JP2002265654A - Flame-retardant polyolefin foam composition and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flame-retardant polyolefin foam composition having excellent flame retardance, mechanical properties and environmental affinity and to provide a method for producing the flame-retardant polyolefin foam composition. SOLUTION: This flame-retardant polyolefin foam composition comprises a nitrile rubber and polyvinyl chloride as a resin component and a flame retardant, a plasticizer, a foaming agent and a stabilizer as additives and the resin component is composed of 10-50 wt.% of the nitrile rubber, 30-50 wt.% of the polyvinyl chloride and 20-40 wt.% of a chlorinated polyethylene or polyethylene. The flame retardant is composed of 5-20 wt.% of Al(OH)3 , 0-5 wt.% of magnesium silicate, 40-80 wt.% of Mg(OH)2 , 5-10 wt.% of Sb2 O3 and 0-10 wt.% of a chlorinated paraffin. The flame retardant is contained in an amount of 0.55-1 wt.% based on 1 pt.wt. of the resin component and a usual additive is contained therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant polyolefin foam composition and a method for producing the same, and more particularly, to blending a polyolefin-based resin and a rubber-based resin to provide basic flame-retardant properties, It is a composition produced by mixing chlorine-based flame retardants, blowing agents, vulcanizing agents and other additives, and has excellent flame retardancy and mechanical properties. When used in a wide range of applications, such as materials, automobile parts, sports goods, and other communal products, environmental friendliness, stability, flame retardancy, etc. are secured, and the improved composition is very useful. The present invention relates to a flame-retardant polyolefin foam composition and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, foams have been used for building, construction, automobiles,
BACKGROUND ART Molding compositions widely used in sports equipment and other fields, and in view of environmental impact and stability, flame retardancy is required by various regulations in various countries in the world and in Japan. However, conventional products
Because of its poor flame retardancy and the use of halogen-based flame retardants, which are highly harmful to the human body, their application range has been reduced.

[0003] Conventional flame-retardant polyolefin foams include V-0 grade or B-grade according to ASTM-D-2863.
In the case of a flame-retardant foam of grade "0" according to S476, the composition is such that a flame retardant and other additives are added to a resin blended with nitrile rubber (NBR) and polyvinyl chloride (PVC). What is manufactured is disclosed.
(U.S. Pat. No. 5,187,203, Ronald
S. Lenox, Lancaster, Pa; Kim
S. Boyd, Quincy, Mass. ; Will
iam S.A. Youth, Jr. , Landisvi
lle, Pa, Feb. 16 1993, No. 4, 24
No. 5,055 Wayne E.P. Smith, Washi
ngon Boro, Pa, Jan. 13, 1981,
No. 3,993,607, David M. Flor
ence, Lancaster, Pa, Nov. 23,
1976)

[0004] Such a conventional flame-retardant composition has a slight difference depending on the specification, but one of the compositions is exemplified as a typical example. 85 parts by weight or 1 to 20
0 parts by weight, plasticizer 10 to 100 parts by weight, flame retardant 100 parts by weight (iron oxide 5 to 75 parts by weight) / lubricant 10 to 85 parts by weight, stabilizer 0.1 to 10 parts by weight, foaming agent 10 20 parts by weight, sulfur 2.5 parts by weight, zinc oxide (ZnO) 5 parts by weight, stearic acid 2.1 parts by weight, benzothial disulfide (MBTS; benzothial disul)
0.8 parts by weight, tetramethyldilammonosulfide (Monex; tetraethylthi)
nlammonosulfide) 0.4 parts by weight.

[0005]

Although such a conventional polyolefin foam composition has a certain degree of flame retardancy, it has poor physical properties such as mechanical properties and is particularly environmentally friendly. It cannot be said that it is a safe substance, and there is much room for improvement.

