KR20120095011A - Polyolefin copolymer resin form for an air duct and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A polyolefin copolymer resin is provided to have low heat conductivity, and to excellent insulation and heat shielding performance due to temperature difference between inside and outside of an air duct, thereby having excellent anti-dew effect. CONSTITUTION: A polyolefin copolymer resin for air duct comprises 0.1-5 parts by weight of a crosslinking agent, 1-30 parts by weight of blowing agent based on 100.0 parts by weight of polyolefin based copolymer resin. The foam mixture is extrusion-molded to a seedbed with constant width and thickness through an extruder. In a foaming furnace the seedbed is crosslinked and blown. The crosslinked and blown foam has an elliptical cell shape having a horizontal long axis along a drawing direction, and has heat conductivity of 0.0250-0.0360 kcal/mh°C, and foaming magnification of 10-30 times.

Description

Polyolefin copolymer resin foam for air duct and manufacturing method thereof {Polyolefin copolymer resin form for an air duct and manufacturing method

The present invention relates to a polyolefin copolymer resin foam for air ducts applicable to air ducts for transporting cooling and heating gases of products such as home appliances, automobiles, and heating and heating devices for buildings. , The foam mixture including the crosslinking agent and the blowing agent is processed by chemical crosslinking, has an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction, and has a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C. and a foaming ratio of 10 to 30 times. Polyolefin copolymer resin foam for air duct; The foam mixture including polyolefin-based copolymer resin, foaming agent and foaming aid, which is a basic resin, is processed by electron beam crosslinking to have an ellipsoidal foam cell shape having a horizontal major axis in the pulling direction, and a thermal conductivity of 0.0250 to 0.0360㎉ / mh ° C. The present invention relates to a polyolefin copolymer resin foam for air ducts having a foaming ratio of 10 to 30 times, and a mixture preparation step, an extrusion process, a crosslinking and a foaming step (or Electron beam crosslinking process and foaming process) is a field for producing a polyolefin copolymer resin foam for air ducts.

Foams using polyolefin copolymer resins are used for various purposes in real life or modern industry because of their cushioning characteristics, and are used in various construction materials, automobile interior materials, and other industrial materials. In addition to excellent cushioning, lower thermal conductivity and weight, and is used in various ways in place of polyolefin copolymer resin injection molding, except that it is used as a component of a product requiring very good physical strength. However, the polyolefin copolymer resin foam according to the prior art further includes a functional composition in the polyolefin copolymer resin, which is a basic resin, to further exhibit various functionalities such as cushioning, flame retardancy, or electrostatic dissipation, and the conventional polyolefin copolymer resin. Compared with the air duct made of hard material, it has the effect of lowering the thermal conductivity and reducing the weight by more than 90%, and showing the dustproof and soundproofing properties. In order to exhibit better thermal insulation and heat shielding properties, there is a lack of thermal conductivity which is somewhat insufficient, and continuous research and development thereof is required.

The present invention is a conventional air duct is produced using a polyolefin copolymer resin injection molding has a high thermal conductivity, there is a large weight problem, the air duct using a polyolefin copolymer resin foam presented to compensate for this, polyolefin used in various fields Since the copolymer resin foam is used as it is, it effectively blocks the heat of the hot air outside the air duct to the cooling gas passing through the air duct, or the cold air outside the air duct to the heating gas passing through the air duct. The main purpose is to provide a solution to the problem with insufficient thermal conductivity to effectively insulate the heat.

The present invention is to realize the desired object as described above,

0.1-5 weight part of crosslinking agents with respect to 100 weight part of polyolefin copolymer resins which are basic resins; 1 to 30 parts by weight of a blowing agent; comprising a foam mixture, wherein the foam mixture is extruded into a base plate having a predetermined width and thickness as an extruder, and the extruded base plate is crosslinked and foamed as a foaming furnace, and crosslinked. The foamed foam has an ellipsoidal foam cell shape having a horizontal major axis in the take-out direction, and has a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C and a foaming ratio of 10 to 30 times. And a mixture preparation process for producing the polyolefin copolymer resin foam for the air duct; Extrusion process; It provides a method for producing a polyolefin copolymer resin foam for air ducts comprising a crosslinking and foaming step,

1-30 weight part of blowing agents with respect to 100 weight part of polyolefin copolymer resins which are basic resins; 0.1 to 5 parts by weight of a foaming aid; comprising a foam mixture, wherein the foam mixture is extruded into a base plate having a predetermined width and thickness as an extruder, and the extruded base plate is crosslinked and foamed as a foaming furnace, The cross-linked and foamed foam has an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction, and has a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C and a foaming ratio of 10 to 30 times. A mixture preparation step for producing a foam and the polyolefin copolymer resin foam for the air duct; Extrusion process; Electron beam crosslinking process; It proposes a polyolefin copolymer resin foam manufacturing method for an air duct comprising a foaming step.

Polyolefin copolymer resin foam for air duct according to the present invention and a method for producing the same according to the present invention as described above to specify a foam cell shape constituting the foam, thereby presenting a preferred method for producing a polyolefin copolymer resin foam for air duct, Compared with general foams, the thermal conductivity is significantly reduced, and the effect of realizing a polyolefin foam for air ducts with excellent heat insulation and heat shielding properties can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Table which shows the test result of the test example by the preferable Example 1 of this invention, and the comparative example by a prior art.
Figure 2 is a table showing the test results of the test example according to the preferred embodiment 2 of the present invention and the comparative example according to the prior art.

The present invention relates to a polyolefin copolymer resin foam for air ducts applicable to air ducts for transporting cooling and heating gases of products such as home appliances, automobiles, and heating and heating devices for buildings. The foam mixture including the crosslinking agent and the foaming agent is processed by chemical crosslinking, and has an ellipsoidal foam cell shape having a horizontal major axis in the takeout direction, and has a thermal conductivity of 0.0250 to 0.0360 kPa / mh ° C and 10 to 30 times. Polyolefin copolymer resin foam for air duct having a foaming ratio of; The foam mixture including polyolefin-based copolymer resin, foaming agent and foaming aid, which is a basic resin, is processed by electron beam crosslinking to have an ellipsoidal foam cell shape having a horizontal major axis in the pulling direction, and a thermal conductivity of 0.0250 to 0.0360㎉ / mh ° C. The present invention relates to a polyolefin copolymer resin foam for air ducts having a foaming ratio of 10 to 30 times, and a mixture preparation step, an extrusion process, a crosslinking and a foaming step (or The electron beam crosslinking process and the foaming process) relates to a method for producing a polyolefin copolymer resin foam for air ducts.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 2 illustrating embodiments of the present invention.

By chemical crosslinking For air duct Polyolefin  Copolymer resin Foam .

0.1-5 weight part of crosslinking agents with respect to 100 weight part of polyolefin copolymer resins which are basic resins; 1 to 30 parts by weight of a blowing agent; comprising a foam mixture, wherein the foam mixture is extruded into a base plate having a predetermined width and thickness as an extruder, and the extruded base plate is crosslinked and foamed as a foaming furnace, and crosslinked. The foamed foam has an ellipsoidal foam cell shape having a horizontal major axis in the take-out direction, and has a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C and a foaming ratio of 10 to 30 times. It is about.

