• Title, Summary, Keyword: silicone

Search Result 1,376, Processing Time 0.05 seconds

Status and Prospect of Test Methods of Quality Silicone Water Repellent for Protecting Reinforced Concrete

  • Sun, H.Y.;Yuan, Z.Y.;Yang, Z.;Shan, G.L.;Shen, M.X.
    • Corrosion Science and Technology
    • /
    • v.16 no.3
    • /
    • pp.141-150
    • /
    • 2017
  • Impregnating with quality silicone water repellent on the concrete surface is an effective method of protecting concrete. Quality silicone water repellent has been widely used in the engineering profession because of its desirable properties such as hydrophobicity, keeping concrete breathable and preserving the original appearance of the concrete. The companies in China that produce silicone water repellent are listed. Test methods in the specifications or standards about silicone water repellent in China are summed. The test methods relative to durability of concrete impregnated with silicone water repellent (such as resistant to chloride ion penetration, resistant to alkali, resistance to freezing and thawing and weatherability etc.) and the constructive quality (such as water absorption rate, impregnating depth and the dry velocity coefficient etc.) are compared and analyzed. The results indicate that there are differences among test methods relative to different specifications with the same index and therefore, confusion has ensued when selecting test methods. All test methods with the exception of the method of water absorption rate by using a Karsten flask are not non-destructive methods or conducted in a laboratory. Finally, further research on silicone water repellent during application is proposed.

A Study on the Resin Finishing of Silk Fabric -Silicone Resin Finishing- (견직물의 수지가공에 관한 연구)

  • 남중희;탁태문
    • Journal of Sericultural and Entomological Science
    • /
    • v.27 no.2
    • /
    • pp.28-39
    • /
    • 1985
  • The structural and useful characteristics of silk habutae treated with silicone resin by emulsion finishing method were studied. The results were obtained through crease recovery test, water repellency test, scanning micrograph observation, amino acid analysis, X-Ray diffraction analysis, and Fourier Transform Infrared Spectroscopy. The results are summarized as follows; 1) The improvement in crease recovery of silk habutae finished with silicone resin, was observed b soaping treatment and curing conditions. 2) The higher water repellency and stiffness in silk fabrics finished with silicone resin was found by the fabric inspection and the scanning electron microscopic observation. It is suggested that silicone resin impregnated into the void of silk fibroin. 3) The polar side chains of amino acid composition were decreased, when the silicone resin was treated on silk fibroin. 4) Through Amino acid analysis of silicone resin finished fibroin, the different amounts of amino acid composition was indicated due to silk fibroin silicone polymer reaction and the structural difference of its fibroin were also proved by X-ray diffractograms. 5) The functionality of the siloxane compound may be deduced from the silicone finished silk habutae by Fourier Transform Spectroscopy. It was concluded from the above results that the useful characteristics of silk fabric can be improved by silicone resin finishing.

  • PDF

Development of Cannula-typed Silicone Voice Prosthesis(So-Mang$\circledR$) (Cannula-typed Silicone Voice Prosthesis(소망$\circledR$)의 개발)

  • 최홍식;정은주;전희선;문인석;김영호;김광문
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
    • /
    • v.12 no.2
    • /
    • pp.152-157
    • /
    • 2001
  • Background : Electrolarynx, Esophageal voice, and Silicone voice prosthesis with tracheoesophageal(T-E) fistula have been used as vocal rehabilitating methods for the post-laryngectomized patients. Prosthetic rehabilitation of voice after total laryngectomy has gained wide acceptance and has become a common practice in many clinics since the pioneering works of Singer and Blom In 1979. Since the introduction of tracheo-esophageal puncture and application of Blom Singer$\circledR$ voice prosthesis in 1980, several reliable voice prostheses have been developed and are successfully being used. Objectives : Even though quality of voice produced by Silicone voice prosthesis with T-E fistula is superior to other modalities, it still has some disadvantages. We devised a new cannulatyped silicone voice prosthesis. Methods : 1) Devising a new prototype of cannula-typed silicone voice prosthesis. 2) Application of the prototype using canine animal model(laryngectormized dog) and fitting trial on human patient whose previously inserted Silicone voice prosthesis is not functioning due to presumed fungal infection. Discussion : Final form of prototype was made after several times of major and minor modifications. Insertion of the newly developed Cannula-typed Silicone voice prosthesis on canine animal model and human trial were done without any difficulty. There were no serious leakage of saliva or food during swallowing. Conclusion : The newly developed Cannula-typed Silicone voice prosthesis(So-Mang$\circledR$) and the modified replacement method will further improve the results of post-laryngectomized prosthetic voice rehabilitation. Long-term animal study and human trial are planned in the near future.

