含凝胶消光PVC树脂的消光性能研究

介绍了消光聚氯乙烯树脂的性能，研究了聚合度、凝胶含量、膨润度、交联剂等对消光性能的影响，以及增塑剂用量、加工温度、混炼时间等对制品消光性能的影响，并探讨了消光原理。     

消光PVC树脂的加工与应用

介绍了消光PVC树脂的应用及性能,研究了消光PVC树脂的凝胶含量、用量等因素对制品的消光性能及塑化性能的影响.     

消光PVC树脂合成与加工成型的研究

研究了交联剂用量及加入方式、聚合温度对PVC树脂消光性能的影响,以及挤出温度对PVC制品消光性能的影响;对比了采用普通PVC树脂加消光剂生产的制品与采用消光PVC树脂生产的制品的消光性能。结果表明:①消光PVC树脂最佳的生产工艺为交联剂用量在0.3份左右,聚合过程中交联剂采用连续加入的方式,聚合温度应根据PVC制品凝胶含量的需求进行设定;②当挤出机各段温度分别为130、145、150、155℃,模头温度为165℃时,PVC制品的消光性能最好;③与采用加消光剂的方式相比,采用消光PVC树脂生产的制品消光性能更好。     

消光聚氯乙烯树脂的合成与表征

介绍了含凝胶消光聚氯乙烯树脂的合成和表征方法，报道了交联剂品种及用量、聚合温度等因素对消光聚氯乙烯树脂的凝胶含量、可溶分分子量、膨润度等内在性能的影响，以及凝胶含量与膨润度的关系。     

消光PVC专用树脂结构评价及测试方法的探索

研究了测试方法、样品预处理和后处理、抽提时间和温度以及样品溶解和溶胀条件对消光PVC树脂溶胶聚合度、凝胶含量以及凝胶体积膨润度的影响,确定了消光PVC树脂溶胶聚合度、凝胶含量、凝胶体积膨润度的测试方法。     

消光聚氯乙烯热塑性弹性体的研究及应用

主要以高聚合度以及含22％左右凝胶量的聚氯乙烯树脂为研究对象，探讨了不同聚合度的聚氯乙烯树脂、增塑剂、填充剂及加工温度对共混物力学性能及消光性能的影响。     

低聚合度消光PVC树脂的研制

研究了低聚合消光PVC树脂生产中，消光剂品种的选择、复配、用量、加料方式及聚合温度控制等对低聚合度消光树脂的性能影响，并对该工艺下制备的低聚合度消光树脂进行了物化性能、相对分子质量及其分布、颗粒形态及消光性能检测，最终生产出分子量≤700，凝胶含量≥25%的低聚合度消光树脂。     

环保聚氯乙烯增塑糊凝胶性能的研究

采用转矩流变仪和旋转黏度计研究了PVC树脂种类、增塑剂种类、掺混树脂加入量对环保PVC增塑糊凝胶性能的影响规律。结果表明,PVC糊树脂聚合度越大,增塑糊的凝胶化时间越长;颗粒呈规则圆状树脂配制的增塑糊,其凝胶时间相对较长;颗粒呈扁片状的树脂配制的增塑糊,其凝胶时间相对较短。增塑剂与PVC糊树脂相容性越差,增塑糊的凝胶时间越长。随掺混树脂添加量的增多,凝胶时间逐渐延长,当其加入量为40 份（质量份,下同）时,凝胶时间从空白时的18 min延长至28 min。     

PVC消光树脂的生产现状及技术

介绍了PVC消光树脂的发展现状、合成工艺、性能表征方法、凝胶含量的影响因素以及加工性能,总结了引发剂对聚合反应的影响及PVC消光制品消光性能的影响因素。     

PVC糊凝胶化过程的调控方法研究

本文研究了通过调整加热温度与时间,适当选用PVC糊树脂以及不同增塑剂混用等措施对PVC糊凝胶化过程进行调节与控制的方法。     

二甲苯型氰酸酯/环氧树脂固化体系介电性研究

通过介电性能和吸水率测试研究了二甲苯型氰酸酯(DMBPCN)与环氧树脂(EP)不同配比对其共混体系固化物性能的影响。结果表明,随着DMBPCN用量增加,DMBPCN/EP固化物中极性基团减少,介电性能提高。当DMBPCN添加质量分数为90%时,DMBPCN/EP固化物在沸水中浸泡100 h后吸水率仅为0.64%。MBPCN/EP固化体系的耐水性能和介电性能较常用的双酚A氰酸酯/环氧树脂体系高。     

