KR20140083361A - Flame-retarded thermal insulating foam of irradiation cross-linked polyvinyl chloride based and manufacturing method of the same - Google Patents

Abstract

The present invention relates to a polyvinylchloride-based fire-resistant foam insulation cross-linked by an electron beam and a method for manufacturing the same. More specifically, the present invention relates to a polyvinylchloride-based fire-resistant foam insulation cross-linked by an electron beam, including a extrusion-foamed raw material composition including: a resin mixture including 30-70 weight parts of polyvinylchloride (PVC) resin and 30-70 weight parts of chlorinated polyethylene (CPE) resin; and 10-100 weight parts of chlorinated paraffin oil (CPO), based on total 100 weight parts of the resin mixture, and a method for manufacturing the same. The polyvinylchloride-based fire-resistant foam insulation cross-linked by an electron beam includes a highly fire-resistant polyvinylchloride and chlorinated polyethylene resins, thus can be used as a construction insulation material. Since the chlorinated polyethylene resin can be easily mixed with the polyvinylchloride, the degree of cross-linking can be increased to have a high-resolution foam and enhanced insulation thereby.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron beam crosslinked polyvinyl chloride based flame retardant foaming insulating material,

More particularly, the present invention relates to an electron beam crosslinked polyvinyl chloride-based flame retardant foamed insulation material which can be used as a heat insulating material for construction due to excellent heat insulating properties through the production of a high-expansion foam, and a method for manufacturing the same will be.

From the viewpoint of efficient use and conservation of energy, the development and effective use of the insulation material is also very important. Currently, insulating materials are largely classified into organic polymer resin and inorganic materials, and their utilization methods are also changed depending on their physical properties and properties. Generally, organic insulation has better heat insulation, lighter weight, water resistance, processability and impact resistance than inorganic insulation, but is less resistant to heat or durability. Therefore, when multifunctional insulation materials complementary to each characteristic are developed, the limitation of the use range can be greatly alleviated and new applications can be realized.

On the other hand, the polyvinyl chloride (PVC) based foam is a new functional insulation material which is further improved in heat resistance, low temperature resistance, chemical resistance and mechanical strength as well as the general characteristics of the organic insulation material. Which is an organic insulating material capable of exerting an effect. Therefore, such crosslinked polyvinyl chloride-based foam is widely used as a single structural material in various industries such as housing, construction, refrigeration, freezing, LNG storage tanks, aircraft, and ships, and its application is continuously developed. It is a product that is being done.

In particular, when a fire occurs in a building, it causes damage due to smoke or gas generated during combustion. As the combustion becomes active, oxygen around the area becomes insufficient and harmful gas is generated. The smoke generated by incomplete combustion is a large amount of human injury Can be generated. Therefore, it is required that the heat insulating material for construction has excellent flame retardancy in order to minimize the occurrence of a risk factor in the event of a fire. Polyvinyl chloride contains chlorine, which is a flame retardant element, and is basically excellent in flame retardancy.

On the other hand, since the air existing inside the foam insulating material blocks the heat loss by preventing the heat from entering and leaving, the more the pores are contained therein, the better the heat insulating property. In order to form a lot of pores inside the foam insulation, it is necessary to foam at a high magnification. However, the conventional polyvinyl chloride-based foam insulation has a low degree of crosslinking and is difficult to foam at a high magnification, which makes it difficult to secure a certain level of heat insulation.

An object of the present invention is to provide an electron beam crosslinked polyvinyl chloride-based flame retardant foamed insulating material which is improved in heat insulating property due to high-expansion foaming while maintaining excellent flame retardancy, and a method for producing the same.

According to an aspect of the present invention, there is provided a resin composition comprising 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin; And 10 to 100 parts by weight of chlorinated paraffin oil (CPO), based on 100 parts by weight of the resin mixture, is extrusion-foam-molded and provided with an electron beam crosslinked polyvinyl chloride-based fire retardant foamed insulation.

The chlorinated paraffin oil (CPO) may be 20 to 80 parts by weight based on 100 parts by weight of the resin mixture.

The limiting oxygen index of the electron beam crosslinked polyvinyl chloride-based flame retardant foamed insulation material may be 28 or more.

