浅谈叔醋乳胶涂料的研制

在建筑涂料迅速发展的今天，欲提高产品性能，就必须开发使用新的单体共聚，如周叔碳酸乙烯酯单体改性醋酸乙烯，经合理工艺可制成理想的乳胶漆。本文简介了该乳胶漆的研制方法。     

水性涂料用醋丙乳液的研制

本采用种子乳液聚合方法合成了一种高性能醋酸乙烯-丙烯酸丁酯共聚乳液，讨论了聚合过程中单体的选择、聚合温度、乳化剂的配比及用量和引发剂等因素对产品性能的影响，确定了聚合配方和聚合工艺，经实验测试，乳液性能良好。     

纳米二氧化硅/聚丙烯酸酯乳胶涂料涂膜的制备及性能研究

分别采用水溶性有机硅偶联剂和无皂乳液聚合方法 ,在水介质中研究了纳米二氧化硅的表面改性。经改性后纳米二氧化硅的团聚体尺寸由原来 2 0 0 nm左右减少到 80 nm。实验表明加入纳米二氧化硅的复合聚丙烯酸酯乳胶涂料涂膜的力学性能有了较大的改善 ,并使其耐洗刷性能得到提高。     

氯—醋—丙三元共聚乳胶涂料的研究

介绍了氯-醋-丙三元共聚乳液的合成及其涂料的配制。并讨论了氯乙烯单体的加入量对涂膜耐碱性,耐水性的影响及基料与体质颜料的配比与涂膜性能之间的关系。     

建筑乳胶涂料基本原材料选择

介绍了建筑乳胶涂料用乳液,颜填料,助剂等原材料的主要种类及选用原则。     

纳米SiO2改性纯丙乳液的合成及性能研究

用纳米SiO2胶体、苯乙烯、甲基丙烯酸及其酯、反应性乳化剂、交联剂、偶联剂等成功地合成了常温自交联纯丙乳液，着重介绍了纯丙乳液的合成、性能，讨论了单体加入方式、反应温度、引发剂用量、乳化剂用量、纳米SiO2胶体添加量、pH值、聚合工艺等因素对乳液合成的影响，并对其进行了表征。     

纳米涂料及其开发应用

介绍了纳米涂料的种类,国内外的开发现状,并展望了纳米涂料的发展前景。     

新型硅-丙乳液及其建筑涂料的合成与性能研究

以乙烯基环硅氧烷(D4vi)与丙烯酸(酯)为原料、(NH4)2 S2O8-Na2SO3为氧化-还原引发体系,采用乙烯基环硅氧烷的开环聚合和缩聚以及丙烯酸(酯)类单体自由基聚合同步进行的制备方法,制得了一种新型的硅-丙乳液,其特点是乳胶粒子内部的相容性较好、没有明显相分离;使用该硅-丙乳液制备的建筑涂料,具有铅笔硬度高,耐沾污性、耐水性,以及耐碱性优异的特点。探讨了聚合反应温度、催化剂种类以及用量、有机硅的用量、功能单体种类及用量对乳液的影响,分别用傅里叶红外光谱仪、透射电子显微镜、原子力显微镜对乳液结构及状态进行了表征。     

建筑乳胶涂料防霉性的研究

从霉变建筑乳胶涂膜上分离出曲霉属、短梗霉属和帚霉属3种霉菌属,研究了建筑乳胶涂料的防霉性。确定了5种常用防霉剂对霉菌的最低抑制浓度。筛选了适用于建筑乳胶涂料的两种复合防霉剂组合,考察了它们在涂料中的防霉效果。     

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。     

羟乙基纤维素添加在醋丙乳液中做保护胶体的初步研究

采用羟乙基纤维素为保护胶体制备了醋丙乳液,探讨了乳液聚合过程中共聚单体配比、保护胶体用量、温度和引发剂等因素对乳液聚合的影响,多方面考察乳液的性能.结果表明：羟乙基纤维素为保护胶体可制备稳定的醋丙乳液,该乳液具有优良的电解质性能.     

改性聚醋酸乙烯乳液拼板胶的研制

研究了甲苯二异氰酸酯 -三羟甲基丙烷加成物及其用量对聚醋酸乙烯乳液拼板胶粘合性能的影响。     

Synthesis of poly(vinyl propionate) from poly(vinyl alcohol) in nonaqueous medium using ethyl nitrate dimethyl sulfoxide as a catalyst

Poly(vinyl alcohol) (PVA) can be dissolved in a nonaqueous medium in the presence of catalytic concentration of ethyl nitrate dimethyl sulfoxide, C₂H₅ONO₂·DMSO. From the PVA solution, poly(vinyl propionate), PVPR was prepared by the homogeneous esterification of PVA with propionic acid. The ester thus formed contained some unconverted hydroxyl group. The formation of the ester was confirmed by the IR and ¹H‐NMR spectra. The molecular weight of the ester was determined by GPC and intrinsic viscosity (η) was determined by viscometric method. Glass transition temperature, T_g, was obtained from differential scanning calorimetric (DSC) analysis. Thermal stabilities of the ester were checked by thermogravimetric analysis (TGA) and differential thermogravimetric (DTG) analysis. The efficiency of the ester as a flow improver of crude oil was also examined. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5675–5679, 2006     