Specifically, the polyolefin-based copolymer resin is one of thermoplastic synthetic resins and has a light and flexible property, and is widely known as a main component of a foam. In the present invention, a polypropylene-based copolymer resin, a polyethylene-based copolymer resin, or a polypropylene-based copolymer is known. Both master batches suitably mixed with resins and polyethylene copolymer resins can be used. When polyethylene copolymer resins are included in the basic resin, HDPE (high density polyethylene), LDPE (low density polyethylene), etc. can be used. However, for ease of foaming magnification control, it is preferable to use LDPE having a lower density than HDPE.

In addition, the crosslinking agent is an organic peroxide such as hydroperoxide, dialkyl-aryl peroxide (dicumyl peroxide), diacyl peroxide, peroxy ketal, peroxy ester, peroxycarbonate, ketone peroxite, vinyl monomer, acrylic compound , At least one of an unsaturated resin crosslinking agent or a polyurethane crosslinking agent such as a methacryl-based compound, an epoxy-based compound, or the like, wherein the crosslinking agent separates some hydrogen bonded to carbon constituting the basic resin, which is a polymer, and partially hydrogen Macroscopically strengthens the heat resistance through the crosslinking between the polymer chains of the polyolefin-based copolymer resin in the prepared polyolefin copolymer resin foam for the function of crosslinking each separated polyethylene-based polymer (polymer) chain. Phosphorus effect can be obtained, as well as crosslinking During the foaming process (in particular, the firing), a configuration for adjusting an appropriate viscosity of the foam mixture is processed extrusion process. In connection with the above, if the composition ratio of the crosslinking agent is less than 0.1 parts by weight based on 100 parts by weight of the basic resin, the heat resistance of the prepared polyolefin copolymer resin foam for air ducts is insufficient due to insufficient crosslinking degree, or the foam mixture processed by extrusion process When the foaming is low, there is a possibility that a flow phenomenon may occur, and when it contains more than 5 parts by weight, since the viscosity of the foamed mixture subjected to the extrusion process is too high when the foaming is foamed, there is a possibility that the productivity may be lowered. It is preferable to maintain the composition ratio of 0.1-5 weight part.

In addition to the above, the present invention can be configured to further include a crosslinking aid when the base resin of the foam mixture comprises a polypropylene copolymer resin. That is, the polypropylene-based copolymer resin has a configuration that further includes carbon as compared to the polyethylene-based copolymer resin, and since the crosslinking agent alone may not facilitate chemical crosslinking, it is possible that triallyisosi may help the activity of the crosslinking agent. A crosslinking assistant such as triallylisocyanuate, trimethylolpropane trimetacrylate, or metallic ionomer, and the like may be further included in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the base resin. At this time, if the composition ratio of the crosslinking aid is less than 0.1 part by weight, the content of the crosslinking aid is insufficient because the content of the crosslinking aid is insufficient. If the content of the crosslinking aid is more than 5 parts by weight, the content of the crosslinking aid may be excessive and the crosslinking agent may be activated during the extrusion process. Since there is, it is preferable to further include 0.1 to 5 parts by weight based on 100 parts by weight of the basic resin.

In addition, the foaming agent included in the foam mixture together with the polyolefin-based copolymer resin and the crosslinking agent as the base resin, inorganic foaming agents such as ammonium bicarbonate, sodium bicarbonate, sodium borohydride or azodicarbonamide, dinitroso pentamethylene tetramine, Any one or more organic foaming agents such as benzene sulfonyl hydrazide, toluenesulfonyl hydrazide, toluenesulfonyl semicarbazide and the like can be used, and the blowing agent has a high chemical stability because of its constant chemical stability against thermal energy. In the invention, in the extrusion process operated at 90 to 210 ° C., the foam mixture including the blowing agent is decomposed (expanded) at an early stage, thereby obtaining an effect capable of preventing the production of a poor polyolefin copolymer resin foam for air ducts.

In the present invention, when the base resin comprises a polypropylene copolymer resin, the foam mixture is based on 100 parts by weight of the base resin, cadmium compound (calcmium compound), calcium compound (calsium compound), zinc compound (zinc compound) ), A magnesium compound, iron compound (iron compound) or copper compound (copper compound) any one or more of the foaming auxiliary agent may be configured to further include 0.1 to 5 parts by weight. That is, the polypropylene copolymer resin has a constitution that further includes carbon as compared with the polyethylene copolymer resin, and the foaming ratio tends to be lower than that of the foam containing the polyethylene copolymer resin as a cast material. As the foaming aid, the foaming ratio of the foaming aid during the crosslinking / foaming process can be finely controlled than the foaming agent as the composition ratio of the foaming aid, and the foaming temperature can be controlled (activation of the foaming agent). At this time, the composition ratio of the foaming aid is preferably not more than 5 parts by weight with respect to 100 parts by weight of the base resin so that the foaming agent is excessively activated and does not foam in the extrusion process, and the composition ratio of 0.1 part by weight or more so that the activity of the foaming agent is not insignificant. It is desirable to have.

In connection with the above, the present invention is a polyolefin copolymer for an air duct manufactured by extruding a foam mixture of the above configuration into a base plate having a predetermined width and thickness as an extruder, and crosslinking and foaming the extruded base plate as a foaming furnace. To prepare a resin foam, the finished polyolefin copolymer for air duct resin foam has an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction, the thermal conductivity of 0.0250 ~ 0.0360㎉ / mh ℃ and a foaming ratio of 10 to 30 times It is preferable to be configured to have.

That is, the conventional polyolefin copolymer resin foam has a foam cell shape of Comparative Example 1-1 of Fig. 1 when the mother plate is vertically cut in the take-out direction (length direction) after the foam is drawn in, and the crosslinking and foaming is completed. Likewise, it consists of a plurality of foam cells having a round shape (circular) similar in horizontal length (length direction) and vertical length (thickness direction), where the width length of the foam cell corresponding to the width direction of the foam is the horizontal length and the vertical length. Naturally determined according to the ratio of the foam cell of the round shape as described above, because the horizontal length and the vertical length are similar, the convection of the air present in the foam cell is active, so that one side of the foam (foam foam) Both sides forming the thickness of the one side and the other side is called.) Heat (heat or cold heat) in the form that can be easily conducted, but the take-out direction according to the present invention The foam cell shape of the ellipsoidal shape having a horizontal long axis (horizontal length of the horizontal axis) is a draw-in direction of the foam having a long axis (horizontal length direction) rather than conducting convection of air present in the foam cell from one side of the foam to the other side. Since the effect of conducting heat to the side is greater, the effect of lowering the thermal conductivity from one side to the other side of the foam having a vertical short axis (short vertical axis) in the take-out direction is realized.

In addition, the polyolefin copolymer resin foam for air duct according to the present invention having an ellipsoidal foam cell shape having a horizontal major axis in the take-off direction as described above is vertical in the take-up direction, compared to a conventional foam having a round-shaped foam cell shape. Even if the foam cells have the same number of foam cells at the height of one section (foam thickness), the foam cells have an ellipsoidal shape with a horizontal major axis in the take-off direction, so that the thermal conductivity of the foam can be reduced and the thickness of the foam can be made thinner. It also exerts the effect of reducing the volume of the air duct produced by the present invention.