  • PDF

Physical Properties of Cotton Fabric Treated with BTCA and P olyalkyleneoxide-modified amino-functional silicone (BTCA와 실리콘 처리 면직물의 물리적 성질)

  • 남승현;유효선
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.22 no.4
    • /
    • pp.525-534
    • /
    • 1998
  • Cotton fabrics were finished with mixture of BTCA(1,2,3,4,-butanetetracarboxylic acid) and polyalkyleneoxide-modified amino-functional silicone by pad-dry-cure process to achieve better DP performance with a higher retention of physical properties as compared to those of finished with BTCA alone. The results indicated that BTCA improved the wrinkle recovery but reduced significantly the tensile and tear strength of the treated fabrics. Whereas silicone imparted a lower wrinkle recovery, a lower loss of tensile strength than BTCA, in addition improved considerably the tear strength owing to reduction in inter-fiber and/or inter-yarn frictional forces. The concentration and curing temperature needed to enhance physical properties were as follows; for BTCA treatments 6%, at 18$0^{\circ}C$, for silicone treatments 1% at 14$0^{\circ}C$. This optimum concentration of silicone was observed by using the mixture of BTCA and silicone. The wrinkle recovery and DP rating of cotton fabrics treated with mixture of 4% BTCA and 1% silicone at a curing temperature of 17$0^{\circ}C$ was similar to those of treated with 6% BTCA at a curing temperature of 18$0^{\circ}C$, and other performance properties observed were; an increase in tensile strength, extension, toughness, abrasion resistance and moisture regain due to the reduction of BTCA concentration and curing temperature, futhermore an improvement in bending and surface properties due to the lubricating effect of silicone. On the other hand 1% aqueous silicone solution showed the lowest surface tension. Such nonionic surface activity resulted in a more uniform and rapid deposition of BTCA on the fiber or fabric.

  • PDF

Evaluation of 2 Part Curtainwall Structural Silicone Sealant (커튼월용 2액형 구조용 실란트 혼합비별 물성 평가 연구)

  • Kim, Sung Hyun;Jung, Jin-young;Ahn, Myung-Su;Seo, YeonWon;Bae, Keesun
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • /
    • pp.78-80
    • /
    • 2014
  • Silicone structural glazing (SSG) is a method utilizing a silicone adhesive to attach glass, metal, or other panel material to the structure of a building. Windload and other impact loads on the facade are transferred from the glass or panel through the silicone structural sealant to the systems' framework. Silicone structural glazing systems are currently a very common method of glazing throughout the world. Locally, structural silicone glazing has become very common to achieve aesthetically pleasing and high utilization of small land for both residential and commercial building. Although structural silicone glazing has been utilized for approximately thirty years in Korea, the understanding of its technology was low and limited. Consequently, Korean projects experienced many quality issues during assembly and construction, even in very recently finished buildings. Adhesion loss and water infiltration occurred on more than one project, and the time and cost to repair these issues were substantial. In general, there are two kinds of structural silicones depending on fabrication methods. 1part structural silicone is for site glazing system and 2part structural silicone is for unitized factory glazing system. In this paper, 2part structural silicone which is very common for factory fabricating curtainwall systems was evaluated with regards to various mixing ratio. Since the structural performance of 2part sealant can be affected by mixing ratios, some extra ranges of recommended mixing ratio were evaluated to see any performance differences. Besides on cure profile, comparative evaluations for mechanical properties and adhesion develop on common building substrates were conducted.

  • PDF

Large Intraorbital Cyst after Silicone Implant Insertion: A Case Report (Silicone Implant 삽입 후에 발생한 안와내 거대 낭종)

  • Ha, Sang Wook;Lee, Hye Kyung;Yoo, Won Min;Tark, Kwan Chul
    • Archives of Plastic Surgery
    • /
    • v.33 no.5
    • /
    • pp.659-662
    • /
    • 2006
  • Purpose: Alloplastic implants, such as methylmethacrylate, Teflon, silicone, Supramid are commonly used to cover the floor defect and to prevent reherniation of the displaced orbital tissue in orbital floor fracture. Silicone implant has been used for reconstruction of orbital wall defects because of pliability, advantage of carving and chemically inert nature. However, silicone implant also has complications including infection, extrusion, pain, dystopia and tissue reaction. Cyst formation around the silicone implant is a very rare complication. According to many reports, cysts around alloplastic implant in an orbital area are mostly hemorrhagic cysts consisted of blood breakdown product with fibrous capsule cell in histologic examination. Methods: The authors report atypical case and successful treatment of intraorbital hemorrhagic cyst around silicone implant of a 37-year-old male patient. Results: Preoperative symptoms of diplopia, exophthalmos, proptosis, vertical dystopia and ectropion of lower eyelid were resolved after surgical removal of implants with surrounding capsule. Conclusion: Clinical suspicion of plastic surgeon is important in diagnosis of intraorbital cyst of patients who have history of silicone implantation and computed tomography is the standard tool of diagnosis. During the operation, caution must be taken on delivering the whole capsule of intraorbital cyst along with silicone implant to prevent recurrence of the cyst.