Accordingly, an object of the present invention is to provide a resin composition which has been conventionally used in order to improve the problems in the conventional flame-retardant polyolefin foam composition.
Nitrile rubber and polyvinyl chloride are used as they are, but unlike before, a mixture of chlorinated polyethylene (CPE) or polyethylene (PE) is used, and a series of compositions such as the composition of a flame retardant and other additives. Is to provide a foam composition which is superior in flame retardancy and mechanical properties as compared with the conventional composition and is environmentally friendly.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a nitrile rubber, polyvinyl chloride and chlorinated polyethylene or polyethylene are contained as resin components, and a flame retardant, a plasticizer is used as an additive. In a flame-retardant polyolefin foam composition containing an agent, a foaming agent and a stabilizer, the resin component is 10 to 50% by weight of nitrile rubber, 30 to 50% by weight of polyvinyl chloride, and 20 to 50% by weight of chlorinated polyethylene or polyethylene. 40% by weight, and the flame retardant is 5-20% by weight of Al (OH) ₃ , 0-20% by weight of magnesium silicate, Mg (OH) _2
40-80% by weight, is composed of _Sb 2 O 3 5 to 10% by weight and chlorinated paraffins 0-10% by weight, wherein
The present invention provides a flame-retardant polyolefin foam composition containing 0.55 to 1% by weight of a flame retardant based on 1 part by weight of the resin component and further containing ordinary additives, and a method for producing the same. Is done.

[0008] The foam composition according to the present invention comprises a mixture of a resin and a flame retardant, as additives, a plasticizer of 0 to 50% by weight, a stabilizer of 0 to 15% by weight, and a foaming agent. The composition containing 10 to 40% by weight
Mix at ~ 120 ° C and add 0-2.5% by weight of vulcanizing agent
And 0 to 1% by weight of a vulcanization accelerator, and then extruded or injected.

One example of the composition of the composition according to the present invention is as follows.
Specifically, the resin component is a nitrile rubber 10 to 50.
Wt%, PVC 30-50 wt%, and chlorine
Polyethylene or polyethylene at 20-40% by weight
And the flame retardant is Al (OH)₃5-30% by weight,
Magnesium silicate 0-5% by weight, Mg (OH) ₂
40-80% by weight, Sb₂O₃5-10% by weight and chlorine
It is composed of fluorinated paraffin 0 to 10% by weight. This tree
0.55 to 1% by weight of the flame retardant per 1 part by weight of the fat component
Contained, where plasticizer 0-50% by weight, stable
0-15% by weight of vulcanizing agent, 0-2.5% by weight of vulcanizing agent, accelerated vulcanization
2-mercapto benzothiazole (M) as an enhancer,
Dibenzothiazyl disulfide (DM) and Zn
-Dimethyl dithiocarbamate (PZ) is 0 each
-1% by weight, foaming agent 10-40% by weight, foaming aid 0-2
Wt%, heat transfer enhancer 0-5 wt%, external release agent 0
2.5% by weight, internal release agent 0-4% by weight, filling agent 0-1
0% by weight.

[0010] The resin composition according to the present invention comprises nitrile rubber, polyvinyl chloride, chlorinated polyethylene or polyethylene. In particular, the chlorinated polyethylene preferably used in the present invention is a polyethylene-based resin in which some hydrogen atoms of polyethylene are replaced by chlorine which delays ignition and combustion, and has a basic flame retardancy. The higher the chlorine content, the higher the flame resistance, the better the impact resistance, the ozone resistance, the weather resistance, the aging resistance, etc., and the good compatibility with polyvinyl chloride. It has the property of being.

Further, by blending nitrile rubber with polyvinyl chloride and chlorinated polyethylene which basically have flame retardancy, flame retardancy can be imparted by an improved method as compared with conventional ones. In addition, the addition of inorganic and chlorine-based flame retardants has the effect of doubling the flame retardancy. The flame-retardant polyolefin foam composition according to the present invention includes not only a case where three of the four components are used, but also a case where two or all of the four components are used.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Generally, a halogen compound fundamentally stabilizes radicals generated from a gaseous phase and exerts a flame-retardant effect. The mechanism is inferred as the following chemical reaction. ing.

