WO2021031271A1 - 一种改性ptfe抗滴落剂及其制备方法 - Google Patents

一种改性ptfe抗滴落剂及其制备方法 Download PDF

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WO2021031271A1
WO2021031271A1 PCT/CN2019/106839 CN2019106839W WO2021031271A1 WO 2021031271 A1 WO2021031271 A1 WO 2021031271A1 CN 2019106839 W CN2019106839 W CN 2019106839W WO 2021031271 A1 WO2021031271 A1 WO 2021031271A1
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lubricant
dripping agent
modified ptfe
ptfe
parts
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PCT/CN2019/106839
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French (fr)
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郑晓平
于海阔
于天诗
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南京天诗新材料科技有限公司
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/101—Esters; Ether-esters of monocarboxylic acids
    • C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/20—Carboxylic acid amides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/003—Additives being defined by their diameter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Definitions

  • the invention relates to a preparation method, in particular to a modified PTFE anti-dripping agent and a preparation method thereof, and belongs to the technical field of engineering plastic flame retardant materials.
  • Polytetrafluoroethylene with a molecular weight of about 4 million to 5 million is mainly used as an anti-dripping agent in the field of engineering plastics.
  • Polytetrafluoroethylene resin is added to the formulation of thermoplastic engineering plastics, and under certain conditions, it is effectively dispersed into a fibrous network structure, which has an anti-dripping effect and helps thermoplastic materials reach higher flame retardant standards.
  • Anti-dripping agent is mainly used in plastic materials that require flame retardant to reach V0 level, which can prevent melting and dripping and improve flame retardant performance. When reducing the amount of flame retardant, it can also meet the requirements of ULV-0, while reducing Cost, enhance product competitiveness.
  • Anti-dripping agents are mainly used in plastics made of PC and PC/ABS, and they are also widely used in PBT, ABS, HIPS and other materials.
  • the plastics of these two materials, PA and PP are mainly crystalline polymers, which are not compatible with PTFE. Anti-dripping agents are prone to swelling in these two materials.
  • PA and PP Pure powder type anti-dripping agents are often used.
  • PTFE used as an anti-dripping agent: pure powder type, emulsion type, and coated type.
  • Emulsion type anti-dripping agent is to disperse polytetrafluoroethylene in water through some dispersants to form a suspended emulsion. Because it contains about 40% water (the rest is PTFE) and PC is easily hydrolyzed, it is very important for equipment and The technical requirements are high. At present, there are few domestic modification factories using emulsion, mainly some Japanese manufacturers.
  • the coated anti-drip agent is mainly used to make PTFE better dispersed in the raw resin, and the outer layer of PTFE is coated with a layer of SAN or PMMA, PS, etc., so that the anti-drip agent can be well dispersed.
  • the coated anti-dripping agent is difficult to use in PA and PP because the outer coating is too poorly compatible with these two materials.
  • the technology of coated anti-dripping agent is mainly controlled by the American GE company.
  • the company’s US patent US5804654 points out that in the PTFE emulsion, styrene and acrylonitrile are emulsion polymerized to obtain an encapsulated PTFE/SAN mixture , Can improve the dispersion.
  • Patent CN109280135A which grafts PTFE and active polar molecule GMA to improve its wettability.
  • Patent CN109320674A improves the anti-dripping and flame-retardant properties by co-coating silicone and PTFE.
  • the disadvantage of this type of method is that the production process is relatively complicated and the production cost is relatively high. More importantly, the production process will produce a large amount of fluorine-containing wastewater that is very difficult to treat. Therefore, a new solution is urgently needed to solve this technical problem.
  • the present invention provides a modified PTFE anti-dripping agent and a preparation method thereof to solve the problems in the prior art.
  • the technical solution aims to overcome the problems existing in the current coated and emulsion anti-dripping agents.
  • the technical solution of the present invention is as follows: a modified PTFE anti-dripping agent, 50-90 parts of PTFE resin, and 10-50 parts of lubricant.
  • the lubricant is one or a combination of montan wax, pentaerythritol tetrastearate, and ethylene bisstearic amide.
  • the average particle size of the selected lubricant is less than 10um.
