KR20160054966A - Polyketone microwave component - Google Patents

Abstract

The present invention relates to a polyketone microwave component, and more particularly, to a polyketone microwave component applicable to a turn table roller or a turn table bracket, having good impact resistance, humidity resistance, abrasion resistance and extrusion moldability by using a linear alternating polyketone terpolymer. A polyketone microwave component manufactured by extrusion molding a polyketone copolymer comprising repeating units represented by chemical formula (1), -CH2CH2-CO_x-, and chemical formula (2), -CH2-CH(CH3)-CO_y-, wherein x and y represent the mole% of chemical formulae (1) and (2) in a polymer, respectively. The polyketone copolymer is prepared by extrusion molding a linear alternating polyketone of which y / x is 0.03-0.3, the inherent viscosity of the polyketone is 1.0 to 2.0 dl/g, the abrasion resistance amount of the microwave component manufactured by the extrusion molding is 1.0 mm3/kg/km or less.

Description

[0001] Polyketone microwave component [0002]

The present invention relates to a polyketone microwave component, and more particularly, to a polyketone microwave component having excellent heat resistance and wear resistance by applying a polyketone, which is an engineering plastic, to a microwave oven turntable roller or a turntable bracket.

A microwave oven is a cooking appliance that uses a microwave and / or a heater to heat a food. Such a microwave oven is provided with various components including a heating source such as a magnetron for microwave oscillation and a heater for generating heater heat.

Further, the microwave oven is provided with a component having a relatively high heating value, for example, a heater, and a component having a relatively low heating value, such as a magnetron.

Therefore, the PTFE is used as the microwave part, and the PTFE is made of the heat-resistant material. In particular, the microwave oven turntable roller and the bracket are easily worn. In addition, PTFE has good chemical resistance but has a weak point in the processing process. Unlike other commercial plastics, PTFE is molded into the desired form of PTFE suspension powder dispersed in a diluent to make the molding, the diluent is removed by evaporation and the molded article is consolidated by sintering without melting . In other words. PTFE did not melt and was difficult to produce by injection molding.

On the other hand, Polyketone (PK) is an inexpensive material of raw material and polymerization process ratio compared with general engineering plastic materials such as polyamide, polyester and polycarbonate. It has excellent properties such as heat resistance, chemical resistance, fuel permeability and abrasion resistance It is widely applied to various industries.

For this reason, there is a growing interest in a family of linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon, known as polyketones or polyketone polymers. U.S. Patent No. 4,880,903 discloses a linear alternating polyketone terpolymer consisting of carbon monoxide, ethylene and terephthalic unsaturated hydrocarbons such as propylene. The process for preparing the polyketone polymer is generally carried out by reacting a compound of a Group VIII metal selected from among palladium, cobalt or nickel with an anion of a strong halogen-hydrohalogentic acid, , Phosphorus, arsenic, or antimony (Antimon). U.S. Patent No. 4,843,144 discloses a method for producing a polymer of carbon monoxide and at least one ethylenically unsaturated hydrocarbon using a palladium compound, an anion of a nonhydrohalogenic acid having a pKa of less than 6, and a catalyst that is a bidentate ligand Lt; / RTI >

Korean Patent No. 1006685720000 Korean Patent No. 1004453540000 Korean Patent No. 1008108650000

It is an object of the present invention to provide a polyketone microwave component having excellent abrasion resistance, heat resistance and injection moldability.

In order to achieve the above object, according to a preferred embodiment of the present invention, there is provided a polyketone copolymer comprising repeating units represented by the following general formulas (1) and (2) Ketone is molded by injection molding, wherein the wear resistance is 1.0 mm < 3 > / kg / km or less.

- [- CH2CH2-CO] x- (1)

- [- CH2 --CH (CH3) - CO] y - (2)

(x and y represent mol% of each of the general formulas (1) and (2) in the polymer).

According to another preferred embodiment of the present invention, the microwave part is a turntable roller or a turntable bracket.

According to still another preferred embodiment of the present invention, the microwave oven component has a heat distortion temperature of 130 ° C or higher.

