KR20000055272A - Method for preparing thermoplastic styrenl/acrylonitrile copolymer - Google Patents

Method for preparing thermoplastic styrenl/acrylonitrile copolymer Download PDF

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KR20000055272A
KR20000055272A KR1019990003799A KR19990003799A KR20000055272A KR 20000055272 A KR20000055272 A KR 20000055272A KR 1019990003799 A KR1019990003799 A KR 1019990003799A KR 19990003799 A KR19990003799 A KR 19990003799A KR 20000055272 A KR20000055272 A KR 20000055272A
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weight
parts
copolymer
life
unsaturated nitrile
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KR100522299B1 (en
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김정현
이병도
임용환
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유현식
제일모직 주식회사
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00Processes of polymerisation
    • C08F2/12Polymerisation in non-solvents
    • C08F2/16Aqueous medium
    • C08F2/18Suspension polymerisation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00Processes of polymerisation
    • C08F2/38Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/42Nitriles

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

PURPOSE: A method for preparing a thermoplastic nitrile-based copolymer which maintains excellent mechanical and thermal properties as well as can minimize the content of residual monomers that is increased according to low content of unsaturated nitrile compound is provided. CONSTITUTION: A method for preparing a thermoplastic nitrile-based copolymer according to the present invention comprises suspending copolymer of unsaturated nitrile compound with aromatic vinyl compound in water wherein the method is characterized in that a mixed initiator containing two or more initiators in which one has 10 hours half-life less than 80 degees celsius and the other has 10 hours half-life more than 90 degees celsius is used as a polymerization initiator in the amount of 0.01 to 0.8 parts by weight based on 100 parts by weight of the total monomers.

Description

열가소성 니트릴계 공중합체의 제조방법{METHOD FOR PREPARING THERMOPLASTIC STYRENL/ACRYLONITRILE COPOLYMER}Manufacturing method of thermoplastic nitrile copolymer {METHOD FOR PREPARING THERMOPLASTIC STYRENL / ACRYLONITRILE COPOLYMER}

본 발명은 열가소성 니트릴계 공중합체의 제조방법에 관한 것으로, 더욱 상세하게는 불포화 니트릴 화합물과 방향족 비닐화합물로 이루어진 공중합체를 수중현탁법에 의해 제조함에 있어서, 반감기가 상이한 2종 이상의 개시제를 사용하여 중합율을 극대화하므로써 불포화 니트릴 화합물의 함유율을 낮추면서도 잔류단량체의 함량을 극소화할 수 있는 열가소성 니트릴계 공중합체의 제조방법에 관한 것이다.The present invention relates to a method for producing a thermoplastic nitrile copolymer, and more particularly, to preparing a copolymer of an unsaturated nitrile compound and an aromatic vinyl compound by an underwater suspension method, using two or more kinds of initiators having different half-lives. The present invention relates to a method for producing a thermoplastic nitrile copolymer which can minimize the content of residual monomers while lowering the content of unsaturated nitrile compounds by maximizing the polymerization rate.

불포화 니트릴 성분을 함유한 공중합체, 특히 아크릴로니트릴 공중합체는 투명성, 열안정성 및 기계적 성질이 우수하여 상업적으로 많이 사용되고 있다. 이런 그룹의 공중합체 중에서도 아크릴로니트릴을 낮은 비율로 함유하고 있는 스티렌-아크릴로니트릴 공중합체는 상기의 특징에 더하여 ABS 알로이에 있어 상용화제로 기능할 수 있고, 또 유동성이 우수하여 스티렌계 수지와의 혼합가공시(블랜드) 가공성 향상에도 기여할 수 있을 것으로 기대된다.Copolymers containing unsaturated nitrile components, in particular acrylonitrile copolymers, are widely used commercially because of their excellent transparency, thermal stability and mechanical properties. Among the copolymers of this group, styrene-acrylonitrile copolymers containing acrylonitrile in low proportions, in addition to the above characteristics, can function as a compatibilizer in ABS alloys and have excellent fluidity, It is expected to contribute to the improvement of machinability in blend processing.

