and dimensions of the material prevent evaporation of the blowing agent by sealing the surface. If not, the blowing agent may change further over time as it evaporates.

Traditionally, physical foaming with CFCII and addition of polyol components to Chemical foaming caused by Hf (0), which generates CO2 when reacting with cyanide-1 components. The combination is used in 17 tank frames. CI? Alternative to C11 The corresponding combination O)+L' using KX gas can be advantageously used.

Foaming h'S using only HI'IO/CO have

Among the methods for producing polyurethane foam, use of pre-foaming method 1 , -5 CFCII or a blowing agent with a low boiling point, e.g. dissolved in the raw material under pressure. Traditionally, CFCI2 is used in combination with nitrogen or CO2. low boiling point The blowing agent should be drained from the raw material mixture or mixed/extracted (7), and immediately form a pre-foamed product. and then the heat of reaction gradually releases the part of the blowing agent with a higher boiling point. , thereby filling the required type or capacity. In addition, preforming using KX gas The method may be combined with other environmentally acceptable blowing agents. Wear.

The production of foamed plastics for insulation can be carried out with conventional equipment. Ru. Naturally, the equipment used will be determined by the type of plastic in question.

Boliu I/Tanform is preferably a block form or insulated. Produced either by injecting into a container. The block form is It can optionally be used as a continuous method, where the raw material mixture is mixed in a fixed pattern. A lance that moves according to the Introduced by a spear-shaped ball). This produces large foam blocks. 1, 21, - are cut into plate shapes and used, for example, as insulation building materials. fill the cavity Direct foaming is used, inter alia, for the production of coolers and pipes for local heating.

Mixing of the raw materials before injection is carried out in a mixing device according to well-known principles. do. Typically, mixing of gaseous blowing agents for pre-foaming involves agitating the raw materials. The foaming agent is introduced into the bottom of the container under pressure of several bars.

Important examples of thermoplastics suitable for foaming are polystyrene, polysalt vinyl and polyolefins. Currently, polystyrene foam or insulation It is the most important thermoplastic foam used. polystyrene foam -1, many more methods are known. the two most commonly known The methods used are 1) expansion of pre-expanded granules in the mold cavity and 2) extrusion. It is foaming related to. The pre-expanded antibiotic used in method l) is heated to Based on polystyrene granules with a blowing agent that performs possible foaming, i.e. pre-expansion. Manufactured accordingly. A known blowing agent is pentane. Then pre-inflate The mold is filled with the antiseptic, and steam is introduced into the mold. This steam will resist other expansion and welding Occurs due to Foaming in method 2) (in this case, the polystyrene material is Chemical blowing agents that decompose at temperatures below the outlet temperature or in the extruder If the molten bolystine does not contain any physical blowing agent dissolved under pressure No. As the melt exits the extruder, the pressure drop causes foaming or foaming. live. Both in polystyrene and the corresponding thermoplastics described. In the foaming method according to the present invention, KX gas is completely or partially used as a foaming agent. It seems possible to use it as

To evaluate the insulation properties of foamed plastic, the total thermal conductivity λ is measured. foaming Thermal conductivity of plastic materials consists of three factors for heat conduction: ■) Heat conduction through the gas present in the holes of the bubbles; 2) Heat conduction through the solid plastic material. normal heat conduction, 3) heat radiation Theoretically, there may also be a factor from convection in the bubble - the L period factor is more important than other factors. If the bubble is of normal size, factors 1 and 2 will be affected by the actual measurement. It can be omitted in calculations. Conventional ports filled with air bubbles or CFC11 For lislenf f-1, the ratio of the other three factors is conventionally 2:1:l. It is estimated that.

Some λ values for various materials are shown below.

