Study on the Durability of Fluorinated Water and Oil Repellent Finishing by Contact Angle Method

2012 ◽  
Vol 482-484 ◽  
pp. 1294-1297
Author(s):  
Dian Wei Zhang ◽  
Yong Zhu Cui ◽  
Yan Ling Sui
Keyword(s):  
Contact Angle ◽  
Curing Temperature ◽  
Cross Linking ◽  
Optimum Process ◽  
Curing Time ◽  
Repellent Property ◽  
Finishing Agent ◽  
Oil Repellent ◽  
Angle Method

In this paper, fluorinated water and oil repellent finishing agent was mixed with auxiliary agents and the durability of fabrics treated with the finishing agent was investigated. The water and oil repellent property was discussed and evaluated by contact angle method. The results showed that under the same conditions, adding 0.4% cross-linking agent could make the contact angle of the treated fabric higher than untreated, and the durable-washing property of the fabric was excellent and the durability of fluorinated water and oil repellent finishing agent got improved greatly. The optimum process was that the dosage of water and oil repellent finishing agent was 50g/L, the dosage of cross-linking agent was 4g/L, curing temperature was 160 °C and curing time was 90s.

The Durability of Water and Oil Repellent Finishing of Cotton Fabrics with Isocyanate

2013 ◽  
Vol 634-638 ◽  
pp. 2579-2582
Author(s):  
Dian Wei Zhang ◽  
Yong Zhu Cui ◽  
Wang Xiao ◽  
Guo Jun Liu
Keyword(s):  
Contact Angle ◽  
Cotton Fabrics ◽  
Curing Temperature ◽  
Cross Linking ◽  
Curing Time ◽  
Finishing Agent ◽  
Oil Repellent ◽  
Organic Fluorine

The cotton fabrics was treated with the blending of organic fluorine water and oil repellent finishing agent and cross-linking agent. The contact angle to water was over 120°and that to oil was above 110°after the fabrics were washed 20 times, indicating that the water and oil repellent properties and durability of fabrics were excellent. And the technology was optimized as follows: the water and oil repellent finishing agent 50g/L, cross-linking agent 4g/L, curing temperature 150°C and curing time 200s.

Moisture Absorption Finishing of Polyester Fabric

2013 ◽  
Vol 275-277 ◽  
pp. 2182-2185
Author(s):  
Jun Zhang
Keyword(s):  
Moisture Absorption ◽  
Process Condition ◽  
Polyester Fabric ◽  
Curing Temperature ◽  
Optimum Process ◽  
Curing Time ◽  
Drying Time ◽  
Moisture Management ◽  
Finishing Agent

Polyester fabric was finished by water-absorbent and quick-dry agent Casofter-252 and moisture management agent Hipom-790 for improving its moisture management property. The quality of moisture absorption finishing of the polyester fabric was detected in terms of wicking height and fast drying time. And the influence of agent concentration, pH, and curing temperature and time on moisture management property was studied in order to obtain the optimum process condition. The best choice for Casofter-252 was agent concentration 20g/L, pH 3, curing temperature 135 oC, curing time 120s, and the optimum finishing condition for Hipom-790 was as follows: agent concentration 30g/L, pH 5, curing at 115 oC for 140 s. The finished polyester fabric under the optimum condition showed much better air permeability. The tensile strength of the fabric increased after moisture finishing with Hipom-790 while it decreased for Casofter-252 used as a finishing agent.

MECHANICAL PROPERTIES AND CURE TEST OF A NATURAL RUBBER/POLY(VINYL ALCOHOL) BLEND

2012 ◽  
Vol 85 (1) ◽  
pp. 147-156 ◽  
Author(s):  
Sa-Ad Riyajan ◽  
Suwit Chaiponban ◽  
Sasitorn Chusri ◽  
Supayang Piyawan Voravuthikunchai
Keyword(s):  
Tensile Strength ◽  
Antibacterial Activity ◽  
Natural Rubber ◽  
Polymer Blend ◽  
Maleic Acid ◽  
Acid Content ◽  
Attenuated Total Reflection ◽  
Curing Temperature ◽  
Cross Linking ◽  
Curing Time

Abstract Properties and antibacterial activity of polymer blend films prepared from polyvinyl alcohol (PVA) and natural rubber (NR) blends, in the presence of maleic acid as a cross-linking agent were studied. The effect of the maleic acid content, curing temperature, and curing time on the properties of the polymer blend was investigated. Cross-linking between PVA and maleic acid was observed by attenuated total reflection mode–Fourier transform infrared spectroscopy at 1152 cm−1. The swelling ratio of the polymer blend decreased as a function of the increase of the maleic acid content. The tensile strength of the polymer blend increased with an increase of both the maleic acid and the curing time. The highest tensile strength of the samples was observed with 40% w/w maleic acid after a 24 h curing time at 120 °C. The elongation at the break of 60/40 NR/PVA was ∼500% at 120 °C for 1 h. In addition, the polymer blend showed good antibacterial activity with Staphylococcus aureus ATCC25923, Escherichia coli ATCC25922, and Acinetobacter baumannii JVC 1053 and could find many applications.

