中空玻璃丁基膠中空玻璃丁基膠即中空玻璃用丁基熱熔密封膠，是以丁基橡膠、聚異丁烯為基料，配以少量的輔料，經過高溫、捏合、真空攪拌而制成。它屬于熱塑性中空玻璃密封膠，是中空玻璃的第一道密封，其主要作用有二：一是預固定間隔框和玻璃，起粘結作用；二是保持中空玻璃的密封性（水汽的滲透或惰性氣體的泄露），延長中空玻璃的使用壽命。1

　　Hollow glass butyl rubber, also known as butyl hot melt sealant for insulating glass, is made from butyl rubber and polyisobutene as base materials, with a small amount of auxiliary materials, and is processed through high temperature, kneading, and vacuum stirring. It belongs to thermoplastic insulating glass sealant and is the first seal of insulating glass. Its main functions are twofold: first, to pre fix the spacer frame and glass, and to provide bonding; The second is to maintain the sealing of the insulating glass (due to the penetration of water vapor or leakage of inert gases), and extend the service life of the insulating glass. one

　　丁基密封膠的主要特性（1）具有永久塑性中空玻璃上墻后會因為溫度和風荷載影響發生泵吸效應。因丁基膠具備永久的塑性，故丁基膠隨著腔體內氣體的膨脹而拉伸，隨著腔體內氣體的收縮而回彈，確保中空玻璃腔體的不間斷密封。（2）與其它密封膠對比，丁基密封膠水蒸氣滲透率極低，密封性能優異。（3）剪切強度較高丁基膠對基材（玻璃、鋁及不銹鋼等）的黏合性較強，抵抗剪切滑動的能力較高，中空玻璃預壓以后可承載一定重量的大片玻璃的下片，一定時間內不易滑片或墜片。2丁基密封膠典型內溢案例丁基膠內溢不僅僅是外觀質量問題，在中空玻璃長期使用過程中，內溢處往往也是密封薄弱處。丁基膠內溢后無法完全復位，密封性能無法保證，從而導致水汽從玻璃邊部進入腔體內，造成中空玻璃失效，Low-E膜層出現氧化（圖1）。圖1　某項目中空玻璃丁基膠內溢處膜層氧化3丁基膠內溢原因分析及改善建議（1）生產因素為保證產品出廠初始外觀質量，中空玻璃生產時一般要求丁基膠壓滿鋁條不留白，不留伸縮移變空間，故丁基膠往往用量偏大和涂布偏上限，后期經過儲存、運輸、安裝，極易造成丁基膠內溢。