接枝型水性环氧树脂乳液的合成与粘接性能研究

以过氧化苯甲酰为引发剂,丙烯酸为接枝单体,按自由基接枝聚合机理制得稳定的环氧树脂乳液。考查了环氧树脂分子质量、引发剂用量、丙烯酸用量、温度、时间对反应的影响,利用红外光谱对接枝产物的结构进行了表征。通过粘接性能测试,考查了不同固化温度和固化时间对乳液粘接性能的影响。实验结果表明,在环氧树脂上接枝了强亲水性基团-COOH,乳液稳定性较好,粘接力较高。     

环氧树脂改性PUA乳液的合成及性能研究

以异佛尔酮二异氰酸酯（IPDI）、聚醚二元醇（N220）、二羟甲基丙酸（DMPA）、1,4-丁二醇（BDO）和甲基丙烯酸甲酯（MMA）为主要原料合成了脂肪族聚氨酯-丙烯酸酯复合乳液（PUA）,并用环氧树脂对其进行了改性。研究了nNCO／nOH比、DMPA添加量、环氧添加方式及添加量对其性能的影响,结果表明,当nNCO／nOH为1．35-1．4、DMPA为6％～7％时,以环氧和BDO一起加入,环氧添加量在2％～3％时能获得综合性能较好且贮存稳定的聚氨酯丙烯酸酯复合乳液。     

丙烯酸酯类无皂乳液的合成与性能研究

采用半连续种子乳液聚合法,以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为功能性单体,以过硫酸钾(KPS)为引发剂,成功制备了一种高稳定性、高固含量的聚甲基丙烯酸甲酯/丙烯酸丁酯(P(BA/MMA))无皂乳液。讨论了AMPS用量、BA与MMA配比、KPS用量等对乳液聚合过程的影响,并研究了乳液的流变性能。     

胃溶型丙烯酸树脂乳液的制备

采用乳液聚合法,以甲基丙烯酸甲酯(MMA)和甲基丙烯酸二甲氨基乙酯(DM)为单体,制备了可直接用于药物包衣的胃溶型丙烯酸树脂乳液。结果表明,当温度为65℃,单体摩尔比为1∶1,引发剂和乳化剂用量分别为0.6%和0.3%,采用单体连续滴加法时,可制得稳定的乳液,聚合物分子量为14.9万。在180℃以下,产品的失重率基本不随温度而变,而在180℃以上,失重率随温度升高而增加。聚合物膜在缓冲溶液中的失重率随pH的增加而减小,当pH为1.0和2.0时,膜几乎全部溶解,pH为3.0时,膜的失重率为65.0%,在pH为4.0时,失重率迅速降低到32.8%,到pH为7.0时,膜已基本不溶。     

酚醛浆的合成工艺对松香改性树脂性能的影响

研究了酚醛浆合成中烷基酚种类、反应温度、反应时间、酚醛摩尔比及反应体系酸碱性对松香改性酚醛树脂性能的影响,得出了酚醛浆合成的最佳工艺条件。合成的松香改性酚醛树脂软化点165℃、黏度13000mPa·s（25℃）、正庚烷值8．4mL／（2g）,性能优良。     

含萜烯树脂丙烯酸酯乳液型压敏胶的制备与性能研究

以混合丙烯酸酯为共聚单体,萜烯树脂为增黏树脂,过硫酸钾(KPS)为引发剂,十二烷基硫酸钠(SDS)、烷基酚聚氧乙烯醚(OP-10)和十二烷基二苯醚二磺酸钠盐(2A1)为乳化剂,采用预乳化半连续乳液聚合法制备压敏胶(PSA)用丙烯酸酯乳液。研究结果表明:当m(OP-10)∶m(SDS)∶m(2A1)=16.5∶3.6∶7.9、w(KPS)=0.5%、单体滴加时间为3.5 h和反应温度为80～82℃时,含萜烯树脂PSA的综合性能相对最好,其初粘力(19#钢球)和剥离强度(5.8 N/25 mm)优于不含萜烯树脂PSA,但前者的持粘力(22 h)低于后者。     

