KR102068035B1 - Method for Manufacturing Flame Retarding Master Batch Containing Red Clay - Google Patents

Abstract

The present invention relates to a method for manufacturing a flame retardant masterbatch containing red clay, which is excellent in flame retardancy by heating a red clay powder to remove organic matter, finely grinding to make into powder, and mixing with a resin and a lubricant, followed by extruding. The flame retardant masterbatch containing red clay manufactured by the method of the present invention uses red clay as a flame retardant, thereby being harmless to humans and the environment, and is excellent in dispersibility of red clay particles even by increasing the red clay content in the masterbatch in order to improve the flame retardant performance, thereby preventing processing defects during a molding process.

Description

Method for Manufacturing Flame Retarding Master Batch Containing Red Clay}

The present invention relates to a method for producing a loess-containing flame retardant masterbatch having excellent flame retardancy by heating the ocher powder to remove organic matter, finely pulverizing and powdering, mixing with resin and lubricant, and extruding.

Synthetic resin polymers are manufactured from major materials closely related to life such as household appliances and electrical and electronic products, and end products of petrochemicals, so they are vulnerable to fire, and a series of fire accidents continue to strengthen regulations on flame retardancy.

Accordingly, synthetic resin products are required to have various grades of flame retardancy so that continuous combustion does not occur during combustion, and application and segmentation and partial reduction of application fields are in progress depending on the presence or absence of flame retardancy.

Flame retardant technology of the polymer is mainly (a) resistant to oxidation and deterioration by the modification of the polymer itself, high decomposition temperature, (b) dilution of flammable materials by addition of inorganic fillers, (c) halogen-based And a method of adding an effective flame retardant to a polymer such as phosphorus.

However, the method of (a) is very narrow and economically burdensome to select a polymer range, and the method of (b) has a significant physical property reduction resulting from high flame retardancy to the resin, which is very limited in its application. The method of said (c) is used abundantly.

As the flame retardant, generally, halogen-based flame retardants such as chlorine and bromine compounds are used alone, or in combination with non-halogen-based flame retardants of metal hydrates such as magnesium hydroxide and aluminum hydroxide, phosphorus or nitrogen compounds.

Halogen compounds exhibiting a flame retardant effect include fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) .Fluorine-containing compounds have a strong bond with carbon and iodine-containing compounds have a weak bond with carbon. It is difficult to use because it is easily decomposed at processing temperature, and chlorine and bromine are easily decomposed during combustion, HX (Br or Cl) is decomposed in a narrow area, and in the area of actual combustion, flame-retardant bromine-based compounds with high concentration The effect is the best.

These flame retardants give a flame retardant effect by reducing the concentration of the active radicals oxygen and hydroxide radicals and stopping the chain reaction.The combustion process of CX bonds is an endothermic reaction, reducing the combustible material and decomposing incombustible gases during decomposition. It also has the effect of blocking oxygen.

However, the flame-retardant halogen-based resin compounds are toxic and corrosive gases such as hydrogen halides due to combustion, and thus the scope of application is gradually reduced due to high human hazards and low flame retardancy. The dioxin and furan substances are strictly regulated worldwide.

In addition, the base resin containing a halogen has a disadvantage that it is difficult to obtain a flame retardant material having a halogen content of 0.5% or less and a toxicity index of 1.5 or less, and poor thermal characteristics at high temperature.

Therefore, in view of human harmfulness, the method of using an inorganic flame retardant which is a method of excluding the halogen-based flame retardant (b) has been actively studied. Among the inorganic flame retardants, aluminum hydroxide, antimony oxide, magnesium hydroxide, boron-containing compounds, etc. are most frequently used. It is used.

 Unlike organic flame retardants, inorganic flame retardants do not volatilize by heat and release gas such as water, carbon dioxide, sulfur dioxide, and hydrochloric acid. Most of them are endothermic, dilute flammable gas in the gas phase, and apply synthetic resin surface to prevent oxygen access. At the same time, there is an effect of reducing the generation of cooling and pyrolysis products of the synthetic resin through the endothermic reaction on the surface of the solid phase.

However, when the inorganic flame retardant is included in the synthetic resin, there is a disadvantage in that the physical properties are reduced. To compensate for this, an inorganic flame retardant, in particular, a coated metal hydroxide having improved dispersibility by modifying the surface of the metal hydroxide with a silane group is used. Metal hydroxides are very expensive, and when they are replaced with inexpensive non-coated metal hydroxides, physical properties such as dispersibility, tensile strength, and load during operation of the flame retardant containing inorganic flame retardant are greatly reduced.