In addition, the present invention may be any shape as long as the foam cell shape has a horizontal major axis in the take-up direction, and the axis perpendicular to the horizontal major axis has a short axis (vertical short axis). When the horizontal major axis length is 1, it is more preferable that the vertical short axis length in the take-up direction is configured in the shape of an ellipse sphere having a ratio of the length ratio of 0.2 to 0.8.

Specifically, when the foam cell shape has a horizontal major axis length in the take-out direction of 1, and the vertical short length in the take-up direction has a ratio of less than 0.2 times, the foam cell shape in the ellipsoidal shape becomes excessively flat to form a horizontal shape of the foam cell. If the physical strength with respect to the long axis length is reduced, a problem arises that the manufactured polyolefin copolymer resin foam for air duct easily breaks, and if the vertical short length in the take-up direction has a ratio exceeding 0.8 times, an ellipsoidal shape Is too close to the shape of a circular sphere, the problem of low thermal conductivity effect is insufficient, it is preferable that the foam cell shape of the ellipsoidal sphere has the length ratio of the horizontal major axis and the vertical minor axis.

In addition, the polyolefin copolymer resin foam for air duct according to the present invention has the foam cell shape as described above, thereby exhibiting an effect of having a significantly lower thermal conductivity than the conventional foam. That is, the foam according to the prior art is a foam having a predetermined thermal conductivity by adjusting the composition ratio of the composition of the foam mixture, or by adjusting the foaming ratio in order to lower the thermal conductivity without considering the foam cell shape at all (generally, 0.0360㎉ / has a thermal conductivity of mh ° C. or higher.), but the polyolefin copolymer resin foam for air duct according to the present invention has an ellipsoidal foam cell shape having a horizontal major axis in the takeout direction and a vertical axis in the takeout direction, thereby achieving 0.0250 The effect of having a thermal conductivity of ˜0.0360 Pa / mh ° C. is realized, and the thermal conductivity is remarkably reduced in comparison with the conventional foam, and thus the polyolefin copolymer resin foam for air duct having excellent heat insulation and heat shielding properties can be achieved.

In addition, when the polyolefin copolymer resin foam for air duct according to the present invention has a thermal conductivity of less than 0.0250 Pa / mh ° C., the heat duct and thermal insulation of the air duct are excellent due to the low thermal conductivity of the polyolefin copolymer resin foam for air duct. As a result, the density of the foam increases, so that the effect of lowering the weight of the air duct may be insignificant. When it exceeds 0.0360 Pa / mh, the effect on low thermal conductivity may be insignificant. It is preferable.

The polyolefin copolymer resin foam for air duct according to the present invention which is crosslinked and foamed may have a foaming ratio of 10 to 60 times that of a general foam, but more preferably has a foaming ratio of 10 to 30 times. Do. Specifically, the foam cell shape according to the present invention has a greater effect of conducting heat in the take-up direction of the foam having a long axis, rather than conducting convection of air present in the foam cell from one side of the foam to the other side, The effect of lowering the thermal conductivity from one side of the foam having a vertical axis in the pulling direction to the other side occurs, even when processing a foam having a low foaming ratio of 30 times or less incorporating a small amount of air inside the foam cell. The effect of lowering the thermal conductivity of the entire polyolefin copolymer resin foam for use in air ducts can be realized. At this time, if the expansion ratio of the polyolefin copolymer resin foam for air duct exceeds 30 times, the expansion ratio of the manufactured polyolefin copolymer resin foam for air duct may be increased, and the volume of the foam may be increased. It is preferable to have a foaming ratio of 10 to 30 times because the effect of adjusting the thermal conductivity through adjustment is insignificant.

By chemical crosslinking For air duct Polyolefin  Copolymer resin Foam  Manufacturing method.

0.1-5 weight part of crosslinking agents with respect to 100 weight part of polyolefin copolymer resins which are basic resins; 1 to 30 parts by weight of a blowing agent; mixture preparation step of preparing a foam mixture comprising; An extrusion step of extruding the foam mixture prepared in the mixture preparation step by using an extruder into a base plate having a predetermined width and thickness; And a crosslinking / foaming step of chemically crosslinking the mother plate extruded by the extrusion process treatment as a crosslinking agent included in the preparation of the mixture, and foaming the foam into a foam having a foaming ratio of 10 to 30 times as a foaming furnace. The foamed crosslinking / foaming process relates to a polyolefin copolymer resin foam manufacturing method for air ducts having an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction and having a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C.

The mixture preparation process includes a crosslinking agent and a foaming agent (if the base resin includes a polypropylene-based copolymer resin, at least one of a foaming aid or a crosslinking aid) in the polyolefin-based copolymer resin, which is the basic resin. As a process of preparing the foam mixture, the specific description of each composition will replace the specific description of the above 'polyolefin copolymer resin foam for air duct by chemical crosslinking'. In addition, according to the judgment of those skilled in the art, the mixture preparation process of the present invention mixes polyethylene copolymer resin and polypropylene copolymer resin at a predetermined composition ratio to pre-process polyolefin copolymer resin (master batch), which is an extruded and dried basic resin. It is also possible to prepare a foam mixture by mixing with other compositions.

In addition, an extrusion process of extruding the foam mixture prepared in the mixture preparation step into a base plate having a predetermined width and thickness using an extruder is performed by extruding the foam mixture prepared as the mixture preparation process into a base plate having a predetermined width and thickness. As a process, a general single screw extruder or twin screw extruder (in case of feeding the foaming agent by using a separate screw in order to further prevent premature foaming of the mother board due to the foaming agent). It is possible to process by using, the extruder having a screw with a cylinder having a temperature of 90 ~ 210 ℃ and a die having a temperature of 90 ~ 210 ℃ and kneading the foam mixture by extrusion molding, so the preparation of the mixture Uniformize the entire composition contained in the foam mixture prepared in the process A summing effect. In addition, when the temperature of the cylinder and die is lower than 90 ° C, the base resin melts insignificantly, and the kneading property of the foam mixture is reduced. If the temperature exceeds 210 ° C, the crosslinking agent and the foaming agent are crosslinked in the following crosslinking and foaming process. It is preferable to maintain the temperatures of the cylinders and dies of the extruder at 90 to 210 ° C because problems of crosslinking and foaming of the foam mixture to be foamed occur early. More specifically, in the case where the base resin is a polyethylene copolymer resin and a polypropylene copolymer resin, the composition ratio of the polyethylene copolymer resin is higher than that of the polypropylene copolymer resin, or the base resin is a polyethylene air In the case of consisting of only the resin, it is economical to set the temperature of the extruder so that the polyethylene copolymer resin can be smoothly melted by maintaining the temperature of the cylinder and the die at 90 to 140 ° C. In the case where the copolymer copolymer resin and the polypropylene copolymer resin are mixed, the composition ratio of the polypropylene copolymer resin is higher than that of the polyethylene copolymer resin, or the base resin is composed of only the polypropylene copolymer resin. And polypropylene by maintaining the temperature of the die at 120-210 ° C. To set the temperature of the extruder so that the copolymer resin can be smoothly melting is preferred. At this time, it will be apparent that the foam mixture is extruded and the width and thickness of the processed base plate can be variously adjusted according to the judgment of those skilled in the art.