氯化聚氯乙烯的制备及重要性能比较

将SG-3、SG-5、SG-8三种型号的PVC通过水相悬浮法分别氯化得到四种氯含量不同的产品,然后重点考察增塑剂吸收量随着氯含量改变的变化规律及最终产品的热性能比较,最后得出结论：（1）随着氯含量的增加,SG-3PVC树脂氯化后CPVC产品的增塑剂吸收量逐渐减小;SG-5PVC树脂氯化后CPVC产品的增塑剂吸收量先减小后增大;SG-8PVC树脂氯化后CPVC产品的增塑剂吸收量先增大后减小最后又增大。（2）随着氯含量的增加,三种原料氯化后产品树脂颗粒的粒径都逐渐增大,只是增大幅度变化不同。     

绿色建材专用PVC树脂R-1000的特性及其加工和应用

简述了上海氯碱化工股份有限公司开发的PVC树脂R—1000的合成工艺，并从PVC树脂的质量指标、颗粒特性、加工性能、VC脱吸速率及残留VC含量等方面对R—1000产品与国外同类样品进行了分析对比。分析结果表明，PVC树脂R—1000的性能已达到国际水平，充分体现出其用于硬制品挤出成型的优势。经加工应用，该公司开发的PVC树脂R一1000受到用户的欢迎和认可。     

Influence of glyoxal on curing of urea-formaldehyde resins

In the present paper, the effect of glyoxal on the gel formation within the adhesive systems based on urea-formaldehyde (UF) resins is shown. A reduction of formaldehyde content in wood-based panels by decreasing the formaldehyde/urea molar ratio in the UF resins leads to increasing of the UF resin gel time, and impairing the qualitative characteristics of the UF-based wood materials. Glyoxal is shown to speed up the crosslinking of the macromolecules as well as significant reduction of gel time of adhesive composition. The first reason is the result of reaction between glyoxal and ammonium ion leading to protons releasing. Another reason is that glyoxal and its interaction products react with macromolecules of the UF resin forming a three-dimension cross-linked structure. The gel time and the pot life of the UF resin are measured by the oscillatory viscometer. Formation of the UF cross-linked resin structure with glyoxal and a curing catalyst (ammonium sulfate) is studied using dispersion Raman scattering spectroscopy. Particleboards (PB) are produced using different amount of glyoxal and formaldehyde/urea molar ratio in the UF resin. The properties are evaluated according to the European Standards and include density, internal bond, thickness swelling moisture content and formaldehyde content.     

EBR胶乳凝胶的控制及其对ABS树脂冲击性能的影响

主要讨论了摩尔质量调节剂，延长后期反应时间，提高后期反应温度，过硫酸钾用量等对乙烯－丁二烯橡胶（EBR）胶乳凝胶的影响；同时讨论了低凝胶条件和高凝胶条件下凝胶对ABS树脂性能的影响。结果表明：低凝胶条件,ABS树脂的冲击性能随凝胶质量分数的增加而增加；高凝胶条件下，则随凝胶质量分的增加而降低，得到了EBR胶乳生产中凝胶的主要控制方法，并通过控制EBR胶乳凝胶来实现对ABS树脂冲击性能的控制。     

Improving the properties of ionic liquid-treated lignin-urea-formaldehyde resins by a small addition of isocyanate for wood adhesive

