丙烯酸酯聚合物加脂剂乳液性质研究

研究了丙烯酸-甲基丙烯酸十六酯聚合物皮革加脂剂的乳液性质。丙烯酸酯聚合物加脂剂具有良好的表面活性,是一种高分子表面活性剂;聚合物的相对分子质量增加或加脂液的pH降低,乳液粒度变大;随聚合物中丙烯酸组分含量增加,乳液稳定性提高。结果表明:聚合物加脂剂的Mw<8000、pH=6 0～8 0,加脂工艺的pH=6 0～7 0较好。     

国内信息

我国对丙烯酸酯反倾销期中复审调查；天津建丙烯酸乳液装置；上海华谊丙烯酸装置投产；沈化13万吨丙烯酸及酯项目签约；聚乙烯纤维粘合涂层用水乳型聚丙烯酸酯微乳液的合成；丙烯酸高级酯共聚物组成与其无皂乳液稳定性研究     

聚丙烯酸酯无皂乳液的合成及表征

以甲基丙烯酸丁酯、丙烯酸为原料合成的齐聚物为乳化剂合成了聚丙烯酸酯无皂乳液.研究了单体配比、链转移剂、pH值对齐聚物的影响,以及反应温度、单体配比、齐聚物用量、引发剂对聚丙烯酸酯无皂乳液性能的影响.并对聚丙烯酸酯无皂乳液进行了红外光谱和透射电镜的表征.     

无皂乳液聚合制备AANa-VAc-TFEMA纳米含氟乳液

以丙烯酸钠(AANa)、乙酸乙烯酯(VAc)和甲基丙烯酸三氟乙酯(TFEMA)为单体进行无皂乳液聚合,合成了P(AANa-VAc-TFEMA)纳米含氟乳液,考察了反应温度、引发剂用量、单体配比对聚合的影响,并着重对聚合物乳液的粒径进行了研究。结果表明:该聚合单体的转化率可达到97.00%以上,聚合得到的无皂乳液稳定性好、粒径分布均匀。通过控制单体配比中AANa的含量及VAc与TFEMA的比例,可以得到纳米含氟乳液。     

阳离子型含氟聚丙烯酸酯无皂乳液的合成及性能

以可逆加成断裂链转移(RAFT)聚合合成的聚甲基丙烯酸-N,N-二甲氨基乙酯-b-聚丙烯酸六氟丁酯(PDMAEMA-b-PHFBA)为稳定剂,通过无皂乳液聚合技术合成了阳离子型含氟聚丙烯酸酯无皂乳液。用FTIR、1HNMR、TEM、DLS对乳胶粒子和聚合物的结构进行了表征。结果表明,当PDMAEMA-b-PHFBA的用量为总加料质量的2.4%时,乳液的稳定性好,Zeta电位达+57.8 m V,转化率达97.6%,乳胶粒具有明显的核壳结构,粒径分布指数为0.058。将阳离子型含氟聚丙烯酸酯无皂乳液用于皮革涂饰后,随着丙烯酸六氟丁酯用量的增加,涂饰后的皮革对水和二碘甲烷的接触角逐渐增加,当丙烯酸六氟丁酯用量为总单体质量的10%时,涂饰后的皮革对水的接触角为125°,对二碘甲烷的接触角为81.5°。     

阳离子型含氟聚丙烯酸酯无皂乳液的合成 及其性能研究

以可逆加成-断裂链转移(RAFT)聚合合成的聚甲基丙烯酸N,N-二甲氨基乙酯-b-丙烯酸六氟丁酯（PDMAEMA-b-PHFBA）为稳定剂,通过无皂乳液聚合技术合成了阳离子型含氟聚丙烯酸酯无皂乳液。采用红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)、透射电子显微镜(TEM)、动态光散射(DLS)对乳胶粒子和聚合物的结构进行了表征。结果表明,当PDMAEMA-b-PHFBA用量为2.4%时,乳液的稳定性好,转化率高,乳胶粒具有明显的核壳结构,且粒径分布窄。将阳离子型含氟聚丙烯酸酯无皂乳液用于皮革涂饰后,皮革表面的防水防油性得到明显提高,随着丙烯酸六氟丁酯用量的增加,涂饰后的皮革对水和二碘甲烷的接触角逐渐增加,当丙烯酸六氟丁酯用量为10%时,涂饰后的皮革对水的接触角为125?,对二碘甲烷的接触角为81.5?。     

改性苯乙烯-丙烯酸酯防水防油剂的研究

以甲基丙烯酸十二氟庚酯(FM)、丙烯酸丁酯(BA)、苯乙烯(St)、甲基丙烯酰氧乙基三甲基氯化铵(DAC)、丙烯酸十八酯(ODA)为原料,采用无皂乳液聚合,制得了阳离子含氟丙烯酸酯多元共聚物乳液,并对聚合物的结构、组成进行了表征,研究了引发剂、FM的用量对乳液耐水性和稳定性的影响。单独使用含氟乳液对纤维类织物进行表面涂敷,水和油滴在织物上所成的接触角最大可分别达到135°和87°,同时织物的抗张强度、耐折度、平滑度分别提高13.45%、15.38%和60.52%。     