In the crosslinking / foaming step of the present invention, an ellipsoidal foam cell shape having a horizontal long axis in the take-up direction is chemically crosslinked by a crosslinking agent included in the mixture preparation step by chemically crosslinking the mother plate extruded by the extrusion process. A process for processing a polyolefin copolymer resin foam for air ducts having a low thermal conductivity by forming a foam cell having a low thermal conductivity, this process can be carried out by a foaming method generally used, but hot air having a temperature of 140 ~ 300 ℃ inside It is preferable to use a foaming furnace capable of treating this. The foaming furnace may be used either vertically or horizontally, but when the temperature inside the foaming furnace is applied at less than 140 ° C., the crosslinking agent contained in the foam mixture is inactivated and the polyolefin-based copolymer which is the main component of the foam mixture is activated. In the crosslinking and foaming process (especially during foaming), the viscosity of the base plate to be crosslinked and foamed becomes high during the crosslinking and foaming process (especially during foaming), and it is difficult to induce proper productivity. It is preferable to maintain the temperature of 140-300 ° C. when the temperature is exceeded by 300 ° C., since the surface of the base plate is deteriorated due to excessive heat, which makes it difficult to produce high-quality polyolefin copolymer resin foam for air ducts. In addition, the speed of the hot air applied to the base plate can be freely adjusted according to the judgment of those skilled in the art, but it is preferable to have a wind speed of 10 ~ 50hz so that the surface of the polyolefin copolymer resin foam for air ducts and the foam cell shape can be manufactured in good quality. .

In addition, the present invention, in order to process the foam cell shape of the polyolefin copolymer resin foam for air duct manufactured by the crosslinking and foaming process in the form of an ellipsoidal sphere having a horizontal major axis in the take-up direction, the drawing speed and crosslinking of the mother board introduced into the foaming furnace ㆍ It is feasible by raising the take-up speed of the foam which is completed and is taken out in the foaming furnace than the ratio of the conventional plate drawing speed and the foam take-out speed.

Specifically, the drawing speed of the mother board drawn into the conventional foaming furnace and the drawing speed of the foam drawn out of the foaming furnace are volume growth of the mother board which is crosslinked and foamed in the foaming furnace and processed into foam when the foaming ratio of the foam is 10 to 30 times. In particular, in order to consider the length growth in the present invention, when the drawing furnace drawing speed is 1 m / min, the foam drawing speed has a speed ratio of less than 1.7 m / min. The speed ratio between the speed and the foam take-up speed is configured to have a speed ratio of 1.7 to 4.0 m / min when the inlet speed is 1 m / min by the foaming of the mother board, so that the foam cell shape is horizontally long in the foam take-out direction. It can be processed into an ellipsoidal shape having.

That is, the present invention is a foam cell which is taken out by providing a horizontal pulling force in the take-up direction of the foam to be drawn by rapidly pulling the foam that is introduced into the foam plate into the base plate and crosslinked and foamed faster than the foam taking speed according to the prior art. It is possible to obtain an effect that can be processed into an ellipsoidal shape having a horizontal long axis in the take-up direction.

At this time, when the pulling speed of the foam plate is 1 m / min, if the take-out speed of the foam is less than the speed ratio of 1.7 m / min, the take-off speed of the foam is similar to the conventional take-out speed of the foam, so that it is horizontal in the take-out direction of the foam. Since the pulling force is difficult to provide further, when the horizontal major axis length of the foam cell in the pulling direction is 1, an ellipsoidal foam cell shape having a vertical axis length of more than 0.8 times is formed, and thus the polyolefin for air duct manufactured When the low thermal conductivity effect of the copolymer resin foam is insufficient, and when the drawing speed is 1 m / min due to the foaming of the mother board, if the pulling speed of the foam exceeds the speed ratio of 4.0 m / min, the foam taking speed is excessively high. When the foam cell shape is fast and the horizontal major axis length is 1 in the pulling direction, the vertical short axis length in the pulling direction is less than 0.2 times, and the foam cell shape in the ellipsoid shape is too flat. Since the physical strength with respect to the horizontal long axis length of the foam cell is lowered to cause a problem that the manufactured polyolefin copolymer resin foam for air duct can be easily broken, the mother plate is introduced into the foaming furnace at the above speed ratio. It is preferable that the crosslinked and foamed foam is taken out.

In addition, the present invention is a horizontal foaming furnace in which a heating section equipped with a heater for applying hot air to the base plate (or a cross-linking and foaming to form a foam) is horizontally formed or a vertical foaming furnace in which the heating section is vertically formed. Any of these may be used, and foam processing having a foaming ratio of 10 to 30 times can be variously applied within the above speed ratio range according to the judgment of those skilled in the art.

The following are the test examples 1-1 to 1-4 which show the polyolefin copolymer resin foam for air ducts manufactured by the preferred Example 1 of this invention, the comparative example 1-1 which shows the foam manufactured by the prior art, and the prior art It relates to Comparative Example 1-2 which shows the molded object (for air duct) which blow-injected by this.

[Test Example 1-1]

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg LDPE (L), 0.8 kg dialkyl-arylperoxide (based on 100%) and 15 kg azodicarbonamide (based on 100%).

2. Extrusion Process

-Inject the foam mixture prepared in 1. into a single screw extruder (screw rotation speed, 28rpm) with the temperature of cylinder and die preheated to 100 ℃ to extrude the mother board with length × width × thickness 200m × 500mm × 2.5mm Mold.

3. Crosslinking and Foaming Process

-Using a horizontal foaming furnace pre-heated with a temperature of 200 ° C. and a wind speed of 20 Hz, the extruded base plate at 2. was introduced at a speed of 3.2 m / min, crosslinked and foamed, and the crosslinking degree was 50% and the foaming ratio was 15. A polyolefin copolymer resin foam for air ducts was prepared and drawn at a speed of 8.9 m / min.

[Test Example 1-2]

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg LDPE (L), 0.8 kg dialkyl-arylperoxide (based on 100%) and 15 kg azodicarbonamide (based on 100%).

2. Extrusion Process

-Inject the foam mixture prepared in 1. into a single screw extruder (screw rotation speed, 28rpm) with the temperature of cylinder and die preheated to 100 ℃ to extrude the mother board with length × width × thickness 200m × 500mm × 2.5mm Mold.

3. Crosslinking and Foaming Process

-Using a foaming furnace preheated to a temperature of 200 ° C and a wind speed of 20hz, the extruded mother plate at 2. was introduced at a rate of 2.9 m / min and crosslinked and foamed to obtain a crosslinking degree of 50% and a foaming ratio of 15 times. A polyolefin copolymer resin foam for air ducts is prepared and drawn at a speed of 9.0 m / min.

[Test Example 1-3]

1. Mixture Preparation Process

100 kg of PP (L), 0.8 kg of dialkyl-aryl peroxide (based on 100%), 15 kg of azodicarbonamide (based on 100%), 0.5 kg of trimethylolpropane trimethacrylate (based on 100%) To prepare a foam mixture.