The aim of this research was to investigate the effect of polymeric 4, 4 diphenyl methane diisocyanate (pMDI) on the physical and mechanical properties of plywood panels bonded with an ionic liquid (IL)-treated lignin-urea-formaldehyde resin. Soda lignin modified by 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) IL was added to a urea formaldehyde (UF) resin during resin synthesis to prepare a lignin-urea-formaldehyde (LUF) resin. pMDI at various contents (2, 4, and 6% on resin solids) was then added to prepare a LUF resin. The thermal and physicochemical properties of the resins prepared as well as the water absorption, shear strength, and formaldehyde emission of the plywood panels bonded with them were measured according to standard methods. DSC analysis indicated that the addition of pMDI decreases the gel onset and curing temperatures of the LUF resin. According to the results obtained, the addition of pMDI significantly increased the viscosity and solid content and accelerated the gelation time of LUF resins. Based on the findings of this research, the addition of pMDI dramatically improves the performance of LUF resins as a new adhesive for wood-based panels. The LUF resins with isocyanate added yielded panels presenting lower formaldehyde emission and lower water absorption content when compared to those bonded with the control LUF resins. Greater dry and wet shear strength can be obtained by a small addition of pMDI to LUF resins.     

快速高吸有机溶剂树脂制备及其性能研究

采用悬浮聚合的方法,以甲基丙烯酸十八烷基酯、丙烯酸丁酯、苯乙烯为单体制备了三元高吸有机溶剂树脂,并探索了交联剂用量对三元高吸有机溶剂树脂的饱和吸附率的影响。结果表明,采用位阻小的1,4丁二醇二甲基丙烯酸酯为交联剂,当交联剂用量为单体总质量的0.25 %时,树脂的饱和吸附率最高;树脂对甲苯、氯仿、正己烷、二氯甲烷的吸附在15 min内均达到饱和状态,饱和吸附率分别为23.18、34.00、15.86、22.20 g/g,说明所制备的三元高吸有机溶剂树脂具有优异的吸有机溶剂性能。     

Synthesis of bio-based epoxy resin from gallic acid with various epoxy equivalent weights and its effects on coating properties

The bio-based epoxy resins for coating application were synthesized from gallic acid (GA) in various molar ratios with epichlorohydrin (ECH). The reaction was carried out in the presence of sodium hydroxide (NaOH) and phase-transfer catalyst tetrabutylammonium bromide. The reaction progress rate at various molar ratios as 1:8, 1:12, and 1:16 with respect to time was monitored by calculating the epoxy content. The epoxy content value increases in the product as the molar ratio of GA to ECH increases. Epoxy equivalent weight of products was evaluated by physiochemical method and structure illustrated by Fourier transform infrared and ¹H-nuclear magnetic resonance spectroscopy. This bio-based epoxy resin was cured with polyamide hardener, and the coating properties such as mechanical, chemical, and solvent resistance were studied. The cured films have been evaluated for glass transition temperature (T _g) and thermal behavior by a differential scanning calorimeter and thermogravimetric analysis, respectively. The bio-based epoxy coatings show interesting mechanical, chemical, and thermal properties as compared to the conventional epoxy resin. The gel and water absorption of polyamide-cured coatings has also been evaluated.     

交联结构对苯类吸收树脂性能的影响

采用悬浮聚合法制备了球形苯类吸收树脂,研究了交联剂用量与树脂的吸收倍率、交联密度和凝胶分数之间的关系,探讨了交联结构对树脂吸收和释放动力学的影响,并采用扫描电镜考察了树脂的微观形貌。结果表明:随着交联剂用量的增加,吸收树脂的凝胶分数和交联密度不断增大,吸收倍率出现峰值;随着交联密度的提高,吸收树脂对甲苯的吸收速率和释放速率均减慢,吸收动力学常数与释放扩散系数都不断降低;树脂对甲苯的吸收动力学过程符合准一级动力学方程;得出了形式简洁的吸收树脂释放动力学方程,能够很好地描述吸收树脂释放甲苯的动力学行为;吸收树脂的交联结构稳定,再生重复使用10次以后树脂微球的大小、形貌和吸收倍率均无明显变化。