그러나 이와 같은 용도로 열가소성 니트릴계 공중합체를 제조하는 경우에는 중합체중에 잔류하는 단량체를 줄이는 것이 필요하다. 특히 잔류 스티렌 단량체는 환경호르몬으로서 인체에 대한 독성이 예상되므로 그 잔류량을 가능한한 최소로 감소시킬 필요가 있다.However, when preparing a thermoplastic nitrile copolymer for this purpose, it is necessary to reduce the monomer remaining in the polymer. In particular, residual styrene monomers are expected to be toxic to humans as environmental hormones. Therefore, it is necessary to reduce the residual amount to the minimum possible.

그런데, 종래에는 불포화 니트릴화합물과 방향족 비닐화합물의 공중합체를 수중 현탁중합방법에 의해 제조할 경우 단일 개시제 시스템을 이용하여 제조하였다. 그러나, 이와 같이 단일 개시제 시스템을 이용하면 불포화 니트릴화합물과 방향족 비닐화합물간의 반응성 차이에 기인한 아조트로픽(Azeotropic) 조성차에 따라 중합이 종료한 시점에서 환경문제를 유발할 수 있는 방향족비닐 화합물의 잔류 단량체 함량이 전체 사용 단량체량에 대해 약 5∼20 중량% 정도 남게 된다.However, conventionally, when a copolymer of an unsaturated nitrile compound and an aromatic vinyl compound was prepared by the suspension polymerization method in water, it was prepared using a single initiator system. However, using such a single initiator system, residual monomers of aromatic vinyl compounds that may cause environmental problems at the end of polymerization due to azotropic composition differences due to the difference in reactivity between unsaturated nitrile compounds and aromatic vinyl compounds. The content remains about 5 to 20% by weight based on the total amount of monomers used.

이러한 잔류 단량체의 양을 감소시키는 방법으로, 스트리핑(Stripping) 혹은 회수법(Recovery) 등에 의해 잔류 단량체를 제거하는 방법이 공지되어 있다. 그러나, 이러한 방법을 사용하게 되면 일부 미반응 단량체의 제거는 가능하나 그중 일부는 조성이 불균일한 상태로 중합물에 잔류하게 되어 최종 기계적 성질에 나쁜 영향을 미치게 되며 원하는 품질의 공중합체를 수득할 수 없게 되는 문제점이 발생한다.As a method of reducing the amount of such residual monomers, a method of removing residual monomers by stripping or recovery is known. However, using this method, it is possible to remove some unreacted monomers, but some of them remain in the polymer in a non-uniform composition, which adversely affects the final mechanical properties and makes it impossible to obtain a copolymer of the desired quality. Problem occurs.

본 발명의 목적은 상술한 바와 같은 종래 기술의 문제점을 극복하기 위한 것으로, 불포화 니트릴화합물과 방향족 비닐화합물의 중합반응시 반감기가 상이한 2종 이상 개시제를 혼합사용함으로써 각각의 개시제가 초기와 후기의 개시작용을 2단계로 진행하게 하여 반응성을 조절함으로써 고유의 우수한 기계적, 열적 특성을 유지하면서도 낮은 불포화 니트릴화합물 함량에 따라 증가된 잔류 단량체의 함량을 극소화할 수 있는 열가소성 니트릴계 공중합체의 제조방법을 제공하는 것이다.An object of the present invention is to overcome the problems of the prior art as described above, by the use of two or more kinds of initiators having different half-life in the polymerization reaction of an unsaturated nitrile compound and an aromatic vinyl compound, each initiator is initiated early and late Providing a method for preparing a thermoplastic nitrile copolymer which can minimize the amount of residual monomers increased according to the low unsaturated nitrile compound content while maintaining its excellent mechanical and thermal properties by controlling the reactivity by performing the action in two steps. It is.

즉, 본 발명은 불포화 니트릴 화합물과 방향족 비닐화합물로 이루어진 공중합체를 수중현탁법에 의해 제조함에 있어서, 중합개시제로 10시간 반감기가 80℃ 이하인 개시제와 10시간 반감기가 90℃ 이상인 2종 이상의 개시제를 혼합한 것을 전체 사용 단량체 100중량부에 대하여 0.01 내지 0.8 중량부 사용하는 것을 특징으로 하는 열가소성 니트릴계 공중합체의 제조방법을 제공하는 것이다.That is, in the present invention, in the preparation of a copolymer of an unsaturated nitrile compound and an aromatic vinyl compound by the water suspension method, a polymerization initiator may include an initiator having a half-life of 80 hours or less for 10 hours and two or more initiators having a half-life of 90 hours or more for a 10-hour half life. It is to provide a method for producing a thermoplastic nitrile copolymer characterized in that the mixture is used 0.01 to 0.8 parts by weight based on 100 parts by weight of the total monomers used.