The density of the electron beam cross-linked polyvinyl chloride-based flame retardant foamed insulating material may be 0.025 g / cm ³ to 0.500 g / cm ³ .

The thermal conductivity of the electron beam crosslinked polyvinyl chloride-based flame retardant foamed insulation material may be 0.04 W / mK or less.

On the other hand, the raw material composition may contain 5 to 50 parts by weight of a flame retardant based on 100 parts by weight of the resin mixture; And 1 to 5 parts by weight of a heat stabilizer.

Here, the flame retardant may be any one selected from the group consisting of antimony trioxide, decabromophenyl oxide, and magnesium hydroxide, or a mixture of two or more thereof.

The heat stabilizer may be any one selected from the group consisting of tin maleate, tin laurate, and powder tin maleate esters, or two or more of them.

(S1) 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin, 100 parts by weight of the resin mixture , 10 to 100 parts by weight of chlorinated paraffin oil (CPO), 5 to 50 parts by weight of a flame retardant, 1 to 5 parts by weight of a heat stabilizer, 5 to 50 parts by weight of a foaming agent and 0.1 to 3 parts by weight of a foaming auxiliary step; (S2) feeding the raw material composition into an extruder and melt extruding the extruded material to produce an extruded sheet; (S3) crosslinking the resin mixture by irradiating the extruded sheet with an electron beam; And (S4) heating the resultant product after the step (S3) to foam the foaming agent to form a foamed body. The method for manufacturing an electronically crosslinked polyvinyl chloride-based fire retardant foamed insulating material is also provided.

Wherein the step (S1) comprises: mixing 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin, 10 to 100 parts by weight By weight of chlorinated paraffin oil (CPO), and 1 to 5 parts by weight of a heat stabilizer at 70 to 150 캜 for 5 to 20 minutes; A first dispersion step in which 5 to 50 parts by weight of a flame retardant is added to the resulting product after the mixing step based on 100 parts by weight of the resin mixture and the dispersion is carried out at 70 to 150 DEG C for 2 to 10 minutes; And 5 to 50 parts by weight of a foaming agent and 0.1 to 3 parts by weight of a foaming auxiliary are added to the resultant product after the first dispersion step based on 100 parts by weight of the resin mixture and a second dispersion which is dispersed at 70 to 150 DEG C for 2 to 10 minutes Step; < / RTI >

The blowing agent may be at least one selected from the group consisting of ammonium bicarbonate, sodium hydrogencarbonate, sodium borohydride, azodicarbonamide, dinitrosopentamethylenetetramine, benzenesulfonylhydrazide, toluenesulfonylhydrazide, Zein and oxybis (benzenesulfonyl hydrazide), or a mixture of two or more thereof.

The foaming aid may be any one selected from the group consisting of a cadmium compound, a calcium compound, a zinc compound, a magnesium compound, an iron compound and a copper compound, or a mixture of two or more thereof.

The extruder may be a single extruder or a twin extruder, and the extrusion temperature may be maintained at 90 to 140 캜.

In the step (S3), the accelerating electron beam may be irradiated with a voltage of 100 to 1,500 kV and an electron dose of 0.5 to 10 Mrad.

In the step (S4), the resultant product obtained after the step (S3) may be heated to a temperature of 150 to 250 ° C to foam the foaming agent to form a foam.

The electron beam crosslinked polyvinyl chloride-based fire retardant foamed insulating material according to the present invention includes a polyvinyl chloride resin excellent in flame retardancy and a chlorinated polyethylene resin, and can be used as a heat insulating material for construction.

The electron beam crosslinked polyvinyl chloride-based flame retardant foaming insulating material according to the present invention comprises a chlorinated polyethylene resin excellent in compatibility with polyvinyl chloride resin, and can increase the degree of crosslinking and enable foaming at a high magnification, thereby improving the heat insulation property do.

In addition, the electron beam crosslinked polyvinyl chloride-based flame retardant foamed insulating material according to the present invention can contain chlorinated paraffin oil as a plasticizer to further improve the flame retardancy.

Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not to be construed as limiting of the invention, And the like.