  • montan wax has good thermal stability, no significant weight loss at 260°C, and good transparency when used in PC (polycarbonate). Compared with other types of lubricants, Mondan wax has better release properties.
  • pentaerythritol tetrastearate is an effective lubricant for many polymers; it is commonly used in PC (polycarbonate), thermoplastic polyester (PET, PBT, etc.), PPO, PPS and its thermoplastic engineering plastics.
  • Ethylene bisstearamide English name: N,N'-(Ethane-1,2-diyl)distearamide, referred to as EBS, is widely used in the processing of ABS and AS resins, which can reduce the melting Friction between resin molecules.
  • Mondan wax, pentaerythritol tetrastearate, and ethylene bisstearic acid amide all have good compatibility with engineering plastics.
  • Polytetrafluoroethylene modified with lubricants also has good compatibility with engineering plastics. Greatly improve the dispersibility of the anti-dripping agent in the plastic.
  • a method for preparing a modified PTFE anti-dripping agent comprising the following steps:
  • Step 1 Weigh 50-90 parts of PTFE resin and 10-50 parts of lubricant and mix evenly;
  • Step 2 Transfer the above-mentioned mixture to an oven, bake at 85-160°C for 1 hour, naturally cool to room temperature and take it out to obtain a modified PTFE anti-dripping agent.
  • the second step if there is more than one type of lubricant, it is prepared by a step-by-step cooling method, first heating at 10-20°C higher than the melting point of the high melting point component, and then It is rapidly cooled to a temperature of 10-20°C higher than the low melting point component, and finally cooled naturally to prepare a modified PTFE anti-dripping agent.
  • the rapid cooling of this step refers to cooling to the required temperature within 5 minutes.
  • the present invention has the following advantages: 1) In this technical solution, the PTFE resin and micron-level lubricant can be mixed very thoroughly. The mixture is heated, the lubricant is melted and adsorbed by the PTFE resin, and cooled After that, the fiber-forming properties of the PTFE resin at room temperature are greatly reduced, so that the PTFE resin is not prone to fiberization during transportation, storage, and mixing, and can be evenly dispersed in engineering plastics; 2) The modified PTFE of the present invention The anti-dripping agent and its preparation method use the lubricants commonly used in the engineering plastics industry, and use the micronization method to fully mix with PTFE resin, and make it adsorb in PTFE through heating and stage cooling, which avoids PTFE fibrillation at room temperature , So that PTFE is easily dispersed in engineering plastics. The whole production process has no sewage discharge, and the preparation process adopts physical methods to prepare. It is easy to operate, environmentally friendly and pollution-free. It
  • Example 1 A method for preparing a modified PTFE anti-dripping agent, the specific steps are as follows:
  • Step 1 Weigh 85g of PTFE resin, the manufacturer is Shandong Dongyue, the model is DF202; Weigh 15g of pentaerythritol tetrastearate PETS, the manufacturer is Lonza, the model is Glycolube P, and it is pulverized by a jet mill The average particle size is less than 10um, and it is fully mixed with PTFE resin.
  • Step 2 Transfer the above mixture to an oven, bake at 85°C for 1 hour, and naturally cool to room temperature to take it out to obtain a modified PTFE anti-dripping agent.
  • Example 2 A method for preparing a modified PTFE anti-dripping agent, the specific steps are as follows:
  • Step 1 Weigh 90g PTFE resin, the manufacturer is Shandong Dongyue, model is DF202; Weigh 10g Mengdan wax, the manufacturer is Clariant, the model is Licowax E, crush it to an average particle size of less than 10um by a jet mill , And fully mixed with PTFE resin.
  • Step 2 Transfer the above mixture to an oven, bake at 100°C for 30 minutes, and naturally cool to room temperature to take it out to obtain a modified PTFE anti-dripping agent.
  • Embodiment 3 A preparation method of modified PTFE anti-dripping agent, the specific steps are as follows:
  • Step 1 Weigh 80g PTFE resin, the manufacturer is Shandong Dongyue, model is DF202; Weigh 20g ethylene bisstearamide, the manufacturer is Lonza, the model is ACRAWAXC Atomized, the average particle size of the product is about 6um , And fully mixed with PTFE resin.