According to another preferred embodiment of the present invention, the microwave part is characterized in that the injection cycle is less than 20 sec.

The polyketone microwave component of the present invention can produce a polyketone microwave component that is superior in abrasion resistance and injection moldability to PTFE materials that have been used in the past.

Hereinafter, the present invention will be described in detail.

The polyketone microwave part of the present invention is made of polyketone.

1. Polymerization of polyketones

The polymerization of the polyketone is carried out in the presence of an organometallic complex catalyst consisting of (a) a Group 9, Group 10 or Group 11 transition metal compound, and (b) a ligand having an element of Group 15 elements, Wherein the carbon monoxide, ethylene and propylene are subjected to liquid phase polymerization in a mixed solvent of an alcohol (for example, methanol) and water to produce a linear terpolymer, wherein the mixed solvent A mixture of 100 parts by weight of methanol and 2 to 10 parts by weight of water may be used. If the content of water in the mixed solvent is less than 2 parts by weight, a ketal may be formed to lower the heat stability in the process. If the amount is more than 10 parts by weight, the mechanical properties of the product may be deteriorated.

Wherein the catalyst comprises (a) a Group 9, 10 or 11 transition metal compound of the Periodic Table of the Elements (IUPAC Inorganic Chemical Nomenclature, 1989) and (b) a ligand having an element of Group 15 elements.

Examples of the Group 9 transition metal compound in the ninth, tenth, or eleventh group transition metal compound (a) include complexes of cobalt or ruthenium, carbonates, phosphates, carbamates, and sulfonates, Specific examples thereof include cobalt acetate, cobalt acetylacetate, ruthenium acetate, ruthenium trifluoroacetate, ruthenium acetylacetate, and ruthenium trifluoromethanesulfonate.

Examples of the Group 10 transition metal compounds include complexes of nickel or palladium, carbonates, phosphates, carbamates, sulfonates and the like. Specific examples thereof include nickel acetate, nickel acetylacetate, palladium acetate, palladium trifluoroacetate , Palladium acetylacetate, palladium chloride, bis (N, N-diethylcarbamate) bis (diethylamine) palladium and palladium sulfate.

Examples of the Group 11 transition metal compound include copper or silver complexes, carbonates, phosphates, carbamates, and sulfonates, and specific examples thereof include copper acetate, copper trifluoroacetate, copper acetylacetate, Examples of the fluoroacetic acid include silver acetyl acetate, trifluoromethanesulfonic acid and the like.

Of these, the transition metal compound (a), which is preferable inexpensively and economically, is nickel and copper compounds, and the preferable transition metal compound (a) in terms of the yield of the polyketone and the molecular weight is the palladium compound, It is most preferable to use palladium acetate.

Examples of the ligands (b) having an atom of Group XIII include 2,2'-bipyridyl, 4,4'-dimethyl-2,2'-bipyridyl, 2,2'- Bis (diphenylphosphino) ethane, 1,3-bis (diphenylphosphino) propane, 1,4-bis (diphenylphosphino) (2-methoxyphenyl) propane, 1,3-bis [di (2-isopropyl) Bis (diphenylphosphino) cyclohexane, 1,2-bis (diphenylphosphino) phosphine] propane, (Diphenylphosphino) methyl] benzene, 1,2-bis [[di (2-methoxyphenyl) (Diphenylphosphino) ferrocene, 2-hydroxy-1,3-bis [di (2-methoxy- (2-methoxyphenyl) phosphino] propane, 2,2-dimethyl-1,3-bis [di (2- Spinosyns; there may be mentioned a ligand, such as propane.

