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.

Microstructures and Mechanical Properties of Three-Dimensional Braided Carbon Fiber Reinforced Mullite Composites with Different Sols as Raw Materials

2015 ◽  
Vol 816 ◽  
pp. 27-32 ◽  
Author(s):  
Song Lin Liang ◽  
Qing Song Ma ◽  
Hai Tao Liu
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Carbon Fiber ◽  
Raw Materials ◽  
Three Dimensional ◽  
Solid Content ◽  
Fiber Reinforced ◽  
Ceramic Yield ◽  
Carbon Fiber Reinforced ◽  
Microstructures And Mechanical Properties

In order to efficiently fabricate dense three-dimensional carbon fiber reinforced mullite matrix composites (3D C/mullite), two kinds of Al2O3-SiO2sols with high solid content were used as raw materials. The ceramic yield and mullitization behavior of the sols and the densification process were investigated. It is indicated that the two sols have proper solid content and ceramic yield and can be completely transformed into mullite at 1573K, which make them be able to prepare composites. 3D C/mullite composites with a porosity of ∼25% were prepared by repeating less than 20 cycles of infiltration-drying-heating of sols, and the microstructures and mechanical properties were examined. The results suggest that the sol with smaller particle size derived composites exhibit well-sintered dense matrix and physically stronger interfacial bonding, which are beneficial to improve load-bearing and load-transferring capacity of matrix. As a result, this composites show much higher mechanical properties. The flexural strength and modulus are 2.4 times and 1.3 times as those of the sol with larger particle size derived composites, respectively.

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.

Effect of Slurry Formulation on Morphology and Flowability of Spray-Dried Alumina/Zirconia Composite Particles

2016 ◽  
Vol 675-676 ◽  
pp. 531-534 ◽  
Author(s):  
Saowaluk Chiangka ◽  
Sukasem Watcharamaisakul ◽  
Boris Golman
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Biomedical Applications ◽  
Solid Content ◽  
Composite Particles ◽  
Round Shape ◽  
Compressibility Index ◽  
Tap Density ◽  
Binder Type ◽  
Spray Dried

Alumina/zirconia composite materials are widely used for biomedical applications because of their high biocompatibility and good mechanical properties. In this work, the effects of slurry solid content and binder type are studied on the characteristics of spray-dried composite particles. The tap density and particle size of composite particles increase while the compressibility index decreases with increasing solid content of slurry. An analysis of the SEM micrographs of spray-dried particles confirms the formation of dense composite particles of round shape without internal holes with 70 wt.% slurry using PVA+PEG co-binder.

scholarly journals Experimental Analysis of the Mechanical Properties and Resistivity of Tectonic Coal Samples with Different Particle Sizes

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2303
Author(s):  
Congyu Zhong ◽  
Liwen Cao ◽  
Jishi Geng ◽  
Zhihao Jiang ◽  
Shuai Zhang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Uniaxial Compressive Strength ◽  
Coalbed Methane ◽  
Coal Sample ◽  
Fine Particles ◽  
Particle Sizes ◽  
Tectonic Coal

Because of its weak cementation and abundant pores and cracks, it is difficult to obtain suitable samples of tectonic coal to test its mechanical properties. Therefore, the research and development of coalbed methane drilling and mining technology are restricted. In this study, tectonic coal samples are remodeled with different particle sizes to test the mechanical parameters and loading resistivity. The research results show that the particle size and gradation of tectonic coal significantly impact its uniaxial compressive strength and elastic modulus and affect changes in resistivity. As the converted particle size increases, the uniaxial compressive strength and elastic modulus decrease first and then tend to remain unchanged. The strength of the single-particle gradation coal sample decreases from 0.867 to 0.433 MPa and the elastic modulus decreases from 59.28 to 41.63 MPa with increasing particle size. The change in resistivity of the coal sample increases with increasing particle size, and the degree of resistivity variation decreases during the coal sample failure stage. In composite-particle gradation, the proportion of fine particles in the tectonic coal sample increases from 33% to 80%. Its strength and elastic modulus increase from 0.996 to 1.31 MPa and 83.96 to 125.4 MPa, respectively, and the resistivity change degree decreases. The proportion of medium particles or coarse particles increases, and the sample strength, elastic modulus, and resistivity changes all decrease.

scholarly journals Influences of B4C content and particle size on the mechanical properties of hot pressed TiB2–B4C composites

2021 ◽  
pp. 1-9
Author(s):  
Jun Zhao ◽  
Qinggui Li ◽  
Weixiao Cao ◽  
Zetan Liu ◽  
Xiangong Deng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size

Effects of maximum particle size of coarse aggregates and steel fiber contents on the mechanical properties and impact resistance of recycled aggregate concrete

2021 ◽  
pp. 136943322110179
Author(s):  
DongTao Xia ◽  
ShaoJun Xie ◽  
Min Fu ◽  
Feng Zhu
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Steel Fiber ◽  
Impact Resistance ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Coarse Aggregates ◽  
Maximum Particle Size ◽  
Maximum Particle

Fiber reinforced recycled aggregate concrete has become a new type of green concrete material. The maximum particle size of coarse aggregates and steel fiber contents affect the mechanical properties and impact resistance of recycled aggregate concrete. However, such studies are rare in literature. The present paper shortens the gap through experimental study. A total of 144 specimens of 12 kinds of concrete mixtures were tested, which adopted different steel fiber volume admixtures (0%, 0.8%, 1.0%, 1.2%) and recycled coarse aggregates in different maximum particle sizes (9.5, 19, 31.5 mm) replacing 30% natural coarse aggregate. The compressive strength, splitting tensile strength, and impact resistance of the 12 concrete mixtures were tested. The results showed that the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete increased first and then decreased with the increase of the maximum particle size. The recycled aggregate concrete with the maximum particle size of 19 mm had the highest mechanical properties and impact resistance. Besides, with the increase of steel fiber content, the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete showed an increasing trend. Considering a large amount of experimental data and the coupling effect of steel fiber contents and the maximum particle size of coarse aggregates, the Weibull distribution function was introduced to analyze the impact test results and predict the number of resistance to impact under different failure probabilities. The results showed that the number of blows of the recycled aggregate concrete followed a two-parameter Weibull distribution, and the estimated value of the number of resistance to impact for failure increased with the increase of the failure probability.

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