KR100212967B1 - Process for preparing polyamide copolymers - Google Patents
Process for preparing polyamide copolymers Download PDFInfo
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- KR100212967B1 KR100212967B1 KR1019970039622A KR19970039622A KR100212967B1 KR 100212967 B1 KR100212967 B1 KR 100212967B1 KR 1019970039622 A KR1019970039622 A KR 1019970039622A KR 19970039622 A KR19970039622 A KR 19970039622A KR 100212967 B1 KR100212967 B1 KR 100212967B1
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- Prior art keywords
- caprolactam
- monomer
- initiator
- extruder
- lauryl lactam
- Prior art date
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- 239000004952 Polyamide Substances 0.000 title claims abstract description 18
- 229920002647 polyamide Polymers 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 claims abstract description 57
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- 239000003999 initiator Substances 0.000 claims abstract description 21
- 239000000178 monomer Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 18
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 13
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 230000000704 physical effect Effects 0.000 abstract description 4
- 150000001450 anions Chemical class 0.000 abstract description 2
- 238000010924 continuous production Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QISSLHPKTCLLDL-UHFFFAOYSA-N N-Acetylcaprolactam Chemical compound CC(=O)N1CCCCCC1=O QISSLHPKTCLLDL-UHFFFAOYSA-N 0.000 description 2
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 2
- 238000010539 anionic addition polymerization reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- -1 sodium and potassium Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
- C08G69/16—Preparatory processes
- C08G69/18—Anionic polymerisation
- C08G69/20—Anionic polymerisation characterised by the catalysts used
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polyamides (AREA)
Abstract
본 발명은 폴리아미드 공중합체 제조방법에 관한 것으로서, 더욱 상세하게는 이축압출기내에서 카프로락탐과 라우릴락탐 단량체, 알칼리금속 촉매, 아세틸화된 카프로락탐 개시제를 사용하여 액상피더를 통해 직접 압출기에 투입한 후 음이온 반응압출에 의한 연속공정으로 제조함으로써, 점도, 용융지수, 결정화도 등의 열적 ·물리적 특성 조절이 용이하여 다양한 제품에 응용할 수 있는 폴리아마이드 공중합체를 보다 경제적으로 제조할 수 있는 방법에 관한 것이다.The present invention relates to a method for preparing a polyamide copolymer, and more particularly, a caprolactam and lauryllactam monomer, an alkali metal catalyst, and an acetylated caprolactam initiator are introduced into the extruder directly through a liquid feeder in a twin screw extruder. After manufacturing in a continuous process by anion reaction extrusion, the thermal and physical properties such as viscosity, melt index, crystallinity, etc. can be easily controlled, and thus the polyamide copolymer which can be applied to various products can be manufactured more economically. will be.
Description
본 발명은 폴리아미드 공중합체 제조방법에 관한 것으로서, 더욱 상세하게는 이축압출기내에서 카프로락탐과 라우릴락탐 단량체, 알칼리금속 촉매, 아세틸화된 카프로락탐 개시제를 사용하여 액상피더를 통해 직접 압출기에 투입한 후 음이온 반응압출에 의한 연속공정으로 제조함으로써, 점도, 용융지수, 결정화도 등의 열적·물리적 특성 조절이 용이하여 다양한 제품에 응용할 수 있는 푤리아마이드 공중합체를 보다 경제적으로 제조할 수 있는 방법에 관한 것이다.The present invention relates to a method for preparing a polyamide copolymer, and more particularly, a caprolactam and lauryllactam monomer, an alkali metal catalyst, and an acetylated caprolactam initiator are introduced into the extruder directly through a liquid feeder in a twin screw extruder. After manufacturing in a continuous process by anion reaction extrusion, it is easy to control thermal and physical properties such as viscosity, melt index, crystallinity, etc. will be.
폴리아미드 공중합체는 일반적으로 나일론이라 호칭되며, 아미드 결합으로 연결되어 있고 원칙적으로 사슬모양의 고분자로써 대부분이 섬유로 될 수 있는 성질을 지니고 있는 물질이다. 따라서, 이러한 공중합체는 특히 합성섬유로 많이 사용되며 흡수성이 적은 부분에 널리 사용되고 있다.Polyamide copolymers are generally referred to as nylon and are linked by amide bonds and are, in principle, chain-like polymers, most of which can be made into fibers. Therefore, such a copolymer is particularly used as a synthetic fiber and is widely used in the part having low water absorption.