Insulation material (instructive value) mw/m’k mineral wool 33 50g, 'I polystyrene foam prepared using CFCII 17-20 50g/l polystyrene foam prepared using 8BO/CO2 24-30 shots Foaming agents etc. (Value for gas used for liquid blowing agent) Atmospheric air 26.2 a) Carbon dioxide 16.9 a) Helium 155.9 a) Neon 49.5 a) CC1qF, CFCII 8. Ob) CHCIBCFq, HCFCI23 9.6 b’) CkCCII3F, HCFCI4119.4 b) - Carbon oxide Approximately 25 a) Jay Kestin (J, Kestin), Dubrico nee Wake Wakeham, W., A., “Transport Properties O. Transport Properties of Fluid s), Hemisphere Publishing Corp. blishingCarp, ), New York, etc., 1 decimal point from the value of 1988 The numbers below are rounded off.

b) K.T. Dishart, J.A. A. Creazzo, M.R. Ascuff (M, R, Ascough) Polyurethanes World Combres (P World Congress) 1987'', 19 59 pages of report from Aachen, September 29, 1987 - October 2, 1987 Converted from the page value.

The λ values for mixtures of two gases do not match those found by linear interpolation. stomach. The result of the λ value is thus that it is one of the gases with the lowest thermal conductivity. Determined by This is because foams with low λ values are used for environmental or economic reasons. It can actually be used if it is desirable to conserve the agent. Has CFCll Even if polyurethane foam has a significant CO□ content, It is thus well known that it has an acceptably low λ value. C02 is Alternatively, it can be mixed with KX gas.

From the above, it is not necessary that the KX gas used has a particularly high degree of purity. It will become clear. Therefore, the content of atmospheric air is equal to krypton. or 10.8X 10-5 volume%, and xenon or only o, 5xio-5 volume %, but the industrially acceptable price based on atmospheric air is KX gas. Is it possible to manufacture In the present invention, the heat insulating material is, for example, a pipe for local heating. An alternative method for isolating KX gas from atmospheric air, as it can be used for insulation Demand for KX gas is expected to increase, providing an incentive to develop affordable methods. .

Because it is a type of xenon or KX gas with the lowest thermal conductivity, it is KX corresponding to the ratio of capacitance between krypton and xenon of 27.2 It may be advantageous to use KX gas which has a higher xenon content than the gas mixture. It is also imagined that Therefore, other sources, especially atmospheric air, contain more xenon. A source with a host may also be suitable.

The portion of closed cells in the foam determines the thermal insulation benefits of the blowing agent. Polyurethane foam About 85% closed cells (excluding complete foams) are usually obtained in foams. other The bubbles are connected to the surface of the foam, and if the surface is not sealed, the bubbles above will have a high λ Provides access to atmospheric air with value.

Therefore, sealing is an important factor in maintaining the insulation effect of closed cells. This is a bubble wall This is because it has never been possible to completely avoid its spread both internally and externally. This problem, Especially known from polyurethane foam containing CO2, this polyurethane foam It has a thermal insulation capacity that is either poorer than CFCll or better than atmospheric air.

Therefore, in unsealed foams, CO2 is replaced somewhat rapidly by atmospheric air. This increases the λ value of foaming. blowing agent through plastic matrix The rate of diffusion is usually facilitated when chemically controlled absorption occurs. Therefore In this case, it is also advantageous that the KX gas is chemically inert.

However, problems with sealing do not occur during all foaming processes. foam or cavity For example, if cooling mantles or local heating pipes are being fabricated. During construction, the sealing of the plastic material itself often results in a cavity filled with itself. form during curing against the wall of the wall.

In Examples 1-4 below, the method of the invention is illustrated by laboratory scale tests. . When the method of the present invention is expanded to an industrial scale, static long-term gasification of raw materials becomes unnecessary. Instead, it must be agitated and carried out under appropriate pressure. It is possible to use methods based on non-introduction.

Example 1 This example demonstrates the production of polyurethane foam by foaming using KX gas on a laboratory scale. The structure is illustrated below. The KX gas used has a ratio of krypton and xenon of approximately 27:2. Included in ratio.

A polyol mixture was prepared with the following composition: CARADO LTM) 555-1 100g DimeTM (DIME”) 6 1g Te TEGO3TABTM) B12O31g Anhydrous Glycerol 3 g Calator™ is a polyol component available from Shell.