色粉纸用自交联丙烯酸树脂乳液的合成及性能

根据色粉纸表面固砂的性能要求,以丙烯酸丁酯(BA)、甲基丙烯酸异辛酯(EHMA)为软单体、丙烯酸甲酯(MA)、甲基丙烯酸甲酯(MMA)为硬单体,丙烯酸羟丙酯(HPA)为交联单体,甲基丙烯酸(MAA)、甲基丙烯酸缩水甘油酯(GMA)作为功能单体,采用半连续种子乳液聚合法,制备了具有核壳结构的水性丙烯酸酯树脂乳液(WSAE-G),进一步将其作为色粉纸表面固砂用黏合剂和成膜剂.讨论了GMA用量对乳液粒径、稳定性和黏度等的影响.利用DLS和TEM对乳液乳胶粒子的大小及形貌进行了表征,使用TG、DSC以及万能材料试验机对胶膜的性能进行了测试.对固砂产品表面进行SEM测试.结果表明:GMA用量为1％(以混合单体总质量为基准,下同)时,乳液粒径为142.4 nm,PDI为0.063,乳液分散稳定指数(TSI)为0.162287.TEM显示,乳液具有清晰的核壳结构.胶膜拉伸强度达9.057 MPa.制得的色粉纸层间结合力为244.9 J/m2,所形成的固砂层均匀、磨砂性较好且不易掉砂.     

Study on synthesis of polyurethane‐epoxy composite emulsion

The stable polyurethane‐epoxy composite emulsion with the epoxy‐amine oligomer (DEA‐EP) and the epoxy resin oligomer has been prepared by step‐growth polymerization and controlled crosslinking technique. The emulsion forming transparent films can be cured at room temperature with trimethylolpropane tris (1‐ethyleneimine) propionate (TMPTA‐AZ). The DEA‐EP structure and its reaction with urethane prepolymers were proved by Fourier transform infrared spectra (FTIR). The studies on particle size, the particle size distribution, viscosity, and the films' transmittance (Tr) indicated that both trimethylol propane (TMP) and DEA‐EP contributed to improving the resin blends' compatibility and reducing the viscosity. The epoxy resin content can increase up to 20.0 wt % (based on the total content of the polyurethane and epoxy resin) and the emulsion was still stable. The data from the tensile test experiments showed that with the epoxy content increasing, the tensile strength (σ_b) and Young's modulus were proportionately raised, but the elongation at break (ε_b) decreased. Tensile tests also revealed that introducing TMPTA‐AZ as an outside‐crosslinker can increase the tensile strength. By adding 0.3 wt % of TMPTA‐AZ, the ε_b reduced from 429% to 371% and the σ_b increased from 4.4 to 13.73 MPa; by adding 1.8 wt % of TMPTA‐AZ, ε_b of the film was 67% of ε_b of the film with 0.3 wt % of TMPTA‐AZ, but its σ_b was 24.77 MPa and 180% of σ_b of the film with 0.3 wt % of TMPTA‐AZ. The cured films possessed excellent water and toluene resistance: water uptake (48 h, 3.1%; degree of curing: 70%), toluene uptake (210 h, 8%. degree of curing: 70%). Better properties of the composite emulsion will confer it as a potential application in low volatile industrial coatings. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

单组分水性环氧乳液的合成研究

采用环氧树脂/丙烯酸单体接枝共聚方法对环氧树脂进行化学改性,合成了单组分自乳化环氧乳液。考察了环氧树脂分子量、功能单体和引发剂用量对合成的环氧乳液稳定性、粒子结构、粒径分布的影响。实验结果表明,采用高分子量环氧树脂E-06和E-03配合使用,甲基丙烯酸单体含量44%,过氧化苯甲酰用量为单体总质量的8.4%,合成的环氧乳液具有良好的储存稳定性、黏度适中、粒径小,适于工业涂装。     

改性纳米硅溶胶–丙烯酸树脂复合乳液的制备及性能研究

以丙烯酸及丙烯酸酯类单体为原料,在预聚过程中加入自制的改性纳米硅溶胶,采用溶液聚合法制备了改性纳米硅溶胶–丙烯酸树脂复合乳液,研究了反应时间、m(引发剂)/m(单体)和m(SiO_2)/m(单体)对复合乳液稳定性及其漆膜性能的影响。结果表明,反应时间为4 h、m(引发剂)/m(单体)为3%、m(SiO_2)/m(单体)为5%时,复合乳液的综合性能最优。与市售产品相比,所制备的改性纳米硅溶胶–丙烯酸树脂复合乳液涂膜性能更优,其硬度为4H,附着力0级,冲击强度50 kg·cm,柔韧性2 mm。     

