Study on the Synthesis of Polyester Type Waterborne Polyurethane and Modifying by Nano-Sized Particles

2012 ◽  
Vol 217-219 ◽  
pp. 656-660
Author(s):  
Yi Chen ◽  
Wen Yong Liu ◽  
Guang Sheng Zeng ◽  
Xiang Gang Li ◽  
Ling Gu
Keyword(s):  
Small Molecule ◽  
Mass Fraction ◽  
Water Resistance ◽  
Raw Materials ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Polyester Polyol ◽  
Polyurethane Film ◽  
Mechanical Characters

The waterborne polyurethane was prepared by reaction between polyester polyol and isophorone diisocyanat, different nanoparticles were filled into the system for modification. The effect of different ratio of materials, the kinds and mass of nanoparticles on the characters of waterborne polyurethane latex and film were investigated. The results showed that the stable polyurethane latex and polyurethane film with perfect characters could be prepared when the ratio of NNCO/NOH was 2.5~3.0, the DMPA with a mass fraction of 5%~6% was added into reaction as a macromolecule extender after adding small molecule chain extender BPO. Filling nanoparticles into the polyurethane latex could improve the water resistance and mechanical characters of the film. Nano-sized SiO2 was a better modifier than TiO2, and the appropriate mass fraction of SiO2 was 6% of polyurethane raw materials.

scholarly journals Synthesis and Characterization of Epoxy Resins-Modified Waterborne Polyurethane Emulsion

2021 ◽  
pp. 1-9
Author(s):  
Chenhan Zhuang ◽  
Weilan Xue ◽  
Zuoxiang Zeng
Keyword(s):  
Epoxy Resin ◽  
Water Resistance ◽  
Raw Materials ◽  
Waterborne Polyurethane ◽  
Polyurethane Film ◽  
Modification Method ◽  
Suitable Amount ◽  
Overall Performance ◽  
Better Than

Aqueous polyurethane emulsion was prepared with diphenylmethane diisocyanate (MDI), polybutylene adipate diol (PBA-1000) as main raw materials and 2, 2-dihydroxymethyl propionic acid (DMPA) as hydrophilic chain extender. On this basis, epoxy resin E-44 was introduced to modify the polyurethane prepolymer, and epoxy resin modified waterborne polyurethane emulsion was obtained. In order to obtain better performance waterborne polyurethane, the effect of DMPA content、the amount of epoxy resin added and modification method on the properties of polyurethane was discussed. The results show that when the DMPA content is 4wt%, the overall performance of the emulsion and the film is the best. And the addition of epoxy resin significantly improves the water resistance, solvent resistance and tensile strength of the waterborne polyurethane film, and its hardness and thermal stability are also improved to a certain extent. When the amount of epoxy resin added is 8wt%, the storage stability decreases significantly, the suitable amount of epoxy resin added is 6wt%. The overall performance of the film obtained by chemical modification is better than that of physical modification.

A self-colored waterborne polyurethane film with natural curcumin as a chain extender and excellent UV-Absorbing properties

Polymer ◽  
2021 ◽  
pp. 124465
Author(s):  
Tao Zhang ◽  
Yajun Deng ◽  
Wenshuo Zhang ◽  
Guannan Wang ◽  
Yuye Zhong ◽  
...  
Keyword(s):  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Polyurethane Film ◽  
A Chain

Effects of HDI/IPDI Ratio on Properties of Waterborne Polyurethane

2012 ◽  
Vol 452-453 ◽  
pp. 674-678
Author(s):  
Ming Ji Zhou ◽  
Qing Ze Jiao ◽  
Yun Zhao ◽  
Wen Jia Cui
Keyword(s):  
Raw Materials ◽  
Average Particle Size ◽  
Waterborne Polyurethane ◽  
Hexamethylene Diisocyanate ◽  
Molar Ratio ◽  
Average Particle ◽  
Isophorone Diisocyanate ◽  
Polyester Polyol ◽  
Elongation At Break ◽  
Light Blue

A waterborne polyurethane (WPU) dispersoid was synthesized through the prepolymer method using aliphatic isocyanates [namely isophorone diisocyanate(IPDI), hexamethylene diisocyanate(HDI)] and self-made polyester polyol as main raw materials. The effects of HDI/IPDI ratio on properties of waterborne polyurethane were discussed. The FTIR results confirmed the successful synthesis of WPU. As the molar ratio of HDI/IPDI increased, the properties (including elongation at break, solvent resistance, viscosity and thermal stability) increased, while the tensile strength and the average particle size decreased. The stable WPU with light blue and translucent were obtained when the HDI/ IPDI ratio was 1.5:1.