环氧共聚物乳液性能的研究

本文研究了以甲基丙烯酸环氧丙酯作为活性单体，采用种子乳液聚合制备四元体系的共聚物乳液，对其稳定性，流变性等性能进行了表征测试，考察了甲基丙烯酸环氧丙酯及其含量对乳液性能的影响．     

纳米SiO2胶体改性零VOC叔氟乳液的制备及其性能的研究

以纳米SiO2胶体、叔碳酸乙烯酯、(甲基)丙烯酸六氟丁酯、(甲基)丙烯酸及其酯等为原料制备了新型纳米材料改性叔氟共聚物乳液,研究了反应温度、有机氟单体用量、乳化剂配比等对乳液聚合的影响,并对制备的乳液进行了红外、紫外、机械稳定性等的表征.     

高稳定性丙烯酸酯共聚物无皂乳液的合成及表征

以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)为主单体,过硫酸钾(KPS)为引发剂,丙烯酸(AA)和丙烯酸羟乙酯(HEA)作为亲水单体,制备丙烯酸酯共聚物无皂乳液。结果表明,当丙烯酸羟乙酯(HEA)用量和丙烯酸(AA)用量分别为单体总质量的16%和4%时,乳液粒径为57 nm,乳液稳定性好,胶膜的拉伸强度达到9.56 MPa。     

有机硅-丙烯酸酯共聚物乳液的制备及在调湿涂料中的应用

以3-甲基丙烯酰氧丙基三甲氧基硅烷(MPTS)为功能改性单体,丙烯酸酯及少量的丙烯酸为主要共聚单体,采用离子型/非离子型复合乳化剂,过硫酸钾(KPS)为引发剂,制备了有机硅改性的丙烯酸酯共聚物乳液(SAE)。考察了MPTS用量、甲基丙烯酸-β-羟丙酯(HPMA)用量、引发剂用量及聚合温度对乳液稳定性的影响。采用IR、TG对SAE进行了表征。共聚物乳液SAE为成膜物,硅藻土、膨润土等为颜填料,制备了有机硅改性丙烯酸酯共聚物调湿涂料(SAE-C)。在测定共聚物乳液膜、SAE-C涂料基本性能的基础上,进一步测定了涂料SAE-C调湿功能。结果表明,MPTS能提高SAE乳液膜的附着力和涂料的耐水性;SAE乳液与SAE-C涂料均能达到国家内墙涂料和建筑涂料相关标准。同时,具有较好的增/降湿性能,可用作具有调湿功能的内墙涂料。     

Study on copolymer emulsion containing an epoxy group

Methyl methacrylate, butyl acrylate, acrylic acid, and various amounts of glycidyl methacrylate (GMA) were copolymerized by a semicontinuous seeded emulsion copolymerization to be a four-component copolymer emulsion; the copolymers were characterized using swelling capacity, transmission electron microscopy (TEM), etc. The effect of glycidyl methacrylate and its content on the properties of emulsion and copolymer films was studied. The self-crosslinking reaction of the copolymer was investigated by FTIR and DSC. It was found that the swelling capacity of the crosslinked copolymer films decreased with increase of the glycidyl methacrylate content, the morphology showed a core–shell structure, and the copolymer emulsion possessed a self-crosslinking property. © 1995 John Wiley & Sons, Inc.     

Silicylacrylate copolymer core–shell emulsion for humidity coatings

Using silicylacrylate (SPMA: 3-(trimethoxysilyl)propyl methacrylate) and acrylic acid as functional monomers, silicylacrylate copolymer core–shell emulsion (SiA-CSE) was prepared by emulsion polymerization. The relationships between stability of SiA-CSE and contents of SPMA, emulsifier, initiator and copolymerization temperature were investigated. Moreover, the structure of SiA-CSE was characterized by FTIR, TEM and TGA techniques. The SiA-CSE was applied to prepare the silicylacrylate copolymer humidity coatings (SiA-CSE-C) by compositing with pigments and porous fillers. Based on measuring the basic performance of copolymer emulsion film and SiA-CSE coatings, the humidifying function of SiA-CSE coatings was investigated. In conclusion, SPMA could improve the adhesion of SiA-CSE film and water resistance of the coatings. The obtained coatings showed excellent humidity-sensitivity and humidity retention, which could be used as the interior walls coatings in the building.     