이하에서 본 발명을 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.

본 발명의 열가소성 니트릴계 공중합체의 제조방법은 불포화 니트릴화합물과 방향족 비닐화합물로 이루어진 공중합체를 수중현탁법으로 제조함에 있어서, 불포화 니트릴화합물 단량체와 방향족 비닐화합물 단량체와의 반응성 차이에 따른 "1차 공중합공정"과 방향족 비닐화합물의 미반응 잔류단량체를 최소화하는 공정인 "2차 공중합공정"으로 진행된다.In the method for preparing the thermoplastic nitrile copolymer of the present invention, in the preparation of a copolymer of an unsaturated nitrile compound and an aromatic vinyl compound in the water suspension method, the "primary" according to the difference in reactivity between the unsaturated nitrile compound monomer and the aromatic vinyl compound monomer Copolymerization process "and" secondary copolymerization process "which is a process for minimizing the unreacted residual monomer of the aromatic vinyl compound.

본 발명에서 사용되는 중합개시제는 1차 공중합 공정에서는 반감기가 낮은 즉, 10시간 반감기가 80℃ 이하인 개시제가 개시반응을 주도하게 되며, 2차 공중합 공정에서는 반감기가 높은, 즉, 10시간 반감기가 90℃ 이상인 개시제가 개시반응을 주도하게 된다. 구체적으로는 저온에서의 "1차 공중합 공정"에 관여하는 반감기가 낮은 개시제로는 디-t-부틸퍼옥사이드 또는 벤조일퍼옥사이드(10시간 반감기=74℃)를 사용할 수 있고, 고온에서 "2차 공중합 공정"에 관여하는 개시제로는 1,1-비스(t-부틸퍼옥시)시클로헥산 또는 1,1-비스(t-부틸퍼옥시)3,3,5-트리메틸-시클로헥산(10시간 반감기 90℃)를 사용할 수 있다. 이러한 중합개시제는 반응계에 한 번에 첨가하거나 혹은 연속적으로 첨가하는 것이 가능하다.The polymerization initiator used in the present invention has a low half-life in the first copolymerization process, that is, the initiator having a half-life of 80 hours or less for 10 hours leads the initiation reaction. Initiator at or above the temperature is leading to the initiation reaction. Specifically, di-t-butyl peroxide or benzoyl peroxide (10 hours half-life = 74 ° C) may be used as an initiator having a low half-life involved in the "primary copolymerization process" at low temperature. Initiators involved in "copolymerization process" include 1,1-bis (t-butylperoxy) cyclohexane or 1,1-bis (t-butylperoxy) 3,3,5-trimethyl-cyclohexane (10 hours half-life 90 ° C.) can be used. Such a polymerization initiator can be added to the reaction system at once or continuously.

본 발명에서 사용되는 2종 이상의 개시제의 함량은 전체적으로 중합개시 온도 및 단량체의 조성비 등의 중합조건에 따라 달라지게 되는데, 바람직하게는 전체 사용 단량체 100 중량부에 대하여 0.01-0.8 중량부의 범위로 사용하는 것이 좋고, 더욱 바람직하게는 0.2-0.6 중량부의 범위이다. 상기 두 종류의 개시제의 상대적인 함량비에는 특별한 제한이 없고, 일례로 전체 사용 단량체 100 중량부에 대하여 각각 0.1-0.3 중량부씩 사용할 수 있다.The content of two or more initiators used in the present invention will vary depending on the polymerization conditions such as the polymerization start temperature and the monomer composition ratio as a whole, and preferably in the range of 0.01-0.8 parts by weight based on 100 parts by weight of the total monomers used. It is preferable that it is in the range of 0.2 to 0.6 parts by weight. There is no particular limitation on the relative content ratio of the two kinds of initiators, and for example, 0.1 to 0.3 parts by weight may be used based on 100 parts by weight of the total used monomers.

본 발명에서 분자량 조절제로는 t-도데실 멀캡탄(TDM)을 전체 사용 단량체 100중량부에 대하여 0.10-0.30중량부 사용하는 것이 바람직하다.In the present invention, as the molecular weight modifier, t-dodecyl mercaptan (TDM) is preferably used in an amount of 0.10-0.30 parts by weight based on 100 parts by weight of the total monomers used.