폴리아미드 공중합체의 제조방법으로는 압출기를 통한 락탐의 음이온 중합기술[미국특허 제 4,067,861 호]이 있는데, 이는 일정하고 균일한 토출량과 물성을 얻기 위해 압출기 몸체(body)와 다이(die) 사이에 미터링 펌프(metering pump)를 설치한 공정으로, 여기에는 촉매처리 및 투입방법에 대한 언급이 없다.A method for preparing a polyamide copolymer includes anion polymerization technology of lactam through an extruder (US Pat. No. 4,067,861), which is formed between the extruder body and the die to obtain a uniform and uniform discharge amount and physical properties. It is a process in which a metering pump is installed, and there is no mention of a catalyst treatment and a charging method.
또한, 카프로락탐의 다단계 음이온 중합기술[영국특허 제 2,096,115 호]이 개시되어 있지만, 이 또한 어느 정도 미리 중합을 시킨 프리폴리머(Prepolymer) 합성단계를 거친 후에 압출기에 투입하여야 하는 번거로움이 뒤따른다.In addition, although a multi-stage anion polymerization technique (UK Patent No. 2,096,115) of caprolactam has been disclosed, this also has to be introduced to the extruder after the prepolymer synthesis step which has been polymerized to some extent.
한편 폴리아미드의 연속 중합에 관한 기술[미국특허 제 3,793,255 호]로는 스파이럴 튜브를 통한 폴리아미드 합성에 관한 기술이 개시되어 있다. 그러나, 이 방법은 스파이럴 튜브에 의한 합성방법이기 때문에 반응 관을 통하여 유출되는 고분자를 곧바로 압출 성형이나 방사하기 어려운 공정으로 되어있다.On the other hand, a technique for the continuous polymerization of polyamides (US Pat. No. 3,793,255) discloses a technique for polyamide synthesis through a spiral tube. However, since this method is a synthetic method using a spiral tube, it is difficult to directly extrude or spin the polymer flowing out through the reaction tube.
따라서, 현재 보다 단순하면서도 중합후 곧바로 압출성형 등이 가능한 폴리아미드 공중합체의 새로운 제조방법이 절실히 요구되고 있는 실정이다.Therefore, there is an urgent need for a new method for preparing a polyamide copolymer which is simpler and can be extruded immediately after polymerization.
본 발명은 상기의 문제점을 보완하고자 이축압출기내에 카프로락탐 단량체와 라우릴락탐 단량체를 각각 서로 다른 액상피더를 통해 압출기내에 공급하여 폴리아미드 공중합체를 중합함으로써 연속적으로 압출성형이 가능한 새로운 제조방법을 제공하는 데 그 목적이 있다.The present invention provides a novel production method capable of continuously extruding by supplying the caprolactam monomer and lauryl lactam monomer in the twin-screw extruder in the extruder through different liquid feeders to polymerize the polyamide copolymer to complement the above problems. Its purpose is to.
본 발명은 이축압출기내에 라우릴락탐과 카프로락탐의 단량체, 알칼리금속 촉매, 아세틸화된 카프로락탐 개시제를 함께 투입하되, 하나의 액상 피더를 통해 라우릴락탐 단량체와 알칼리금속 촉매를 압출기내로 투입하고, 또 다른 액상 피더를 통해 카프로락탐 단량체와 아세틸화된 카프로락탐 개시제를 압출기내에 투입하여 중합한 뒤, 연속압출가공하여 폴리아미드 공중합체를 제조하는 방법을 그 특징으로 한다In the present invention, a monomer of lauryl lactam and caprolactam, an alkali metal catalyst and an acetylated caprolactam initiator are added together in a twin screw extruder, and a lauryl lactam monomer and an alkali metal catalyst are introduced into an extruder through one liquid feeder. Another method is characterized in that a caprolactam monomer and an acetylated caprolactam initiator are introduced into an extruder through a liquid feeder, followed by polymerization, followed by continuous extrusion to prepare a polyamide copolymer.
이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.
본 발명은 한 대의 이축압출기를 사용하여 카프로락탐 및 라우릴락탐의 공중합 및 연속적인 압출성형이 가능한 공정으로, 기존의 축중합반응에 의해 만들어진 같은 분자량의 폴리아미드 공중합체보다 반응시간이 매우 짧고, 반응 설비가 간단하여 저비용으로 폴리아미드 공중합체를 제조하는 방법에 관한 것이다.The present invention is a process that enables the copolymerization and continuous extrusion of caprolactam and lauryl lactam using one twin screw extruder, and the reaction time is much shorter than that of the polyamide copolymer of the same molecular weight produced by the conventional polycondensation reaction, The reaction plant is simple and relates to a method for producing a polyamide copolymer at low cost.