Problems of ensuring metrological traceability of measurement results of indicators of quality for food products and food raw materials

2020 ◽  
pp. 64-70
Author(s):  
Mariya Y. Medvedevskikh ◽  
Anna S. Sergeeva
Keyword(s):  
Reference Materials ◽  
Mass Fraction ◽  
Nutritional Value ◽  
Animal Feed ◽  
Raw Materials ◽  
Meat Products ◽  
Metrological Traceability ◽  
Food Products ◽  
Freeze Dried ◽  
Measurement Results

The article raises the problem of ensuring metrological traceability of the measurement results of indicators of quality and nutritional value for food products and food raw materials: water (moisture), nitrogen (protein, crude protein), fat, ash and carbohydrates. The problem under consideration can be solved by applying reference materials of food composition, traceable to state primary measurement standards GET 173-2017 and GET 176-2019 and primary reference measurement procedures (PRMP), for attestation of measurement procedures and accuracy checking of measurement results. The article discusses the results of the PRMP development of mass fraction of fat, ash and carbohydrates in food products and food raw materials, as well as mass fraction of crude fat (oil content) in oil crops seeds and products based on them. The paper also presents metrological characteristics of reference materials of composition of dry dairy products, grain-milk dry porridges for nutrition of babies, grain dry porridges for nutrition of babies, egg powder, freeze-dried meat products, animal feed. The results of the work allow for building a chain of metrological traceability from GET 173-2017, GET 176-2019 and PRMP to routine measurement procedures, thereby ensuring the uniformity of measurements of nutritional value of food products.

Effect of crystalline structure on water resistance of waterborne polyurethane

2021 ◽  
pp. 110647
Author(s):  
Zhengkai Wei ◽  
Zhimeng Liu ◽  
Xiaowei Fu ◽  
Yuechuan Wang ◽  
Anqian Yuan ◽  
...  
Keyword(s):  
Crystalline Structure ◽  
Water Resistance ◽  
Waterborne Polyurethane

Preparation of n-Alkylacrylate and Vinyl Acetate Copolymer and Its Influence on Low-Temperature Fluidity of Diesel Fuel

2011 ◽  
Vol 236-238 ◽  
pp. 708-714 ◽  
Author(s):  
Hong An ◽  
Shu Gang Gao ◽  
Shuang Li ◽  
Yan Xin Xie
Keyword(s):  
Molecular Weight ◽  
Low Temperature ◽  
Vinyl Acetate ◽  
Diesel Fuel ◽  
Mass Fraction ◽  
Raw Materials ◽  
Cold Filter Plugging Point ◽  
Point Depressant ◽  
Petrochemical Company ◽  
Acetate Copolymer

The n-tetradecylacrylate-vinyl acetate copolymer (PPV) was prepared from n-tetradecylacrylate and vinyl acetate. The PPV was employed as pour point depressant to improve the low-temperature fluidity of the -20# diesel from Daqing Petrochemical Company. The result indicated that the solidification (SP) and the cold filter plugging point (CFPP) were affected largely by PPV. And when mass fraction of PPV -14(copolymerization conditions: 80 °C,w（benzoyl peroxide）1％（total weight of raw materials）, n（vinyl acetate）∶n（n- tetradecanolacrylate） = 4∶1 ) in diesel fuel was 0.1%wt, the SP reduced by 15.0 °C, the CFPP reduced by 6.0 °C simultaneously; We analysise the different molecular weight of PPV-14, and discover that the molecular weight of PPV-14 is ralated to the the low-temperature fluidity of the -20# diesel from Daqing Petrochemical Company. When mass fraction of PPV -14(molecular weight is 15000, distribution coefficient is 3.11) in diesel fuel was 0.1% wt, the SP reduced by 18.0 °C, the CFPP reduced by 7.0 °C, simultaneously.