[0013] (Equation 1) HO · + HX → HOH · X · ( prohibition reaction) X · + RH → HX + R · ( regeneration reaction) (stop the chain reaction) XO · + · OH → HX + O 2 ( active O · and · OH reduce the concentration, when the chain reaction is stopped flame retardant effect) X · + O · + M → XO · + M · X 2 + O · → XO · + X · ( decomposition, generates nonflammable gases, blocking the _{O 2} Effect) O ・ + ・ OX → O ₂ + X ・

In the above formula (1), at the time of combustion, activated radicals such as .OH radicals generate heat through a chemical reaction, and the latent heat generated at this time affects the combustion of surrounding flammable substances. Acts as a required energy source.

On the other hand, the flame retardant reduces the concentration of the active radicals O. and .OH and stops the chain reaction to provide a flame retardant effect, as in the mechanism described above. Breaking the X bond has the effect of reducing the heat of combustion of the combustible material by the endothermic reaction. Further, at the time of decomposition, there is also an effect that oxygen is cut off by generating a nonflammable gas. The practical flame retardant effect is that HX will impart and react and be converted to X radicals, a low energy source.

Further, the halogen-containing flame retardant exhibits a flame-retardant effect even in a solid state, and HX acts as an oxidation catalyst for combustible substances, and the oxidized substances are formed into a ring structure, and as a result, the char is a carbon compound. (Char). The carbon compound produced in this way blocks oxygen and latent heat, and functions so that the combustible substance is in a state below the combustion region.

In the present invention, an inorganic substance is mainly used as a flame retardant, and a small amount of a chlorine-based flame retardant is preferably used as a halogen-based substance. As the inorganic flame retardant, aluminum hydroxide, antimony oxide, magnesium hydroxide and a boron-containing compound can be used.

The inorganic flame retardant, unlike the organic flame retardant, is decomposed without being volatilized by heat to form H ₂ O, C
It emits non-flammable gases such as O ₂ , SO ₂ , and HCI, most of which are endothermic reactions.

In the gas phase, the combustible gas is diluted and applied to the surface of the plastic to prevent oxygen from approaching. At the same time, it has the effect of reducing the cooling of plastic and the generation of pyrolysis water through an endothermic reaction on the solid surface. For example, aluminum hydroxide and magnesium hydroxide generate water after being decomposed as described below, and at this time, a large amount of heat is absorbed to impart flame retardancy.

(Formula 2) 2Al (OH) ₃ + heat → Al ₂ O ₃ + 3H ₂ O-298 KJ / mol Mg (OH) ₂ + heat → MgO + H ₂ O-328 KJ / mol

The antimony oxide includes antimony trioxide and antimony pentoxide, which are not used as such, but are used as an auxiliary agent which shows the effect of increasing the flame retardancy of the halogen-containing flame retardant. The mechanism is inferred as follows.

Sb produced in each of the following step reactions
Cl ₃ has an effect of lowering the temperature of the plastic through an endothermic reaction, and acts as a radical interceptor together with HCl and HBr. In addition, SbCl ₃ and Sb
Some observers believe that increasing the time during which both OCLs act as radical interceptors by lowering the halogen emission rate in the combustion region will provide a flame retardant effect.