The electron beam crosslinked polyvinyl chloride-based fire retardant foaming insulating material according to the present invention is a resin mixture comprising 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin; And 10 to 100 parts by weight of chlorinated paraffin oil (CPO) based on 100 parts by weight of the resin mixture.

When the content of the polyvinyl chloride resin is less than 30 parts by weight and the content of the chlorinated polyethylene resin is more than 70 parts by weight, the limit oxygen index to be described later is lowered, which is disadvantageous in ensuring the flame retardancy. Is more than 70 parts by weight, and when the content of the chlorinated polyethylene resin is less than 30 parts by weight, the state of the test piece of the resin mixture becomes poor, and crosslinking and foaming are not performed well.

Since the foam made of a polyvinyl chloride resin has a good breaking property, a certain amount of plasticizer should be included. In the present invention, 10 to 100 parts by weight, or 20 to 80 parts by weight, based on 100 parts by weight of the resin mixture, Chlorinated paraffin oil is included as plasticizer. If the value is out of the above range, the limit oxygen index becomes low, which is disadvantageous in ensuring flame retardancy. In addition, as described later, the chlorinated paraffin oil is excellent in flame retardancy of the foamed thermal insulation material of the present invention, and degradation does not occur even if a heat stabilizer is added in the future, so that performance deterioration as a foamed thermal insulation material does not occur.

On the other hand, in order for a heat insulating material to be used as a construction material, it should have excellent flame retardancy and heat insulation.

The standard specification for building machinery facilities established by the Ministry of Land, Transport and Maritime has a limiting oxygen index (LOI) of 28 or more, which is a flammability measurement index measured by KS M ISO 4589-2, a test method relating to flame retardancy of insulation .

According to the present invention, the polyvinyl chloride resin, the chlorinated polyethylene resin and the chlorinated paraffin oil contain chlorine as a flame-retardant element and have excellent flame retardancy, and the limiting oxygen index of the electron-beam crosslinked polyvinyl chloride- 28 or more.

On the other hand, the heat insulating property of the foamed heat insulating material means the degree of the air existing inside the foamed heat insulating material blocks the heat from entering and leaving to prevent heat loss. Therefore, the foamed heat insulating material composed of the polyvinyl chloride resin conventionally has a low degree of crosslinking due to the chain structure of the polymer, so that foaming of about 20 times is performed, and a certain level of heat insulating property .

However, in the present invention, a resin mixture comprising 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin excellent in compatibility with the polyvinyl chloride resin is used as a base resin , The crosslinking degree is increased, foaming at a high magnification of about 30 to 40 times is possible, and the heat insulating property is improved. At this time, the thermal conductivity of the foamed insulating material of the present invention may be 0.04 W / mK or less.

And, due to the high expansion rate foaming, the foam insulation of the present invention achieves lightness by showing a relatively small density of 0.025 g / cm ³ to 0.500 g / cm ³ .

On the other hand, the raw material composition may contain 5 to 50 parts by weight of a flame retardant based on 100 parts by weight of the resin mixture; And 1 to 5 parts by weight of a heat stabilizer.

If the content of the flame retardant is less than 5 parts by weight, the effect of addition of the flame retardant is insignificant. If the content of the flame retardant exceeds 50 parts by weight, the durability of the foamed heat insulating material may be deteriorated.

If the content of the heat stabilizer is less than 1 part by weight, the processability at the time of extrusion and foaming is lowered and the resin is decomposed to deteriorate the physical properties. When the amount is more than 5 parts by weight, The mechanical properties may be deteriorated.

Here, the flame retardant may be any one selected from the group consisting of antimony trioxide, decabromophenyl oxide, and magnesium hydroxide, or a mixture of two or more thereof.

The heat stabilizer may be any one selected from the group consisting of tin maleate, tin laurate, and powder tin maleate esters, or two or more of them.

Hereinafter, a method for producing an electron beam crosslinked polyvinyl chloride-based flame retardant foamed insulating material according to the present invention will be described.