Therefore, in the flame-retardant synthetic resin composition, it is urgently required to develop a low cost uncoated inorganic flame retardant to replace the expensive silane-coated metal hydroxide without reducing such physical properties.

In this way, Korean Patent Publication No. 0578598 discloses a content related to ocher-containing flame retardant compositions, masterbatches and foams.

The invention is a flame retardant composition consisting of 30 to 50% by weight of aluminum hydroxide, 30 to 45% by weight of magnesium hydroxide and 5 to 40% by weight of ocher having a particle size of 100 to 1000 nm; A flame retardant masterbatch kneaded with the polyolefin resin and melt-extruded at a temperature of 100 to 235 ° C. to prepare a resin mixture and then cooled in a cooling bath at room temperature; The flame retardant masterbatch is mixed with a crosslinking masterbatch (containing polyethylene resin and dicumyl peroxide) and a foaming masterbatch (polyethylene and azodicarbonamide powder) to form a crosslinking step of 150 to 170 ° C. and a foaming step of 180 to 210 ° C. It provides a flame-retardant polyolefin foam prepared through, and can exclude the halogen-containing compound to provide an environmentally friendly effect by containing ocher.

In order to impart flame retardancy to the olefin resin, a flame retardant of a predetermined amount or more must be included. Therefore, the flame retardant masterbatch is mixed with 100 to 350 parts by weight of the flame retardant composition with respect to 100 parts by weight of polyolefin resin and foamed together with the crosslinking and foaming masterbatch to be flame retardant. However, if a large amount of the flame retardant composition is contained as described above, processing defects such as yellowing, bromination, property deterioration, poor fusion, etc. occur, and if the olefin resin content is increased to prevent this problem, the flame retardancy decreases by that amount. There is.

Accordingly, Korean Patent Publication No. 0586361 discloses a flame retardant masterbatch composition for highly concentrated olefin resins which minimizes the use of olefinic resins, increases the amount of flame retardant, maximizes the mechanical properties, and minimizes molding defects when processing olefinic resins. And its products.

The flame retardant masterbatch composition is composed of 2 to 20 weight ratio of olefin resin, 2 to 20 weight ratio of lubricant and dispersant, 60 to 96 weight ratio of total amount of flame retardant and flame retardant, the flame retardant is pyrolysis temperature is 350 ~ 1300 ℃ and flame retardant and flame retardant And a weight ratio of one flame retardant aid to one to six flame retardants in the total amount of the adjuvant.

The present invention maximizes the intrinsic properties and properties of the olefinic resin by constituting the flame retardant adjuvant as antimony trioxide, antimony pentoxide or a mixture thereof to maximize the intrinsic properties and properties of the olefin resin, but the heavy metal component antimony is similar to arsenic in the human body. Because it is a metabolic toxic substance, it may expose human health to fatal dangers.

Therefore, there is still a need to develop a flame retardant masterbatch that is harmless to the human body while maximizing the flame retardant effect without degrading the properties of the base base resin.

The present invention is to solve the above problems, to provide a manufacturing method of the ocher-containing flame retardant masterbatch which is excellent in flame retardancy and prevent processing defects during molding process while using ocher harmless to human body and environment as a flame retardant. .

In order to solve the above problems, the present invention is to remove the organic material by heating the loess at 180 ~ 220 ℃; Pulverizing the organic soil from which the ocher is removed by pulverizing to an average particle size of 220 ~ 260 nm; 20 to 30% by weight of the yellow clay powder 20-30% by weight of sodium hyposulfite and 45-55% by weight of sodium citrate are mixed with water, followed by filtration to remove water crystalline iron oxide; Amorphous iron oxide removal step of removing water by adjusting the pH to 5 ~ 6 after mixing 80 ~ 90% by weight of ammonium acetate with 10 to 20% by weight of the crystalline iron oxide removed ocher; Mixing 15 to 85% by weight of the resin and 0.5 to 5.0% by weight of the lubricant to 10 to 80% by weight of the ocher powder from which the amorphous iron oxide is removed; And a step of extruding the mixture. It provides a method for producing a flame retardant masterbatch containing ocher.

At this time, it is preferable that the process of removing the distilled water by washing the crystalline iron oxide or the amorphous ocher powder removed with distilled water and then filtered.

