元素有机聚合物及其涂料

涂料用封闭异氰酸酯有机硅树脂、可固化涂料的制备及热固化的涂膜;含水溶性有机硅聚合物的涂料组合物、其制备及用该涂料涂覆的物件和材制;用于各种难附着底材的密封材料的底漆组合物;含硅氧烷的基料分散体;可交联的聚硅氧烷涂料组合物     

甲基丙烯酸烯丙酯改性水性丙烯酸-聚氨酯分散体的合成与性能

以甲基丙烯酸烯丙酯（AMA）为交联单体,采用原位聚合法工艺合成具有高消光效率的水性丙烯酸–聚氨酯（PUA）分散体并制成水性亚光涂料。通过红外光谱确定了PUA分散体的合成。研究了AMA单体用量对PUA分散体和涂膜性能的影响,并对比了AMA与甲基丙烯酸缩水甘油酯（GMA）、二乙烯基苯（DVB）、双丙酮丙烯酰胺/己二酰肼（DAAM/ADH）交联体系对PUA分散体的粒径、粒径分布以及PUA涂膜消光效率的影响。研究发现：随着AMA单体用量的增加,PUA分散体的pH值逐渐下降,粒径增大,黏度逐渐降低。由于交联密度的增加,PUA涂膜的摆杆硬度升高,耐碱和耐醇性能也得到提高。采用AMA交联获得的PUA分散体粒径分布更窄,消光效率更高,制备的水性亚光涂料的光泽最低。     

多重交联紫外光固化水性聚氨酯涂料

采用接枝聚合制备了紫外光固化丙烯酸酯接枝聚氨酯水性分散体,引入PETA提高了双键含量,最大双键含量达到4.80 MEQ/g,采用1,4-丁二醇、三羟甲基丙烷、环氧树脂、水性涂料固化剂和紫外光固化实现漆膜的多重交联,提高了分散体的相对分子质量和固化漆膜的交联程度以及耐水性、耐溶剂性和硬度.     

聚氨酯树脂及其涂料

200801017 甲硅烷基化聚氨酯-聚脲保护涂料组合物及甲硅烷基化聚氨酯-聚脲的制备;200801018 含用封闭多异氰酸酯可交联的基料的非水性液体涂料组合物;200801019 形成柔软、弹性厚涂膜的涂料组合物、涂料及三维形成法;200801020 用于涂覆金属表面的耐化学和防腐水性组合物;200801021 水性聚氨酯分散体……     

纸张涂料

用作纸张涂料基料的在无机聚合物粒子存在下的聚合物分散体的制备,在树枝状粒子存在下制备的用作纸张涂料基料的高固体水性聚合物分散体,纸张涂料用含有使用阳离子预聚物作为介质制备的细粒子的阳离子聚合物分散体     

多重交联紫外光固化水性聚氨酯涂料

通过环氧树脂改性以及多元醇内交联、六甲撑二异氰酸酯(HDI三聚体)交联改性、固化剂交联和紫外光交联等四重交联,并加入季戊四醇三丙烯酸酯(PETA)作为接枝化合物,合成了紫外光固化水性聚氨酯丙烯酸酯分散体(WPUD).研究了环氧树脂改性以及PETA含量对漆膜性能的影响.结果表明,经过环氧改性,采用2.5%的HDI三聚体和13.6%的PETA合成的水性聚氨酯丙烯酸酯分散体,其漆膜吸水率为6.3%,耐丙酮擦洗360次,摆杆硬度0.79.所得漆膜达到或超过了溶剂型紫外光固化涂料的要求.     

丙烯酸树脂及其涂料

题述软链节化合物的方法,给出了以二元醇和聚醋软链节组分为基础的聚氨醋基料少UR)的合成配方。研究了各种二元醇的性质和用量对三聚氰胺树脂交联的PUR分散体涂料性能的影响,与只用聚醋软链节制成的常规PUR分散体相比,这种涂料具有较高的硬度、柔韧性和抗石击性。0005002适用于涂料的水稀释性丙烯酸基料的制备:EP942049[欧洲专利公开,德l/奥地利:Vianova Resins AG(wilfin罗r,werner等)一1999.9 .15一10页一户丁1998/4 29(1998.3.11):IPC C09D5102 题述基料适用于单组分或双组分的涂料、粘合剂、胶水和浸渍材料。该基料含有非水溶性…     

水性涂料

201009055水性分散体溶液、其制备,水性分散体组合物及含该水性分散体的底漆、涂料、油墨和胶粘剂：JP2010-84139[日本专利公开]/日本：Nippon Paper ChemicalsCo.,Ltd.（Yada,Minoru等）.-2010.04.15.-19     