Storage Effectiveness of Deep-Fried Potato Chip Prepared with Canola Oil Fortified with TBHQ and Silicone (Potato Chip 제조시 TBHQ 와 Silicone 첨가유에 의한 저장 연장 효과)

  • Jung, Byoung-Doo;Rhee, Soon-Jae
    • Korean Journal of Food Science and Technology
    • /
    • v.29 no.4
    • /
    • pp.635-640
    • /
    • 1997
  • The oxidative stability of the potato chip prepared with canola oil fortified with antioxidnats was studied to explore the possibility of substituting it for imported frying fats and oils. BHT, BHA, TBHQ and silicone were added to the oil at a level of 0.02% and 10 ppm, respectively. Potato chip samples were prepared in a commercial scale and stored at $25.0{\pm}0.5^{\circ}C$ for 5 months. The oxidative stability of the extracted oils from potato chips during storage was estimated on the basis of some their physico-chemical changes, such as acid values, peroxide values, iodine values, ansidine values, fatty acid composition of the oils. An organoleptic test for the flavor of the samples was also performed. The oxidative stability of the samlpes was estimated on the basis of the changes of the parameter values. The effectiveness of the antioxidants was in the order of canola oil+TBHQ (0.02%)+silicone (10 ppm) > canola oil+TBHQ (0.02%) > canola oil+BHA (0.02%)+silicone (10 ppm) > canola oil+BHT (0.02%)+silicone (10 ppm) > canola oil+BHA (0.02%) > canola oil+BHT (0.02%) > canola oil. The antioxidant effect of canola oil+TBHQ (0.02%)+silicone (10 ppm) was more salient than any other antioxidant used in the potato chip.

  • PDF

Surface Characterization of Silicone Rubbers by Corona Discharge (코로나 방전처리에 따른 실리콘 고무의 표면특성 변화)

  • Hong, Joo-Il;Seo, Yu-Jin;Lee, Ki-Taek;Hwang, Sun-Mook;Huh, Chang-Su
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.503-506
    • /
    • 2004
  • In this paper we investigated the changes of surface hydrophobic characteristics on silicone rubbers by corona discharge treatment and also investigated the distribution and the behavior of low molecular weight(LMW) silicone fluid which was extracted by solvent-extraction with gel permeation chromatography(GPC). It was shown that contact angle was $110.5^{\circ}$ on initial sample but contact angle was approximately decreased to $10^{\circ}$ after 45 minutes. However the surface hydrophobic characteristic on silicone rubbers which were removed from corona discharge was recovered within 5 hours. It was shown that corona discharge insured the increase of diffusible LMW chains, which could lead to recover the surface hydrophobicity. The surface hydrophobic characteristics on silicone rubbers and the recovery mechanism based on our results were discussed.

  • PDF

The Analysis of HVDC Cable Oil Swelling Characteristics on the Silicone Rubber (HVDC 절연유 중에서 Silicone Rubber의 팽윤특성 분석)

  • Lee, T.H.;Kim, N.Y.;Kim, J.N.;Jeon, S.I.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.623-624
    • /
    • 2007
  • This work examines the effects of swelling MI type HVDC cable oil on the semiconductive silicone rubber and silicone rubber as used in accessories for application on outdoor termination (EBA) slip on sleeve. The behavior of volume resistivity is monitored as a function of the amount of cable oil diffused into the material. Resistivities of semiconductive silicone samples up to the typical insulator range (${\sim}10^{10}{\Omega}-cm$) are observed as a consequence of swelling due to the presence of the diffused oil. The measured volume resistivities of the oil-impregnated semiconductive silicone rubber are compared to desired value as function of stress relief cone.

  • PDF

Comparison of Wound Healing Between Conventional Tie-over Dressing and Silicone Sheeting after Skin Grafting (피부이식술 후 고식적 봉합붕대법과 실리콘판법의 임상적 고찰)

  • Park, Hyun-Chul;Park, Hyun-Sik;Ahn, Sang-Cheon;Cho, Sang-Hyun;Kim, Sang-Soo;Chang, Jin
    • Archives of Reconstructive Microsurgery
    • /
    • v.20 no.1
    • /
    • pp.26-31
    • /
    • 2011
  • Purpose: We compared wound healing between the conventional tie-over dressing and silicone sheeting after skin grafting in patients with skin defects. Materials and Methods: Of a total of 30 cases of skin defects, 15 underwent conventional tie-over dressing and the remaining 15 underwent silicone sheeting skin grafting, we compared hematoma formation and infection status between the 2 techniques 1 and 2 weeks after operation Results: Hematoma was not observed in all cases. The wound infection rate decreased in silicone group. Conclusions: Silicone sheeting skin graft may be helpful in reducing wound infection.

  • PDF