In addition, the extrusion process is preferably made of a process in which the resin is added to the extruder having a mesh of 150 ~ 170 mesh is installed in the die and melted, and then the ocher powder and lubricant are added to mix with the molten resin and extrude, The molten extrudate extruded from the water is preferably made by cutting in water at 85 to 95 ° C., gradually cooling the water while transferring it through a pipe with water, drying in a dehydrator, and removing defective products from the vibrator.

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The ocher-containing flame retardant masterbatch produced by the method of the present invention uses ocher as a flame retardant, so it is harmless to humans and the environment and increases the ocher content in the masterbatch to improve the flame retardant performance. Machining defects can be prevented.

1 is a photograph comparing the surface state after preparing the specimen using the flame retardant masterbatch by varying the loess crushing and loess content.

The present invention is to heat the ocher at 180 ~ 220 ℃ to carbonize and remove the organic matter, pulverized to an average particle size of 220 ~ 260 ㎚ to powder, and then mixed with the ocher powder and lubricant, and the extrusion process containing the ocher Prepared flame retardant masterbatches.

Ocher is an amorphous aluminum silicate chemically containing iron oxide hydrate, mainly composed of silica (SiO ₂ ), alumina (Al ₂ O ₃ ), and other iron (Fe), magnesium (Mg), manganese (Mn), sodium (Na). ), Potassium (K), titanium (Ti) compounds, etc., and the size of general ocher particles is about 10 ~ 60 ㎛ and has a viscosity that is not easily broken by calcium carbonate and changes to clay when water is added There is this.

Loess is a honeycomb-shaped multilayer structure of silicon clay minerals such as iron oxide, quartz and feldspar, and loess without molecular ring is heat-transfer evenly to resin when forming at high temperature and high pressure together with resin with molecular ring. It improves the adhesion between the components, does not burn or transfer heat even if it receives heat due to fire, and the crystal water contained in the ocher absorbs heat to exhibit a flame retardant effect.

In addition, loess has beneficial properties to the human body due to its inherent characteristics such as antibacterial effect, dehumidification and deodorization effect, far infrared radiation ability, purifies environmental pollutants, and does not cause environmental pollution at disposal. It can be widely used for

In the present invention, such ocher is used as a flame retardant. First, the ocher is heated to a temperature of 180 to 220 ° C. to carbonize and remove organic substances contained in the ocher, and fine pores and crystal water contained irregularly in the ocher. This organic matter removal loess can be blended more with the resin by reducing the oil absorption when blended with the resin, thereby increasing the flame retardancy of the masterbatch.

In addition, it is preferable to minimize the average particle size of ocher, and more preferably 220 to 260 nm, and the finer the size of the ocher particles, the more the surface area per unit volume increases, so that dispersibility, plasticity, adsorption, absorption and dehydration, suspension, and ion The properties such as exchangeability can be maximized, but if the average particle size is less than 220 nm, the oil absorption with the resin is strong and the viscosity increases, so that the moldability is lowered, and when it exceeds 260 nm, the dispersibility is lowered when mixing with the resin. The large particle size during the molding operation lowers the surface smoothness.

However, ocher has a tendency to agglomerate in the resin, and if it is contained in a certain content or more in the resin, the distribution of the ocher particles becomes uneven, so that the physical properties of the product produced by the masterbatch are lowered. Degrades.

Therefore, there is a need for a method of increasing dispersibility while increasing the content of ocher in the resin, and for this purpose, the present invention removes the iron component from the elements contained in the ocher to increase the dispersibility by inhibiting the aggregation of the ocher particles.

Dispersion and agglomeration of ocher particles depend on the surface charge of the particles, the concentration of the ocher particles, and the type of cations.The surface charges of the ocher particles adsorb the cations and anions or cause exchange reactions. In the present invention, the coagulation of the ocher particles is suppressed by removing the iron component having a great influence on the surface charge of the ocher particles and inhibiting the adsorption or exchange reaction.

The iron component contained in ocher is mainly in the form of iron oxide, and iron oxide can be classified into crystalline iron oxide and amorphous iron oxide. Iron oxide in ocher is mainly composed of crystalline iron component and crystalline iron component is distributed on the surface of ocher particles. Since it affects the surface charge to agglomerate the ocher particles, it is more effective to remove the crystalline iron oxide in the ocher component to improve the dispersibility of the ocher particles.

To remove crystalline iron oxide, 20-30 wt% of ocher powder, 20-30 wt% of sodium hydrosulfite and 45-55 wt% of sodium citrate are mixed with water, sufficiently stirred, and filtered It is possible to remove crystalline iron oxide of ocher by removing.