2. Extrusion Process

-Inject the foam mixture prepared in 1. into a single screw extruder (screw rotation speed, 28rpm) with the temperature of cylinder and die preheated to 100 ℃ to extrude the mother board with length × width × thickness 200m × 500mm × 2.5mm Mold.

3. Crosslinking and Foaming Process

-Using a horizontal foaming furnace pre-heated with a temperature of 200 ° C. and a wind speed of 20 Hz, the extruded base plate at 2. was introduced at a rate of 3.8 m / min, crosslinked and foamed, and the degree of crosslinking was 50% and the foaming ratio was 15. A polyolefin copolymer resin foam for air ducts is prepared and drawn at a speed of 9.2 m / min.

[Test Example 1-4]

1. Mixture Preparation Process

100 kg of PP (L), 0.8 kg of dialkyl-aryl peroxide (based on 100%), 15 kg of azodicarbonamide (based on 100%), 0.5 kg of trimethylolpropane trimethacrylate (based on 100%) To prepare a foam mixture.

2. Extrusion Process

-Inject the foam mixture prepared in 1. into a single screw extruder (screw rotation speed, 28rpm) with the temperature of cylinder and die preheated to 100 ℃ to extrude the mother board with length × width × thickness 200m × 500mm × 2.5mm Mold.

3. Crosslinking and Foaming Process

-Using a horizontal foaming furnace pre-heated with a temperature of 200 ° C. and a wind speed of 20 Hz, the extruded base plate at 2. was introduced at a rate of 3.0 m / min, crosslinked and foamed, and the degree of crosslinking was 50% and the foaming ratio was 15. A polyolefin copolymer resin foam for air ducts is prepared and drawn at a speed of 9.2 m / min.

[Comparative Example 1-1]

1. Mixture Preparation Process

100 kg of PP (L), 0.8 kg of dialkyl-aryl peroxide (based on 100%), 15 kg of azodicarbonamide (based on 100%), 0.5 kg of trimethylolpropane trimethacrylate (based on 100%) To prepare a foam mixture.

2. Extrusion Process

-Inject the foam mixture prepared in 1. into a single screw extruder (screw rotation speed, 28rpm) with the temperature of cylinder and die preheated to 100 ℃ to extrude the mother board with length × width × thickness 200m × 500mm × 2.5mm Mold.

3. Crosslinking and Foaming Process

-Using a horizontal foaming furnace pre-heated with a temperature of 200 ° C. and a wind speed of 20 Hz, the extruded base plate at 2. was introduced at a rate of 3.8 m / min, crosslinked and foamed, and the degree of crosslinking was 50% and the foaming ratio was 15. A polyolefin copolymer resin foam for air ducts is prepared and drawn at a speed of 6.2 m / min.

Comparative Example 1-2

1. Prepare 100kg of HDPE (L company), insert the cylinder and die into a single screw extruder (screw rotation speed, 28rpm) preheated to 200 ℃, and then length × width × thickness are 300mm × 300mm × 2.5. The molten HDPE is injected into a mold having an injection form of mm.

[Test]

Each of the specimens processed in Test Examples 1-1 to 1-4 and Comparative Examples 1-1 to 1-2 is vertically cut in the take-up direction (length direction) in which the specimen is taken, and is perpendicular to the length of the horizontal axis and the horizontal axis. Measure the length ratio of the vertical axis to the horizontal axis by measuring the length of one vertical axis, measure the thermal conductivity according to KS L 9016-05, and test the specimen (width * length * thickness) The weight of each of the specimens of 10 * 10 * 10 mm) was measured to obtain a result as shown in FIG.

[result]

Test Examples 1-1 to 1-4 prepared according to Example 1 of the present invention as shown in Table 1 is the air of Comparative Example 1-2 by blow molding injection of polyethylene copolymer resin (LDPE) according to the prior art It can be seen that the thermal conductivity and weight are significantly lower than that of the duct injection, and the thermal conductivity is considerably lower than that of the foam of Comparative Example 1-1 manufactured by a conventional general foam. That is, the polyolefin copolymer resin foam for air ducts according to the present invention in which the cell shape of the foam processed by adjusting the drawing speed of the mother plate and the foaming speed of the foam to the foaming furnace is formed in an oval shape has a circular cell shape according to the prior art. Compared to the foam having low thermal conductivity and low thermal conductivity, excellent thermal insulation and thermal insulation according to the temperature difference between the inside and outside of the air duct, and excellent condensation prevention effect due to the thermal insulation and heat shielding inside the air duct It is also possible to obtain an effect of preventing the growth of bacteria that may be present in.

By electron beam crosslinking For air duct Polyolefin  Copolymer resin Foam .

The present invention provides a polyolefin copolymer resin foam for air ducts through chemical crosslinking as in Example 1 and a method for manufacturing the same, and a polyolefin copolymer resin foam for air ducts through electron beam crosslinking as in Example 2 and its preparation Give a way. Hereinafter, matters overlapping with the first embodiment of the detailed description of the second embodiment will be replaced by the detailed description of the first embodiment.

Compared to Example 1, the polyolefin copolymer resin foam for air ducts according to Example 2 uses the electron beam crosslinking method instead of chemical crosslinking of the base resin, and thus the foam mixture does not include a crosslinking agent, and the foamability is smooth. In order to make a configuration further comprising a foaming aid.

Specifically, the present invention is 1 to 30 parts by weight of the blowing agent relative to 100 parts by weight of the polyolefin copolymer resin which is a basic resin; 0.1 to 5 parts by weight of a foaming aid; comprising a foam mixture, wherein the foam mixture is extruded into a base plate having a predetermined width and thickness as an extruder, and the extruded base plate is crosslinked and foamed as a foaming furnace, The cross-linked and foamed foam has an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction, and has a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C and a foaming ratio of 10 to 30 times. It relates to a foam.

The base resin may be a polypropylene copolymer resin, a polyethylene copolymer resin or a master batch in which a polypropylene copolymer resin and a polyethylene copolymer resin are appropriately mixed, and the blowing agent may be ammonium bicarbonate or sodium bicarbonate. Inorganic foaming agents such as sodium borohydride, or organic foaming agents such as azodicarbonamide, dinitroso pentamethylene tetramine, benzene sulfonyl hydrazide, toluenesulfonyl hydrazide, toluenesulfonyl semicarbazide Is available. Since the composition ratio of the base resin and the blowing agent has the same purpose and effect as the base resin and the blowing agent described in Example 1, the description of Example 1 will be replaced.

In addition, the present invention, in addition to the foaming agent to finely control the foam expansion ratio of the foaming agent than the foaming agent, in order to control the foaming temperature of the foamed base plate (activation of the foaming agent) cadmium compound (cadmium compound), calcium compound (calsium compound), zinc Including 0.1 to 5 parts by weight of a foaming aid of an inorganic compound such as a zinc compound, a magnesium compound, an iron compound, or a copper compound, based on 100 parts by weight of the base resin. desirable. In this case, if the content ratio of the foaming aid is less than 0.1 part by weight, the content of the foaming aid is insignificant, and it is difficult to exert the function of the foaming aid smoothly. It is preferable to maintain the above content ratio because the physical strength of the completed polyolefin copolymer resin foam for air ducts may drop.