First, a resin mixture comprising 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin, 10 to 100 parts by weight of chlorinated paraffin oil (CPO 5 to 50 parts by weight of a flame retardant, 1 to 5 parts by weight of a heat stabilizer, 5 to 50 parts by weight of a blowing agent, and 0.1 to 3 parts by weight of a foaming auxiliary are mixed to prepare a raw material composition (S1).

In this case, step (S1) may be performed through the following steps to prevent efficient mixing of raw materials and deterioration of physical properties of the product.

First, a resin mixture comprising 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin, 10 to 100 parts by weight of chlorinated paraffin oil (CPO ) And 1 to 5 parts by weight of a heat stabilizer are mixed at 70 to 150 캜 for 5 to 20 minutes. This mixing process can be performed in a wet kneader.

Thereafter, a first dispersion step in which 5 to 50 parts by weight of a flame retardant is added to the resultant product after the mixing step, based on 100 parts by weight of the resin mixture, is dispersed at 70 to 150 DEG C for 2 to 10 minutes.

Next, 5 to 50 parts by weight of the foaming agent and 0.1 to 3 parts by weight of the foaming auxiliary are added to the resultant product after the first dispersion step, based on 100 parts by weight of the resin mixture, and the second A dispersion step is performed.

At this time, the product after the second dispersion step may be produced in the form of a pellet so that it can be easily injected into the extruder.

On the other hand, the reason why the polyvinyl chloride resin, the chlorinated polyethylene resin and the chlorinated paraffin oil should satisfy the above-described numerical range is as described above.

When the foaming agent and the foaming auxiliary satisfy the above-described numerical ranges, foaming is sufficiently performed, and the physical properties of the product do not decrease.

Although various kinds of foaming agents are already known, they should be able to form fine and uniform bubbles and should be used so as to minimize the early decomposition which may occur during extrusion. Non-limiting examples of such foaming agents include inorganic foaming agents such as ammonium bicarbonate, sodium hydrogencarbonate, sodium borohydride, and the like; and azo compounds such as azodicarbonamide, N, N'-dinitrosopentamethylene tetramine Benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, toluenesulfonyl semicarbazide, oxybis (benzenesulfonylhydrazide) (P, P '), benzenesulfonyl hydrazide, -oxybis (benzenesulfonyl hydrazide)).

A cadmium compound, a calsium compound, a zinc compound, a magnesium compound, an iron compound, a copper compound and the like are used as the foaming auxiliary agent , And it is particularly preferable to use zinc oxide among the zinc compounds.

Subsequently, the raw material composition is introduced into an extruder and melt-extruded to produce an extruded sheet (S2).

The step (S2) is a step of extruding the raw material composition produced in the step (S1) into an extruded sheet having a predetermined width and thickness, and the extruded sheet is extruded by using a single extruder or an extruded sheet In order to further prevent premature foaming, a twin extruder, which is a twin extruder in which a foaming agent is introduced in a side feeding manner by using a separate screw, is used, and a cylinder having a screw inside and having a temperature of 90 to 140 ° C And a die having a temperature of 90 to 140 DEG C, the raw material composition is kneaded and extrusion-molded, thereby uniformly mixing the entire composition contained in the raw material composition prepared in the step (S1). When the temperature of the cylinder and the die is kept below 90 ° C, the resin mixture is slightly melted and the kneading property of the foam mixture is reduced. If the temperature is higher than 140 ° C, there arises a problem of premature decomposition of the foaming agent , It is preferable to maintain the temperature of the cylinder and the die of the extruder at 90 to 140 占 폚. At this time, it is apparent that the width and thickness of the extruded sheet can be variously adjusted according to the judgment of a person skilled in the art.

Subsequently, the extruded sheet is irradiated with an electron beam to crosslink the resin mixture (S3).

Here, the crosslinking method through electron beam irradiation is more environment-friendly than the conventional chemical crosslinking method, and is excellent in economy and further securing process stability.

At this time, it is preferable to irradiate the accelerated electron beam with a voltage of 100 to 1,500 kV and an electron dose of 0.5 to 10 Mrad. The control of the cross-linking voltage may be appropriately adjusted according to the thickness of the extruded sheet obtained in the step (S2) And the crosslinking electron dose can be appropriately adjusted according to the density and physical properties of the previously introduced blowing agent.