Serpentinite Magnesium Binders, Based on Technogenic Raw Materials

2021 ◽  
Vol 316 ◽  
pp. 1050-1054
Author(s):  
V.N. Zyryanova ◽  
E.V. Lytkina ◽  
A.P. Ochur-Ool
Keyword(s):  
Mechanical Strength ◽  
Water Resistance ◽  
Raw Materials ◽  
Raw Material ◽  
Material Base ◽  
Hardening Process ◽  
Dispersed System ◽  
Technogenic Raw Materials

Increasing water resistance and mechanical strength of hardening magnesian binders’ products can be achieved by introducing microfillings into a hardening dispersed system. It is shown that serpentine provides an increase strength and water resistance in hydration and hardening process, being as a structure-forming component, it intensifies this process. It allows expanding the raw material base for the production of magnesia binders for construction purposes.

Influence of flour from oilseed meal on sugars content in rye bread

2021 ◽  
Vol 9 (16) ◽  
pp. 57-68
Author(s):  
Halyna Voloshchuk ◽  
Keyword(s):  
Chemical Composition ◽  
Mass Fraction ◽  
Raw Materials ◽  
Sugar Content ◽  
Jerusalem Artichoke ◽  
Oilseed Meal ◽  
Rye Bread ◽  
Rye Flour ◽  
Pumpkin Seeds ◽  
The Impact

Subject of research – sugar content in rye bread with fractionally defatted flour from walnuts, pumpkin seeds, sesame and Jerusalem artichoke powder. The purpose – to investigate the chemical composition of sugars in flour from oilseed meal and to explain the impact of new raw materials upon the sugar content in bread made from rye flour. Materials and methods. For the production of pilot of bread used: rye flour; fermented rye malt; table salt; drinking water; ready liquid rye sourdough (composition: Lactobacillus plantarum 30, L .casei 26, L. fermenti 34, L .brevis and Saccharomyces minor "Chernorichenskaya", S. cerevisiae L1); fractionally defatted flour from walnuts, pumpkin seeds and sesame produced by PE "Research and Production Company "Elitfito"; Jerusalem artichoke powder "Dar". The dough was prepared in a three-phase way: liquid sourdough – saccharified choux – dough. Jerusalem artichoke powder and oilseed meal were added to the dough. The chemical composition of sugars in raw materials and bread was determined by high-performance liquid chromatography. The effect of fractionally defatted flour on the course of processes in rye dough was performed on a farinograph and amylograph of Brabender. The intensity of gas formation of the dough was determined on the device AG-1. Changes in the crystal structure of the bread crumb were performed using X-ray phase analysis on the device DRON UM-1 in the range of angles 2θ from 5 to 60 degrees. Results. It is established that the share of sugars in flour from oilseed meal is 2 ... 8 times higher than the content of sugars in rye flour. The content of sugars in fractionally defatted flour from walnuts is 43.0 %, from pumpkin seeds – 14.2 %, from sesame – 12.8% by weight of dry matter. Up to 80% of all sugars in fractionally defatted flour are sucrose and maltose. The ratio of fructose to glucose in fractionally defatted flour from walnuts is 1:1.25; from pumpkin seeds – 1:0.73; of sesame seeds – 1:0.5. The addition of 7.0 % fractionally defatted flour mixed with 3 % of the Jerusalem artichoke powder reduces the mass fraction of sugars in bread compared to the bread made with Jerusalem artichoke only. It has been studied that fractionally defatted flour from walnuts, pumpkin seeds and sesame reduces the hydrolytic decomposition of rye flour starch and promotes the process of fermentation of sugars. Scope. A mixture of fractionally defatted flour from oilseed meal in the amount of 7 % should be used for the production of bread from rye flour with 3 % Jerusalem artichoke powder to the mass fraction of flour to reduce the content of high glycemic starch sugars.

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