Note that the heavy gas generated is generated on the solid surface.
Because it is surrounded, it blocks the approach of oxygen and reduces the flame retardant effect.
Show. (Equation 3) Sb₂O₃(Maintain ~ 250 ° C) → 2SbOCl + H₂O 5 SCOCl (maintained at 245 to 280 ° C) → Sb₄O₅Cl + SbCl₃  4Sb₄O₅Cl₂(Maintain 410-475 ° C) → 5Sb₃O₄Cl + SbCl ₃ ３ 3Sb₃O₄Cl (maintained at 475-565 ° C) → 4Sb₂O₃+ SbCl₃↑ Sb₂O₃(S) (maintained at 685 ° C) → Sb₂O₃(I)

In the present invention, a nitrile rubber is used as the resin. Preferably, a resin having an acrylonitrile (AN) content of 28 to 35% is used as a basic resin, It is possible to blend a polyvinyl chloride (PVC) with a chlorinated polyethylene, preferably a chlorinated polyethylene having a chlorine content of 36 to 42%, by using a flame-retardant resin mixture. Good for giving.

In the present invention, the use of a halogen-based flame retardant is excluded in order to produce an environment-friendly composition in consideration of the effect on the environment and processability. , AI (OH) 3, Mg, an inorganic flame retardant
The main use of (OH) 2, Sb2O3, chlorinated paraffin (Chlorinated Parf) which is a chlorine-based flame retardant
It is preferable to use a small amount of affin) for the flame retardant effect while considering the environment. In the present invention, all of the above five components can be used as a flame retardant, or one or more of them can be selected and used.

As the foaming agent, azodicarbonamides (7000 MC, 5000
F, 3000F, ADCA) is preferred, and a urea-based foaming aid (trade name "Cellex-A") is used as a foaming aid in order to control foaming properties and temperature that affect processability and productivity. ), And ZnO can be preferably used as a heat transfer promoter.

In the present invention, sulfur is used as a vulcanizing agent, and a vulcanization accelerator is used in consideration of a vulcanization accelerating effect, scorch resistance, aging resistance, activation temperature, dispersibility, contamination, and the like. , Thiazoles with relatively fast scorch 2
-Mercapto benzothiazole (M) and dibenzothiazyl disulfide (D
M), dithionates, scorch and vulcanized Z
It is preferable to use n-dimethyldithiocarbamate (PZ) in an appropriate ratio as described above.

As the stabilizer, a Ba—Zn-based stabilizer is used in consideration of the foaming speed and the effect on the uniform cells due to the use of a large amount of filler. 806F "and" BZ-119 "can be preferably used.

The plasticizer is selected from diethylhexyl phthalate (DOP) in consideration of compatibility with resin, processability and foaming property.
It is preferable to use 2,2,4-trimethyl-1,2-dihydroquinone (Kumanox RD) as the antioxidant in consideration of the effect on vulcanization.

The internal release agent is polyethylene wax (LC-102N) as a rubber processing improver, the external release agent is stearic acid in consideration of extrudability, etc., and the filler is hue and light. It is preferable to use carbon black (N550FEF) in consideration of oxidation prevention, reinforcing effect, cost reduction, and the like.

[0031]

EXAMPLES Hereinafter, the flame-retardant polyolefin foam composition according to the present invention will be described with reference to the following examples. Such examples of the present invention illustrate examples. It does not limit the invention. In addition, the percentage (%) showing the content of the composition in the examples.
Means% by weight.

In the examples, NBR means nitrile rubber, PVC means polyvinyl chloride, PE means polyethylene, CPE means chlorinated polyethylene, and DOP means diethylhexyl phthalate.

Example 1 Production of NBR / PVC, PE Blend Product In this example, NBR / PVC, PE
The thermal and kinetic behaviors of the PE blends by composition ratio, temperature and time were observed and examined in relation to the morphological observation at the phase interface (morphology).

The resin composition ratios of the samples 1, 2, 3, 4 in Table 1
NBR / PVC = 5/5, 3/7, or 7
/ 3 Wt%, NBR / PE = 5/5 Wt%, and the blend was made at a temperature of 120 ° C., an RPM of 50, and a time of 40 min using a Rheomixer (HAAKE). In addition, the change in melting point, the change in torque (Torque), and the degree of blending according to the composition ratio and time were observed in units of 10 minutes, and were examined in relation to morphology.