본 발명에서의 공중합체의 제조원료 단량체 중 불포화 니트릴화합물 단량체는 아크릴로니트릴, 메타아크릴로니트릴 또는 이들의 혼합물로 구성되는 그룹으로부터 선택되고, 방향족 비닐화합물 단량체는 스티렌, α-메틸스티렌, p-메틸스티렌, t-부틸스티렌, 할로겐화 스티렌 또는 이들의 혼합물로 구성되는 그룹으로부터 선택되는 것이 사용될 수 있다.The unsaturated nitrile compound monomer in the raw material monomer of the copolymer of the present invention is selected from the group consisting of acrylonitrile, methacrylonitrile or a mixture thereof, and the aromatic vinyl compound monomer is styrene, α-methylstyrene, p- Any one selected from the group consisting of methyl styrene, t-butyl styrene, halogenated styrene or mixtures thereof can be used.

공중합반응에서 사용되는 현탁제는 통상의 무기계 현탁제, 셀룰로오스 유도체, 폴리비닐알코올류 등이며 필요에 따라 현탁보조제로 소량의 유용성 또는 수용성 계면활성제를 병용할 수 있다. 바람직한 현탁제의 사용량은 전체 사용된 단량체 100중량부에 대해 0.005∼1.5 중량부이며, 현탁제의 사용량이 0.005중량부 미만이면 현탁안정성이 나빠져서 입도분포가 불균일하게 되고 과대하게 뭉쳐진 덩어리를 생성하기도 한다. 이와 반대로 1.5중량부를 초과하면 입자가 미세하여 후처리 공정의 시간이 늘어나고 생산성이 크게 저하된다.The suspending agents used in the copolymerization reaction are conventional inorganic suspending agents, cellulose derivatives, polyvinyl alcohols, and the like, and a small amount of oil-soluble or water-soluble surfactant can be used together as a suspending aid as necessary. The preferred amount of the suspending agent is 0.005 to 1.5 parts by weight based on 100 parts by weight of the total used monomer, and if the amount of the suspending agent is less than 0.005 parts by weight, the suspension stability is poor, resulting in uneven particle size distribution and excessively agglomeration. . On the contrary, when the content is more than 1.5 parts by weight, the particles are fine, which increases the time of the post-treatment process and greatly reduces the productivity.

반응매체인 물의 사용량은 전체 투입 단량체 100중량부에 대해 50-500 중량부의 범위로 하는 것이 좋다. 물의 사용량이 50중량부 미만이면 분산특성 및 반응열의 분산 및 제거가 곤란하게 되며, 500중량부를 초과하면 분산상태에 악영향을 미치고 더 많은 분산제를 필요로 하며, 물중에 용해되는 불포화 니트릴화합물 단량체량의 증가로 반응중 분산상태의 악화와 최종 공중합체에 있어서 니트릴 성분의 함량 저하를 초래하며 분자량도 감소하게 된다.The amount of water used as the reaction medium is preferably in the range of 50 to 500 parts by weight based on 100 parts by weight of the total monomer input. If the amount of water used is less than 50 parts by weight, it is difficult to disperse and remove the dispersion characteristics and reaction heat. If the amount is more than 500 parts by weight, the amount of unsaturated nitrile monomers dissolved in water adversely affects the dispersion state and requires more dispersant. The increase leads to a deterioration of the dispersed state during the reaction and a decrease in the content of the nitrile component in the final copolymer and a decrease in the molecular weight.

본 발명에서의 열가소성 니트릴계 공중합체의 중합 방법은 통상의 수중현탁중합 방법과 큰 차이는 없다. 다만 불포화 니트릴화합물 단량체와 방향족 비닐화합물 단량체의 반응성이 다르기 때문에 중합시간이 경과됨에 따라 계의 반응을 계속 유지시켜줄 수 있는 상기에 제시한 상이한 종류의 개시제의 적절한 사용과 최적의 시간-온도 거동을 선정할 필요가 있다.The polymerization method of the thermoplastic nitrile copolymer in the present invention is not significantly different from the usual in-water suspension polymerization method. However, due to the different reactivity of unsaturated nitrile monomers and aromatic vinyl monomers, the appropriate time and temperature behavior of the different types of initiators described above are selected to maintain the reaction of the system as the polymerization time elapses. Needs to be.

