A transparent polyurethane based on nanosilica in reinforcing papers

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Shanshan Jin ◽  
Yingping Qi ◽  
Yongfeng Shen ◽  
Hua Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Life Expectancy ◽  
Mass Concentration ◽  
Alkali Resistance ◽  
Written Information ◽  
Folding Endurance ◽  
Paper Fibers ◽  
Tearing Strength

AbstractPaper has been the most significant carrier of written information for many centuries. To prolong the life expectancy of papers, the polyurethane based on nanosilica was used to strengthen the paper fibers in this work. The relation between the mass concentration of polyurethane based on nanosilica and the specific properties of papers (e. g., folding endurance, tensile strength, tearing strength, whiteness and glossiness) were investigated. In addition, the effect of polyurethane based on nanosilica on the acid/alkali resistance and ageing resistance were studied. The results showed that polyurethane based on nanosilica could significantly improve the mechanical properties and ageing resistance of papers.

Study on Surface Sizing of Cationic Polyacrylate Emulsion to Improve Mechanical Properties of Paper

2012 ◽  
Vol 200 ◽  
pp. 287-291 ◽  
Author(s):  
Quan Xiao Liu ◽  
Wen Cai Xu ◽  
Yan Na Yin
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Positive Charge ◽  
Solid Content ◽  
Drying Methods ◽  
Machine Direction ◽  
Surface Sizing ◽  
Emulsion Layer ◽  
Folding Endurance ◽  
Tearing Strength

Cationic polyacrylate emulsion was used as surface sizing agent and the effects of emulsion properties on paper mechanical properties were studied. The mechanical properties of sized paper gradually increased with the increase of solid content, viscosity and positive charge density of emulsion and decreased with the increase of particle size of emulsion. Tensile strength, folding endurance and tearing strength on machine direction were increased 33.62%, 11.99%, 6.79% respectively when the paper with single emulsion layer was used oven drying methods.

Affection of Manufacture Parameters and Mixture Material on Plastic Alloy Bearings

2012 ◽  
Vol 164 ◽  
pp. 37-41
Author(s):  
Cheng Yun Yang ◽  
Jin Min Peng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Process Parameters ◽  
Peel Strength ◽  
Manufacture Process ◽  
Orthogonal Experiments ◽  
And Performance ◽  
Orthogonal Tests ◽  
Tearing Strength ◽  
Optimal Formula

Manufacture process parameters will be obtained from experiments in research. Molding technology determines the mechanical properties and performance of the product. The influence of molding temperature and time are significant on the performance of water lubricated bearing, the plastic alloy is based on latex material, synthesized with different fillings, accelerators and other matters, and displays great mechanical and friction properties. The main performance included peel strength, tensile strength and wearing capacity. Optimization of manufacture process parameters and the orthogonal experiments on them were carried out by integrating the results of experiments and finally the optimal manufacture process was achieved. In the experiment, three-leveled orthogonal tests were conducted for the three systems to test the tensile strength, tearing strength, stress at definite elongation, hardness and tensile rate. The impacts of the respective systems were analyzed and the content of each component are determined to get the optimal formula.

Mechanical Properties and Corrosion Mechanism of GFRP Rebar in Alkaline Solution

2015 ◽  
Vol 665 ◽  
pp. 217-220
Author(s):  
Ji Ze Mao ◽  
Hong Wei Zhang ◽  
Jian Fu Lv ◽  
Dao Guang Jia ◽  
Shi Kai Ao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Alkaline Solution ◽  
Concrete Structure ◽  
Ph Value ◽  
Unsaturated Polyester ◽  
Alkali Resistance ◽  
Resin Matrix ◽  
Corrosion Mechanism ◽  
Mechanical Properties And Corrosion

Steel corrosion is one of the main problems of concrete structure durability. Compared with the steel, GFRP rebar has the advantages of high strength, low density and good corrosion resistance. Therefore, GFRP becomes a good choice to replace steel bar in concrete structure. Since GFRP material is susceptible to the alkaline conditions, it is necessary to clarify the mechanical properties and corrosion mechanism of GFRP rebar in such an alkaline environment of interior concrete. In this study, the artificial accelerated corrosion tests of two kinds of GFRP rebar (epoxy and unsaturated polyester resin matrix) were conducted at 60 °C in alkaline solution up to 90 days. Then the tensile strength tests of GFRP rebar were carried out. The solution PH values, the tensile strength and mass loss of GFRP rebar were measured. The testing results show that the mass of GFRP rebar had rarely changed, but the tensile strength reduced about 30% after 90-day immersion test in alkaline solution. During the test, the PH value of the alkaline solution decreased from 13.62 to around 12.85, which indicated that the hydroxyl ions of the alkaline solution had been consumed. The ester bonds in resin matrix may hydrolyze in alkaline solution and the bonding interface between fiber and resin can be damaged progressively. It can cause the performance degradation of GFRP rebar. In addition, the relationship between the loss of tensile strength and the reduction of PH can be determined. That means the durability of GFRP rebar in concrete can be enhanced by controlling or limiting the alkalinity when producing concrete. Finally, the GFRP rebar of epoxy resin matrix shows higher retention values of tensile strength and better alkali resistance than those of UPR matrix rebar after 90d immersion in the alkaline solution. The obtained results in this paper can provide application reference of GFRP materials in civil engineering.