For observation of the morphology, a test piece was produced by using a mini-max molder (Mini-maxMol).
der: Csi-183 MMV) and a temperature of 85
1cm (length) x 2.5c at ℃, Rs0, time 5min
It was fabricated to a size of m (width) x 0.3 cm (width), and for morphological examination, the fracture surface was observed using SEM (JEOL JSM-840A).

As a result, in the case of the NBR / PVC blend, the PVC particles decrease with time, and the particles are dispersed to a size of about 0.1 to 0.2 μm after 30 minutes. , A uniform state was confirmed, and the melting point was confirmed to rise to 140 ° C. In addition, NBR /
In the case of PE blend, it was confirmed that the blend was good even after elapse of 10 minutes and the melting point was increased to 125 ° C.

The above composition and results are shown in Table 1 and FIG.
(Samples 1, 2, 3, and 4).

[Table 1]

Example 2 Production of NBR / PVC / CPE Blend Product NBR / PVC / C according to this example
In the case of PE blends as well, the thermal and kinetic behavior with composition ratio, temperature and time were investigated, and the morphology at the phase interface was examined in relation to the behavior.

The composition ratio of the resin is shown in Tables 7 and 8
NBR / PVC / CPE = 1/1 or 0.8 or 0.6 / 0.2 to 0.6 Wt% as shown in １２12, and the fabrication and morphological investigation of the blends and test pieces were conducted using the NBR / P
The same as in the case of the VC / PE blend.

As a result, when NBR / PVC = 1/1 or 0.8 or 0.6 Wt%, the change in compatibility is clearly shown by the content of CPE.
Uniform characteristics were exhibited within the range of 30 Wt%.

The compositions and results are shown in Table 1 above and in FIGS. 2 (samples 5, 6, 7), 3 (samples 8, 9, 10) and 4 (samples 11, 12).

[Table 2]

[0042]

[Table 3]

Example 3 A flame-retardant polyolefin foam composition according to this example is manufactured in the same manner as in Table 2 above, using the composition of sample 1 in Example 1. The blend is R
The temperature was 120 ° C., the RPM was 50, and the time was 4 without adding the vulcanization and the vulcanization accelerator by using a hem mixer (HAAKE).
After 0 min, vulcanization and a vulcanization accelerator were added, and the reaction was performed at a temperature of 70 ° C., an RPM of 50 and a time of 10 min.

The extrusion was performed using a minimax molder (C
si-183MMV), temperature 80 ° C, Rs5, time 5m
in, and vulcanization is performed under hot-press (Hot-Press;
Carver) at a temperature of 130 ° C. for a time of 10 min.

In the foaming process, heating and pressurizing (Carve
Under r), a method of raising the temperature from 130 ° C. to 250 ° C. and a method of performing the reaction at a temperature of 230 ° C. for 2 to 3 minutes were performed.

In the investigation of foamability, the surface condition after foaming, the foaming ratio, the cell structure, and the like were examined. Investigation of flame retardancy
ASTM-D-286 at LOI (Atlas) test
The size of the test piece shall be 6.5 ± 0.5m based on No.3.
m, thickness 2.0 ± 0.2 mm, length 7.0-150 mm, and oxygen index (Oxygen Index) was measured while arbitrarily adjusting the injection amounts of oxygen and nitrogen.
The morphological survey was performed by SEM (JEOL JSM-840).
The fracture surface of the test piece was observed using M).

As a result, foaming occurs in the temperature range of 138 to 170 ° C., and the required time is about 5 minutes and 40 seconds.
It was confirmed that the surface was soft, the cell structure was uniform, and the foaming ratio was 91.4% (about twice) in the radial direction. As a result of the LOI test, the oxygen index was 3
1.3. Imported commercial product (manufactured by Armstrong)
It was confirmed that it was slightly inferior to 5. Table 4 shows the results of the physical property measurement relating to this.

