有机硅材料
有機硅材料
유궤규재료
SILICONE MATERIAL
2015年
4期
313-316
,共4页
郑英%张斌%罗思彬%唐丹%袁素兰
鄭英%張斌%囉思彬%唐丹%袁素蘭
정영%장빈%라사빈%당단%원소란
室温硫化%有机硅密封胶%车灯密封%反应型聚氨酯热熔胶%耐久性
室溫硫化%有機硅密封膠%車燈密封%反應型聚氨酯熱鎔膠%耐久性
실온류화%유궤규밀봉효%차등밀봉%반응형취안지열용효%내구성
RTV%silicone%sealant%vehicle lamps seal%PUR%durability
对比了实验室中高温、紫外、高低温循环条件对单组分室温硫化（RTV－1）有机硅密封胶和反应型聚氨酯热熔胶性能的影响。结果发现，标准状态下，反应型聚氨酯热熔胶的拉伸强度和拉断伸长率均大于有机硅密封胶；随着老化时间的延长，反应型聚氨酯热熔胶胶体变软，拉伸强度持续下降，120℃老化14天后的拉伸强度保持率仅60％，拉断伸长率增长了近50％，而有机硅密封胶在120℃老化14天后，拉伸强度及拉断伸长率保持率均大于90％。有机硅密封胶经过360 h的200℃高温后外观保持完整，无龟裂粉化现象；而反应型聚氨酯热熔胶经过2 h的200℃高温后表面出现大量气泡、凹坑，胶体自身被严重破坏，丧失了使用性能，并伴随着强烈的刺激性气味；经过紫外线照射2000 h后，反应型聚氨酯热熔胶表面出现明显的龟裂；有机硅密封胶外观无明显变化；有机硅的拉伸强度基本保持不变，拉断伸长率有少许下降；反应型聚氨酯热熔胶的拉伸强度有少许降低，而拉断伸长率却大大延长；经高低温循环300次后有机硅密封胶拉伸强度保持率在75％左右，胶体有少许发软，外观未出现龟裂、粉化现象；而反应型聚氨酯密封胶发生明显降解，已无法维持基本形态。 RTV－1有机硅密封胶的耐久性更优，更适合用作车灯的密封材料。
對比瞭實驗室中高溫、紫外、高低溫循環條件對單組分室溫硫化（RTV－1）有機硅密封膠和反應型聚氨酯熱鎔膠性能的影響。結果髮現，標準狀態下，反應型聚氨酯熱鎔膠的拉伸彊度和拉斷伸長率均大于有機硅密封膠；隨著老化時間的延長，反應型聚氨酯熱鎔膠膠體變軟，拉伸彊度持續下降，120℃老化14天後的拉伸彊度保持率僅60％，拉斷伸長率增長瞭近50％，而有機硅密封膠在120℃老化14天後，拉伸彊度及拉斷伸長率保持率均大于90％。有機硅密封膠經過360 h的200℃高溫後外觀保持完整，無龜裂粉化現象；而反應型聚氨酯熱鎔膠經過2 h的200℃高溫後錶麵齣現大量氣泡、凹坑，膠體自身被嚴重破壞，喪失瞭使用性能，併伴隨著彊烈的刺激性氣味；經過紫外線照射2000 h後，反應型聚氨酯熱鎔膠錶麵齣現明顯的龜裂；有機硅密封膠外觀無明顯變化；有機硅的拉伸彊度基本保持不變，拉斷伸長率有少許下降；反應型聚氨酯熱鎔膠的拉伸彊度有少許降低，而拉斷伸長率卻大大延長；經高低溫循環300次後有機硅密封膠拉伸彊度保持率在75％左右，膠體有少許髮軟，外觀未齣現龜裂、粉化現象；而反應型聚氨酯密封膠髮生明顯降解，已無法維持基本形態。 RTV－1有機硅密封膠的耐久性更優，更適閤用作車燈的密封材料。
대비료실험실중고온、자외、고저온순배조건대단조분실온류화（RTV－1）유궤규밀봉효화반응형취안지열용효성능적영향。결과발현，표준상태하，반응형취안지열용효적랍신강도화랍단신장솔균대우유궤규밀봉효；수착노화시간적연장，반응형취안지열용효효체변연，랍신강도지속하강，120℃노화14천후적랍신강도보지솔부60％，랍단신장솔증장료근50％，이유궤규밀봉효재120℃노화14천후，랍신강도급랍단신장솔보지솔균대우90％。유궤규밀봉효경과360 h적200℃고온후외관보지완정，무구렬분화현상；이반응형취안지열용효경과2 h적200℃고온후표면출현대량기포、요갱，효체자신피엄중파배，상실료사용성능，병반수착강렬적자격성기미；경과자외선조사2000 h후，반응형취안지열용효표면출현명현적구렬；유궤규밀봉효외관무명현변화；유궤규적랍신강도기본보지불변，랍단신장솔유소허하강；반응형취안지열용효적랍신강도유소허강저，이랍단신장솔각대대연장；경고저온순배300차후유궤규밀봉효랍신강도보지솔재75％좌우，효체유소허발연，외관미출현구렬、분화현상；이반응형취안지밀봉효발생명현강해，이무법유지기본형태。 RTV－1유궤규밀봉효적내구성경우，경괄합용작차등적밀봉재료。
The effects of high temperature , UV and high-low temperature on the property of RTV-1 silicone rubber and reactive polyurethane were compared .Results show that the tensile strength and elongation break of the reactive polyurethane is greater than that of the silicone rubber .As the aging time grows , the hot melt adhesive of reactive polyurethane becomes soft , its tensile strength decreases continuously .The tensile strength of polyurethane under 120℃aging for 14 days is only 60%, and its elongation break increased to 50%.Meanwhile, the tensile strength and elongation break of the silicone rubber are more than 90%under 120℃aging for 14 days.The silicone rubber’s appearance keeps complete after 200℃for 360 hours, without crack or decay.The surface of reactive pol-yurethane shows many bubbles and pits after 200℃for 2 hours.The colloid is destroyed badly , with strong pene-trating odor and cannot be used.After 2000 hours'UV radiation, the surface of polyurethane appears obvious cracks and the elongation break decreases a little , but its elongation break prolongs greatly .In the same conditions , the appearance and tensile strength of silicone rubber remains the same , but its elongation break decreases a little .Af-ter 300 times' high-low temperature recycles , the elongation break of silicone rubber is about 75%whose colloid is soft, without crack or decay.While under the same conditions, the reactive polyurethane is degradable and cannot keep its basic form.RTV-1 silicone rubber has better endurance, suitable for car’s lights sealing.