Effect of Blending with Additives on Mechanical Properties of PVC Architectural Membrane Material

2011 ◽  
Vol 687 ◽  
pp. 617-620 ◽  
Author(s):  
Yu Gang Meng ◽  
Rui Ting Huo ◽  
Chun Zhi Qi ◽  
Ling Yu Chang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Mechanical Characteristics ◽  
Peel Strength ◽  
Pvc Membrane ◽  
Membrane Material ◽  
Chlorinated Polyethylene ◽  
Coated Fabric ◽  
Tearing Strength ◽  
Trimethoxy Silane

Polyvinyl chloride (PVC) architectural membrane material is a species of composite textile material. In comparison with other architectural membrane materials such as PTFE or ETFE, PVC membrane material is much cheaper, softer and easier construction feasibility. In this paper, g-methacryloxypropyl trimethoxy silane (KH-570), chlorinated polyethylene (CPE) and pellet binder (PB) were added into PVC paste, respectively. The mechanical properties (tensile strength, peel strength and tearing strength) of the coated fabric were investigated. It was found that the mechanical characteristics of PVC coated fabric were evidently affected by the addition of KH-570 in the coating paste. Both tensile strength and peel strength of PVC coated fabric were improved by the addition of KH-570. The addition of CPE into the coating paste had little effect on the mechanical properties of the coated fabric. The mechanical properties of the coated fabric were greatly improved by blending with PB, the peel strength enhanced 157% and the tensile strength increased 150N/50mm, but the tearing strength was largely reduced.

Flexibility Modification of KGM Membranes by Maleic Anhydride

2009 ◽  
Vol 620-622 ◽  
pp. 627-630 ◽  
Author(s):  
Yan Chen ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Maleic Anhydride ◽  
Processing Parameters ◽  
Konjac Glucomannan ◽  
Optimum Conditions ◽  
Orthogonal Experiments ◽  
Folding Endurance ◽  
Effects Of Ph

Konjac Glucomannan (KGM) was modified by maleic anhydride (MA). The influences of processing parameters on the mechanical properties of KGM films were investigated through orthogonal experiments. The results showed that the effects of pH, temperature and time of KGM swelling on tensile strength and folding endurance of modified KGM membranes were insignificant (F<F0.05). The quantity of MA affected slightly on the tensile strength (F<F0.05), but its effect on the folding endurance was significant (F>F0.01). Folding endurance and tensile strength of KGM membranes could be improved by proper addition of MA. The optimum conditions of KGM modification were that the mixture of KGM and MA was swelling at pH 4.0 and 60°C for 2 h, and then cast on a flat and dried at 50°C to give modified KGM membranes.

A Study on the Modification of Water Lubrication Bearing Materials

2011 ◽  
Vol 287-290 ◽  
pp. 1481-1485
Author(s):  
Jin Min Peng ◽  
Min Feng Luo
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Water Lubrication ◽  
Special Choice ◽  
American Military ◽  
Bearing Materials ◽  
Orthogonal Tests ◽  
Tearing Strength ◽  
Optimal Formula

Water lubricated bearings differ from water lubricated bearings in its special choice of material. A novelty material developed with an aim to improve the lubricating performance and bearing capacity, water lubricated bearings BTG plastic alloy is based on latex material, synthesized with different fillings, accelerators and other matters, and displays great mechanical and friction properties. In order to expand its application to the field of water lubrication, a bettered formula was adopted from the aspects of vulcanization, reinforced filling and softened plastification systems to improve its mechanical property. In the experiment, three-leveled orthogonal tests were conducted for the three systems to test the tensile strength, tearing strength, stress at definite elongation, hardness and tensile rate. The impacts of the respective systems were analyzed and the content of each component are determined to get the optimal formula. The modified bearings enjoy some mechanical properties that live up to or even exceed American military standards MIL-B-17901(Vessel).

Synthesis and Properties of Phenyl Silicone Resin Reinforced Addition Type Liquid Phenyl Silicone Rubber

2018 ◽  
Vol 926 ◽  
pp. 39-44 ◽  
Author(s):  
Dan Peng ◽  
Qiu Hong Mu ◽  
Shuo Zhang ◽  
Jin Hui Li ◽  
Feng Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Radiation Dose ◽  
Thermal Degradation ◽  
Silicone Rubber ◽  
Resin Content ◽  
Silicone Resin ◽  
Elongation At Break ◽  
Before And After ◽  
Tearing Strength