Dime TM6 is a catalyst in the form of N,N-dimethylcyclohexylamine, You can get help from the well. T.H.Gold Schmidt Knee ・G Erasen (Th, Goldschmidt AG, Es5en) This is an unregistered trademark in Denmark for a foam control agent available from

200 g of the above mixture was taken into a calorimeter cylinder and a KX gas pressure of lO bar was applied to 2 Added for 96 hours at 0°C. 350 g of isocyanate mixture (caradate TM (CARADATETM) 30, available from Shell) is processed in the same way. Ta. After rapid mixing of the two components treated with KX gas, 500 g of the resulting mixture The mixture was poured into a 4-liter box-shaped aluminum mold, which was immediately sealed with a lid. .

After foaming and cooling, the material was removed from the mold. Material λ value and slope and equilibrium The directional compressive strength is measured and the material is further analyzed to determine the density and the cracking of closed cells. The ratio was measured.

Example 2 A combination of the KX gas used in Example 1 and HBO/COB was used as a blowing agent. Polyurethane foaming in laboratory tests.

A polyol mixture having the following composition was prepared (Caradol TM555-1 100g 200g of the above mixture was charged into a calorimeter phone in the same manner as in Example 1. was treated to absorb KX gas. 350g of isocyanate component (Karaday I - T″30) was treated similarly. The ingredients were rapidly mixed and 500 g of the mixture was The mixture was poured into a 1-liter box-shaped aluminum mold and sealed directly with a lid. Foaming After cooling, material 1 was removed from the mold and processed in a manner similar to that described in Example 1. Therefore, this example is a laboratory test using the KX gas used in Example 1 as a blowing agent. The free foaming material I/Tan is illustrated in FIG.

This test tests 100 g of a mixture of ingredients in a 1 liter open plastic container. ryi+ = Performed in the same manner as in Example 1 except that it was injected for free foaming (- . In the second test, cream time, rise time and non-adhesion time (non- In this example, the KX gas used in Example 1 was measured. Polyurethane during free foaming on laboratory scale in combination with HBO/CO2 The following example illustrates the production of a foam.

This method was carried out in the same manner as in Example 3 except that the raw materials described in Example 2 were used.

BEST MODE FOR CARRYING OUT THE INVENTION The currently best known example of the invention is to convert the insulating foam plastic material into a foamed polyurethane material. The second type is manufactured in the form of urethane.

The present invention has been described as follows, and the invention may be described in many ways. It's obvious. Such variations are considered to be a departure from the spirit and scope of the invention. All such improvements that have not been made and are obvious to those skilled in the art are included within the scope of the following claims. It is a strange thing.

Summary book A blowing agent using, at least in part, a mixture of krypton and xenon as a blowing agent. Foaming of plastic materials or plastic precursor materials with foaming agents, secondary A method of producing more insulating foam plus material. Mixing krypton and xenon When used as a blowing agent, especially ozone caused by conventional CFC gases. Ecological damage to the water layer is avoided, while good thermal insulation capacity is obtained in the meantime. .

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Claims (8)

[Claims] 1. Foaming of plastic materials or plastic precursor materials with blowing agents In producing insulating foam plastic materials, Using a mixture of krypton and xenon at least in part as blowing agent A method for producing a heat-insulating foamed plastic material characterized by: 2. Krypton and xenon can be mixed with conventional blowing agents and used as blowing agents. The method according to claim 1, characterized in that: 3. If the plastic material or plastic precursor material is Cyanurate, unsaturated polyester, allyl plastic, phenol plasti adhesive, amino plastic, amide plastic, imide plastic, epoxy Cid plastic, elastomer, vinyl plastic, polyolefin, S Tel plastic, polycarbonate, acetal plastic, polyphenylene produces plastic products selected from carbon oxide and ABS plastics. The method according to claim 1, characterized in that: 4. The plastic precursor material is a precursor material to polyurethane plastic. The method according to claim 3, characterized in that: 5. A blowing agent used in the method according to claim 1, comprising xenon and krypton. A blowing agent characterized in that it contains a mixture of. 6. Claims characterized in that the mixture of xenon and krypton is unpurified The blowing agent according to Box 5. 7. Use of a mixture containing krypton and xenon as a blowing agent. 8. A sealed gas is applied to a plastic base material manufactured by the method according to claim 1. Insulating foam plastic material with filled air bubbles.