The ocher from which the crystalline iron oxide is removed exhibits a characteristic of permanent charge in which negative charge is strongly expressed by ion substitution in the crystal structure. As a result, the cohesion phenomenon of the ocher particles is reduced by the ion exchange, thereby reducing the ocher particles. The effect of improving acidity can be obtained.

In order to further improve the dispersibility of the ocher particles, it is preferable to remove not only the crystalline iron oxide but also the amorphous iron oxide in the ocher particles. For this purpose, 80 to 90 wt% of ammonium acetate is added to 10 to 20 wt% of the ocher powder. After mixing with enough stirring to adjust the pH to 5-6 with acetic acid (acetic acid) and filtered to remove the water can remove the amorphous iron oxide of ocher.

The ocher powder from which the crystalline iron oxide or amorphous iron oxide is removed may be washed with distilled water and then filtered to remove distilled water, thereby further increasing the removal rate of the iron oxide to further improve the dispersibility of the ocher particles.

The ocher from which the iron oxide is removed is uniformly dispersed without agglomeration in the resin, so that the ocher content in the masterbatch can be increased, and the flame retardancy can be increased as the ocher content of the masterbatch increases.

The resin may be selected from polyolefin resin, polystyrene (PS) (HIPS, GPPS), acrylonitrile-butadien-styrene resin (ABS), polyethylene terephthalate (PET) or starch resin. The species may be used alone or two or more kinds thereof may be used, and as the polyolefin resin, polyethylene (PE, PE) (LDPE, HDPE), polypropylene (PP), polymethyl (meth) acrylate (polymethyl (meth) acrylate), polyvinyl acetal, polyvinyl chloride, and the like are preferred, but the type is not particularly limited.

The lubricant is added to increase the workability by improving the fluidity during the molding process using a masterbatch, zinc stearate (Zn-St), magnesium stearate (Mg-St) or low molecular wax (LP wax) It is possible to select a lubricant according to the type of resin that can be used. For example, it is preferable to add zinc stearate when mixing ocher with a polyolefin resin, and to add magnesium stearate when mixing with PS, ABS or PET resin. .

Flame retardant masterbatch of the present invention may be composed of 10 to 80% by weight of ocher powder, 15 to 85% by weight of resin and 0.5 to 5.0% by weight of lubricant, and the temperature of the extruder feeder during the extrusion process PET 140 ~ 150 ℃, PET The remaining resin is set to 50 ~ 60 ℃, extrusion temperature is preferably set to LDPE 140 ~ 150 ℃, HDPE 170 ~ 180 ℃, PP 180 ~ 200 ℃, PS and ABS 200 ~ 210 ℃, PET 200 ~ 240 ℃ Do.

During the extrusion process, ocher powder, resin, and lubricant may be added to the extruder, but the resin is first introduced into the extruder (feeder) to melt the resin inside the extruder body, and then the ocher powder and lubricant are added to the molten resin and Mixing process of ocher powder, resin, and lubricant may be omitted by compounding and extruding them through screws and dies. In this case, it is preferable to install 150 to 170 mesh nets on the die to increase the dispersion of the extrudate. Do.

Pellet granulation methods include an underwater cutting system and a strand cutting system, and the underwater cutting system uses a molten extrudate extruded from an extruder to remove water. The present invention is a method of cutting and pelletizing in the presence, and the strand cutting method is a method of pelletizing by cutting into a pelletizer after cooling the extruded molten extrudates in a water bath.

As the strand cutting method is not good in dispersing power, it is necessary to repeat the extrusion process two or three times, which increases manufacturing cost and working time, decreases physical properties due to the resin properties, and ensures that water is not removed. There is a need for a secondary drying operation to remove moisture, but the underwater cutting method is more preferable because the water drying proceeds smoothly and excellent dispersibility compared to the strand method.

When the extruded molten extrudate is cooled with cold cold water during underwater cutting, it is preferable to adjust the temperature of the water to cool the extrudate to 85 ~ 95 ℃ because it has an adverse effect on the quality of the master batch due to the rapid temperature change. It is more preferable that the underwater cut pellets are gradually cooled while transferring the water together with water through a pipe, and then dried in a dehydrator. The dried pellets are introduced into a vibrator to remove defective pellets that are not properly cut. Most preferably removed.

In addition, it is also possible to control the physical properties of the masterbatch by appropriately adjusting the pellet residence time through the flow control valve during pipe transfer.