Study on Preparation of Titanium Dioxide from Low Iron and Rich Titanium Slag with Acid Hydrolysis Technical

2012 ◽  
Vol 554-556 ◽  
pp. 682-686
Author(s):  
Zhi Yong Hu
Keyword(s):  
Titanium Dioxide ◽  
Sulfuric Acid ◽  
Acid Hydrolysis ◽  
Process Parameters ◽  
Sulfuric Acid Concentration ◽  
Curing Temperature ◽  
Hydrolysis Rate ◽  
Optimum Process ◽  
Curing Time ◽  
Titanium Slag

Titanium dioxide is an important inorganic chemical product, and low iron and rich titanium slag can be made into titanium dioxide. In this paper, process parameters for preparing titanium dioxide were investigated. The results show that with the increase of sulfuric acid concentration, curing time and curing temperature, the rate of sulfuric acid hydrolysis rate will be improved, as well as charging temperature. According to the orthogonal test, the optimum process parameters condition of sulfuric acid is 95% sulfuric acid, 180°C reaction temperature, and 120min curing time.

scholarly journals Synthesis of Geopolymer from Inorganic Construction Waste

2013 ◽  
Vol 30 ◽  
pp. 45-51 ◽  
Author(s):  
Arbind Pathak ◽  
Vinay Kumar Jha
Keyword(s):  
Compressive Strength ◽  
Coal Fly Ash ◽  
Chemical Society ◽  
Raw Material ◽  
Curing Temperature ◽  
Alkali Concentration ◽  
Curing Time ◽  
Mass Ratio ◽  
Construction Waste ◽  
Alumino Silicate

Recently, the demolition of old houses and the construction of new buildings in Kathmandu valley are in the peak which in turn generates a huge amount of construction waste. There are two major types of construction wastes which are burden for disposal namely cement-sand-waste (CSW) and the coal fly ash (CFA). These construction wastes are rich source of alumino-silicate and thus used as raw material for the synthesis of geopolymer in this study. Geopolymers have been synthesized from CSW and CFA using NaOH-KOH and Na2SiO3 as activators. Some parameters like alkali concentration, amount of Na2SiO3 and curing time have been varied in order to improve the quality of geopolymeric product. The geopolymerization process has been carried out using 3-8M KOH/NaOH solutions, Na2SiO3 to CFA and CSW mass ratio of 0.25-2.00 and curing time variation from 5-28 days. The curing temperature was fixed at 40ºC in all the cases. 6M NaOH and 7M KOH solutions were found appropriate alkali concentrations while the ratio of sodium silicate to CSW and CFA of 0.5 and 1.75 respectively were found suitable mass ratio for the process of geopolymer synthesis. The maximum compressive strength of only 7.3 MPa after 15 days curing time with CSW raw material was achieved while with CFA, the compressive strength was found to be 41.9 MPa with increasing the curing time up to 28 days.DOI: http://dx.doi.org/10.3126/jncs.v30i0.9334Journal of Nepal Chemical Society Vol. 30, 2012 Page:  45-51 Uploaded date: 12/16/2013    

Fast and simple fabrication of SiO2/poly(vinylidene fluoride) coated cotton fabrics with asymmetric wettability via a facile spray-coating route

2018 ◽  
Vol 89 (6) ◽  
pp. 1013-1026 ◽  
Author(s):  
Rongrong Yu ◽  
Mingwei Tian ◽  
Lijun Qu ◽  
Shifeng Zhu ◽  
Jianhua Ran ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Vinylidene Fluoride ◽  
Spray Coating ◽  
Cotton Fabrics ◽  
Water Repellent ◽  
Water Contact ◽  
Repellent Property ◽  
Poly Vinylidene Fluoride

Cotton fabrics with hydrophilic-to-hydrophobic asymmetric surfaces are attractive as potential utilizable structures for functional garments. The spray-coating route could be deemed as a fast and simple way to achieve asymmetric surfaces. In this paper, SiO2 nanoparticles with size ∼ 205 nm were synthesized via the modified sol-gel method, and then modified with poly(vinylidene fluoride) (PVDF) to form a hydrophobic surface. The SiO2 nanoparticles modified with PVDF were uniformly deposited on the outer surface of cotton fabric aided with the robust air flow force from the sprayer. The morphology and chemical structures were characterized by scanning electron microscopy, mapping, atomic force microscopy, X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy. The results indicated that SiO2 nanoparticles were evenly deposited on the surface of cotton fibers and stable interfacial interaction occurred between SiO2 and PVDF molecular chains. The existence of SiO2 could increase the roughness of the fabric surface, which could enhance the water-repellent property of the coated fabrics. Furthermore, the water-repellent property and thermal insulation properties were evaluated via the water contact angle and thermal conductivity tests, respectively, and the results showed that 20 wt.% SiO2/PVDF fabric achieved a desirable level of contact angle, 136.6°, which was the largest water contact angle among all the samples, and the lowest thermal conductivity of 0.033 W/mK, resulting from the existence of SiO2 nanoparticles. Such a fast and simple spray-coating strategy could be widely introduced into asymmetric fabric modification, and such asymmetric fabrics with reasonable water-repellent and thermal insulating outer surfaces could act as candidates in the field of functional garments.