[0048]

[Table 4] Flame retardant (Al / MS / Mg / Sb / CP): AI (O
H) ₃ , magnesium silicate, Mg (OH) ₂ , S
b ₂ 0 _3, chlorinated paraffin, P / B-A (DOP / 5
000F): plasticizer / foaming agent

Example 4 In this example, a flame-retardant polyolefin foam composition was prepared with the same composition as in Table 2 with respect to Samples 2 and 3 of Example 1, but by the above test. Based on the clarified composition and processing conditions, the content of the foaming agent, foaming aid, and plasticizer is adjusted with emphasis on foamability.

Further, the type and content of the flame retardant were adjusted with emphasis on flame retardancy. The composition ratios in this regard are as shown in Table 4 above, and the blending, extrusion and vulcanization / foaming, and foaming, flame retardancy and morphological investigations were the same as for sample 1.

As a result, Samples 2 and 3 were used to confirm the effects of foaming and the change in the contents of foaming aids and plasticizers on foaming properties and flame retardancy. In the case of the sample 2 having a large number of cells, foaming occurs in the temperature range of 177 to 182 ° C., and the surface condition is not good, but the cell structure is uniform, and the foaming rate is about 150%, and foaming occurs about 2.5 times. It was confirmed that.

Sample 3 having a relatively large content of plasticizer was used.
In the case of, foaming occurs in the temperature range of 177 to 195 ° C,
It turns out that the surface is soft and the cell structure is uniform.
It was confirmed that foaming of about 3.5 times occurred at a foaming ratio of about 250%.

As a result of the LOI test, it was confirmed that the oxygen index of sample 2 was 31.3, which was higher than that of sample 3 28.3. This appears to be due to differences in plasticizer content. This has clarified the proper blending and processing conditions for the foaming degree of about 2.5 to 3.5 times and the oxygen index of 28.3 to 31.1.

(Example 5) Sample 4 according to Examples 1 and 2
In Nos. To 18, the focus was on flame retardancy and foamability based on the above test results. That is, flame retardancy is achieved by increasing the oxygen index, and foaming is achieved by increasing the degree of foaming. The composition ratio is as shown in Table 4 above.

In this example, the resin composition ratio, the types and contents of the flame retardant and the blowing agent were adjusted. The blend is Rh
After the vulcanization and vulcanization accelerator are added to the mixture at a temperature of 114 to 118 ° C. (melting point does not exceed 125 ° C.), an RPM of 50, and a time of 40 min without adding a vulcanization and vulcanization accelerator by using an eomixer (HAAKE). Add, temperature 62-67 ° C
(With the melting point not exceeding 80 ° C taking into account the vulcanization temperature),
The test was performed at 50 RPM for 10 minutes.

The extrusion was performed using a minimax molder (C
si-183MMV) at a temperature of 70 to 100 ° C, R
s5, time 2-5 min, vulcanization / foaming is carried out under heating and pressure (Carver) by raising the temperature from 130 ° C. to 250 ° C. and at 230 ° C. for 2 to 3 min. I went with two. The foamability, flame retardancy and morphological investigations were the same as in the above test method.

As a result, among the samples 4 to 13, the samples 2 and
Sample No. 9 was not good in surface condition due to over-foaming, but all others were good in surface condition and cell condition.
It was confirmed to have about twice the degree of foaming.

The oxygen index according to ASTM-D-2863 was 3 in Samples 1, 2, 3, and 9, respectively.
1.5, 31.1, 28.3, 31.6, but the other samples were 35.2 to 41.8, and were imported commercial products (Armst
non-combustible foam having an excellent flame retardancy as compared with 34.5 (produced by Rong Co., Ltd.).

Therefore, under the above-mentioned compounding and processing conditions, in the compounding, the composition ratio of the resin is NBR / PVC
/ CPE = 10-50 / 30-50 / 20-40Wt
%, The composition ratio of the flame retardant is Al (OH) ₃ / magnesium silicate /, Mg (OH) ₂ / Sb ₂ O ₃ / chlorinated paraffin = 5-20 / 0-5 / 40-80 / 5-10 /
0 to 10 Wt%, the composition ratio of resin / flame retardant is 1 / 0.5
5-1 Wt%, plasticizer / blowing agent (DOP / Cellco
It was determined that the content of (m-AC system) was preferably in the range of 0 to 50/10 to 40.