본 발명에서 제조되는 불포화 니트릴화합물-방향족 비닐화합물 공중합체는 불포화 니트릴화합물 단량체 성분의 함유율이 10-20 중량%이고 방향족 비닐화합물 단량체 성분의 함유율이 80-90 중량%인 것이다. 더욱 바람직하게, 불포화 니트릴화합물 단량체 성분의 함유율이 10-15 중량%이고, 방향족 비닐화합물 단량체 성분의 함유율이 85-90 중량%인 것이 좋다. 불포화 니트릴 화합물 단량체 성분의 함유율이 10중량% 미만이면 공중합체의 내약품성 및 기계적 특성이 불량하게 되고, 이와 반대로 니트릴화합물 단량체 성분의 함유율이 20중량%를 넘으면 본 발명이 의도하는 효과를 수득할 수 없게 된다.The unsaturated nitrile compound-aromatic vinyl compound copolymer prepared in the present invention is that the content of the unsaturated nitrile compound monomer component is 10-20% by weight and the content of the aromatic vinyl compound monomer component is 80-90% by weight. More preferably, the content of the unsaturated nitrile compound monomer component is 10-15% by weight, and the content of the aromatic vinyl compound monomer component is 85-90% by weight. When the content of the unsaturated nitrile compound monomer component is less than 10% by weight, the chemical resistance and mechanical properties of the copolymer are poor. On the contrary, when the content of the nitrile compound monomer component is more than 20% by weight, the intended effect of the present invention can be obtained. There will be no.

또한, 본 발명에서 제조된 불포화 니트릴화합물-방향족 비닐화합물 공중합체는 중량평균 분자량(Mw)과 수평균분자량(Mn)의 비(Mw/Mn)가 2미만, 바람직하게 1.8미만이다. 중량평균 분자량(Mw)과 수평균분자량(Mn)의 비(Mw/Mn)는 통상적으로 분자량분포의 정도에 대한 척도로서 이용되는데, 상기 비가 2를 초과하는 경우에는 불포화 니트릴화합물-방향족 비닐화합물 공중합체가 증가된 유동성에 비하여 기계적, 열적 물성 등이 불량해지기 때문에 최종 수지물 또한 불량한 내충격성 등의 기계적 물성을 갖게 된다.In addition, the unsaturated nitrile compound-aromatic vinyl compound copolymer prepared in the present invention has a ratio (Mw / Mn) of weight average molecular weight (Mw) and number average molecular weight (Mn) of less than 2, preferably less than 1.8. The ratio (Mw / Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) is usually used as a measure of the degree of molecular weight distribution, in which case the unsaturated nitrile compound-aromatic vinyl compound air is used. Since the coalescence is poor in mechanical and thermal properties compared to the increased flowability, the final resin also has mechanical properties such as poor impact resistance.

본 발명에서 제조된 불포화 니트릴화합물-방향족 비닐화합물 공중합체는 고유점도가 0.50∼0.60이며, 더욱 바람직하게는 0.55 내외이다. 고유점도가 0.50 미만일 경우에는 본 발명에서 목적으로 하는 기계적 특성의 향상을 기대할 수 없게 되고, 이와 반대로 0.60을 초과하는 경우에는 오히려 기계적 물성이 나빠지게 된다.The unsaturated nitrile compound-aromatic vinyl compound copolymer prepared in the present invention has an intrinsic viscosity of 0.50 to 0.60, more preferably about 0.55. When the intrinsic viscosity is less than 0.50, it is impossible to expect an improvement in the mechanical properties aimed at in the present invention. On the contrary, when the intrinsic viscosity exceeds 0.60, the mechanical properties become worse.

본 발명은 다음의 실시예에 의하여 보다 구체화될 것이며, 다음의 실시예는 본 발명을 예시하기 위한 목적으로 기재된 것이며, 본 발명의 보호범위를 제한하고자 하는 것은 아니다. 후술하는 실시예에서 별도의 언급이 없는 한 "부"는 모두 중량을 기준으로 하며 전체 사용 단량체의 양을 100으로 했을 때의 값이다.The invention will be further elucidated by the following examples which are set forth for the purpose of illustrating the invention and are not intended to limit the scope of the invention. In the following examples, unless otherwise mentioned, all parts are "parts" based on weight and are values when the total amount of monomers used is 100.