If the voltage is less than 100 kV, the extrusion sheet will not be crosslinked to a sufficient depth. If the voltage is more than 1,500 kV, economical efficiency and safety are deteriorated due to energy waste and radiation leakage due to excessive irradiation amount.

If the electron dose is less than 0.5 Mrad, sufficient crosslinking is not achieved with respect to the extruded sheet, and subsequent foaming is not properly performed. If the electron dose exceeds 10 Mrad, the crosslinking reaction becomes supersaturated This will lead to serious problems in subsequent foaming and lowering of economic efficiency.

In the crosslinking method using electron beam irradiation conducted under the above-described conditions, accelerated electron beams are irradiated to an extruded sheet, which is an object of crosslinking, to remove hydrogen contained in the extruded sheet, thereby generating radicals in the resin mixture. The radicals thus formed are highly reactive and are characterized in that a crosslinking reaction is induced in the resin mixture.

Subsequently, the product obtained after the step (S3) is heated to foam the foaming agent to form a foam (S4).

In the step (S4), the result of the step (S3) is heated to a temperature of 150 to 250 ° C to foam the foaming agent to form a foam. When the temperature is lower than 150 ° C, the foaming agent is activated If the temperature is higher than 250 ° C, the foaming agent decomposes and problems occur in product formation.

At this time, the step (S4) is carried out by any one method selected from a horizontal foaming method for horizontally installing the foaming furnace, a vertical foaming method for vertically installing the foaming furnace, and a foaming method for the foaming using a liquid-phase sludge as a heat transfer medium .

At this time, all of the three foaming methods are performed at normal pressure, and are classified according to the method of installing the foaming furnace and the heat transfer medium. In the first horizontal foaming method, the foaming furnace is installed horizontally so that the foams are produced horizontally at the time of foaming, and all processes proceed horizontally. Such a horizontal foaming method is advantageous in that the physical properties in the longitudinal direction and the width direction are small because the expansion ratio in the longitudinal direction is small at the time of foaming since there is little influence by the gravity in the arrangement and the process progress of the foaming furnace. In the second vertical foaming method, the foaming furnace is vertically installed, and the resulting mother sheet is foamed while descending. Such a vertical foaming method is advantageous in appearance because it is foamed in air at the time of foaming, and the deviation in the width direction is small. In the third method, the liquid phase sulphate is used as a heat transfer medium. In the third method, the liquid phase sulphate is used. However, unlike the vertical firing method, the air is not used as a heat transfer material, The heat transfer effect is excellent and the foaming can be performed uniformly on the sheet. Especially, since the physical property deviation in the longitudinal direction and the width direction is very small as compared with the foam product produced by the above-described horizontal or vertical foaming method, And the characteristic is evaluated excellent.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

One. Example  - Preparation of resin mixture

The mixture ratio of polyvinyl chloride (PVC) resin and chlorinated polyethylene (CPE) resin was adjusted by mill roll at a temperature of 140 ° C for 15 minutes to prepare resin mixtures. The limit oxygen index and the specimen state are shown in Table 1 below.

division Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 PVC weight part 70 60 50 40 30 CPE weight part 30 40 50 60 70 Sum 100 100 100 100 100 Marginal oxygen index 38 36 34 31 29 Psalm state △ ○ ◎ ○ △

(Specimen status indication: ⊚ very good, good good, △ fair, poor)

The samples 1 to 5 according to the respective formulations were measured to have a limit oxygen index exceeding 28, so that there was no problem in flame retardancy. However, the following experiment was conducted using Sample 3 having the best specimen condition.

2. Example  - Electron beam bridge Polyvinyl chloride system  Manufacture of flame retardant foam insulation

(One) Example  One

100 parts by weight of a resin mixture having the composition of the sample 3, 50 parts by weight of chlorinated paraffin oil (CPO) as a plasticizer and 2 parts by weight of tin maleate as a heat stabilizer were mixed in a wet kneader at 70 캜 for 10 minutes .

Thereafter, 10 parts by weight of magnesium hydroxide was added as a flame retardant and dispersed at 90 DEG C for 5 minutes. Subsequently, 25 parts by weight of azodicarbonamide as a foaming agent and 1 part by weight of zinc oxide as a foaming assistant were added and dispersed at 110 DEG C for 5 minutes And then pelletized.