水性涂料

乙烯改性环氧酯水分散体的制备及由其制得的具有较好颜料分散性、耐腐蚀性和光泽的水性涂料组合物,涂料用聚合物分散体,由水性可发泡耐火涂料制备的耐水性和持久性好的阻燃层压件,低温柔韧性好的水性涂料组合物、其涂装方法和含该组合物的多层涂膜     

多重交联紫外光固化水性聚氨酯涂料

通过环氧树脂改性以及多元醇内交联、六甲撑二异氰酸酯(HDI三聚体)交联改性、固化剂交联和紫外光交联等四重交联,并加入季戊四醇三丙烯酸酯(PETA)作为接枝化合物,合成了紫外光固化水性聚氨酯丙烯酸酯分散体(WPUD)。研究了环氧树脂改性以及PETA含量对漆膜性能的影响。结果表明,经过环氧改性,采用2.5%的HDI三聚体和13.6%的PETA合成的水性聚氨酯丙烯酸酯分散体,其漆膜吸水率为6.3%,耐丙酮擦洗360次,摆杆硬度0.79。所得漆膜达到或超过了溶剂型紫外光固化涂料的要求。     

微生物凝固天然橡胶交联密度的研究

采用核磁共振交联密度仪,考察了微生物凝固天然橡胶（NR-m）和酸凝固天然橡胶（NR-a）在硫化过程交联密度（XLD）、网链含量（AMc）、自由小分子含量（AT2）以及相邻交联点间的分子质量（Mc）的动态变化规律。研究结果表明,NR-m硫化胶的XLD比NR-a的高,NR-m硫化胶磁化曲线随时间衰减的速率比NR-a快,纵向松弛时间（T1）和横向驰豫时间（T2）比NR-a低,NR-m硫化胶网链部分的质量含量（AMc）明显高于NR-a的,而自由末端数则明显比NR-a的低。这表明微生物凝固法促进了天然橡胶的硫化作用,提高了硫化胶的交联密度。     

Characterization of Polyurethane Grafted with Bis(2-hydroxyethyl) Terephthalate

Bis(2-hydroxyethyl) terephthalate (BHETPA) was grafted onto polyurethane (PU) to investigate the effects of BHETPA, which contains a rigid aromatic group and flexible hydroxyethyl groups, on the physical properties of PU. The cross-link density, viscosity, tensile strength, and shape recovery notably increased with an increase of BHETPA due to chemical cross-linking by BHETPA. A PU sample demonstrated excellent low-temperature flexibility compared with plain PU, showing complete recovery at approximately 0°C. Therefore, grafting BHETPA onto PU modified the thermal behavior and greatly improved the tensile stress, shape recovery, and low-temperature flexibility of PU compared to plain PU.     

交联处理对Lyocell纤维抗原纤化性能的影响

对尚未干燥过的初生Lyocell纤维进行交联处理,并分析了各种交联条件下所制得的Lyocell纤维的原纤化性能。研究结果表明,交联剂的浓度及浸润时间、碱剂的浓度及处理时间都会对控制最终纤维的原纤化程度产生一定的影响。在研究范围内,当交联剂的体积质量浓度为40g/L、浸润时间为40min,且碱剂的体积质量浓度为30g/L、处理时间为30min时,最终所得Lyocell纤维的抗原纤化能力比未处理的普通Lyocell纤维提高了约7倍,由此表明交联处理是提高Lyocell纤维抗原纤化性能的一种有效途径。对纤维微观结构的分析结果进一步表明,经交联处理后,Lyocell纤维的基纤及基纤聚集束的尺寸减少且含量增加,这是导致纤维抗原纤化能力提高的关键结构原因。     

化学生物学的科学内涵及其发展

化学生物学是化学和生物学的交叉科学 ,是利用化学的理论、研究方法和手段来探索生物医学问题的科学。化学生物学正迅速成为一个重要的交叉学科领域 ,因此 ,对每个化学研究者来说 ,了解和掌握化学生物学是非常重要的     

Nanoclay reinforced UV curable waterborne polyurethane hybrids

Waterborne polyurethane (PU)/clay nanocomposites were synthesized by incorporating the chemically modified clay into the main chain of PU by UV cure where modification was made using vinyltrimethoxysilane (VTMS) via sol–gel reaction. It was found that VTMS modified clay gave dual effects of multifunctional cross-link as well as reinforcing filler and significantly augmented hardness, tensile modulus and strength, rubbery modulus, gel content and swelling resistance, glass transition temperature and thermal stability of the waterborne PU.     

