聚氨酯弛张筛板的研制

以聚酯多元醇、TDI、MOCA为原料研制了弛张筛板用浇注型聚氨酯弹性体。采用离心浇注法成型。讨论了原料、配方和成型工艺对弛张筛板性能的影响。所研制的筛板性能优异、质量稳定、使用寿命半年以上。     

聚氨酯筛板的生产工艺及性能比较

聚氨酯筛板是一种以聚氨酯为主要原料生产的网状制品,是众多弹性体中的一种。介绍了常压法浇注聚氨酯筛板的工业生产工艺,具体说明了预聚体的合成、常压下的浇注工艺——手工及机械浇注的方法,列表比较了聚氨酯筛板与钢制筛板的性能、各种聚氨酯筛板之间的性能比较及影响因素。     

聚氨酯驰张筛板的研制

以聚酯多元醇,ＴＤＩ、ＭＯＣＡ为原料研制了驰张筛板用浇注型聚氨酯弹性体。采用离心浇注法成。讨论了原料,配方和成地驰张筛板性能的影响。所研制的筛板性能优异,质量稳定,使用寿命半年以上。     

三分钟看懂浇注型聚氨酯弹性体

<正>什么是浇注型聚氨酯弹性体浇注型聚氨酯弹性体的定义浇注型聚氨酯弹性体(简称CPU),CPU在加工前成型前为粘性液体,故有"液体橡胶"之称,它是以液态低聚物多元醇、异氰酸酯和小分子扩链剂为原料,使用液体混合浇注的加工成型方法,经扩链交联反应得到固化交联的高弹性产物。浇注型聚氨酯弹性体(CPUE或称CPU弹性体)是向模腔中浇注液体反应混合物生产制品的化学体系。是聚     

全新工艺:浇注型聚氨酯可以实现注塑成型

<正>Adiprene C930是一种来自朗盛的低游离亚甲基二苯基二异氰酸酯(MDI)基浇注型聚氨酯,已被证明是适于注塑加工的材料。韩国Autox公司开发了一种新的生产工艺,使该浇注型聚氨酯能够注塑成型。这项创新为浇注型聚氨酯领域带来了新的视角,因为它结合了注塑成型的加工优势和浇注型聚氨酯的特性。采用注塑成型的好处是高效、经济,能在有限的时     

新型芳香二胺类扩链剂

随着我国国民经济建设的发展,聚氨酯弹性体的应用领域在不断扩大,如胶辊、筛板、垫块等大型制品的需要量日益增加。在工业生产中,浇注型聚氨酯橡胶采用机械连续法和手工间歇法加工制品。其中TDI—     

全新工艺:浇注型聚氨酯可以实现注塑成型

<正>Adiprene C930是一种来自朗盛的低游离亚甲基二苯基二异氰酸酯(MDI)基浇注型聚氨酯,已被证明是合适注塑加工的材料。韩国Autox公司开发了一种新的生产工艺,使浇注型聚氨酯能够注塑成型。这项创新为浇注型聚氨酯(CPU)领域带来了新的视角,因为它结合了注塑成型的加工的优势和浇注型聚氨酯的特性。Autox最近为采矿业推出了一种新型振动筛,该筛由该Adiprene浇注型聚氨酯预聚物通过注塑成型制成。     

TG型液体MDI

TG 型液体 MDI 是随着聚氨酯材料的发展而出现的一种异氰酸酯新品种。它是碳化二亚胺改性的4.4′—二苯基甲烷二异氰酸酯,室温下贮存稳定,适于反应注塑成型(RIM)技术和液体浇注成型工艺,是聚氨酯软泡、半硬泡、硬泡、弹性体、涂料、粘     

朗盛新技术助力实现浇注型聚氨酯弹性体的注射成型

<正>Adiprene?C930是特种化学品公司朗盛开发的一种独特的低游离MDI(二苯基甲烷二异氰酸酯)基浇注型聚氨酯,是一种适合注射成型的材料。韩国公司Autox开发了一种新生产工艺,可用于注射成型浇注型聚氨酯。该创新技术将注射成型的加工优势与浇注型聚氨酯的优异性能相结合,为浇注型聚氨酯带来了新的应用前景。Autox最近为采矿行业推出了一种新的振动筛,该振动筛由Adiprene?浇注型聚氨酯预聚物通过注射成型制成。     

浇注型聚氨酯筛板的成型工艺及设备

介绍了一种新型工业用筛板－浇注型聚氨酯筛板的成型工艺和成型设备。并将其与橡胶筛板的成型工艺和成型设备进行了对比。指出开发应用浇注型聚氨酯成型技术的重要性。     

Waterborne polyurethane dispersions obtained with polycarbonate of hexanediol intended for use as coatings

Three waterborne polyurethane dispersions derived from polycarbonate of hexanediol (PCD) with molecular weight of 1000 Da were synthesized by the acetone method and used as coatings for stainless steel plates. Different hard segments content in the polyurethanes were obtained by varying the isocyanate/macroglycol (NCO/OH) molar ratio. A decrease in the NCO/OH ratio produced an increase in the mean particle size as well as a decrease in the Brookfield viscosity of the dispersions. Furthermore, the greater the NCO/OH ratio the higher the urea and urethane hard segment content, the higher the glass transition temperature value and the higher the elastic modulus of the polyurethane was. On the other hand, the NCO/OH ratio affected the adhesion of the polyurethanes. The adhesion was evaluated by using three different procedures: T-peel strength tests of flexible PVC/waterborne polyurethane dispersion/flexible PVC joints; single lap-shear tests of aluminium/waterborne polyurethane dispersion/aluminium joints and cross-cutter adhesion test of polyurethane coatings on stainless steel pieces. Finally, several properties of the polyurethane coatings on stainless steel pieces were tested including Persoz hardness, gloss, chemical resistance and yellowness index.     