In addition, the present invention, when the base resin comprises a polypropylene copolymer resin, the foam mixture is based on 100 parts by weight of the base resin, Triallylisocyanuate (triallylisocyanuate), trimethylolpropane trimethacrylate ( It is possible to further comprise 0.1 to 5 parts by weight of a crosslinking aid such as trimethylolpropane trimetacrylate) or a metallic ionomer (does not include a crosslinking aid). That is, the polypropylene copolymer resin has a configuration that further includes carbon as compared to the polyethylene copolymer resin, and the electron beam crosslinking alone may not facilitate crosslinking between the polypropylene copolymer resin polymers (carbon chains). The crosslinking assistant which can further activate crosslinking between the polypropylene copolymer resin polymer by the electron beam applied at the time of crosslinking can be further included, and the composition ratio of the crosslinking assistant is less than 0.1 part by weight with respect to 100 parts by weight of the base resin. If the content of the crosslinking assistant is insufficient, the effect of the crosslinking assistant is insufficient, and if it exceeds 5 parts by weight, the content of the crosslinking assistant may be excessive and the crosslinking agent may be activated during the extrusion process. It is preferable to contain 0.1-5 weight part further.

In another aspect, the present invention is extrusion molding the foam mixture into a base plate having a predetermined width and thickness as an extruder, and irradiated with an electron beam to the extruded base plate as an electron beam irradiator to crosslink the mother plate, the electron beam cross-linked base plate By foaming as a foaming furnace, a polyolefin copolymer resin foam for air ducts having a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C and having a foaming ratio of 10 to 30 times can be realized. Since the thermal conductivity of the polyolefin copolymer resin foam for air duct according to the present embodiment also has the same purpose and effect as the thermal conductivity of the polyolefin copolymer resin foam for air duct according to Example 1, the detailed description thereof will be described in Example 1. I will replace it with

In connection with the above, the polyolefin copolymer resin foam for air duct according to the present invention which has been crosslinked and foamed may have a foaming ratio of 10 to 60 times that of a general foam, but as described in Example 1 It is more preferable to have a foaming ratio of ˜30 times, and a detailed description thereof will be replaced with the description by the first embodiment.

By electron beam crosslinking For air duct Polyolefin  Copolymer resin Foam  Manufacturing method.

The method for producing a polyolefin copolymer resin foam for air duct according to Example 2 is composed of some compositions of the foam mixture of the mixture preparation step differently compared to Example 1, and the crosslinking / foaming step performed after the extrusion step There is a difference between the electron beam crosslinking process and the foaming process.

That is, the present invention is 1 to 30 parts by weight of the blowing agent relative to 100 parts by weight of the polyolefin copolymer resin which is a basic resin; 0.1-5 parts by weight of a foaming aid; mixture preparation step of preparing a foam mixture comprising; An extrusion step of extruding the foam mixture prepared in the mixture preparation step by using an extruder into a base plate having a predetermined width and thickness; An electron beam crosslinking step of crosslinking the mother plate by irradiating an electron beam having a predetermined voltage and a predetermined electron beam to the mother plate extruded by the extrusion process using the electron beam irradiator; And a foaming step of foaming the electron beam cross-linking process into a foam having a foaming ratio of 10 to 30 times as a foaming furnace, and the foaming process treated foam has a thermal conductivity of 0.0250 to 0.0360 ㎉ / mh ° C. It is configured to have.

Specifically, the mixture preparation process is a process for preparing a foam mixture, the 'polyolefin copolymer resin foam for air duct by chemical crosslinking' of Example 1 or Example 2 or the polyolefin for air duct by electron beam crosslinking As described in the detailed description of the 'copolymer resin foam', a foaming agent and a foaming aid (the crosslinking aid may be further included in the case where the base resin includes a polyethylene-based copolymer resin) are included in the polyolefin-based copolymer resin. As a process for preparing a foam mixture comprising a, the specific description is the 'polyolefin copolymer resin foam for air duct by chemical crosslinking' of Example 1 or the 'polyolefin air for air duct by electron beam crosslinking of the second embodiment It will replace the specific description of the 'copolymer resin foam'. In addition, according to the judgment of those skilled in the art, the mixture preparation process of the present invention mixes polyethylene copolymer resin and polypropylene copolymer resin at a predetermined composition ratio to pre-process polyolefin copolymer resin (master batch), which is an extruded and dried basic resin. It is also possible to prepare a foam mixture by mixing with other compositions.

In addition, the present invention is subjected to an extrusion process for extruding the foam mixture prepared as a mixture preparation step into a base plate having a predetermined width and thickness. This process is carried out as an extruder having the same purpose and effect as in Example 1, the temperature range of the cylinder and the die constituting the extruder also has the same purpose and effect as in Example 1.

The present invention performs an electron beam cross-linking process for crosslinking the mother plate by irradiating an electron beam having a predetermined voltage and a predetermined electron beam to the mother plate having a predetermined width and thickness subjected to the extrusion process as described above. Specifically, the crosslinking of the polyolefin copolymer resin foam for air duct using an electron beam (the same concept as the basic resin crosslinking or the mother board crosslinking) is applied to the carbon chain of the polyolefin copolymer resin by irradiating an accelerated electron beam to the polyolefin copolymer resin. Polyolefin-based copolymer resin radicals are generated by removing hydrogen from a chain, and the generated radicals induce crosslinking between carbon chains of the polyolefin-based copolymer resin. At this time, since the polyolefin copolymer resin generally has similar chemical properties, the crosslinking voltage and the amount of the crosslinked electron beam applied during the electron beam crosslinking may be performed regardless of the type of the polyolefin copolymer resin. However, the strength of the crosslinking voltage should be maintained at 100 ~ 1500kv according to the thickness of the extruded base plate during the extrusion process so that the appropriate crosslinking can be concluded between the polyolefin copolymer resin carbon chains and the crosslinked electron dose is the blowing agent contained in the foam mixture. It is preferable to maintain 0.1 to 5.0 Mrad depending on the density and physical properties of the.

In other words, if the crosslinking voltage is less than 100kv, the thickness of the mother board may not be able to penetrate the electron beam to the inside of the mother board, so that the inside of the mother board cannot be crosslinked. It is preferable to apply a crosslinking voltage of 100 to 1500 kv because electron beams overlap and a crosslinking reaction occurs, which causes a problem that a polyolefin copolymer resin foam for air ducts having a desired foaming ratio can not be obtained during the foaming step; The crosslinked electron dose is also preferably maintained at 0.1 to 5.0 Mrad for the same reason as the crosslinking voltage.

In addition, the foaming process of the present invention by decomposing the foaming agent included in the mixture preparation step of the electron beam cross-linking process in the foaming furnace to form a foam cell having an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction on the mother board As a process for producing a polyolefin copolymer resin foam for air ducts having a low thermal conductivity, the same process as the foaming treatment in the crosslinking and foaming process of Example 1 is performed. At this time, since the foaming step of the present embodiment does not include a crosslinking agent that induces chemical crosslinking, it will be obvious to those skilled in the art that only foaming by the blowing agent is performed.