Preparation and anticorrosive behavior of epoxy-polysiloxane hybrid coatings modified by polyetheramines

Inorganic/organic hybrid coatings based on epoxy-polysiloxane resin were prepared by using five types of curing agents, including 3-aminopropyltriethoxysilane (APTES) alone (control coating) and the mixtures of four types of polyetheramines (Jeffamine D230, D400, T403, and THF100) along with APTES (modified coatings). The mechanical, adhesion, and corrosion resistance properties of the hybrid coatings cured by different curing agents were studied. The dynamic mechanical thermal analysis results showed that the glass transition temperature and cross-link density of the modified coatings decreased with increasing of the chain length of polyetheramines. The impact resistance height of the modified hybrid coatings was more than one time higher than that of the control coating. The adhesion of the modified hybrid coatings was enhanced compared to the control coating except the coating modified by THF100. Compared with the control coating, comparable hardness and improved wet adhesion were attained for the coatings modified by polyetheramines D230 and T403 with shorter chain length, while the hardness and wet adhesion were decreased for the coatings modified by polyetheramines D400 and THF100 with longer chain length. The corrosion resistance behavior of the hybrid coatings was thoroughly examined by electrochemical impedance spectroscopy and salt spray tests. It was found that the corrosion resistance behavior of the hybrid coatings increased with D230 and T403 due to higher cross-link density and decreased with D400 and THF100 due to lower cross-link density.     

配合胶乳和硫化胶乳胶膜干燥历程及交联密度比较研究

采用热风干燥方法进行配合胶乳和硫化胶乳胶膜的干燥实验,研究了两种天然胶乳胶膜的千燥动力学过程及干燥过程与橡胶分子链交联密度的关系。结果表明,配合胶乳膜干燥的活化能Ea1=314kJ·mol^-1,硫化天然胶膜的干燥活化能Ea2=63．6kJ·mol^-1,配合胶乳膜较硫化胶乳膜易于干燥;在相同条件下,配合胶乳膜的交联密度始终低于硫化胶巍膜。配合胶乳膜和硫化胶乳膜的干燥过程与硫化过程并不同步,过度的加热干燥会导致交联密度的降低。     

Properties enhancement of magnesium phosphate cement by cross-linked polyvinyl alcohol

A novel ceramic composite has been obtained by introducing polyvinyl alcohol in magnesium-based chemically-bonded ceramics and exploiting the cross-link reaction with glutaraldehyde during setting. The properties of the obtained material and the interaction of the polymer with the cement reaction have been investigated. Several beneficial effects were observed. Namely, an extension of the working time, a reduction in the water sensitivity, a decrease in the rate of the heat evolution during hardening. The latter has been ascribed to the intervention of surface adsorption processes, which hindered the dissolution of MgO, as well as the nucleation and growth of the magnesium phosphate products, in concert with the film forming ability of the polymer. Thanks to the complementarity of their mechanical properties, the cement and the additive operated in a synergistic fashion, allowing for the obtainment of a material possessing higher strength and better elastic properties. Three-dimensional quantitative image analysis from synchrotron X-ray microcomputed tomography evidenced the development of a more compact microstructure, comprising a higher number of crystals of smaller size. As a consequence, the pore network exhibited a higher fraction of small pores and lower pore connectivity. These characteristics contributed to hinder the water absorption, as confirmed by the fluid transport simulations within the volume. The observed correlation between the solution pH and the polymer cross-link density offers the way to effectively modulate the material performance by acting on the chemical environment thanks to its compatibility with the cross-link reaction.     

The temperature-sensitive water vapor permeation control of polyurethane membrane using the graft-polymerized poly(N-isopropylacrylamide) and the impact on the tensile strength and shape recovery effect

Poly(N-isopropylacrylamide) (poly(NIPAM)) was grafted onto polyurethane (PU) using a graft-polymerization method to develop a thermo-responsive PU and to investigate the impact on cross-link density, solution viscosity, soft segment thermal transitions, tensile properties, shape memory effect, and water vapor permeation through PU membrane. The soft segment crystallization peak sharply decreased with the increase in NIPAM content, whereas the glass transition temperature (T_g) slightly increased with the increase of NIPAM content. The breaking tensile stress rapidly increased with the increase in NIPAM content due to the cross-linking effect between the grafted poly(NIPAM) chains, whereas the strain at break did not significantly decreased as the NIPAM content increased. The shape recovery at 10°C rapidly increased from 46.9% for plain PU to above 90% after the grafting of poly(NIPAM) onto PU, and the shape retention at ?25°C slightly decreased with the increase in NIPAM content. Finally, the grafting of poly(NIPAM) onto PU demonstrated the temperature-responsive control of water vapor permeation through PU film due to the conformational change of the grafted poly(NIPAM) with the increase of temperature and the potential applications of the resulting PUs are discussed.     

新型弱凝胶的交联及其性能研究

针对一种新型自组装聚合物,通过优选交联剂体系形成弱凝胶提高其抗温性及抗盐性,并对其性能进行评价。结果表明,在80℃,矿化度50 000 mg/L时,弱凝胶粘度保留率超过75%。