Among these ligands, preferred ligands (b) having a Group 15 element are phosphorus ligands having an atom of Group 15, and particularly preferred ligands in terms of yield of polyketone are 1,3-bis [di (2- Methoxyphenyl) phosphino] propane and 1,2-bis [[di (2-methoxyphenyl) phosphino] methyl] benzene, Di (2-methoxyphenyl) phosphino] propane, and it is safe in that it does not require an organic solvent. Soluble sodium salts such as 1,3-bis [di (2-methoxy-4-sulfonic acid sodium-phenyl) phosphino] propane, 1,2- ] Methyl] benzene, and 1,3-bis (diphenylphosphino) propane and 1,4-bis (diphenylphosphino) butane are preferred for ease of synthesis and availability in large quantities and economically. The preferred ligand (b) having a Group 15 atom is 1,3-bis [di (2-methoxyphenyl) phosphino] propane or 1,3-bis (diphenylphosphino) Bis (di (2-methoxyphenyl) phosphino] propane or ((2,2-dimethyl-1,3-dioxane-5,5- -Methoxyphenyl) phosphine).

The amount of the Group 9, Group 10 or Group 11 transition metal compound (a) to be used varies depending on the kinds of the ethylenic and propylenically unsaturated compounds to be selected and other polymerization conditions. Therefore, But it is usually from 0.01 to 100 mmol, preferably from 0.01 to 10 mmol, per 1 liter of the reaction zone. The capacity of the reaction zone means the liquid phase capacity of the reactor. The amount of the ligand (b) to be used is not particularly limited, but is usually 0.1 to 3 mol, preferably 1 to 3 mol, per 1 mol of the transition metal compound (a).

Further, the addition of benzophenone in the polymerization of the polyketone is another characteristic. In the present invention, an effect of improving the intrinsic viscosity of the polyketone can be achieved by adding benzophenone in the polymerization of the polyketone. The molar ratio of (a) the ninth, tenth or eleventh transition metal compound to benzophenone is 1: 5-100, preferably 1:40-60. If the molar ratio of the transition metal to the benzophenone is less than 1: 5, the effect of improving the intrinsic viscosity of the produced polyketone is unsatisfactory. If the molar ratio of the transition metal to the benzophenone exceeds 1: 100, It is not preferable because it tends to decrease

Examples of the ethylenically unsaturated compound copolymerized with carbon monoxide include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, -Olefins such as hexadecene and vinylcyclohexane; Alkenyl aromatic compounds such as styrene and? -Methylstyrene; But are not limited to, cyclopentene, norbornene, 5-methylnorbornene, 5-phenylnorbornene, tetracyclododecene, tricyclododecene, tricyclodecene, pentacyclopentadecene, pentacyclohexadecene, Cyclic olefins such as cyclododecene; Vinyl halides such as vinyl chloride; Ethyl acrylate, and acrylates such as methyl acrylate. Of these, preferred ethylenically unsaturated compounds are? -Olefins, more preferably? -Olefins having 2 to 4 carbon atoms, and most preferably ethylene.

Wherein the carbon monoxide and the ethylenically unsaturated compound and the propylenically unsaturated compound are copolymerized with an organometallic complex comprising a ligand (b) having an element of group 9, group 10 or group 11 transition metal compound (a) or group 15 Catalyzed, the catalyst is produced by contacting the two components. Any method may be employed as the method of contacting. That is, the solution may be prepared as a solution in which two components are premixed in a suitable solvent, or the two components may be supplied separately to the polymerization system and contacted in the polymerization system.

 As the polymerization method, a solution polymerization method using a liquid medium, a suspension polymerization method, a vapor phase polymerization method in which a small amount of a polymer is impregnated with a high concentration catalyst solution, and the like are used. The polymerization may be either batchwise or continuous. The reactor used in the polymerization can be used as it is or in a known manner. The polymerization temperature is not particularly limited, and is generally 40 to 180 占 폚, preferably 50 to 120 占 폚. The pressure at the time of polymerization is not particularly limited, but is generally from normal pressure to 20 MPa, preferably from 4 to 15 MPa.

A linear alternating polyketone is prepared by the polymerization method as described above.

2. Polyketone resin

The polyketone of the present invention is a new resin developed in recent years and is excellent in mechanical properties such as impact strength and molding characteristics and is a thermoplastic synthetic resin which is usefully applied to various molded articles and parts. The mechanical properties of the polyketone resin belong to the category of high performance plastics, and they are attracting much attention as eco-friendly materials because they are polymeric materials synthesized from carbon monoxide as a raw material.