The ocher-containing flame retardant masterbatch prepared as described above may be injected or extruded alone, or may be injected or extruded by blending with various resins to produce a molded article, and when used alone, manufacturing cost is reduced as compared with other resins. In addition to flame retardancy, antibacterial and deodorizing properties are further improved.

Conventional halogen-based flame retardant has a harmful effect on the human body and the environment due to its own toxicity and inorganic flame retardant has the problem of causing environmental pollution by the addition of antioxidants, but yellow soil is non-toxic and non-flammable and antistatic flame retardant Or it does not need to add auxiliaries such as dispersants, plasticizers, crosslinking aids, antistatic agents, antioxidants, etc., so that secondary environmental pollution can be prevented. The use of ocher-containing flame retardant masterbatches can eliminate the hazards associated with conventional flame retardants.

Therefore, the ocher-containing flame retardant masterbatch of the present invention can be widely used in industrial products such as household goods, agricultural / industrial plastics, automobile interiors, floor plates, medical devices, building materials, food containers, and the like.

Hereinafter, the present invention will be described in more detail based on the following Examples, Comparative Examples and Test Examples.

However, the following examples are only for illustrating the present invention, and the present invention is not limited to the following examples, and may be changed to other embodiments equivalent to substitutions and equivalents without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art to which the present invention pertains.

<Example 1>

The loess was heated at 200 ° C. to carbonize organic matter and impurities, and then ground to powder with an average particle size of 240 nm.

1 kg of the ocher powder, 1 kg of sodium hyposulfite and 2 kg of sodium citrate were added to 10 kg of distilled water, followed by mixing for 20 hours, followed by filtration to remove distilled water. The distilled water was mixed again with distilled water, stirred and filtered. The ocher processed powder from which distilled water was removed was obtained.

After heating the feeder temperature of the twin screw extruder to 55 ° C. and raising the internal temperature of the screw mounted body to 145 ° C., the low density polyethylene resin was first melted into the feeder to melt the low density polyethylene, and then the brown clay processing powder 450 g 10 g of zinc stearate was added thereto, and the low-density polyethylene resin, the ocher processed powder, and zinc stearate were sufficiently kneaded and extruded.

The die of the extruder is provided with a mesh of 160 mesh, and the die discharge port is connected with a water tank equipped with a cutting machine of 90 ° C., and the resin, ocher processed powder and zinc stearate melt are passed through the mesh network. After being extruded, it is cut in water at 90 DEG C and made into pellets.

The pellet was transferred to the dehydrator through the pipe along with the water in the tank, and a flow rate control valve was installed in the pipe to adjust the flow rate so that the temperature of the pellet arrived at the dehydrator was 40 ° C. After drying in the dehydrator, water was removed to be transferred to the vibrator. By removing the pellets in poor cutting state to prepare a flame-retardant masterbatch.

<Example 2>

In Example 1, 6 kg of 1 M ammonium acetate solution was mixed with 1 kg of the ocher processed powder from which the distilled water was removed, and the mixture was sufficiently stirred. Then, the pH was adjusted to 5.5 with acetic acid and filtered to remove distilled water. After mixing, stirring, and filtration to remove distilled water to obtain a secondary ocher processed powder.

A flame retardant masterbatch was prepared in the same manner as in Example 1, except that the secondary loess processed powder was added to a twin screw extruder together with low density polyethylene and zinc stearate.

Comparative Example 1

In Example 1, the flame retardant masterbatch was applied in the same manner as in Example 1, except that the ocher powder obtained by heating and pulverizing the loess was added to the feeder of the twin screw extruder without being treated with distilled water, sodium hyposulfite and sodium citrate. Was prepared.

Comparative Example 2

In Example 1, a flame retardant masterbatch was prepared in the same manner as in Example 1, except that 360 g of bromine flame retardant and 90 g of antimony trioxide were added to the feeder of the twin screw extruder instead of the ocher processed powder.

<Test Example 1> Flame retardancy measurement

The flame-retardant masterbatch prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were mixed with a low density polyethylene in a 1: 9 weight ratio and introduced into an injection molding machine, and the plate had a width × length × thickness = 150 × 150 × 1 mm. ) 12 specimens (for 5VA) and 20 bar specimens (for 5VB) of 125 × 13 × 3 mm were injection molded and then left to stand at room temperature for 24 hours to prepare the specimens. Laboratories Standard) A vertical combustion test for 5V grades under Subject 94 (Heat resistance test of plastic materials) was conducted.