본 발명에서는 단량체로 카프로락탐과 라우릴락탐을 사용하고, 촉매로는 알칼리 금속을 사용하고, 개시제(Initiator)로는 아세틸화된 카프로락탐을 사용한다.In the present invention, caprolactam and lauryllactam are used as monomers, alkali metals are used as catalysts, and acetylated caprolactams are used as initiators.
본 발명에서는 단량체로서 카프로락탐과 라우릴락탐을 함께 사용하는 바, 이들 상호간의 혼합 비율을 적절히 조절하여 공중합체의 사용용도에 따라 점도, 녹는점 및 결정화도를 조절할 수 있고, 이로써 다양한 상품에 적용할 수 있는 장점이 있다.In the present invention, when caprolactam and lauryllactam are used together as monomers, the mixing ratio between them can be adjusted appropriately to adjust the viscosity, melting point and crystallinity according to the use of the copolymer, thereby applying to various products. There are advantages to it.
또한, 촉매로서 나트륨, 칼륨 등의 알칼리 금속을 사용하며, 이들 촉매는 단량체 총량 100 몰에 대해 0.1 ∼ 2.0 몰만큼 사용한다. 촉매의 사용량이 0.1 몰 미만이면 고분자량의 중찹체를 얻을 수 없고, 2.0 몰을 초과 사용할 때는 잔존 촉매량이 많고 점도가 저하되어 바람직하지 않다.Moreover, alkali metals, such as sodium and potassium, are used as a catalyst, These catalysts are used by 0.1-2.0 mol with respect to 100 mol of monomer total amounts. If the amount of the catalyst used is less than 0.1 mole, a high molecular weight chopped body cannot be obtained. When the amount of the catalyst used is more than 2.0 mole, the amount of the remaining catalyst is large and the viscosity decreases, which is not preferable.
본 발명은 개시제로서 아세틸화된 카프로락탐(N-Acetyl caprolactam)을 사용하며, 그 사용량은 단량체 총량 100 몰에 대해 0.1 ∼ 2.0 몰을 사용한다. 상기의 조건에서 개시제의 함량이 0.1 몰 미만인 경우 고분자량의 중합체를 얻을 수 없고, 반면 2.0 몰을 초과할 경우 잔존 개시제의 양이 많고 점도가 저하되어 문제시된다.The present invention uses acetylated caprolactam as an initiator, and the amount of the acetylated caprolactam is used in an amount of 0.1 to 2.0 moles based on 100 moles of the total monomer. Under the above conditions, when the content of the initiator is less than 0.1 mole, a high molecular weight polymer cannot be obtained. On the other hand, when the content of the initiator exceeds 2.0 mole, the amount of the remaining initiator is large and the viscosity decreases, which is problematic.
본 발명에 따른 폴리아미드 공중합체의 제조공정은 상기에서 설명한 단량체, 촉매, 개시제를 이축압출기내에 직접 투입하여 60 ∼ 270℃ 온도범위에서 중합하는 방법으로 수분이내에 반응이 완료되는 반응공정이다,The process for producing a polyamide copolymer according to the present invention is a reaction process in which the reaction is completed within a few minutes by directly injecting the monomer, catalyst, and initiator described above into a twin screw extruder and polymerizing in a temperature range of 60 to 270 ° C.
이때, 이축압출기내로 단량체, 촉매, 개시제를 투입하는 방법은 이축압출기내의 2 개의 액상 피더(feeder)를 사용하여 각각 라우릴락탐 단량체와 알칼리금속 촉매의 혼합물과 카프로락탐 단량체와 아세틸화된 카프로락탐 개시제의 혼합물을 압출기에 투입한다.At this time, the method of injecting the monomer, catalyst, and initiator into the twin screw extruder is a mixture of lauryl lactam monomer and alkali metal catalyst, caprolactam monomer and acetylated caprolactam initiator using two liquid feeders in the twin screw extruder, respectively Is added to the extruder.
이를 더욱 자세히 살펴보면, 첫 번째로 알칼리금속 촉매는 질소 및 아르곤 등의 불활성 기체하에서 라우릴락탐 단량체와 반응시킨 후 압출기내에 액상으로 투입된다. 이때 넣어준 과량의 라우릴락탐 단량체의 일부가 소량의 촉매와 반응하여 나트륨 라우릴락탐이 된 후 함께 녹아있는 라우릴락탐과 압출기에 투입되는 것이다. 라우릴락탐은 반응속도가 느리기 때문에 투입되기 전에 일정시간동안 반응속도 조절을 위해 180 ∼ 200℃에서 교반하는 것이 바람직하다.In more detail, first, the alkali metal catalyst is reacted with the lauryl lactam monomer under an inert gas such as nitrogen and argon, and then introduced into the liquid phase in the extruder. At this time, a part of the excess lauryl lactam monomer is reacted with a small amount of catalyst to become sodium lauryl lactam and then injected into the lauryl lactam and the extruder. Since lauryl lactam is slow in reaction rate, it is preferable to stir at 180 to 200 ° C. for a certain time to adjust the reaction rate before being added.