The following are the test examples 2-1 to 2-4 which show the polyolefin copolymer resin foam for air ducts manufactured by the preferable Example 2 of this invention, the comparative example 2-1 which shows the foam manufactured by the prior art, and the prior art It is a test example and a comparative example regarding the comparative example 2-2 which show the molded object (for air duct) which blow-injected by this.

[Test Example 2-1]

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg LDPE (L company), 15 kg azodicarbonamide (100% equivalent) and 0.5 kg zinc stearate (Zn-st).

2. Extrusion Process

-In the single screw extruder (screw rotation speed, 28rpm) with the temperature of the cylinder and die preheated to 100 ° C, the foam mixture prepared in the above 1 is added at a feed rate of 120 kg / hr, and the length x width x thickness is 200 m x 670 mm x A 0.5 mm mother plate is extruded.

3. Electron beam crosslinking process

A cross-linking treatment was carried out by charging and drawing the mother plate extruded in 2. into an electron beam cross-linking device having a voltage of 500 kv and an electron dose of 2 Mard at a rate of 30 m / min, to prepare a mother board having a crosslinking degree of 50%.

4. Foaming process

-Using foaming furnace pre-heated with temperature 200 ℃ and wind speed 20hz, the crosslinked base plate was foamed by adding 3.6m / min at the rate of 3.6m / min, and polyolefin copolymer resin for air duct with 15 times expansion ratio The foam is prepared and drawn at a speed of 9.3 m / min.

[Test Example 2-2]

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg LDPE (L company), 15 kg azodicarbonamide (100% equivalent) and 0.5 kg zinc stearate (Zn-st).

2. Extrusion Process

-In the single screw extruder (screw rotation speed, 28rpm) with the temperature of the cylinder and die preheated to 100 ° C, the foam mixture prepared in the above 1 is added at a feed rate of 120 kg / hr, and the length x width x thickness is 200 m x 670 mm x A 0.5 mm mother plate is extruded.

3. Electron beam crosslinking process

A cross-linking treatment was carried out by charging and drawing the mother plate extruded in 2. into an electron beam cross-linking device having a voltage of 500 kv and an electron dose of 2 Mard at a rate of 30 m / min, to prepare a mother board having a crosslinking degree of 50%.

4. Foaming process

-Using a foaming furnace preheated to a temperature of 200 ° C. and a wind speed of 20 Hz, the cross-linked mother board was foamed at a rate of 3.3 m / min, and the foaming ratio was 15 times. The foam is prepared and drawn at a speed of 9.7 m / min.

[Test Example 2-3]

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg of PP (L), 15 kg of azodicarbonamide (100% equivalent), 0.5 kg of zinc stearate (Zn-st) and 1 kg of trimethylolpropane trimethacrylate.

2. Extrusion Process

-In the single screw extruder (screw rotation speed, 28rpm) with the temperature of the cylinder and die preheated to 140 ° C, the foam mixture prepared in the above 1 is added at a feed rate of 120 kg / hr and the length x width x thickness is 200 m x 670 mm x A 0.5 mm mother plate is extruded.

3. Electron beam crosslinking process

A cross-linking treatment was carried out by charging and drawing the mother plate extruded in 2. into an electron beam cross-linking device having a voltage of 500 kv and an electron dose of 2 Mard at a rate of 30 m / min, to prepare a mother board having a crosslinking degree of 50%.

4. Foaming process

-Using foaming furnace pre-heated with temperature 200 ℃ and wind speed 20hz, foaming treatment was carried out by adding the cross-linked base plate at the speed of 4.3m / min, and foaming magnification 15 times of polyolefin copolymer resin for air duct The foam is prepared and drawn at a speed of 10.4 m / min.

[Test Example 2-4]

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg of PP (L), 15 kg of azodicarbonamide (100% equivalent), 0.5 kg of zinc stearate (Zn-st) and 1 kg of trimethylolpropane trimethacrylate.

2. Extrusion Process

-In the single screw extruder (screw rotation speed, 28rpm) with the temperature of the cylinder and die preheated to 140 ° C, the foam mixture prepared in the above 1 is added at a feed rate of 120 kg / hr and the length x width x thickness is 200 m x 670 mm x A 0.5 mm mother plate is extruded.

3. Electron beam crosslinking process

A cross-linking treatment was carried out by charging and drawing the mother plate extruded in 2. into an electron beam cross-linking device having a voltage of 500 kv and an electron dose of 2 Mard at a rate of 30 m / min, to prepare a mother board having a crosslinking degree of 50%.

4. Foaming process

-Using foaming furnace preheated to a temperature of 200 ° C and a wind speed of 20hz, the mother board cross-linked in 3. was foamed at a rate of 4.0 m / min, and foamed at 15 times the air duct polyolefin copolymer resin. The foam is prepared and drawn at a speed of 11.1 m / min.

Comparative Example 2-1

1. Mixture Preparation Process

Prepare a foam mixture by mixing 100 kg LDPE (L company), 15 kg azodicarbonamide (100% equivalent) and 0.5 kg zinc stearate (Zn-st).

2. Extrusion Process

-Put the polyolefin copolymer resin foam mixture for air duct prepared in 1. into 120kg / hr feeding amount into twin screw extruder (screw rotation speed, 20rpm) which preheated and set cylinder and die temperature to 100 ℃. A base plate having a thickness of 200 m x 670 mm x 0.5 mm is extruded.

3. Crosslinking process

A cross-linking treatment was carried out by charging and drawing the mother plate extruded in 2. into an electron beam cross-linking device having a voltage of 500 kv and an electron dose of 2 Mard at a rate of 30 m / min, to prepare a mother board having a crosslinking degree of 50%.

4. Foaming process

-Using foaming furnace pre-heated with temperature 200 ℃ and wind speed 20hz, foaming treatment was carried out by adding the cross-linked base plate at the speed of 4.3m / min, and foaming magnification 15 times of polyolefin copolymer resin for air duct The foam is prepared and drawn at a speed of 6.9 m / min.

Comparative Example 1-2

1. Prepare 100kg of HDPE (L company), insert the cylinder and die into a single screw extruder (screw rotation speed, 28rpm) preheated to 200 ℃, and then length × width × thickness are 300mm × 300mm × 2.5. The molten HDPE is injected into a mold having an injection form of mm.

[Test]

Each of the specimens processed according to Test Examples 2-1 to 2-4 and Comparative Examples 2-1 to 2-2 is vertically cut in the take-up direction (length direction) in which the specimen is to be taken and is perpendicular to the length of the horizontal axis and the horizontal axis. Measure the length ratio of the vertical axis to the horizontal axis by measuring the length of one vertical axis, measure the thermal conductivity according to KS L 9016-05, and test the specimen (width * length * thickness) The weight of each of the specimens of 10 * 10 * 10 mm) was measured to obtain a result as shown in FIG.