Subsequently, the pelletized foam raw material composition was put into a single extruder maintained at 120 ° C, and melt extruded to produce an extruded sheet. Then, a resin mixture was crosslinked by irradiating a voltage of 500 kV and an electron beam of 2.0 Mrad Then, it was charged into an oven maintained at 200 ° C and foamed to produce a foamed insulating material.

(2) Example  2

A foaming insulation material was prepared in the same manner as in Example 1, except that 10 parts by weight of magnesium hydroxide, 2 parts by weight of antimony trioxide and 6 parts by weight of decabromophenyl oxide were added as flame retardants.

(3) Example  3

A foaming insulation material was prepared in the same manner as in Example 1, except that 10 parts by weight of magnesium hydroxide, 3 parts by weight of antimony trioxide and 9 parts by weight of decabromophenyl oxide were added as flame retardants.

(4) Example  4

A foaming insulation material was prepared in the same manner as in Example 1, except that 10 parts by weight of magnesium hydroxide, 4 parts by weight of antimony trioxide and 16 parts by weight of decabromophenyl oxide were added as flame retardants.

(5) Example  5

Except that 10 parts by weight of magnesium hydroxide, 3 parts by weight of antimony trioxide and 9 parts by weight of decabromophenyl oxide were added as the flame retardant and 10 parts by weight of azodicarbonamide was added as the foaming agent. A heat insulating material was prepared.

(6) Example  6

Except that 10 parts by weight of magnesium hydroxide, 3 parts by weight of antimony trioxide and 9 parts by weight of decabromophenyl oxide were added as the flame retarder and 20 parts by weight of azodicarbonamide was added as the foaming agent. A heat insulating material was prepared.

(7) Example  7

Except that 10 parts by weight of magnesium hydroxide, 3 parts by weight of antimony trioxide and 9 parts by weight of decabromophenyl oxide were added as flame retardants and 30 parts by weight of azodicarbonamide was added as the foaming agent. A heat insulating material was prepared.

The compositions of the foamed insulating materials prepared in Examples 1 to 7 are summarized in Table 2, and the density, the limiting oxygen index, the thermal conductivity and the product state of each example are summarized in Table 3 below.

Compound Kinds Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Suzy PVC 50 50 50 50 50 50 50 CPE 50 50 50 50 50 50 50 Plasticizer CPO 50 50 50 50 50 50 50 Flame retardant Antimony trioxide - 2 3 4 3 3 3 Decabromobiphenyl oxide - 6 9 16 9 9 9 Magnesium hydroxide 10 10 10 10 10 10 10 Heat stabilizer Comment Mal Rate 2 2 2 2 2 2 2 blowing agent Azodicarbonamide 25 25 25 25 10 20 30 Foaming auxiliary zinc oxide One One One One One One One Gross weight 188 196 200 208 185 195 205

characteristic Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Density (g / cm ³⁾ 0.05 0.05 0.05 0.06 0.10 0.07 0.04 Marginal oxygen index 28 30 32 34 34 34 34 Thermal conductivity (W / mK) 0.035 0.035 0.035 0.035 0.040 0.036 0.034 Product Status Good Good Good Good Good Good Good

As shown in Table 3, all of the foamed insulation materials prepared in the Examples were manufactured in a good condition, exhibited proper density and thermal conductivity, and the limit oxygen index was measured to be 28 or more. Satisfaction.

Particularly, in Examples 2 to 4, the foaming insulation material was prepared by varying the content of the flame retardant agent. However, as the amount of the flame retardant agent was increased, the thermal conductivity of the product was not significantly changed. However, since the limit oxygen index was increased, Could know.

In Examples 5 to 7, the foaming insulation material was prepared by varying the amount of the foaming agent only. As the amount of foaming agent was increased, the density of the product was decreased, but the thermal conductivity was decreased and the adiabatic property was improved.