改善建議：①常規鋁間隔條側面寬度一般為5 mm，建議生產時丁基膠涂布寬度4 mm，鋁條邊部兩邊各預留0.5 mm左右鋁條露白，確保經過中空預壓后丁基膠能完全覆蓋鋁條，不產生內溢現象。②丁基膠涂布寬度與丁基膠涂布機的溫度、氣壓、打膠速度相關。建議丁基膠涂布機擠出溫度控制在110～130 ℃，氣壓20 MPa左右，打膠速度35 m/min左右，不同的設備參數會有差異，所有的參數設置目的是為了保證合適的丁基膠用量及與基材的粘接性能。③丁基膠涂布應均勻、連續，單邊重量應為3～4 g/m為宜。④鋁間隔條角部位置是丁基膠涂布交匯處，也是最容易出現內溢的地方，需要進行適當的捏合處理，避免膠量過大。（2）儲存、運輸因素外道膠未固化即打包、玻璃堆放不合理、打包帶過緊等因素也易造成丁基膠內溢。改善建議：①玻璃生產完成后宜靜止狀態存放在玻璃架上48 h以上，待外道密封膠徹底固化后，發貨裝車前再進行包裝或打包。②木箱包裝，玻璃擺放順序應從大到小碼放，玻璃與玻璃之間應墊軟木墊隔離，軟木墊位置均勻間隔，以免局部集中受力而導致丁基膠內溢。③打包帶應固定在木箱上，不宜直接固定在玻璃上，避免打包帶單點受力將玻璃擠壓變形，造成局部丁基膠內溢。④包裝好的玻璃在運輸過程中應將玻璃架或木箱固定牢固，避免道路顛簸或剎車造成玻璃碰撞或移動。玻璃架或木箱固定時，固定繩不應壓到玻璃，以免玻璃運輸過程中局部受力，造成中空玻璃丁基膠內溢甚至間隔條變形，影響密封性能。（3）安裝因素幕墻安裝時，壓塊過緊，易造成中空玻璃在使用過程中丁基膠局部內溢。門窗玻璃安裝時，不能為了防止玻璃顫動，一味地強力夾緊玻璃，不預留物體熱脹空間，導致后期因受熱膨脹，丁基膠被擠壓變形而內溢。改善建議：①安裝時，注意玻璃壓塊、窗框扣條、密封膠條的松緊度適中。②玻璃的板面大小、厚度要通過強度、撓度進行專業計算，按照安全玻璃的設計規范設計和生產，避免因玻璃板面過大、厚度偏薄而引起的中空影像變形或玻璃顫動。（4）氣候因素①溫度因素中空玻璃在日常使用過程中，由于受環境溫度變化影響，會出現泵吸效應，中空腔內氣體會產生膨脹或收縮，在氣體膨脹或收縮時，玻璃會產生向外或向內的撓曲變形。用于內道密封的丁基膠屬于柔性材料，而鋁條屬于剛性材料，在中空玻璃不斷撓曲變形的擠壓作用下，丁基膠在腔體內側蠕動并產生剝離或內溢（圖2、圖3）。圖2　腔體膨脹圖3　腔體收縮②風荷載因素以尺寸為1.5 m×2.4 m，厚度為8 mm＋12A＋8 mm的鋼化中空玻璃為例，在50 m標高成都地區風荷載作用下，玻璃撓度計算值為7.47 mm，玻璃的形變明顯，對丁基膠產生擠壓作用，變形越大作用力越大，丁基膠內溢越明顯。③氣壓因素中空玻璃的生產地與使用地存在海拔差異，大氣壓力產生變化，中空腔內外氣壓差造成中空玻璃腔體膨脹或收縮，亦會導致丁基膠內溢。綜上，造成丁基膠內溢原因較多，生產、儲存、運輸、安裝中均要特別注意。除可控因素外，中空玻璃丁基膠由于固有的永久塑性，在高溫、高壓作用下，均會隨著玻璃的運動產生蠕動，導致在正常使用過程中緩慢發生內溢現象，是可避免的。