  • Step 2 Transfer the above mixture to an oven, bake at 160°C for 1 hour, cool to room temperature and take it out to obtain a modified PTFE anti-dripping agent.
  • Embodiment 4 A preparation method of modified PTFE anti-dripping agent, the specific steps are as follows:
  • Step 1 Weigh 80g PTFE resin, the manufacturer is Shandong Dongyue, model is DF202; Weigh 20g ethylene bisstearamide, the manufacturer is Lonza, the model is ACRAWAXC Atomized, the average particle size of the product is about 6um ; Weigh 10g of Montan wax, the manufacturer is Clariant, the model is Licowax E, it is pulverized to an average particle size of less than 10um by a jet mill, and it is fully mixed with PTFE resin.
  • Step 2 Transfer the above mixture to an oven, quickly (within 5 minutes) cool to 100°C for 30 minutes after baking at 160°C for 30 minutes, and take it out after natural cooling to room temperature to obtain a modified PTFE anti-dripping agent.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
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Abstract

本发明涉及一种改性PTFE抗滴落剂，所述抗滴落剂由如下重量份的组分组成：PTFE树脂50-90份，润滑剂10-50份，所述润滑剂为蒙丹蜡、季戊四醇四硬脂酸酯、乙撑双硬脂酰胺中的一种或者多种组分的组合；该技术方案中PTFE树脂和微米级别的润滑剂，可以进行非常充分的混合，该混合物经加热，润滑剂熔化并被PTFE树脂所吸附，冷却后大大降低了PTFE树脂在常温下的成纤性，使聚四氟乙烯树脂在运输，存储，混合过程中不易发生纤维化，可以均匀地分散于工程塑料中。

Description

一种改性PTFE抗滴落剂及其制备方法 技术领域
本发明涉及一种制备方法，具体涉及一种改性PTFE抗滴落剂及其制备方法，属于工程塑料阻燃材料技术领域。
背景技术
分子量在400万—500万左右的聚四氟乙烯在工程塑料领域主要应用于防滴落剂。聚四氟乙烯树脂被添加到热塑性工程塑料的配方中，在一定条件下有效分散成纤维化的网状结构，起到抗滴落作用，帮助热塑性材料达到更高的阻燃标准。抗滴落剂主要使用在需要阻燃剂别达到V0级的塑料材料中，能防止熔化滴落并提高阻燃性能，在减少阻燃剂的用量时同样能达到ULV-0的要求，同时降低成本，增强产品竞争力。抗滴落剂主要应用于PC、PC/ABS制备的塑料中，在PBT、ABS、HIPS等材料里面亦有广泛的应用。PA、PP这两种材料的塑料主要为结晶型的聚合物，与聚四氟乙烯的相容性不好，防滴落剂在这两种材料中容易出现发胀的现象，在PA、PP中常使用纯粉型的防滴落剂。作为防滴落剂使用的聚四氟乙烯主要有三种型态：纯粉型、乳液型、包覆型。