3. Comparative Example  - Electron beam bridge Polyvinyl chloride system  Manufacture of flame retardant foam insulation

(One) Comparative Example  One

100 parts by weight of a polyvinyl chloride (PVC) resin, 40 parts by weight of chlorinated paraffin oil (CPO) as a plasticizer and 2 parts by weight of tin maleate as a heat stabilizer were mixed in a wet kneader at 70 캜 for 10 minutes.

Thereafter, 10 parts by weight of magnesium hydroxide, 3 parts by weight of antimony trioxide and 9 parts by weight of decabromophenyl oxide as flame retardants were added and dispersed at 90 DEG C for 5 minutes. Subsequently, 25 parts by weight of azodicarbonamide as a foaming agent, , 1 part by weight of zinc oxide was added and dispersed at 110 DEG C for 5 minutes and then pelletized.

Subsequently, the pelletized foam raw material composition was put into a single extruder maintained at 120 ° C, and melt extruded to produce an extruded sheet. Then, a resin mixture was crosslinked by irradiating a voltage of 500 kV and an electron beam of 2.0 Mrad Then, it was charged into an oven maintained at 200 ° C and foamed to produce a foamed insulating material.

(2) Comparative Example  2

Instead of 100 parts by weight of a polyvinyl chloride (PVC) resin, 100 parts by weight of a resin mixture having the composition of the above-mentioned Sample 3 was used and 50 parts by weight of diisononyl phthalate (DINP) was mixed in place of 40 parts by weight of chlorinated paraffin oil as the plasticizer , A foamed insulating material was prepared in the same manner as in Comparative Example 1.

(3) Comparative Example  3

Except that 100 parts by weight of the resin mixture having the compounding of the sample 3 was used instead of 100 parts by weight of the polyvinyl chloride (PVC) resin and 50 parts by weight of dioctyl phthalate (DOP) was mixed instead of 40 parts by weight of chlorinated paraffin oil as the plasticizer And a foaming insulation material was prepared in the same manner as in Comparative Example 1.

The compositions of the foamed insulation materials prepared in Comparative Examples 1 to 3 are summarized in Table 4, and the density, the limiting oxygen index, the thermal conductivity and the product state of each Comparative Example are summarized in Table 5 below.

Compound Kinds Comparative Example 1 Comparative Example 2 Comparative Example 3 Suzy PVC 100 50 50 CPE - 50 50 Plasticizer CPO 40 - - DINP - 50 - DOP - - 50 Flame retardant Antimony trioxide 3 3 3 Decabromobiphenyl oxide 9 9 9 Magnesium hydroxide 10 10 10 Heat stabilizer Comment Mal Rate 2 2 2 blowing agent Azodicarbonamide 25 25 25 Foaming auxiliary zinc oxide One One One Gross weight 190 200 200

characteristic Comparative Example 1 Comparative Example 2 Comparative Example 3 Density (g / cm ³⁾ - 0.06 0.06 Marginal oxygen index - 25 24 Thermal conductivity (W / mK) - 0.050 0.050 Product Status Lack of plasticity, no crosslinking, no foaming Good plasticity, a large amount of gas generated at the time of foaming, Good plasticity, a large amount of gas generated at the time of foaming,

As shown in Table 5, when polyvinyl chloride was 100% as in Comparative Example 1, crosslinking and foaming were not properly performed.

When the phthalate system was used as a plasticizer instead of the chlorinated paraffin oil as in the case of Comparative Example 2 and Comparative Example 3, plasticity was good, but a large amount of gas was generated at the time of foaming. In particular, .

It should be noted that the embodiments of the present invention disclosed herein are merely examples of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

Claims (15)