실시예 1Example 1

내용적 300L인 방해판, 교반장치 및 가열용 쟈켓(Jacket)이 장착된 스테인레스제 고압반응기에 아크릴로니트릴 13부, 스티렌 87부를 투입하였다. 분산제로는 PCT(Calcium Phosphate Tribasic)를 0.47부 사용하였으며, 중합개시제로는 반감기가 낮은 벤조일 퍼옥사이드 0.30부와 반감기가 높은 1,1-비스(t-부틸퍼옥시)3,3,5-트리메틸-시클로헥산 0.10부를 혼합하여 사용하였다. 또한 분자량 조절을 위해서는 TDM(t-Dodecyl Mercaptane)을 0.3부 사용하였으며 전체적으로 분산매로는 이온교환수를 123부 사용하였다. 상술한 반응혼합물들을 200rpm의 속도로 일정하게 교반시켰으며 중합반응 동안 반응혼합물의 온도조절은 초기승온을 80℃까지로 하여 4시간 동안 유지시켰다(1차 공중합 공정). 이후 100℃까지 2차 승온시켜 "1차 공중합 공정"과 마찬가지로 4시간 반응시켰다(2차 공중합 공정). 한편 100℃ 승온시부터 교반 속도를 230rpm으로 높여 중합전환율 증가에 따른 분산안정성이 저하되는 것을 방지하였다. 중합반응 완료후 반응혼합물을 세척, 탈수, 건조하여 분말상태의 스티렌-아크릴로니트릴 공중합체를 수득하고 물성을 평가하여 그 결과를 하기 표 1에 나타내었다.13 parts of acrylonitrile and 87 parts of styrene were charged into a stainless high pressure reactor equipped with a baffle plate, a stirring device, and a heating jacket having a volume of 300L. 0.47 parts of Calcium Phosphate Tribasic (PCT) was used as a dispersant, and 0.30 parts of benzoyl peroxide having a low half-life and 1,1-bis (t-butylperoxy) 3,3,5-trimethyl as a polymerization initiator were used as a polymerization initiator. 0.10 part of cyclohexane was mixed and used. In addition, 0.3 parts of TDM (t-Dodecyl Mercaptane) was used for molecular weight control, and 123 parts of ion-exchanged water was used as a dispersion medium. The reaction mixtures were stirred constantly at a speed of 200 rpm, and the temperature control of the reaction mixtures was maintained for 4 hours at an initial temperature rise of 80 ° C. during the polymerization reaction (primary copolymerization process). Thereafter, the mixture was heated up to 100 ° C. for 2 hours and reacted for 4 hours in the same manner as in the “first copolymerization step” (secondary copolymerization step). On the other hand, since the stirring speed was increased to 230 rpm from 100 ° C., the dispersion stability was prevented from decreasing due to the increase in the polymerization conversion rate. After the completion of the polymerization reaction, the reaction mixture was washed, dehydrated and dried to obtain a styrene-acrylonitrile copolymer in powder form and evaluated for physical properties. The results are shown in Table 1 below.

실시예 2Example 2

아크릴로니트릴 11부, 스티렌 89부를 투입한 것을 제외하고는 실시예 1과 동일한 방법으로 실시하여 스티렌-아크릴로니트릴 공중합체를 수득하고 물성을 평가하여 그 결과를 하기 표 1에 함께 나타내었다.Except that 11 parts of acrylonitrile and 89 parts of styrene were added, the same procedure as in Example 1 was carried out to obtain a styrene-acrylonitrile copolymer, and the physical properties thereof were shown in Table 1 below.

실시예 3Example 3

분자량 조절제의 함량을 0.3부에서 0.15부로 변경한 것을 제외하고는 실시예 1과 동일한 방법으로 실시하여 스티렌-아크릴로니트릴 공중합체를 수득하고 물성을 평가하여 그 결과를 하기 표 1에 함께 나타내었다.A styrene-acrylonitrile copolymer was obtained in the same manner as in Example 1 except that the content of the molecular weight modifier was changed from 0.3 part to 0.15 part, and the results are shown together in Table 1 below.