纯粉型的聚四氟乙烯树脂在实际使用中主要存在两个问题：一是聚四氟乙烯树脂在运输，存储，混合过程中易发生纤维化，使之在工程塑料中无法良好分散；二是聚四氟乙烯树脂表面能很低(18dyn)，难以被熔融状态的工程塑料所润湿。上述这些问题的存在使得直接添 加聚四氟乙烯树脂的工程塑料制品表面往往会出现条纹和麻点等缺陷，或者需要更多的添加量才能满足抗滴落的需求。为了解决上述问题，乳液型和包覆型产品生产技术开始出现。
乳液型的防滴落剂是将聚四氟乙烯通过一些分散剂的作用分散在水中形成悬浮的乳液.由于里面含有约40％的水(其余为PTFE)而PC又容易水解，所以对设备与技术的要求较高。目前国内改性厂使用乳液的厂家较少，主要是一些日本的厂家在使用。
包覆型的防滴落剂主要是为了使PTFE能更好的分散在原料树脂中而在PTFE的外层包覆了一层SAN或者PMMA、PS等,使防滴落剂能很好的分散在PC、ABS、HIPS等中.但包覆的防滴落剂在PA、PP中难以使用，因为外层的包覆与这两种材料相容性太差。包覆型的抗滴落剂的技术主要掌握在美国GE公司手上，该公司的美国专利US5804654指出，在PTFE乳液中，对苯乙烯和丙烯腈进行乳液聚合，得到胶囊化的PTFE/SAN混合物，能提高分散性。国内也有很多专利技术是基于该方法的改进，如CN109280135A，通过PTFE与活性极性分子GMA进行接枝，提高其润湿性。专利CN109320674A通过将有机硅和PTFE进行共包覆，提高抗滴落和阻燃性能。该类方法缺陷是生产过程比较复杂，生产成本也比较高，更重要的是，生产过程会产生大量的，非常难以处理的含氟废水。因此，迫切的需要一种新的方案解决该技术问题。
发明内容
本发明正是针对现有技术中存在的问题，提供一种改性PTFE抗滴落剂及其制备方法，该技术方案旨在克服目前包覆型和乳液型抗滴落剂存在的问题。
为了实现上述目的，本发明的技术方案如下，一种改性PTFE抗滴落剂，PTFE树脂50-90份，润滑剂10-50份。
作为本发明的一种改进，所述润滑剂为蒙丹蜡、季戊四醇四硬脂酸酯、乙撑双硬脂酰胺中的一种或者多种组分的组合。
作为本发明的一种改进，所选用的润滑剂的平均粒径小于10um。
该技术方案中，蒙丹蜡有良好的热稳定性，在260℃时没有明显的重量损失，在用于PC(聚碳酸酯)时有良好的透明性，和其他类型的润滑剂相比，蒙丹蜡有更好的脱模性。
季戊四醇四硬脂酸酯，热解重量分析结果显示，350℃时，它仍没有明显的重量损失。在挤出和塑模加工过程中，季戊四醇四硬脂酸酯，对很多聚合物来说都是一个有效的润滑剂；常用于PC(聚碳酸酯)、热塑性聚酯(PET，PBT等)、PPO、PPS及它的热塑性工程塑料。
乙撑双硬脂酰胺，英文名称:N,N'-(Ethane-1,2-diyl)distearamide，简称EBS，在ABS和AS树脂的加工中被大量的使用到，可以很好的降低熔融后树脂分子之间的摩擦。
蒙丹蜡，季戊四醇四硬脂酸酯，乙撑双硬脂酰胺均和工程塑料有良好的相容性，用润滑剂改性的聚四氟乙烯，亦和工程塑料有良好的相容性，大大提高了抗滴落剂在塑料中的分散性。
一种改性PTFE抗滴落剂的制备方法，所述方法包括以下步骤：
步骤一：称取PTFE树脂50-90份和润滑剂10-50份均匀混合；
以高于润滑剂熔点温度10-20℃的温度进行加热30min-120min，
步骤二：将上述混合物转移到烘箱中，85-160℃烘烤1小时，自然冷却到常温取出，得到改性PTFE抗滴落剂。
作为本发明的一种改进，所述步骤二中，如果是多于一种的润滑剂，则采用阶段降温的方法制备，先以高于高熔点组分熔点的10-20℃进行加热，然后快速冷却到高于低熔点组分的10-20℃的温度，最后自然冷却后制得改性PTFE抗滴落剂。该步骤的快速冷却是指在5min内冷却到所需要温度。
相对于现有技术，本发明具有如下优点，1)该技术方案中PTFE树脂和微米级别的润滑剂，可以进行非常充分的混合，该混合物经加热，润滑剂熔化并被PTFE树脂所吸附，冷却后大大降低了PTFE树脂在常温下的成纤性，使聚四氟乙烯树脂在运输，存储，混合过程中不易发生纤维化，可以均匀地分散于工程塑料中；2)本发明的改性PTFE抗滴落剂及其制备方法，选用工程塑料行业常用的润滑剂，采用微粉化的方式和PTFE树脂充分混合，经加热及阶段降温的方式使其吸附在PTFE中，避免了PTFE常温成纤化，使PTFE容易分散在工程塑料中。整个生产过程无污水排放，且制备过程采用物理方法进行制备，操作简便、环保、无污染，是传统包覆型抗滴落剂的环保型替代产品。