The polyketone resin is less hygroscopic than nylon, and it is possible to design various products with less changes in dimensions and physical properties due to moisture absorption. Especially, polyketone resin is more suitable for weight reduction because it has lower density than aluminum material.

On the other hand, the polyketone polymer of the present invention is a line-by-line alternating structure and substantially contains carbon monoxide per one molecule of unsaturated hydrocarbon. Ethylenically unsaturated hydrocarbons suitable for use as precursors of polyketone polymers have up to 20 carbon atoms, preferably up to 10 carbon atoms. Ethylenically unsaturated hydrocarbons can also be selected from the group consisting of ethene and alpha-olefins such as propene, 1-butene, iso-butene, 1- hexene, 1- octene, , Or an aryl aliphatic group containing an aryl substituent on another aliphatic molecule, particularly containing an aryl substituent on an ethylenically unsaturated carbon atom. Examples of aryl aliphatic hydrocarbons in ethylenically unsaturated hydrocarbons include styrene, p-methyl styrene, p-ethyl styrene and m-isopropyl styrene. The polyketone polymer preferably used in the present invention is a copolymer of carbon monoxide and ethene or a second ethylenically unsaturated hydrocarbon having carbon monoxide, ethene and at least three carbon atoms, in particular alpha-olefins such as propene Is a terpolymer.

When the polyketone terpolymer is used as the main polymer component of the blend of the present invention, there are at least two units containing an ethylene moiety in each unit containing the second hydrocarbon moiety in the terpolymer. It is preferable that the number of units containing the second hydrocarbon moiety is from 10 to 100.

Preferred polymeric rings of the polyketone polymers in the present invention can be represented by the following formula (1).

[Chemical Formula 1]

- [CO- (-CH2-CH2-)] x- [CO- (G)] y-

In the above formula (1), G is an ethylenically unsaturated hydrocarbon, particularly an ethylenically unsaturated hydrocarbon having at least three carbon atoms, and x: y is preferably at least 1: 0.01.

In another embodiment, the polyketone polymer is a copolymer comprising repeating units represented by the general formulas (1) and (2), and y / x is preferably 0.03 to 0.3. When the value of the y / x value is less than 0.03, there is a limit in that the meltability and processability are inferior. When the value of y / x is more than 0.3, the mechanical properties are poor. Further, y / x is more preferably 0.03 to 0.1.

- [- CH2CH2-CO] x- (1)

- [- CH2 --CH (CH3) - CO] y - (2)

In addition, the melting point of the polymer can be controlled by controlling the ratio of ethylene to propylene in the polyketone polymer. For example, when the molar ratio of ethylene: propylene: carbon monoxide is adjusted to 46: 4: 50, the melting point is about 220 ° C, while the melting point is adjusted to 235 ° C when the molar ratio is adjusted to 47.3: 2.7: 50.

Particularly preferred are polyketone polymers having a number average molecular weight of from 100 to 200,000, especially from 20,000 to 90,000, as measured by gel permeation chromatography. The physical properties of the polymer are determined according to the molecular weight, depending on whether the polymer is a copolymer or a terpolymer and, in the case of a terpolymer, the properties of the second hydrocarbon part. The melting point of the total of the polymers used in the present invention is 175 ° C to 300 ° C, and generally 210 ° C to 270 ° C. The intrinsic viscosity (LVN) of the polymer measured by HFIP (hexafluoroisopropyl alcohol) at 60 DEG C using a standard tubular viscosity measuring apparatus is 0.5 dl / g to 10 dl / g, preferably 0.8 dl / g to 4 dl / g, And more preferably 1.0 dl / g to 2.0 dl / g. If the intrinsic viscosity is less than 0.5 dl / g, the mechanical properties are deteriorated. If the intrinsic viscosity exceeds 10 dl / g, the workability is deteriorated.