Curing Time and Water Repellent Properties of Dammar-Titanium Dioxide Thin Film

2015 ◽  
Vol 1112 ◽  
pp. 359-362
Author(s):  
Aisyah Nor Hasnan ◽  
Azizah Hanom Ahmad
Keyword(s):  
Contact Angle ◽  
Titanium Dioxide ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Repellent ◽  
Coating System ◽  
Curing Time ◽  
Coating Surface ◽  
Natural Resin ◽  
Before And After

Dammar plant resin is a local natural resin that can be bled from Dipterocaupacea sp of tree. It can be found abundantly in Malaysia’s tropical forest especially in Sarawak. Dammar and Titanium Dioxide was mixed in a various wt% to produce Dammar-modified Titanium Dioxide coating system. The modified coating systems were then spin-coated onto Aluminium Q-panel as the substrate. Coated Q-panels were left to cure at room temperature. The curing time was evaluated using dust free stage. The addition of Titanium Dioxide into the coating system fastens the curing time taken for the coated Q-panel to be cure. It only took about 11-12 minutes to dry compared to the coating system before the addition of Titanium Dioxide where a quite long duration required, 32 minutes. Contact angle measurement was also carried out in order to determine the wettability of the coating system. The surface coated with dammar-modified titanium dioxide found to be hydrophobic where a quite large contact angle obtained for the sample with 3 wt% of Titanium Dioxide (PDT3). The water droplets actually rest on the coating surface without wetting the surface. Water absorption test was done to strengthen the contact angle results where coated substrate was soaked into distilled water for 24 hours and being weighed before and after soaking. The difference of before and after soaking weigh showed that the coating surface does not absorb that much water where only approximately 0.02% of water being absorbed by the coating system for 3 wt%. It proved that the coating systems applied are hydrophobic.

Study on Hydrophilic Modification of Acrylic Yarn

2014 ◽  
Vol 1061-1062 ◽  
pp. 287-290
Author(s):  
Yin Wang ◽  
Zheng Qin Liu ◽  
Kai Qiang Liu ◽  
Cui Ping Zhang ◽  
Qiu Mei Wang
Keyword(s):  
Moisture Absorption ◽  
Cyano Group ◽  
Fiber Surface ◽  
Cross Linking ◽  
Optimum Process ◽  
Hydrolysis Time ◽  
Experimental Conditions ◽  
Hydrophilic Modification ◽  
Orthogonal Experiments ◽  
Naoh Solution

In order to improve the moisture absorption of the acrylic yarn, the acrylic yarn was firstly hydrolyzed in the caustic soda (NaOH) solution to convert the cyano group molecular into hydrophilic group, then the reticulated coatings was formed on fiber surface by chemical crosslink. Furthermore, the effect of the acrylic hydrolysis temperature, NaOH dosage, ethanol, cross-linking agent (CLA) on acrylic affinity for moisture was discussed through the contrast experiments. The best experimental conditions were investigated by the orthogonal experiments, and the optimum process parameters were obtained. The results indicate that under the condition of NaOH concentration of 6%, hydrolysis time of 15 min, temperature of 80°C, and cross-linking agent concentration of 0.09% on weight the yarn (owf), the moisture regain of modified acrylic yarn has increased by 245.4% as compared with that of untreated acrylic yarn and the water absorption has been improved greatly.

Effect of Adhesive Thickness on the Impact Toughness of Butt-Joints

2011 ◽  
Vol 230-232 ◽  
pp. 1350-1354 ◽  
Author(s):  
Min You ◽  
Jing Rong Hu ◽  
Xiao Ling Zheng ◽  
Ai Ping He ◽  
Cun Jun Chen
Keyword(s):  
Impact Toughness ◽  
Adhesive Layer ◽  
Curing Temperature ◽  
Curing Time ◽  
Optimum Thickness ◽  
Adhesively Bonded ◽  
Butt Joints ◽  
Notched Specimen ◽  
Adhesive Thickness ◽  
The Impact

The effect of the adhesive thickness on the impact toughness of the adhesively bonded steel joint under impact loading is studied using the experimental method. The results obtained show that the impact toughness increases when the adhesive thickness increased then it decrease as the adhesive thickness increase. When the curing time is set as a constant, the higher the curing temperature is, the lower the impact toughness of the joint. The optimum thickness of the adhesive layer for the specimen of impact toughness test cured at 60 C for 1 h is 0.6 mm and it is 0.4 mm to 0.6 mm for the specimen cured 1 h at temperature of 90 C or higher than it. It is recommended using the notched specimen to decrease the testing deviation.

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