具体实施方式
为了加深对本发明的认识和理解，下面结合具体实施例进一步介绍该发明。
实施例1：一种改性PTFE抗滴落剂的制备方法，具体步骤如下：
步骤一，称取85g PTFE树脂，生产厂家为山东东岳，型号为DF202；称取季戊四醇四硬脂酸酯PETS 15g，生产厂家为美国龙沙，型号为Glycolube P，通过气流式粉碎机粉碎到平均粒径10um以下，并和PTFE树脂充分混合。
步骤二，将上述混合物转移到烘箱中，85℃烘烤1小时，自然冷却到常温取出，得到改性PTFE抗滴落剂。
实施例2：一种改性PTFE抗滴落剂的制备方法，具体步骤如下：
步骤一，称取90g PTFE树脂，生产厂家为山东东岳，型号为DF202；称取蒙旦蜡10g，生产厂家为科莱恩，型号为Licowax E，通过气流式粉碎机粉碎到平均粒径10um以下，并和PTFE树脂充分混合。
步骤二，将上述混合物转移到烘箱中，100℃烘烤30min，自然冷却到常温取出，得到改性PTFE抗滴落剂。
实施例3：一种改性PTFE抗滴落剂的制备方法，具体步骤如下：
步骤一，称取80g PTFE树脂，生产厂家为山东东岳，型号为DF202；称取乙撑双硬脂酰胺20g，生产厂家为美国龙沙，型号为ACRAWAX C Atomized，该产品平均粒径约6um，和PTFE树脂充分混合。
步骤二，将上述混合物转移到烘箱中，160℃烘烤1小时，冷却到常温取出，得到改性PTFE抗滴落剂。
实施例4：一种改性PTFE抗滴落剂的制备方法，具体步骤如下：
步骤一，称取80g PTFE树脂，生产厂家为山东东岳，型号为DF202；称取乙撑双硬脂酰胺20g，生产厂家为美国龙沙，型号为ACRAWAX C Atomized，该产品平均粒径约6um；称取蒙旦蜡10g，生产厂家为科莱恩，型号为Licowax E，通过气流式粉碎机粉碎到平均粒径10um以下，和PTFE树脂充分混合。
步骤二，将上述混合物转移到烘箱中，160℃烘烤30min后快速(5min内)冷却到100℃烘烤30min，自然冷却到常温后取出，得到改性PTFE抗滴落剂。
把四个实施例以0.4％比例加入PC/ABS/MBS/TPP配比为56：24：10：10的阻燃体系，经测试，四个样品均可以达到UL94 V0要求，未加改性PTFE的无法通过UL94 V0测试。
需要说明的是上述实施例仅仅是本发明的较佳实施例，并非用来限定本发明的保护范围，在上述技术方案的基础上做出的等同替换或者替代均属于本发明的保护范围。

Claims (5)

  1. 一种改性PTFE抗滴落剂，其特征在于，所述抗滴落剂由如下重量份的组分组成：PTFE树脂50-90份，润滑剂10-50份。
  2. 根据权利要求1所述的改性PTFE抗滴落剂，其特征在于，所述润滑剂为蒙丹蜡、季戊四醇四硬脂酸酯、乙撑双硬脂酰胺中的一种或者多种组分的组合。
  3. 根据权利要求2所述的改性PTFE抗滴落剂，其特征在于，所述润滑剂的平均粒径小于10um。
  4. 一种改性PTFE抗滴落剂的制备方法，其特征在于，所述方法包括以下步骤：
    步骤一：称取PTFE树脂50-90份和润滑剂10-50份均匀混合；以高于润滑剂熔点温度10-20℃的温度进行加热30min-120min，
    步骤二：将上述混合物转移到烘箱中，85-160℃烘烤1小时，自然冷却到常温取出，得到改性PTFE抗滴落剂。
  5. 根据权利要求4所述的改性PTFE抗滴落剂的制备方法，其特征在于，所述步骤二中，如果是多于一种的润滑剂，则采用阶段降温的方法制备，先以高于高熔点组分熔点的10-20℃进行加热，然后快速冷却到高于低熔点组分的10-20℃的温度，最后自然冷却后制得改性PTFE抗滴落剂。
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