On the other hand, the molecular weight distribution of the polyketone is preferably 1.5 to 2.5, more preferably 1.8 to 2.2. When the ratio is less than 1.5, the polymerization yield decreases. When the ratio is 2.5 or more, the moldability is poor. In order to control the molecular weight distribution, it is possible to adjust proportionally according to the amount of the palladium catalyst and the polymerization temperature. That is, when the amount of the palladium catalyst is increased or when the polymerization temperature is 100 ° C or higher, the molecular weight distribution becomes larger.

The melting point of the polyketone resin is usually in the range of 175 ° C to 300 ° C, specifically 210 ° C to 270 ° C. The polyketone of the present invention is characterized by a heat distortion temperature of 130 ° C or higher.

On the other hand, the polyketone of the present invention as described above is molded by a method such as extrusion and injection, and is manufactured as a microwave part such as a turntable roller or a turntable bracket.

In particular, the polyketone microwave component of the present invention has excellent mechanical strength, heat resistance, abrasion resistance and injection moldability.

3. Manufacturing Method

Hereinafter, a manufacturing method for manufacturing the polyketone microwave component as described above will be described.

The method for producing a polyketone microwave component of the present invention comprises the steps of: preparing a catalyst composition comprising an acid having a pKa value of 6 or less of a palladium compound and a bidentate compound of phosphorus; Preparing a mixed solvent (polymerization solvent) containing an alcohol (for example, methanol) and water; Conducting the polymerization in the presence of the catalyst composition and the mixed solvent to prepare a linear terpolymer of carbon monoxide, ethylene and propylene; Removing the remaining catalyst composition from the linear terpolymer with a solvent (e.g., alcohol and acetone) to obtain a polyketone resin; And mixing and extruding the polyketone resin.

As the palladium compound constituting the catalyst composition, palladium acetate can be used, and the amount of the palladium compound to be used is preferably 10 ^-3 to 10 ^-1 mole.

As the acid having a pKa value of 6 or less constituting the catalyst composition, at least one selected from the group consisting of trifluoroacetic acid, p-toluenesulfonic acid, sulfuric acid and sulfonic acid, preferably trifluoroacetic acid, may be used. 6 to 20 (mol) equivalents relative to the compound is appropriate.

Examples of the bidentate ligand compound constituting the catalyst composition include 1,3-bis [diphenylphosphino] propane (e.g., 1,3-bis [di (2-methoxyphenylphosphino)] propane, Bis [bis [anisyl] phosphinomethyl] -1,5-dioxaspiro [5,5] undecane and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis Methylene)) bis (bis (2-methoxyphenyl) phosphine) may be used, and the amount thereof is suitably 1 to 1.2 (mol) relative to the palladium compound.

The carbon monoxide, ethylene and propylene are liquid phase polymerized in a mixed solvent of alcohol (e.g. methanol) and water to produce a linear terpolymer. As the mixed solvent, a mixture of 100 parts by weight of methanol and 2 to 10 parts by weight of water may be used. If the content of water in the mixed solvent is less than 2 parts by weight, a ketal may be formed to lower the heat stability in the process. If the amount is more than 10 parts by weight, the mechanical properties of the product may be deteriorated.

The polymerization temperature is preferably in the range of 50 to 100 ° C and the reaction pressure in the range of 40 to 60 bar. The resulting polymer is recovered through filtration and purification processes after polymerization, and the remaining catalyst composition is removed with a solvent such as alcohol or acetone.

In the present invention, the obtained polyketone resin is mixed with glass fibers and then extruded by an extruder to finally obtain a blend composition. The blend is produced by putting into a twin-screw extruder, melt-kneading and extruding.

In this case, the extrusion temperature is preferably 230 to 260 ° C, and the screw rotation speed is preferably in the range of 100 to 300 rpm. If the extrusion temperature is less than 230 캜, kneading may not occur properly, and if the extrusion temperature exceeds 260 캜, problems related to the heat resistance of the resin may occur. If the screw rotational speed is less than 100 rpm, smooth kneading may not occur. If the screw rotation speed is more than 300 rpm, the glass fiber may be broken and the mechanical properties may be deteriorated.

A polyketone microwave component can be produced by preparing a resin by the above-mentioned method and injecting it.

Preferably, the microwave part is a microwave oven turntable roller or a turntable bracket.