新型透明聚氨酯胶粘剂的研究

介绍了粘接聚碳酸酯－－聚碳酸酯板、聚碳酸酯－玻璃板、聚碳酸酯－有机玻璃板等透明防弹材料用透明聚氨酯胶粘剂的合成，讨论了原材料配比，NCO／OH的配比、水含量对胶粘剂性能的影响，确定了制备了工艺。     

聚氨酯弹性制品在矿山的应用

介绍了聚氨酯弹性制品筛板、实心轮、旋流器在矿山中的实际应用。     

A comparative study of epoxy and polyurethane based coatings containing polyaniline-DBSA pigments for corrosion protection on mild steel

Organic coatings based on epoxy and polyurethane matrices containing polyaniline doped with dodecyl benzene sulfonic acid (Pani-DBSA) were prepared and applied over steel plates (SAE 1020). The plates were submitted to salt spray chamber for up to 30 days in order to evaluate the corrosion protection of these coatings. The properties of the coated plates were analyzed as a function of time by electrochemical impedance spectroscopy, open circuit potential, optical microscopy, and Raman spectroscopy. In general, results indicate a decrease in the electrical resistance, increase in capacitance and decrease in open circuit potential. Epoxy based coatings have improved performance when Pani-DBSA is used as pigment, whereas for the polyurethane coatings, Pani-DBSA seems to play an adverse effect. Raman spectroscopy indicates a possible chlorination of the epoxy matrix after 30 days exposure to salt spray chamber.     

聚氯酯轮衬的研制

介绍了研制聚氯酯轮衬的配方和制作工艺。讨论了其影响因素。所研制轮衬性能优异、质量稳定、使用寿命长。     

Coatings prepared from waterborne polyurethane dispersions obtained with polycarbonates of 1,6-hexanediol of different molecular weights

Waterborne polyurethane dispersions (PUDs) were synthesized with polycarbonates of 1,6-hexanediol of different molecular weight (500–3000 Da) and their properties, adhesion (Hatch adhesion) and coatings on stainless steel properties (Pencil hardness, Persoz hardness, gloss at 60°, chemical resistance, yellowness index) were characterized. The hatch adhesion of the polyurethane coatings to stainless steel was very good and decreased slightly by increasing the molecular weight of the polycarbonate of 1,6-hexanediol. Both the Pencil and Persoz hardness values of the coatings increased by increasing the hard segments content in the polyurethane, i.e. by decreasing the molecular weight of the polycarbonate of 1,6-hexanediol, whereas the gloss and the yellowness index were lower for the coatings obtained with the polycarbonate of 1,6-hexanediol of molecular weight of 500 Da. Very good chemical resistance against ethanol for all polyurethane coatings on stainless steel plates was obtained but for long time of ethanol in contact with the coating surface the chemical resistance decreased, more markedly for the polyurethane coating obtained with the polycarbonate of 1,6-hexanediol of higher molecular weight. In summary, the segmented structure of the waterborne polyurethane dispersion determined the properties of the polyurethane coatings obtained from them.     

冷轧不锈钢板用大型聚氨酯胶辊的研制

介绍了冷轧不锈钢板用大型聚氨酯胶辊的研制过程,浇注工艺、胶料配方及产品性能     

Properties of polyurethane coatings containing additives of phenolic compounds

The properties of polyurethane containing five kinds of model phenolic additives were investigated. The IR spectra of polyurethane containing phenolic additives indicated that the phenolic additives reacted with isocyanate groups in a polyisocyanate compound. For an index of anticorrosion, the tensile adhesion strength was measured for polyurethane coatings with phenolic additives on steel plates treated with the salt‐water spraying test for 3000 h. It was found that there was a relationship between the tensile adhesion strength of polyurethane and the density. We considered the reason to be that the increase in density (i.e., a reduction in free volume) should provide a route to reduce salt‐water access to an adhesive bond. The increase in density was explained by the term antiplasticizers, which means that the phenolic additives reduce the free volume that is available for molecular motion in the stiff chain of polyurethane. In the polyurethanes with every phenolic additive, the elongation was increased, the moduli were decreased, the storage modulus was decreased, and the coefficient of thermal expansion was increased. These phenomena are the characteristics of plasticizers. Thus, the phenolic additives have both the character of antiplasticizers and plasticizers, but the polyurethane with phenolic additives had more characteristics of plasticizers than those of antiplasticizers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2099–2106, 2006     

Incidence of the polyol nature in waterborne polyurethane dispersions on their performance as coatings on stainless steel

Three waterborne polyurethane dispersions derived from polyester, polyether and polycarbonate diols with molecular weight of 1000 Da were synthesized by the acetone method and used as coatings on stainless steel 304 plates. The properties of the dispersions and the polyurethane films were influenced by the polyol nature. The polyurethanes obtained with polyether or polyester showed higher degree of phase separation between the soft and the hard segment. The higher adhesive strength under shear stresses was obtained in the joints produced with the waterborne dispersion obtained with polycarbonate diol. The properties of the polyurethane coating obtained with polycarbonate diol on stainless steel 304 were significantly higher as compared with the others. Improved performance of coatings obtained with polycarbonate diol was ascribed to the higher polarity of the carbonate groups that contributed to additional hydrogen bond formation between soft segments with respect to those obtained with polyether or polyester