After 125 mm of flame was applied to the specimen for 5 seconds, the flame was removed for 5 seconds, and repeated 5 times. Then, the average afterflaming time, the ignition, and the presence of 3 mm or more holes after 30 seconds were confirmed. Table 1 shows.

Flame retardant measurement results Example 1 Example 2 Comparative Example 1 Comparative Example 2 Test 1 (seconds) 36.1 / 33.6 ^{Note 1)} 35.4 / 30.7 52.3 / 50.4 33.5 / 31.2 Test 2 No / No No / No No / No No / No Test 3 No / No No / No Yes / Yes No / No Note 1) 5VA / 5VB
(Test 1) Burning and sparking time after applying five flames
(Test 2) Ignition of cotton wool by dripping
(Test 3) Generation of holes in the specimen due to flame and combustion

As shown in Table 1, the combustion time of the bar specimen for 5VB was slightly longer than the plate specimen for 5VA, but both Examples and Comparative Examples were measured to be 60 seconds or less, based on 5VA and 5VB grades, and ignition occurred in all specimens. However, holes were generated in Comparative Example 1.

In Comparative Example 1, the ocher powder content in the master batch is contained in a high proportion of 45% by weight, and unlike the example, the ocher powder is not uniformly dispersed in the specimen because the iron oxide component of the ocher powder is not removed. Due to insufficient flame retardancy, it is considered that a hole has occurred in the specimen.

The flame retardant performance of Comparative Example 2 using bromine-based flame retardant was the best measured, but the flame retardant performance of the example using ocher as flame retardant showed no significant difference compared to Comparative Example 2 and also satisfied the 5VA grade standard. It was confirmed that the ocher-containing flame retardant masterbatch of the embodiment according to the present invention can exert sufficient flame retardant effect.

Test Example 2 Surface State of Molded Product

In Example 1, the ocher processed powder content was mixed at 300/500/700 g, respectively, where low-density polyethylene content 690/490/290 g and zinc stearate 10 g were mixed to prepare a flame-retardant masterbatch and injection molding alone. In order to prepare the specimen (A), and also after the carbonization of ocher in the process of manufacturing a flame-retardant masterbatch, the ocher particles were screened with an average particle size of about 60 μm without pulverization. Mixing to prepare a flame retardant masterbatch and specimen (B).

The specimens A and B are shown in Figure 1, the surface state of the specimen A is smooth, but the surface of the specimen B is rough, as in the specimen A used to prepare the flame retardant masterbatch by finely crushing the yellow soil, such as formability and surface smoothness It can be seen that it can be improved.

A: Specimens used for flame retardant masterbatch by finely crushing ocher, B: Specimens used for flame retardant masterbatch without crushing ocher

Claims (7)

Heating the loess at 180-220 ° C. to remove organics;
Pulverizing the organic soil from which ocher is removed by pulverizing to an average particle size of 220 ~ 260 nm;
20 to 30% by weight of the yellow clay powder 20-30% by weight of sodium hyposulfite and 45-55% by weight of sodium citrate are mixed with water, followed by filtration to remove water crystalline iron oxide;
Amorphous iron oxide removal step of removing water by adjusting the pH to 5 ~ 6 after mixing 80 ~ 90% by weight of ammonium acetate with 10 to 20% by weight of the crystalline iron oxide removed ocher;
Mixing 15 to 85% by weight of the resin and 0.5 to 5.0% by weight of the lubricant to 10 to 80% by weight of the ocher powder from which the amorphous iron oxide is removed; And
A process for producing a flame retardant masterbatch containing ocher, comprising: extruding the mixture. delete delete The method according to claim 1,
The process for producing a fire retardant masterbatch containing ocher, characterized in that the process of removing the distilled water by washing the ocher powder from which the crystalline iron oxide or amorphous iron oxide has been removed with distilled water and then filtering. The method according to claim 1,
The extrusion process is characterized in that the loess is characterized in that the resin is put into the extruder is installed 150 ~ 170 mesh net in the die and then the ocher powder and the lubricant is added and blended with the molten resin and extruded, Method for preparing a flame retardant masterbatch contained. The method according to claim 1,
The extrusion processing is a process of cutting the molten extrudate extruded from the extruder in water of 85 ~ 95 ℃ and gradually cooled while transferring through the pipe with water, dried in a dehydrator and removing the defective products in the vibrator Characterized in that, the manufacturing method of the ocher-containing flame retardant masterbatch. delete

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