纯丙乳液研究进展

纯丙乳液是甲基丙烯酸酯类、丙烯酸酯类、丙烯酸三元共聚乳液的简称，是一种重要的中间产品或原料。常规的乳液聚合制备的纯丙乳液，性能较差，不能满足纯丙乳液的实际应用要求。综述了纯丙乳液在微量功能单体的引入、乳化体系、引发体系及聚合工艺方面的研究进展，并指出获得性能优良纯丙乳液的途径。     

有机硅/丙烯酸酯共聚乳液的耐热性能

以八甲基环四硅氧烷、乙烯基三甲氧基硅烷、丙烯酸丁酯、甲基丙烯酸甲酯、丙烯酸等为原料，采用种子乳液聚合法合成了高有机硅含量的有机硅／丙烯酸酯接枝共聚物。利用红外光谱表征了有机硅丙烯酸酯共聚物的结构，利用热重分析测试了共聚物的热分解温度。结果表明，丙烯酸酯聚合物上成功地引入了有机硅链节，且耐热性能得到很大地提高。     

无皂乳液聚合制备PUA乳液的稳定性研究

采用无皂乳液聚合法制备丙烯酸酯一聚氨酯复合乳液（PUA）。HEMA作为交联剂引入到聚氨酯主链上,利用核壳交联制得复合乳液。研究了不同的合成工艺、丙烯酸酯单体、DMPA及HEMA含量,引发剂种类等对乳液稳定性的影响。研究发现,将丙烯酸酯单体溶胀于水性聚氨酯乳液中再进行聚合可大大提高乳液的稳定性;采用1．0％～12％的AIBN为引发剂、DMPA质量分数为4．5％、HEMA质量分数为4．0％～4．5％、丙烯酸酯单体质量分数为30％时,可制得外观及稳定性良好的PUA复合乳液。     

丙烯酸酯乳液的合成及改性研究

以丙烯酸丁酯(BA)和丙烯酸-2-乙基己酯(2-EHA)为软单体、甲基丙烯酸甲酯(MMA)为硬单体、丙烯酸(AA)为功能单体、甲基丙烯酸羟乙酯(HEMA)为交联单体和十二烷基硫酸钠(SDS)/乳化剂(OP-10)为阴/非离子型复合乳化剂,采用核/壳种子乳液聚合法制备了丙烯酸酯共聚乳液;然后在壳层聚合时寸加入HEMA,并用乙烯基有机硅进行改性,制得硅丙乳液。结果表明:当m(SDS):m(OP-10)=3:2、w(复合乳化剂)=3.4%、w(引发剂)=0.82%、w(HEMA)=3.5%、聚合温度为80℃以及聚合中期加入6.8%乙烯基硅油至壳单体中时,硅丙乳液及其胶膜的稳定性、耐水性和力学性能俱佳。     

叔碳酸乙烯酯改性醋丙乳液的制备与性能研究

采用半连续种子乳液聚合,以丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)、乙酸乙烯酯(VAc)为主单体,丙烯酸(AA)为功能单体,叔碳酸乙烯酯(VeoVa10)为改性单体,合成了核壳型丙烯酸酯乳液。探讨了聚合温度、乳化剂、引发剂及功能单体与乳液性能的关系。通过单因素实验探讨了乳化剂用量、配比,改性单体用量等与乳液性能的关系。FT-IR和DSC测试结果表明,各单体之间发生了自由基共聚反应,乳液粒子为核壳结构。     

Effect of naphthyl curing agent having thermally stable structure on properties of UV-cured pressure sensitive adhesive

Pressure sensitive adhesives (PSAs) with higher thermal stability were synthesized by crosslinking acrylic copolymer with naphthyl curing agent. The acrylic copolymer was synthesized for a base resin of PSAs by solution polymerization of 2-ethylhexyl acrylate, ethyl acrylate, and acrylic acid with N,N′-azobisisobutyronitrile as an initiator. The acrylic copolymer was further modified with glycidyl methacrylate to have the vinyl groups available for UV curing. Thermal stability of acrylic PSAs was improved noticeably with increasing naphthyl curing agent content and UV dose mainly due to the extensive formation of crosslinked structure in the polymer matrix. Although the peel strength decreased with UV curing of acrylic polymer, a proper balance between the thermal stability and the adhesion performance of PSAs was obtained by controlling the UV curing with naphthyl curing agent content and UV dose.     

Preparation of two‐layer film having porous structure by emulsion blend technique

A two‐layer film consisting of a tacky layer (air side) and a porous nontacky layer (release‐paper side) was prepared by casting blend emulsion on a release paper, in which 150‐nm 2‐ethylhexyl acrylate–2‐methoxyethyl acrylate–acrylic acid terpolymer particles having high storage stability and 542‐nm ethyl acrylate–methyl methacrylate copolymer particles having low storage stability were dispersed. Both emulsion particles were produced by emulsifier‐free emulsion copolymerizations. The difference of tackiness between both surfaces increased with increases in the film‐formation time and the concentration of electrolytes in the blend emulsion, and resulted in the two‐layer film. The film had a high water vapor permeability, which is also needed for medical adhesive tape. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2027–2033, 2003