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PVA1788的用量對單組分聚氨酯密封膠的黏度和干強(qiáng)度的影響
- 發(fā)布時間 : 2026-7-6 16:53:43
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(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.
PVA1788的用量對單組分聚氨酯密封膠的黏度和干強(qiáng)度的影響
(Summary description)Customized SILICONE STRUCTURAL SEALANT from China manufacturer refers to the adhesive with high strength, can bear large load, aging resistance, fatigue resistance and corrosion resistance, and has stable performance within the expected life. It is suitable for bearing the bonding of strong structural parts. Non structural adhesive has low strength and poor durability. It can only be used for bonding, sealing and fixing of ordinary and temporary properties, and cannot be used for structural adhesive bonding. NEUTRAL SILICONE WETHERPROOF SEALANT from China manufacturer is a structural adhesive with waterproof function. Silicone glue refers to the adhesive based on silicone rubber. According to different functions, it can be divided into structural adhesive, potting adhesive, sealant, thermal conductive adhesive, flame retardant adhesive and so on.
- 發(fā)布時間 : 2026-7-6 16:53:43
- Views:
Information
改變PVA1788的質(zhì)量分?jǐn)?shù)(10%、12%、14%、15%)，使用和上文同樣的配比調(diào)配單組分聚氨酯密封膠，考察PVA1788的用量對單組分聚氨酯密封膠的黏度和干強(qiáng)度的影響，結(jié)果如圖2和圖3所示。由圖2可以看出，當(dāng)PVA1788的質(zhì)量分?jǐn)?shù)由10%增加至15%時，單組分聚氨酯密封膠的黏度一時間曲線越來越陡，反映了體系中固化速率加快，開放期縮短。這是由于PVA質(zhì)量分?jǐn)?shù)增加，輕基質(zhì)量分?jǐn)?shù)隨之升高，與異氰酸酷的反應(yīng)速率加快，單組分聚氨酯密封膠黏度增加。當(dāng)PVA1788的質(zhì)量分?jǐn)?shù)為10%-14%時，單組分聚氨酯密封膠的開放期達(dá)到120min，繼續(xù)增加PVA1788的質(zhì)量分?jǐn)?shù)至15%，開放期急劇下降至30minx。拉伸剪切強(qiáng)度是AP工單組分聚氨酯密封膠的另一個評價指標(biāo)。由圖可知，隨靜置時間延長，質(zhì)量分?jǐn)?shù)為12%和14%的PVA1788制備單組分聚氨酯密封膠的干剪切強(qiáng)度均呈現(xiàn)先上升后下降的趨勢。這是由于初始階段單組分聚氨酯密封膠的黏度較低，施膠及加壓時容易造成膠液損失，對試樣的干強(qiáng)度不利。隨著主劑和助劑混合時間的延長，單組分聚氨酯密封膠黏度增加，留在粘接面的有效單組分聚氨酯密封膠增加，因此干強(qiáng)度隨靜置時間的延長而增加。但隨著時間推移，固化劑被不斷消耗，制備試件時參與橋接膠層和木材表面的固化劑的有效用量逐漸減少，因此后期干強(qiáng)度反而下降。質(zhì)量分?jǐn)?shù)為12%的PVA1788配制單組分聚氨酯密封膠在30-90min內(nèi)的干強(qiáng)度均大于10MPa，超過90min,粘接強(qiáng)度低于10MPa。質(zhì)量分?jǐn)?shù)為14%的PVA1788配制單組分聚氨酯密封膠在120min內(nèi)的干強(qiáng)度均大于10MPa，符合國標(biāo)要求。綜合開放期和干強(qiáng)度，確定最佳的PVA1788質(zhì)量分?jǐn)?shù)為14%。(2)PM200固化劑的用量對單組分聚氨酯密封膠干強(qiáng)度的影響。圖是不同用量的PM200固化劑配制單組分聚氨酯密封膠的干強(qiáng)度隨時間的變化圖。由圖可知當(dāng)PM200用量為12%和13%時，干強(qiáng)度隨時間延長均呈現(xiàn)先增加后降低的趨勢。其中，PM200用量為13%單組分聚氨酯密封膠的干強(qiáng)度在靜置時間為60min時達(dá)到最大值12.5MPa，在靜置時間為120min時，干強(qiáng)度仍大于10MPa，高于國際標(biāo)準(zhǔn)要求。當(dāng)PM200用量為14%和15%時，雖然初期干強(qiáng)度略有提高，但靜置后逐漸下降。這是由于當(dāng)交聯(lián)劑用量過多時，使用期單組分聚氨酯密封膠黏度會迅速增加，單組分聚氨酯密封膠的流動性和浸潤性減弱，交聯(lián)劑與木材界面的化學(xué)反應(yīng)也減少，導(dǎo)致強(qiáng)度下降。因此，最佳的PM200用量為13%。http://www.mychangxin.com/
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