비교예 1Comparative Example 1

중합개시제로 벤조일 퍼옥사이드만 0.3부 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 실시하여 스티렌-아크릴로니트릴 공중합체를 수득하고 물성을 평가하여 그 결과를 하기 표 1에 함께 나타내었다.Except that 0.3 parts of benzoyl peroxide was used as the polymerization initiator, the polymerization was carried out in the same manner as in Example 1 to obtain a styrene-acrylonitrile copolymer, and the physical properties thereof were shown in Table 1 below.

비교예 2Comparative Example 2

중합개시제로 1,1-비스(t-부틸퍼옥시)3,3,5-트리메틸-시클로헥산만 0.3부 사용한 것을 제외하고는 실시예 1과 동일한 방법으로 실시하여 스티렌-아크릴로니트릴 공중합체를 수득하고 물성을 평가하여 그 결과를 하기 표 1에 함께 나타내었다.A styrene-acrylonitrile copolymer was prepared in the same manner as in Example 1 except that only 0.3 part of 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane was used as a polymerization initiator. Obtained and evaluated the physical properties are shown in Table 1 together.

구분division 중합물 물성Polymer Properties 건조물 물성Building properties 계의 안정성System stability 잔류SMResidual SM 잔류ANResidual AN 잔류모노머총량Total amount of residual monomer 점도(ηsp/c)Viscosity (ηsp / c) MwMw MnMn 분자량분포Molecular weight distribution 용융지수Melt index 실시예1Example 1 1.01.0 00 1.11.1 0.490.49 135K135 K 73K73 K 1.831.83 14.014.0 안정stability 실시예2Example 2 0.50.5 00 0.60.6 0.600.60 184K184 K 93K93 K 1.981.98 16.016.0 안정stability 실시예3Example 3 0.80.8 00 0.90.9 0.650.65 194K194K 101K101 K 1.921.92 12.012.0 안정stability 비교예1Comparative Example 1 14.014.0 0.30.3 14.514.5 0.420.42 130K130 K 57K57 K 2.262.26 14.514.5 불안unrest 비교예2Comparative Example 2 -- -- -- -- -- -- -- -- 중합실패Polymerization failure

[물성 측정 방법][Measurement Method]

1) 잔류 SM(스티렌 단량체량), 잔류 AN(아크릴로니트릴량), 잔류모노머총량 :1) residual SM (styrene monomer amount), residual AN (acrylonitrile amount), residual monomer total amount:

가스 크로마토그래피(wt %)에 의해 측정하였다.It was measured by gas chromatography (wt%).

2) 점도 : DMF에 용해시켜 25℃에서 우벨로데 점도계로 측정하였다.2) Viscosity: It was dissolved in DMF and measured by Ubelode viscometer at 25 ° C.

3) 분자량(Mw, Mn) 및 분자량 분포 : G,P,C의 용출곡선으로부터 표준 폴리스티렌 중합체를 기준으로 산출하였다.3) Molecular weight (Mw, Mn) and molecular weight distribution: From the elution curve of G, P, C was calculated based on the standard polystyrene polymer.

4) 용융지수 : ASTM D-1238(g/10분)에 따라 측정하였다.4) Melt index: measured according to ASTM D-1238 (g / 10 min).

상기 표 1의 결과를 통해서 확인되는 바와 같이, 본 발명방법에 따라 반감기가 상이한 2종 이상의 개시제를 혼합 사용하면 잔류단량체의 함량이 1중량% 미만으로 극소화되면서 공중합체 제조공정이 환경 친화적이 됨과 동시에 불포화 니트릴화합물 함량이 낮아져 통상의 불포화 니트릴화합물 공중합체의 투명성, 우수한 열안정성 및 기계적 성질과 더불어 일반 스티렌계 수지와의 혼합 가공시 가공성 향상에 기여함은 물론 ABS 알로이에 상용화제로의 이용을 기대할 수 있는 효과를 수득할 수 있다.As can be seen from the results in Table 1, when two or more kinds of initiators having different half-lives are mixed according to the present invention, the amount of residual monomer is minimized to less than 1% by weight, and the copolymer manufacturing process becomes environmentally friendly. As the content of the unsaturated nitrile compound is lowered, it can be expected to be used as a compatibilizer for ABS alloys as well as to improve the workability during mixing and processing with general styrene resins, as well as transparency, excellent thermal stability and mechanical properties of ordinary unsaturated nitrile compound copolymers. Effect can be obtained.