　　The main characteristic of butyl sealant is that (1) it has permanent plastic properties, and after being installed on the wall, it will experience pumping effect due to temperature and wind load. Due to the permanent plasticity of butyl rubber, it stretches with the expansion of gas inside the cavity and rebounds with the contraction of gas inside the cavity, ensuring uninterrupted sealing of the hollow glass cavity. (2) Compared with other sealants, butyl sealant has extremely low vapor permeability and excellent sealing performance. (3) Butyl adhesive has high shear strength and strong adhesion to substrates such as glass, aluminum, and stainless steel. It has a high ability to resist shear sliding. After preloading, insulating glass can bear a certain weight of large pieces of glass, and it is not easy to slide or fall off for a certain period of time. A typical case of internal overflow of 2-butyl sealant: Internal overflow of butyl sealant is not only a problem of appearance quality, but also a weak sealing point in the long-term use of insulated glass. After the butyl rubber overflows, it cannot be completely reset, and the sealing performance cannot be guaranteed, resulting in water vapor entering the cavity from the edge of the glass, causing the hollow glass to fail and the Low-E film layer to oxidize (Figure 1). Figure 1 Analysis and improvement suggestions for the oxidation of the film layer at the overflow of butyl rubber in a certain project's insulated glass. (1) Production factors: In order to ensure the initial appearance quality of the product before leaving the factory, it is generally required that the butyl rubber be fully pressed onto the aluminum strip during the production of insulated glass without leaving any space for expansion or contraction. Therefore, the amount of butyl rubber used is often too large and the coating limit is too high. After storage, transportation, and installation in the later stage, it is easy to cause internal overflow of butyl rubber. Improvement suggestion: ① The width of the side of the conventional aluminum spacer strip is generally 5 mm. It is recommended to apply butyl rubber with a width of 4 mm during production, and reserve about 0.5 mm on each side of the aluminum strip edge to ensure that the butyl rubber can completely cover the aluminum strip after hollow preloading without internal overflow. ② The width of butyl rubber coating is related to the temperature, air pressure, and gluing speed of the butyl rubber coating machine. It is recommended to control the extrusion temperature of the butyl rubber coating machine at 110-130 ℃, the air pressure at around 20 MPa, and the gluing speed at around 35 m/min. Different equipment parameters may vary, and the purpose of setting all parameters is to ensure the appropriate amount of butyl rubber and the adhesion performance with the substrate. ③ The application of butyl rubber should be uniform and continuous, and the weight on one side should be 3-4 g/m. ④ The corner position of the aluminum spacer strip is the intersection of butyl rubber coating, which is also the most prone to internal overflow. It needs to be properly kneaded to avoid excessive rubber volume. (2) Storage and transportation factors such as uncured outer layer glue before packaging, unreasonable stacking of glass, and tight packaging tape can also easily cause internal overflow of butyl rubber. Improvement suggestion: After the completion of glass production, it is advisable to store it in a static state on a glass rack for more than 48 hours. After the outer sealant is completely cured, it should be packaged or packed before shipment and loading. ② Wooden box packaging, glass should be placed in order from large to small, and cork pads should be placed between glass to isolate them. The cork pads should be evenly spaced to prevent local concentrated stress from causing internal overflow of butyl rubber. ③ The packing tape should be fixed on the wooden box and should not be directly fixed on the glass to avoid deformation of the glass caused by single point force on the packing tape, resulting in local overflow of butyl rubber. ④ The packaged glass should be securely fastened to the glass frame or wooden box during transportation to avoid collision or movement caused by road bumps or braking. When fixing the glass frame or wooden box, the fixing rope should not be pressed against the glass to avoid local stress during glass transportation, which may cause the butyl rubber of the insulated glass to overflow or even deform the spacer strip, affecting the sealing performance. (3) During the installation of curtain walls, if the pressure blocks are too tight, it is easy for the butyl rubber to overflow locally during the use of the insulated glass. When installing door and window glass, it is not advisable to forcefully clamp the glass without reserving space for thermal expansion in order to prevent glass vibration. This may cause the butyl rubber to be squeezed and deformed due to thermal expansion in the later stage, resulting in internal overflow. Improvement suggestion: ① During installation, pay attention to the moderate tightness of glass pressure blocks, window frame fasteners, and sealing strips. ② The size and thickness of the glass surface should be professionally calculated based on strength and deflection, and designed and produced according to the design specifications of safety glass to avoid hollow image deformation or glass vibration caused by the glass surface being too large or too thin. (4) Climate factor ① Temperature factor: During daily use, insulated glass may experience a pumping effect due to changes in environmental temperature. The gas inside the cavity will expand or contract, causing the glass to undergo outward or inward bending deformation during gas expansion or contraction. The butyl rubber used for internal sealing is a flexible material, while the aluminum strip is a rigid material. Under the continuous bending and deformation of the hollow glass, the butyl rubber crawls inside the cavity and produces peeling or overflow (Figure 2, Figure 3). Figure 2 Chamber Expansion Figure 3 Chamber Shrinkage ② Wind Load Factor Taking a tempered insulating glass with a size of 1.5 m × 2.4 m and a thickness of 8 mm+12A+8 mm as an example, under the wind load in the Chengdu area at an elevation of 50 m, the calculated deflection of the glass is 7.47 mm. The deformation of the glass is significant, and it exerts a squeezing effect on the butyl rubber. The larger the deformation, the greater the force, and the more obvious the overflow of the butyl rubber. ③ There is an altitude difference between the production and use areas of insulated glass due to air pressure factors, which causes changes in atmospheric pressure. The pressure difference between the inside and outside of the hollow cavity causes the hollow glass cavity to expand or contract, and can also lead to overflow of butyl rubber. In summary, there are many reasons for the overflow of butyl rubber, and special attention should be paid to production, storage, transportation, and installation. In addition to controllable factors, due to its inherent permanent plasticity, butyl rubber for insulating glass will undergo creep with the movement of the glass under high temperature and high pressure, resulting in slow internal overflow during normal use, which can be avoided.