The polyketone microwave oven parts manufactured according to the present invention were found to have excellent water resistance, abrasion resistance and injection moldability.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

Example 1

The linear alternating polyketone terpolymer of carbon monoxide and ethylene and propene is prepared by reacting palladium acetate, trifluoroacetic acid and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Bis (2-methoxyphenyl) phosphine). In the above, the content of trifluoroacetic acid with respect to palladium is 11 times the molar ratio, and the two stages of the first stage at a polymerization temperature of 80 ° C and the second stage at 84 ° C are carried out. The molar ratio of ethylene to propene in the polyketone terpolymer prepared above was 46 to 4. The melting point of the polyketone terpolymer was 220 占 폚, the LVN measured at 25 占 폚 by HFIP (hexa-fluoroisopropano) was 1.2 dl / g, the MI index was 60 g / 10 min and the MWD was 2.0. The polyketone terpolymer prepared above was pelletized on an extruder using a twin screw having a diameter of 40 mm and L / D = 32, which was operated at 250 rpm, and then injection molded to prepare a microwave component specimen .

Example 2

The linear alternating polyketone terpolymer of carbon monoxide and ethylene and propene is prepared by reacting palladium acetate, trifluoroacetic acid and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Bis (2-methoxyphenyl) phosphine). In the above, the content of trifluoroacetic acid with respect to palladium is 10 times the molar ratio, and the two stages of the first stage at a polymerization temperature of 78 占 폚 and 84 占 폚 are carried out. The molar ratio of ethylene to propene in the polyketone terpolymer prepared above was 46 to 4. The melting point of the polyketone terpolymer was 220 占 폚, the LVN measured at 25 占 폚 by HFIP (hexa-fluoroisopropano) was 1.4 dl / g, the MI index was 60 g / 10 min and the MWD was 2.0. The polyketone terpolymer prepared above was molded into a pellet on an extruder using a twin screw having a diameter of 40 mm and L / D = 32, which was operated at 250 rpm, and injection molded to prepare a microwave component specimen.

Example 3

The linear alternating polyketone terpolymer of carbon monoxide and ethylene and propene is prepared by reacting palladium acetate, trifluoroacetic acid and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Bis (2-methoxyphenyl) phosphine). In the above, the content of trifluoroacetic acid with respect to palladium is 9 times the molar ratio, and the two stages of the first stage at a polymerization temperature of 74 deg. C and the second stage at 84 deg. The molar ratio of ethylene to propene in the polyketone terpolymer prepared above was 46 to 4. The melting point of the polyketone terpolymer was 220 占 폚, the LVN measured at 25 占 폚 by HFIP (hexa-fluoroisopropano) was 1.6 dl / g, the MI index was 60 g / 10 min and the MWD was 2.0. The polyketone terpolymer prepared above was molded into a pellet on an extruder using a twin screw having a diameter of 40 mm and L / D = 32, which was operated at 250 rpm, and injection molded to prepare a microwave component specimen.

Example 4

The linear alternating polyketone terpolymer of carbon monoxide and ethylene and propene is prepared by reacting palladium acetate, trifluoroacetic acid and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Bis (2-methoxyphenyl) phosphine). In the above, the content of trifluoroacetic acid with respect to palladium is 10 times the molar ratio, and the two stages of the first stage at a polymerization temperature of 78 占 폚 and 84 占 폚 are carried out. The molar ratio of ethylene to propene in the polyketone terpolymer prepared above was 46 to 4. The melting point of the polyketone terpolymer was 220 占 폚, the LVN measured at 25 占 폚 by HFIP (hexa-fluoroisopropano) was 1.4 dl / g, the MI index was 60 g / 10 min and the MWD was 1.8. The polyketone terpolymer prepared above was molded into a pellet on an extruder using a twin screw having a diameter of 40 mm and L / D = 32, which was operated at 250 rpm, and injection molded to prepare a microwave component specimen.