Phenyl silicone resin reinforced addition type liquid phenyl silicone rubber was prepared by vulcanization of vinyl end-capped polymethylphenylsiloxane (PVPS), phenyl MT resins and hydrogen end-capped polydiphenylsiloxane (PHPS) under Pt catalysis at 150°C for 4h. The effects of the proportion and the vinyl content of phenyl MT resins on the mechanical properties of cured products were investigated. The thermal stability was explored by thermogravimetric analysis. The changes of mechanical properties were also studied before and after irradiation. Phenyl silicone rubber with good performance was obtained when the phenyl MT resin content was 50~60 wt% and the vinyl content was at 5.5~6.6 wt%. The onset temperature of thermal degradation and the center temperature of thermal degradation were 443.7°C and 502°C, respectively. When the radiation dose increased from 0 to 300 KGy, the tensile strength decreased from 4.1MPa to 2.3MPa and the tearing strength decreased from 8.9MPa to 5.1MPa. When the radiation dose continues to increased from 300 to 900 KGy, the tensile strength increased from 2.3MPa to 6.4MPa and the tearing strength increased from 5.1MPa to 6.5MPa. During the process of radiation, the elongation at break had been kept down from 96% to 52%, and the hardness increased from 80A to 90A.

Effects of Needle-Punch Depth on Properties of PET/LPET/Kevlar Nonwoven Geotextiles

2014 ◽  
Vol 910 ◽  
pp. 266-269 ◽  
Author(s):  
Jia Horng Lin ◽  
Jing Chzi Hsieh ◽  
Jia Hsun Li ◽  
Wen Hao Hsing ◽  
Ching Wen Lou
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Melting Point ◽  
Geotechnical Engineering ◽  
Engineering Applications ◽  
Puncture Resistance ◽  
Bursting Strength ◽  
Nonwoven Fabrics ◽  
Pet Fibers ◽  
Tearing Strength

Geotextile has been commonly used in civil and geotechnical engineering applications, and the majority of geotextiles is made of nonwoven fabrics. Therefore, this study combines crimped polyester (PET) fibers, recycled Kevlar unidirectional selvage fibers, and low-melting-point PET (LPET) fibers to form PET/Kevlar/LPET nonwoven geotextiles, and then examines how various neelde-punch depths influence mechanical properties of the resulting nonwoven geotextiles. The tensile strength, tearing strength, bursting strength, and static puncture resistance of the nonwoven fabrics increase as a result of an increase of 0.3 cm to 0.5 cm in needle-punch depth. However, an increase of 0.5 cm to 0.7 cm causes a slight decrease in all aforementioned properties.

Dry-Process Hardboards from Recycled Newsprint Paper Fibers

1992 ◽  
Vol 266 ◽  
Author(s):  
Andrzej M. Krzysik ◽  
John A. Youngquist ◽  
James M. Muehl ◽  
Roger M. Rowell ◽  
Poo Chow ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Mechanical Strength ◽  
Water Resistance ◽  
Wood Fiber ◽  
Strength Properties ◽  
Dry Process ◽  
Paper Fibers

AbstractDry-process hardboard represents a favorable option for recycling old newspaper fibers. However, dry-process boards tend to be less dimensionally stable than boards processed by other methods. Our objective was to determine the effects of various wood fiber (WF) to old newspaper (ONP) ratios (100:0, 50:50, and 0:100 WF/ONP) on the mechanical strength and water resistance of dry-process hardboards made from these fibers. Untreated and acetylated hardboards were made with 3 or 7 percent resin and 0.5 percent wax. Boards were tested for static bending and tensile strength properties and water resistance. As expected, increasing the resin level from 3 to 7 percent generally improved all measured properties. Acetylation substantially improved the water resistance of all boards; increasing the amount of ONP caused a corresponding deterioration in both mechanical properties and water resistance.

Manufacturing Technique and Property Evaluation of Cotton/Polyester/ Rubber Composite Warp Knit

2012 ◽  
Vol 627 ◽  
pp. 302-306
Author(s):  
Jia Horng Lin ◽  
Shih Yu Huang ◽  
Hui Yu Yang ◽  
Ching Wen Lin ◽  
Jin Mao Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Fibers ◽  
Air Permeability ◽  
Cotton Yarn ◽  
Knitted Fabrics ◽  
Synthetic Fibers ◽  
Property Evaluation ◽  
Rubber Composite ◽  
Tearing Strength

Cotton fiber is a type of natural fibers. Using natural fibers to fabricate textile can not only decrease the consumption of synthetic fibers, but also reduce the environmental pollution. This study aims to fabricate elastic knitted fabrics and evaluate their properties. Polyester (PET) filaments and rubber threads serve as the warp while cotton yarn serves as the weft for warp knitting. A crochet machine makes the warp and weft into warp knits with desirable stretchability, during which the amount (single/double) and the ply number (1-, 2-, and 3-ply) of the weft are further varied. The resulting warp knits are evaluated for water absorption, air permeability, and mechanical properties. As demonstrated by the experimental results, the warp knits with single 1-ply weft (S1) yield an optimal air permeability of 224.6 cm3/cm2/s and stiffness along the warp direction of 4.74cm. The warp knits with single 2-ply weft (S2) display an optimal tearing strength of 86N while the warp knits with double 3-ply weft (D3/3) has an optimal tensile strength of 708N.

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