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　　如何從源頭解決丁基膠內溢丁基膠內溢問題，雖屬于正常現象，但是也成為了行業痛點及投訴焦點。各原材料廠家和科研機構，為了滿足客戶不斷對高質量產品的要求，一直致力于研發新的防內溢結構丁基膠和復合材料產品。丁基膠內溢與丁基膠永久塑性相關，所以只有改變傳統丁基膠＋剛性間隔條的密封方式，才能從源頭解決丁基膠內溢的問題。熱塑性間隔密封膠（Thermo Plastic Spacer Sealant），簡稱TPSS，是以聚異丁烯、丁基橡膠和具有干燥氣體功能的材料等制成，需熱涂敷擠出成型，具有間隔支撐及干燥等功能的中空玻璃用密封材料，是一種一體化中空玻璃密封工藝，它代替了普通中空玻璃的丁基膠、剛性間隔條和分子篩（圖4）。

　　How to solve the problem of internal overflow of butyl rubber from the source, although it is a normal phenomenon, has also become a pain point and complaint focus in the industry. Various raw material manufacturers and research institutions have been committed to developing new anti overflow structural butyl rubber and composite material products to meet customers' continuous demands for high-quality products. The overflow of butyl rubber is related to the permanent plasticity of butyl rubber, so only by changing the traditional sealing method of butyl rubber+rigid spacer strip can the problem of butyl rubber overflow be solved from the source. Thermo Plastic Spacer Sealant, abbreviated as TPSS, is a sealing material for insulating glass made of polyisobutene, butyl rubber, and materials with drying gas function. It requires hot coating and extrusion molding, and has functions such as spacing support and drying. It is an integrated insulating glass sealing process that replaces the butyl rubber, rigid spacer strips, and molecular sieves of ordinary insulating glass (Figure 4).

　　間隔條結構對比熱塑性間隔密封膠按照膠體是否具有交聯特征分為非反應型間隔密封膠（TPSS-NR）和反應型間隔密封膠（TPSS-R）。非反應型間隔密封膠，膠體線性分子鏈段無交聯固化特征，與玻璃和第二道密封膠無化學粘接特性，只能與聚硫類密封膠配套使用，適用于有框中空玻璃的生產。反應型間隔密封膠，膠體分子鏈段有交聯固化特征，與玻璃和第二道密封膠有化學粘接特性，密封性更好，強度更高，彈性可恢復，適用于門窗和幕墻中空玻璃。反應型間隔密封膠（TPSS-R）與玻璃和外道密封膠形成鉸鏈反應，化學粘接，邊部形成了一個彈性整體（圖5），會隨腔體內氣體膨脹而膨脹，隨腔體內氣體收縮而收縮，從源頭避免了因泵吸效應產生的丁基膠內溢現象。圖5　彈性整體反應型間隔密封膠（TPSS-R），不存在內溢及撕裂等情況，在化學粘接的作用下，本體以及粘接面不存在漏氣通道，中空玻璃的密封性能更強、更持久，產品使用壽命為25年以上，高于中空玻璃國家標準規定的至少15年，滿足現今對于材料與建筑物同周期的追求，也是目前行業內丁基膠防內溢的有效方法之一。

　　Comparison of spacer structures: Thermoplastic spacer sealants are divided into non reactive spacer sealants (TPSS-NR) and reactive spacer sealants (TPSS-R) based on whether the gel has cross-linking characteristics. Non reactive interval sealant, colloidal linear molecular chain segments without cross-linking and curing characteristics, no chemical bonding properties with glass and second sealant, can only be used in conjunction with polysulfide sealant, suitable for the production of framed insulating glass. Reactive interval sealant, with cross-linking and curing characteristics of colloidal molecular chain segments, has chemical bonding properties with glass and second sealant, better sealing performance, higher strength, and recoverable elasticity, suitable for hollow glass in doors, windows, and curtain walls. The reactive spacer sealant (TPSS-R) forms a hinge reaction with the glass and outer sealant, chemically bonding and forming an elastic whole at the edges (Figure 5). It expands with the gas inside the cavity and contracts with the gas inside the cavity, avoiding the phenomenon of butyl rubber overflow caused by pumping effect from the source. Figure 5 Elastic integral reactive spacer sealant (TPSS-R) has no internal overflow or tearing. Under the action of chemical bonding, there is no air leakage channel on the body and bonding surface. The sealing performance of insulated glass is stronger and more durable. The product has a service life of more than 25 years, which is at least 15 years higher than the national standard for insulated glass. It meets the current pursuit of materials and buildings with the same cycle and is also one of the effective methods for preventing internal overflow of butyl rubber in the industry.

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