[result]

Test Examples 2-1 to 2-4 prepared according to Example 2 of the present invention as shown in Table 2 is the air of Comparative Example 2-2 by blow molding injection of polyethylene copolymer resin (LDPE) according to the prior art It can be seen that the thermal conductivity and weight are significantly lower than that of the duct injection, and the thermal conductivity is considerably lower than that of the foam of Comparative Example 1-1 manufactured by a conventional general foam. That is, the polyolefin copolymer resin foam for air ducts according to the present invention in which the cell shape of the foam processed by adjusting the drawing speed of the mother plate and the foaming speed of the foam to the foaming furnace is formed in an oval shape has a circular cell shape according to the prior art. Compared to the foam having low thermal conductivity and low thermal conductivity, excellent thermal insulation and thermal insulation according to the temperature difference between the inside and outside of the air duct, and excellent condensation prevention effect due to the thermal insulation and heat shielding inside the air duct It is also possible to obtain an effect of preventing the growth of bacteria that may be present in.

The above has been described with reference to a preferred embodiment of the present invention, but is not limited to the above embodiment, the person having ordinary skill in the art to which the present invention pertains through the above embodiments without departing from the gist of the present invention Can be implemented in a variety of changes.

Claims (14)

Per 100 parts by weight of polyolefin-based copolymer resin, which is a basic resin,
0.1-5 weight part of crosslinking agents;
Consists of a foam mixture comprising; 1 to 30 parts by weight of the blowing agent,
The foam mixture is extruded into a base plate having a predetermined width and thickness as an extruder, the extruded base plate is crosslinked and foamed as a foaming furnace, and the crosslinked and foamed foam is an ellipsoidal foam having a horizontal major axis in the take-out direction. A polyolefin copolymer resin foam for air ducts having a cell shape and configured to have a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C. and a foaming ratio of 10 to 30 times.
The method of claim 1,
The foam cell shape,
A polyolefin copolymer resin foam for air ducts, characterized in that when the horizontal major axis length is 1 in the take-out direction, the vertical minor axis length is 0.2 to 0.8.
The method of claim 1,
In the case where the base resin contains a polypropylene copolymer resin,
The foam mixture is based on 100 parts by weight of the base resin,
0.1 to 5 foaming aids of at least one of cadmium compound, calcium compound, zinc compound, magnesium compound, iron compound or copper compound Parts by weight; 0.1-5 parts by weight of at least one crosslinking aid of triallylisocyanuate, trimethylolpropane trimetacrylate, or metallic ionomer; and an air duct further comprising a Polyolefin copolymer resin foam.
Per 100 parts by weight of polyolefin-based copolymer resin, which is a basic resin,
0.1-5 weight part of crosslinking agents;
1 to 30 parts by weight of a blowing agent; mixture preparation step of preparing a foam mixture comprising;
An extrusion step of extruding the foam mixture prepared in the mixture preparation step by using an extruder into a base plate having a predetermined width and thickness;
And a crosslinking / foaming step of chemically crosslinking the base plate extruded by the extrusion process treatment as a crosslinking agent included in the preparation of the mixture, and foaming at a foaming ratio of 10 to 30 times as a foaming furnace. Process-treated foam has an ellipsoidal foam cell shape having a horizontal major axis in the take-up direction, and has a thermal conductivity of 0.0250 ~ 0.0360 Pa / mh ℃ a polyolefin copolymer resin foam manufacturing method for air ducts.
The method of claim 4, wherein
The foam cell shape,
A method for producing a polyolefin copolymer resin foam for air ducts, characterized in that when the horizontal major axis length is 1 in the take-out direction, the vertical minor axis length has a length ratio of 0.2 to 0.8.
The method of claim 4, wherein
The extruder of the extrusion process has a cylinder and die temperature of 90 ~ 210 ℃,
The foaming furnace of the crosslinking / foaming step has a temperature of 140 to 300 ° C. A method for producing a polyolefin copolymer resin foam for air ducts.
The method of claim 4, wherein
The foaming furnace is either a horizontal foaming furnace or a vertical foaming furnace,
When the mother plate pulling speed is 1m / min, the foam take-up speed has a speed ratio of 1.7 ~ 4.0m / min, characterized in that the polyolefin copolymer resin foam manufacturing method for air ducts.
Per 100 parts by weight of polyolefin-based copolymer resin, which is a basic resin,
1 to 30 parts by weight of the blowing agent;
Consists of a foam mixture comprising a foaming aid 0.1 to 5 parts by weight;
The foam mixture is extruded into a base plate having a predetermined width and thickness as an extruder, the extruded base plate is crosslinked and foamed as a foaming furnace, and the crosslinked and foamed foam is an ellipsoidal foam having a horizontal major axis in the take-out direction. A polyolefin copolymer resin foam for air ducts having a cell shape and configured to have a thermal conductivity of 0.0250 to 0.0360 Pa / mh ° C. and a foaming ratio of 10 to 30 times.
9. The method of claim 8,
The foam cell shape,
A polyolefin copolymer resin foam for air ducts, wherein when the horizontal major axis length in the take-out direction is 1, the vertical short length in the take-out direction has a length ratio of 0.2 to 0.8.
9. The method of claim 8,
In the case where the base resin contains a polypropylene copolymer resin,
The foam mixture is based on 100 parts by weight of the base resin,
0.1-5 parts by weight of at least one crosslinking aid of triallylisocyanuate, trimethylolpropane trimetacrylate, or metallic ionomer; and an air duct further comprising a Polyolefin copolymer resin foam.
Per 100 parts by weight of polyolefin-based copolymer resin, which is a basic resin,
1 to 30 parts by weight of the blowing agent;
0.1-5 parts by weight of a foaming aid; mixture preparation step of preparing a foam mixture comprising;
An extrusion step of extruding the foam mixture prepared in the mixture preparation step by using an extruder into a base plate having a predetermined width and thickness;
An electron beam crosslinking step of crosslinking the mother plate by irradiating an electron beam having a predetermined voltage and a predetermined electron beam to the mother plate extruded by the extrusion process using the electron beam irradiator;
The electron beam cross-linking process has a foaming magnification of 10 to 30 times as a foaming furnace Foaming step of foaming into a foam; and the foaming process treated foam has an ellipsoidal foam cell shape having a long axis in the horizontal direction, characterized in that it has a thermal conductivity of 0.0250 ~ 0.0360㎉ / mh ℃ Polyolefin copolymer resin foam production method for air duct.
The method of claim 11,
The foam cell shape,
A method for producing a polyolefin copolymer resin foam for air ducts, characterized in that when the horizontal major axis length is 1 in the take-out direction, the vertical minor axis length has a length ratio of 0.2 to 0.8.
The method of claim 11,
The extruder of the extrusion process has a cylinder and die temperature of 90 ~ 210 ℃,
The electron beam having the predetermined voltage and the predetermined electron dose has a voltage of 100 to 1500kv and an electron dose of 0.1 to 5.0Mrad,
The foaming furnace of the foaming step has a polyolefin copolymer resin foam manufacturing method for air ducts, characterized in that having a 140 ~ 300 ℃.
The method of claim 11,
The foaming furnace is either a horizontal foaming furnace or a vertical foaming furnace,
When the mother plate drawing speed is 1m / min, the foam take-up speed has a speed ratio of 1.7 ~ 4.0m / min, characterized in that the polyolefin copolymer resin foam manufacturing method for air ducts.

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