두 번째로 아세틸화된 카프로락탐 개시제는 녹는점이 낮은 카프로락탐과 130℃이하의 온도에서 액상으로 섞은 후 혼합물의 형태로 압출기에 투입된다. 130℃ 이하인 이유는 개시제의 끓는점이 134 ∼ 135℃이기 때문이다.Secondly, the acetylated caprolactam initiator is mixed with the low melting caprolactam in a liquid phase at a temperature of 130 ° C. or lower, and then introduced into the extruder in the form of a mixture. The reason for being 130 degrees C or less is because the boiling point of an initiator is 134-135 degreeC.
이하 본 발명을 실시예에 의거 더욱 상세히 설명하겠는 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by Examples.
실시예 1 ∼ 4 및 비교예 1 ∼ 2Examples 1-4 and Comparative Examples 1-2
라우릴락탐과 카프로락탐 단량체의 몰비를 10 / 90, 30 / 70, 70 / 30, 90 / 10로 하고, 이들 각각에 대하여 촉매 및 개시제 함량을 상기 단량체 총량 100 몰에 대하여 0.5, 1.0, 1.5 몰로 하여 실시하였다. 이때, 사용된 이축압출기는 독일 베르너 앤드 플라이더러(Werner pfleiderer)사 제품으로, 길이와 지름의 비가 42이고, 6개의 가열구역을 가진 지에스케이(ZSK)-25 모델을 사용하였다. 또한 여기서 사용된 단량체는 프랑스 엘프 아토켐(ELF Atochem)사의 라우릴라탐 플레이크(Lauryl lactam flake)와 한국카프로락탐사의 카프로락탐 파우더를 사용하였고, 촉매로는 나트륨, 개시제로는 N-아세틸 카프로락탐을 사용하였다,The molar ratio of lauryl lactam and caprolactam monomer is 10/90, 30/70, 70/30, 90/10, and for each of them, the catalyst and initiator content is 0.5, 1.0, 1.5 mole with respect to 100 moles of the total amount of the monomer. It was carried out by. At this time, the twin screw extruder was manufactured by Werner pfleiderer of Germany, and used ZSK-25 model having 6 heating zones with a length and diameter ratio of 42. In addition, the monomers used were Lauryl lactam flakes from ELF Atochem, France, and caprolactam powders from Caprolactam Korea.The catalysts were sodium and N-acetyl caprolactam as an initiator. Was used,
앞에서 설명한 반응 혼합물, 즉 알칼리금속 촉매/라우릴락탐 단량체의 혼합물과 N-아세틸 카프로락탐 개시제/카프로락탐 혼합물을 각각 서로 다른 2개의 액상 피더(feeder)를 사용하여 이축압출기 투입구에 투입하였다.The reaction mixture described above, i.e., the mixture of the alkali metal catalyst / lauryllactam monomer and the N-acetyl caprolactam initiator / caprolactam mixture, was introduced into the twin screw extruder inlet using two different liquid feeders.
이렇게 하여 얻어진 공중합체를 분석한 결과는 다음 표 1에 기재된 바와 같다.The result of analyzing the copolymer thus obtained is as described in Table 1 below.
이와 같은 방법으로 제조된 폴리아미드 공중합체는 카프로락탐과 라우릴락탐의 양 물성을 접목시킨 것으로, 두 단량체간의 혼합비율을 조절함으로써 점도, 용융지수, 결정화도 등의 열적 물리적 특성을 용이하게 저정할 수 있어 다양한 제품에 적용할 수 있고, 또한 반응시간을 절약할 수 있을 뿐만 아니라 반응설비가 간단하여 보다 경제적으로 폴리아미드 공중합체를 제조할 수 있는 효과가 있다.The polyamide copolymer prepared by the above method combines the properties of caprolactam and lauryllactam, and by controlling the mixing ratio between the two monomers, the physical properties such as viscosity, melt index and crystallinity can be easily stored. It can be applied to a variety of products, and also can not only save the reaction time, but also the reaction equipment is simple to produce a polyamide copolymer more economically.
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