Example 5

The linear alternating polyketone terpolymer of carbon monoxide and ethylene and propene is prepared by reacting palladium acetate, trifluoroacetic acid and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Bis (2-methoxyphenyl) phosphine). In the above, the content of trifluoroacetic acid with respect to palladium is 10 times the molar ratio, and the two stages of the first stage at a polymerization temperature of 78 占 폚 and 84 占 폚 are carried out. The molar ratio of ethylene to propene in the polyketone terpolymer prepared above was 46 to 4. The melting point of the polyketone terpolymer was 220 占 폚, the LVN measured at 25 占 폚 by HFIP (hexa-fluoroisopropano) was 1.4 dl / g, the MI index was 60 g / 10 min and the MWD was 2.2. The polyketone terpolymer prepared above was molded into a pellet on an extruder using a twin screw having a diameter of 40 mm and L / D = 32, which was operated at 250 rpm, and injection molded to prepare a microwave component specimen.

Comparative Example 1

Specimens for microwave parts were fabricated using PTFE, which was previously used as a material for microwave parts.

Property evaluation

The prepared pellets of the above Examples were injection molded to prepare specimens for microwave parts. The specimens were evaluated in the following manner in comparison with the specimens of the comparative examples, and the results are shown in Table 1 below.

1. Evaluation of Izod impact strength: ASTM D256.

2. Evaluation of moisture absorption rate: Measurement of moisture content after treatment for 24 hours at a temperature of 50 ° C and a relative humidity of 90%

3. Ring-on-Ring Type (Resin): A through-type test piece having an outer diameter of 25.6 mm, an inner diameter of 20 mm and a height of 15 mm was injection-molded and fixed to a testing machine. A press load of 6.6 kgf The test is carried out under the driving conditions of a speed of 10 cm / s. At this time, the non-abrasion amount was calculated using the following formula to evaluate the abrasion resistance. The smaller the amount of non-abrasion obtained, the better the abrasion resistance.

Non-wear amount = Wear weight (mg) / [Density (mg / mm3) X Pressure load (kgf) X Travel distance (km)]

* Test equipment: Trust type (Friction type abrasion tester)

4. cycle time (injection moldability evaluation sec): The time until the pellets prepared in the Example or Comparative Example were crystallized after melting was measured in sec.

The properties of Examples and Comparative Examples were as shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Properties IV: 1.2
MWD: 2.0 IV: 1.4
MWD: 2.0 IV: 1.6
MWD: 2.0 IV: 1.4
MWD: 1.8 IV: 1.4
MWD: 2.2 PTFE Izod impact strength (kJ / m2) 14 12 11 13 15 6 Product moisture absorption rate (%, 50 ℃ / 90% RH) 0.8 0.9 0.9 1.0 0.8 5.0 Wear resistance (mm3 / kg / km) 0.62 0.60 0.55 0.60 0.62 5.10 Injection cycle (sec) 17 17 17 17 17 23

As shown in Table 1, in the examples, the water absorption rate was lower than that of the comparative example, and the abrasion resistance was also evaluated to be very low. In addition, the injection molding cycle was short and injection moldability was excellent. Accordingly, the polyketone microwave oven parts manufactured through the embodiments of the present invention are well suited for application as microwave parts having excellent impact resistance, abrasion resistance, moisture resistance, and injection moldability.

Claims (4)

A polyketone copolymer comprising repeating units represented by the following general formulas (1) and (2), which is produced by injection molding a linear alternating polyketone having a ratio y / x of 0.03 to 0.3, wherein the inherent viscosity of the polyketone is 1.0 To 2.0 dl / g, and the abrasion resistance of the microwave part manufactured by injection molding is 1.0 mm < 3 > / kg / km or less.
- [- CH2CH2-CO] x- (1)
- [- CH2 --CH (CH3) - CO] y - (2)
(x and y represent mol% of each of the general formulas (1) and (2) in the polymer).
The method according to claim 1,
Wherein the microwave part is a turntable roller or a turntable bracket.
The method according to claim 1,
Wherein the microwave oven component has a thermal deformation temperature of 130 ° C or higher.
The method according to claim 1,
Wherein the microwave part has an injection cycle of less than 20 seconds.