Claims (4)

불포화 니트릴 화합물과 방향족 비닐화합물로 이루어진 공중합체를 수중현탁법에 의해 제조함에 있어서, 중합개시제로 10시간 반감기가 80℃ 이하인 개시제와 10시간 반감기가 90℃ 이상인 2종 이상의 개시제를 혼합한 것을 전체 사용 단량체 100중량부에 대하여 0.01 내지 0.8 중량부 사용하는 것을 특징으로 하는 열가소성 니트릴계 공중합체의 제조방법.In preparing a copolymer of an unsaturated nitrile compound and an aromatic vinyl compound by the water suspension method, a mixture of an initiator having a half-life of 80 hours or less and a 10-hour half-life of two or more initiators having a 10-hour half-life of 90 ° C or more is used as a polymerization initiator. A method for producing a thermoplastic nitrile copolymer, characterized by using 0.01 to 0.8 parts by weight based on 100 parts by weight of monomer. 제 1항에 있어서, 상기 10시간 반감기가 80℃ 이하인 개시제로 벤조일퍼옥사이드 또는 디-t-부틸퍼옥사이드를 사용하고, 10시간 반감기가 90℃ 이상인 개시제로 1,1-비스(t-부틸퍼옥시)3,3,5-트리메틸-시클로헥산 또는 1,1-비스(t-부틸퍼옥시)시클로헥산을 사용하는 것을 특징으로 하는 열가소성 니트릴계 공중합체의 제조방법.The benzoyl peroxide or di-t-butyl peroxide is used as an initiator having a half-life of 10 hours or less at 80 ° C., and 1,1-bis (t-butylper) as an initiator having a half-life of 90 hours or more. A method for producing a thermoplastic nitrile copolymer, characterized by using oxy) 3,3,5-trimethyl-cyclohexane or 1,1-bis (t-butylperoxy) cyclohexane. 제 1항에 있어서, 분자량 조절제로 t-도데실 머캡탄(TDM)을 전체 사용 단량체 100중량부에 대하여 0.10-0.30중량부 사용하는 것을 특징으로 하는 열가소성 니트릴계 공중합체의 제조방법.The method for producing a thermoplastic nitrile copolymer according to claim 1, wherein t-dodecyl mercaptan (TDM) is used in an amount of 0.10-0.30 parts by weight based on 100 parts by weight of the total monomers. 제 1항의 방법에 의해 수득된 공중합체 중의 불포화 니트릴화합물 단량체의 함유율이 10-20 중량%이고, 방향족 비닐화합물 단량체의 함유율이 80-90 중량%인 것을 특징으로 하는 열가소성 니트릴계 공중합체.The thermoplastic nitrile copolymer according to claim 1, wherein the content of the unsaturated nitrile compound monomer in the copolymer obtained is 10-20% by weight and the content of the aromatic vinyl compound monomer is 80-90% by weight.
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KR100582657B1 (en) * 1999-12-16 2006-05-23 제일모직주식회사 Method for preparing thermoplastic styrene/acrylonitrile copolymer
WO2017164507A1 (en) * 2016-03-22 2017-09-28 주식회사 엘지화학 Method for preparing aromatic vinyl-unsaturated nitrile-based copolymer and aromatic vinyl-unsaturated nitrile-based copolymer prepared thereby

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JPS5950685B2 (en) * 1982-03-12 1984-12-10 東レ株式会社 Continuous polymerization method for thermoplastic resin
US5684090A (en) * 1995-05-15 1997-11-04 Image Polymers Company Bimodal, crosslinked toner resin and process for making same
KR100239888B1 (en) * 1996-12-20 2000-01-15 유현식 Process for preparation of acryllo-butadien-alpha methylstylene resin

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100582657B1 (en) * 1999-12-16 2006-05-23 제일모직주식회사 Method for preparing thermoplastic styrene/acrylonitrile copolymer
WO2017164507A1 (en) * 2016-03-22 2017-09-28 주식회사 엘지화학 Method for preparing aromatic vinyl-unsaturated nitrile-based copolymer and aromatic vinyl-unsaturated nitrile-based copolymer prepared thereby
US10519262B2 (en) 2016-03-22 2019-12-31 Lg Chem, Ltd. Method of preparing aromatic vinyl-unsaturated nitrile-based copolymer and aromatic vinyl-unsaturated nitrile-based copolymer prepared using the same

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