Under the processing conditions, the blend is R
Performed in hemmixer (HAAKE), but without adding vulcanization and vulcanization accelerator, temperature 114-120 ° C
(With a melting point not exceeding 125 ° C.), RPM 50, time 4
After 0 minutes, vulcanization and a vulcanization accelerator are added. The temperature is 62 to 70 ° C. (the melting point does not exceed 80 ° C. in consideration of the vulcanization temperature), the RPM is 50, and the time is 10 minutes.

The extrusion was performed using a minimax molder (C
(si-183MMV) at 70-100 ℃, Rs
Vulcanization / foaming is carried out for 5 to 2 minutes, and vulcanization / foaming is performed under heating and pressure (Carver) to raise the temperature from 120 ° C. to 230 ° C. , or at 230 ° C. for 2 to 3 mi.
When carried out by the two methods with the condition of n, a foam having excellent foaming properties and flame retardancy as described above was obtained. The compositions of the components used in the above-described examples are shown in Table 2 above, and the results are shown in Table 4 and FIGS. 5, 5, 6, 7 and 8.

[0062]

As described above, the present invention blends a polyolefin resin and a rubber resin.
Using chlorinated polyethylene to provide basic flame retardancy,
By mixing inorganic and chlorine-based flame retardants, foaming agents, vulcanizing agents and other additives appropriately to produce a flame-retardant foam composition, it has excellent flame retardancy and mechanical properties, and It has environmentally friendly characteristics and has an effect that it can be usefully applied to a wide range of fields such as various building materials, automobile parts, sports goods, and various communal products by extrusion or injection molding.

[Brief description of the drawings]

FIG. 1 is an electron microscope (SEM) photograph of the foam composition (samples 1, 2, 3, and 4) produced in Example 1 of the present invention.

FIG. 2 is an electron microscope (SEM) photograph of the foam composition (samples 5, 6, and 7) manufactured in Example 2 of the present invention.

FIG. 3 is an electron microscope (SEM) photograph of the foam composition (samples 8, 9, and 10) manufactured in Example 2 of the present invention.

FIG. 4 is an electron microscope (SEM) photograph of the foam composition (samples 11, 12, and 13) manufactured in Example 2 of the present invention.

FIG. 5 is an electron microscope (SEM) photograph confirming the cell structure (A) and the degree of additive dispersion (B) in a conventional foam.

FIG. 6 shows a cell structure (A) for Sample 1 according to Example 5.
And an electron microscope (SE) confirming the additive dispersion degree (B)
M) It is a photograph.

FIG. 7 shows a cell structure (A) for Sample 4 according to Example 5.
And an electron microscope (SE) confirming the additive dispersion degree (B)
M) It is a photograph.

FIG. 8 shows a cell structure (A) for Sample 5 according to Example 5.
And an electron microscope (SE) confirming the additive dispersion degree (B)
M) It is a photograph.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/47 C08K 5/47 C08L 9/02 C08L 9/02 23/04 23/04 23/28 23 / 28 27/06 27/06 (71) Applicant 501076117 Moon Seongchul 105-414 Line Dongsan Apartment, Gwan-gu, Gwangju, Gwangju, Republic of Korea (No address) (72) Inventor Cho Byeong-Wook Japyeong-dong, Nishi-gu, Gwangju, Korea (No street address) Jin-Hang Shuanglong Apartment 209-1306 (72) Inventor Moon Seongchul 105-414 Line Dongsan Apartment, Gwan-gu, Buk-gu, Gwangju, Republic of Korea (72) Inventor Choi Jang-kun, South Korea Gwangju, Korea New Dong-A Apartment 101-1303, Longfeng-dong, North-City, Buk-gu (72) Inventor Park Dong-sang, Bukdong-ri, Damyang-eup, Damyang-gun, Korea Part 101-1106 F term (reference) 4F074 AA12 AA17 AA29 AA35 AC17 AC20 AC32 AD19 AG10 BA13 BA28 BB05 BB27 CC06Y DA02 DA35 DA36 DA37 4J002 AC071 BB031 BB241 BD031 DA048 DE076 DE126 DE146 DJ006 EE050 EH140 FD FD FD EV EV FD