30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin; And
And 10 to 100 parts by weight of chlorinated paraffin oil (CPO) based on 100 parts by weight of the resin mixture is extrusion-foam-molded. The method according to claim 1,
The chlorinated paraffin oil (CPO) is 20 to 80 parts by weight based on 100 parts by weight of the resin mixture. The method according to claim 1,
The electron beam cross-linked polyvinyl chloride-based flame retardant foamed insulation material according to claim 1, wherein the electron beam cross-linked polyvinyl chloride-based fire retardant foamed insulation material has a critical oxygen index of 28 or more. The method according to claim 1,
The electron beam cross-linked polyvinyl chloride type density of the foam insulation is fire retardant, an electron beam cross-linked polyvinyl chloride-based flame-retardant foam insulation, characterized in that 0.025 g / cm ³ to 0.500 g / cm ^3. The method according to claim 1,
Crosslinked polyvinyl chloride-based flame-retardant foamed thermal insulating material has a thermal conductivity of 0.04 W / mK or less. The method according to claim 1,
Wherein the raw material composition contains, based on 100 parts by weight of the resin mixture, 5 to 50 parts by weight of a flame retardant; And 1 to 5 parts by weight of a heat stabilizer, based on 100 parts by weight of the total amount of the heat-resistant polyvinyl chloride-based flame retardant foamed insulation material. The method according to claim 6,
Wherein said flame retardant is any one selected from the group consisting of antimony trioxide, decabromophenyl oxide, and magnesium hydroxide, or a mixture of two or more thereof. The method according to claim 6,
Characterized in that the heat stabilizer is at least one selected from the group consisting of tin maleate, tin laurate and powder tin maleate ester, or at least two kinds of organic stabilizers based on the same, wherein the heat stabilizer is an electronically crosslinked polyvinyl chloride- . (S1) 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin, 10 to 100 parts by weight of a chlorinated paraffin oil 5 to 50 parts by weight of a flame retardant, 1 to 5 parts by weight of a heat stabilizer, 5 to 50 parts by weight of a blowing agent and 0.1 to 3 parts by weight of a foaming auxiliary to prepare a raw material composition;
(S2) adding the raw material composition to an extruder and melt extruding the extruded material to produce an extruded sheet;
(S3) crosslinking the resin mixture by irradiating the extruded sheet with an electron beam; And
(S4) heating the resultant product obtained in the step (S3) and foaming the foaming agent to form a foamed product. 10. The method of claim 9,
Wherein the step (S1) comprises: mixing a resin mixture comprising 30 to 70 parts by weight of a polyvinyl chloride (PVC) resin and 30 to 70 parts by weight of a chlorinated polyethylene (CPE) resin, 10 to 100 parts by weight 1 to 5 parts by weight of chlorinated paraffin oil (CPO) and heat stabilizer at 70 to 150 DEG C for 5 to 20 minutes;
A first dispersion step in which 5 to 50 parts by weight of a flame retardant is added to the resulting product after the mixing step based on 100 parts by weight of the resin mixture and the dispersion is carried out at 70 to 150 DEG C for 2 to 10 minutes; And
5 to 50 parts by weight of a foaming agent and 0.1 to 3 parts by weight of a foaming auxiliary are added to the resulting product after the first dispersion step based on 100 parts by weight of the resin mixture and then dispersed for 2 to 10 minutes at 70 to 150 캜 Based on the total weight of the crosslinked polyvinyl chloride-based fire retardant foamed insulation material. 10. The method of claim 9,
The foaming agent may be selected from the group consisting of ammonium bicarbonate, sodium hydrogencarbonate, sodium borohydride, azodicarbonamide, dinitrosopentamethylenetetramine, benzenesulfonylhydrazide, toluenesulfonylhydrazide, toluenesulfonylsemicarbazide and (Benzenesulfonyl hydrazide), or a mixture of two or more thereof. [Claim 6] The method according to claim 1, wherein the heat-resistant polyvinyl chloride resin is a polyvinyl chloride resin. 10. The method of claim 9,
Wherein the foaming aid is any one selected from the group consisting of a cadmium compound, a calcium compound, a zinc compound, a magnesium compound, an iron compound and a copper compound, or a mixture of two or more thereof, Method of manufacturing insulation. 10. The method of claim 9,
Wherein the extruder is a single extruder or a twin extruder and the extrusion temperature is maintained at 90 to 140 占 폚. 10. The method of claim 9,
Wherein the step (S3) comprises irradiating accelerated electron beams at a voltage of 100 to 1,500 kV and an electron dose of 0.5 to 10 Mrad. 10. The method of claim 9,
Wherein the step (S4) is performed by heating the result of the step (S3) and subsequent steps to a temperature of 150 to 250 ° C to foam the foaming agent to form a foamed product. .