Synthesis of high-molecular weight poly(vinyl alcohol) by low-temperature emulsifier-free emulsion polymerization of vinyl acetate and saponification

High-molecular weight (HMW) poly(vinyl alcohol) (PVA) was prepared via an emulsifier-free emulsion polymerization of vinyl acetate (VAc) using a redox initiation system in low temperatures, and the subsequent saponification with potassium hydroxide in methanol. The effect of the polymerization conditions on the conversion, molecular weight, and branching degree was investigated. PVA with maximum viscosity-average degree of polymerization (DP) of 8270 could be prepared by saponification of poly(vinyl acetate) (PVAc), with DP of 10,660 obtained at temperature of 10°C, monomer concentration of 30%, potassium persulfate molar ratio to monomer of 1/2000, agitation speed of 160 rpm. The conversion was above 90%. From the emulsifier-free emulsion polymerization of VAc in low temperature, PVAc with HMW and high linearity was effectively prepared, which might be useful for the preparation of high-strength and high-modulus PVA fiber. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

聚醋酸乙烯乳液保护胶体的改性

介绍了聚醋酸乙烯乳液保护胶体改性的一些现状和进展。包括聚乙烯醇的缩醛化、酰基化、烷基化、醋酸乙烯共聚物皂化、添加剂改性等方法以及其他保护胶体的应用。     

Surface grafting of a poly(organophosphazene) onto poly(vinyl alcohol) and poly(ethylene-co-vinyl alcohol) using triethoxysilane as a coupling agent

Triethoxysilane HSi(OEt)₃ was used as coupling agent to graft a poly(organophosphazene) (POPZ) containing allylic functions to the surface of poly(vinyl alcohol) or poly(ethylene-co-vinyl alcohol) films. Hydrolyzed HSi(OEt)₃, which contained both inorganic (Si–OH) and organic (Si–H) reactivities, acted at the interface between the hydroxylated substrates (via a condensation reaction) and the allylic functions in POPZ (via a hydrosilylation reaction). Starting materials and grafting surfaces were studied by ATR-IR and XPS spectroscopies and contact angle measurements. Data obtained indicated that different POPZ layers were produced, depending on whether the functionalization of materials with silane, and the grafting reaction were separately or simultaneously made. The POPZ layer thickness was higher when the grafting reaction was preceded by the POPZ functionalization. In each cases, the modified surfaces showed marked increases in hydrophobicity character. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1965–1974, 1998     

Mechanochemical preparation of a novel polymeric photostabilizer for poly(vinyl chloride)

The preparation of a novel polymeric photostabilizer was carried out via the vibromilling of poly(vinyl chloride) (PVC) powder, a reactive light stabilizer (r‐LS), and a peroxide initiator in ball‐containing jars with a planetary ball mill for a certain time. The effects of the initiator content, milling time, and temperature on the grafting ratio were studied with gravimetric analysis and intrinsic viscosity measurements. Fourier transform infrared and ultraviolet–visible spectra were used to investigate the structural development of the mixture of the r‐LS and PVC during vibromilling. The results showed that the r‐LS was grafted onto PVC chains successfully, and the aforementioned factors had a significant effect on the grafting ratio. The optimum preparation conditions were 0.5 wt % initiator, 8 h, and 20°C. A grafting mechanism is proposed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Physical properties of acrylic copolymer emulsions using poly(vinyl alcohol) as a protective colloid in comparison with those using surfactants

Properties of copolymer emulsions of methyl methacrylate and butyl acrylate prepared using poly(vinyl alcohol) (PVA) as a protective colloid have been studied and compared with those prepared using anionic and anionic/non‐ionic surfactants. The emulsions with PVA revealed a Newtonian flow, while those with surfactants had a thixotropic flow. Cast films of the emulsions with PVA afforded much larger tensile strengths, higher Young's moduli, and poorer resistance to water compared with those with surfactants. Adhesive layer composed of the copolymers with PVA revealed markedly higher creep resistance to shearing stress, while that with surfactants had poor resistance; these phenomena appear to arise from the canal‐like morphology of PVA in the former cast films, while the surfactants in the latter existed in island morphology. © 2000 Society of Chemical Industry     

Controlled synthesis of poly(vinyl acetate) by traditional radical emulsion polymerization

A new redox initiation system, potassium persulfate/N,N‐dimethylethanolamine, was used to initiate traditional radical emulsion polymerization of vinyl acetate at low temperature. Polymers were characterized using gel permeation chromatography, scanning electron microscopy and dynamic light scattering. The results showed that poly(vinyl acetate) with high molar mass and small dispersity (?) was successfully synthesized. © 2016 Society of Chemical Industry