有机硅改性丙烯酸酯微乳液的合成研究

以八甲基环四硅氧烷(D4)、-γ甲基丙烯酰氧基丙基三乙氧基硅烷(KH570)和六甲基二硅氧烷(MM)为原料,在Me4NOH催化和二甲基亚砜(DMSO)促进作用下,通过本体聚合合成了侧链含双键的有机硅大分子,可用红外光谱图测定分子结构。采用微乳液聚合法,将丙烯酸酯单体、有机硅大分子单体进行自由基聚合,制备有机硅改性丙烯酸酯微乳液。利用5因素4水平正交实验优化出最佳工艺参数:乳化剂用量为3%,有机硅大分子的用量为9%,单体配比为0.76,异丙醇用量为1.5%,可获得高稳定性乳液,成膜各项性能提高。     

水溶性双酚A型环氧树脂乳液的制备

采用E-Ⅱ型乳化剂和相反转技术制备水溶性双酚A型环氧树脂乳液,研究了乳化剂的用量、乳化时间、搅拌速率和乳化温度对乳液稳定性的影响.得出了最佳乳化工艺条件:乳化剂质量分数为7.25%～8.0%、乳化温度为60～70 ℃、搅拌速度为700～900 r/min、乳化时间为40～50 min.采用激光粒度衍射分析仪表征了水溶性环氧乳液的粒径为400～500 nm.     

有机/无机复合高吸水树脂的制备及性能

以玉米淀粉、羧甲基淀粉钠和丙烯酸为主要原料,同时加入活性高岭土,采用水溶液共聚法制备了复合高吸水树脂。考察了接枝共聚过程的影响因素,确定了合成树脂的最优工艺条件,合成的树脂吸水倍率为1195.4 g·g^-1,吸盐水(质量分数为0.9%的氯化钠溶液)倍率为90.1 g·g^-1。借助于傅里叶红外(FTIR)、扫描电镜(SEM)及热重-差热分析(TG-DTA)技术对合成树脂进行了性能和结构表征,并考察了样品的热稳定性。结果表明,高吸水树脂在100℃下具有良好的热稳定性,所制备样品具有商业化前景。     

Synthesis and characterization of ABS resin using in situ transferring from emulsion to suspension polymerization

A novel approach based on an emulsion in situ suspension polymerization process for synthesizing poly(acrylonitrile–butadiene–styrene) (ABS) resin is reported. Experimental results show that the reaction system can be transformed from an emulsion state to a suspension polymerization state steadily with the content of polybutadiene (PB) in the range 0–15 wt% in ABS resin. When PB is replaced by poly(styrene‐co‐butadiene) with the content of rubber particles being kept below 20 wt%, the emulsion system can be easily transferred to the suspension polymerization state through a process of latex coagulation in the forward direction, which means that the emulsion solution was dripped slowly into the suspension reaction system in the presence of coagulating agent. The dispersion status of the rubber particles in the ABS resin was studied using transmission electron microscopy, which indicated that the rubber particles were in a dispersed state in a continuous matrix of poly(styrene‐co‐acrylonitrile) when the content of rubber particles was below 20 wt%. The mechanical properties of the ABS resins obtained are as follows: elongation at break, 9.4–45.7%; yield tensile strength, 35.1–42.2 MPa; impact strength, 98.2–116.3 J m^?1. Copyright © 2006 Society of Chemical Industry     

Improvement of thermal properties of pigmented acrylic resin using silica aerogel