Claims (6)

[Claims] 1. A flame-retardant polyolefin foam composition comprising a nitrile rubber and polyvinyl chloride as a resin component and a flame retardant, a plasticizer, a foaming agent, and a stabilizer as additives, wherein the resin component comprises: It is composed of 10 to 50% by weight of nitrile rubber, 30 to 50% by weight of polyvinyl chloride, and 20 to 40% by weight of chlorinated polyethylene or polyethylene. The flame retardant is Al (OH) ₃ 5 to 20% by weight, magnesium silicate. 0 to 5 wt%, Mg _(OH) 2 4
0-80 _{wt%, Sb} 2 O 3 5 to 10 wt%, and is composed of a chlorinated paraffin 0-10 wt%, containing at said flame retardant the resin component 1 part by weight 0.55 to 1 wt% A flame-retardant polyolefin foam composition characterized in that it contains a conventional additive. 2. The plasticizer according to claim 1, wherein said normal additive is a plasticizer.
50% by weight, 0 to 15% by weight of stabilizer, 0 to 2.
5% by weight, 0 to 1% by weight of 2-mercaptobenzothiazole (M), dibenzothiazyl disulfide (DM) and Zn-dimethyldithiocarbamate (PZ) as vulcanization accelerators; 0% to 2% by weight, foaming aid 0 to 2% by weight, heat transfer enhancer 0 to 5% by weight, external release agent 0 to 2.5% by weight, internal release agent 0 to 4% by weight, filler 0 to 10% by weight %. The flame-retardant polyolefin foam composition according to claim 1, wherein 3. The flame retardant according to claim 1, wherein the resin component comprises two or four components selected from the group consisting of nitrile rubber, polyvinyl chloride, chlorinated polyethylene and polyethylene. Polyolefin foam composition. 4. The flame-retardant polyolefin foam composition according to claim 1, wherein the nitrile rubber has an acrylonitrile content of 28 to 34%. 5. The flame-retardant polyolefin foam composition according to claim 1, wherein the chlorinated polyethylene has a chlorine content of 36 to 42%. 6. A method for producing a flame-retardant polyolefin foam composition comprising a nitrile rubber and polyvinyl chloride as resin components and a flame retardant, a plasticizer, a foaming agent and a stabilizer as additives. The component is nitrile rubber 10
50% by weight, polyvinyl chloride 30-50% by weight, and chlorinated polyethylene or polyethylene 20-40
Consists in weight%, as a flame retardant, Al _(OH) 3 5
-30% by weight, magnesium silicate 0-5% by weight,
Mg _(OH) 2 40~80 _{wt%, Sb} 2 O 3 _5~10
% Of chlorinated paraffin and 0 to 10% by weight of chlorinated paraffin.
A composition containing 1% by weight, 0 to 50% by weight of a plasticizer, 0 to 15% by weight of a stabilizer and 10 to 40% by weight of a foaming agent is mixed at 114 to 120 ° C. 0-2.5% by weight of a vulcanizing agent and 2-mercapto-benzothiazole (M), dibenzothiazyl-disulfide (DM) and Zn-dimethyl-dithiocarbamate (PZ) as vulcanization accelerators were added to the mixture. A method for producing a flame-retardant polyolefin foam composition, wherein the composition is extruded or injected after adding 0 to 1% by weight.