In this study, two different types of acrylic resins were synthesized through emulsion polymerization. The first category of acrylic resins contained methyl methacrylate, 2‐ethylhexyl acrylate, and acrylic acid monomers. The second composition had an additional monomer named acrylamide (AAm). The kinetic behavior of polymerization reaction was investigated. The results showed that the presence of the AAm monomer increased the monomer conversion (>90% in the first 10 min) and the rate of polymerization. Furthermore, the latexes were characterized by Dynamic Light Scattering (DLS) Fourier Transform Infrared, and differential scanning calorimeter analysis. To study the effect of silica aerogel as a thermal barrier additive for acrylic resins, samples were mixed with silica aerogel using sodium dodecyl sulfate as a surfactant. In the next step, the above‐mentioned resins were used to make white acrylic‐based paints. The heat transfer measurements revealed that the thermal insulation properties were not affected by the composition of the resin. On the other hand, the use of AAm monomer increased the paint adhesion properties and helped the resin to receive more aerogel (up to 5 wt %) which in turn decreased the heat loss of the painted wall. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45640.     

新型含磷环氧树脂的合成及性能研究

合成了一种新型含磷环氧树脂,采用化学分析和红外光谱研究了其结构及反应特性。采用DSC、UL-94垂直燃烧试验和氧指数法表征了含磷环氧树脂/4,4′-二氨基二苯砜(DDS)固化体系的玻璃化温度和阻燃性能,并测定了其拉剪性能及吸水率等。结果表明,含磷环氧树脂的最佳合成反应条件为:反应温度150℃,反应时间150 min,最佳固化工艺为130℃/1 h+160℃/2 h+180℃/2 h+200℃/2 h。磷质量分数为2%时,阻燃效果可达到UL-94-V-0级,同时具有较高的力学强度;固化物玻璃化温度为126℃,吸水率0.24%。该树脂可用于覆铜板等电子产品制造中,可操作性强,成本低。     

松香基超支化环氧树脂的合成及性能研究

首先以马来海松酸三缩水甘油酯(MPTGE)和马来海松酸(MPA)为主要原料,一步法合成松香基超支化聚酯(HPR),然后HPR再与环氧氯丙烷(ECH)经开环酯化、闭环反应,得到松香基超支化环氧树脂(HPER)。讨论了开环酯化、闭环反应中各因素对产物性能的影响,采用凝胶色谱仪、红外光谱仪对合成产物进行了表征,并确定了适宜的工艺条件:氯丙烷(ECH)与超支化聚酯(HPR)物质的量比为18∶1,开环反应以四丁基溴化铵为催化剂,用量为反应物总质量的2%,反应温度100℃;闭环反应中以氢氧化钠溶液作为中和剂,50℃下反应3 h。所得环氧树脂的环氧值为0.23 mol/100 g,粘度为850 mPa.s。     

核/壳型ACR乳液的聚合研究

采用预乳化工艺，种子聚合法，通过甲基丙烯酸甲酯(MMA)说明丙烯酸丁酯(BA)接枝共聚反应，制得具有核／壳结构的丙烯酸酯类抗冲击改性剂(ACR)乳液，讨论了乳化、剂用量、引发剂用量、交联剂用量及反应温度对乳液聚合和PVC性能的影响。     

新型聚丙烯酸酯无皂乳液的合成研究

以甲基丙烯酸甲酯、丙烯酸异辛酯、丙烯酸丁酯、丙烯酸羟乙酯及丙烯酸等单体合成了聚丙烯酸酯乳液,通过单因素实验,确定了聚合反应的最佳条件:反应温度为80℃,阴-非复合型可聚合乳化剂T-OP10用量为0.4%(对丙烯酸酯类总单体质量而言),预乳化液滴加时间为1 h,保温时间为1 h,引发剂KPS用量为0.4%。     

秸秆基环氧树脂乳液的制备及其涂膜性能

以脂肪醇聚氧乙烯醚(AEO-9)和十二烷基硫酸钠(SDS)复配为乳化剂,通过相反转技术乳化秸秆基环氧树脂,考察了复配乳化剂的HLB值、用量以及乳化温度和搅拌速率对乳液临界含水量Rf值、粒径及稳定性的影响,获得了如下较佳的乳化工艺条件:HLB值17,复合乳化剂用量8%,乳化温度35°C,搅拌速率800 r/min。以此工艺制得的乳液稳定性较好,平均粒径为1.57μm。以水性聚酰胺为固化剂,将此乳液制成清漆,固化后所得漆膜综合性能良好。