水性聚氨酯、水性聚氨酯生產(chǎn)基地、水性聚氨酯廠家、水性PU樹(shù)脂、水性聚氨酯樹(shù)脂、紡織整理劑、紡織樹(shù)脂涂層
水性聚氨酯
水性聚氨酯樹(shù)脂
水性PU樹(shù)脂
浙江水性聚氨酯
江蘇水性聚氨酯
水性聚氨酯廠家
水性膠粘劑
水性聚氨酯涂層
水性聚氨酯廠商
汽車內(nèi)飾膠
彈簧植絨膠
水性襯布漿料
水性紡織涂層
紡織整理劑
水性增稠劑
水性固化劑
水性證卡膠
煙包轉(zhuǎn)移膠
防彈衣膠水
尼龍布水性膠
硅油面料膠水
弗硅面料膠水
汽車外衣涂層樹(shù)脂
戶外帳篷涂層樹(shù)脂
沖鋒衣涂層樹(shù)脂
水性PU乳液
水性PU膠水
水性PU膠粘劑
水性PU分散體
水性指甲油
皮革涂層
玻璃涂層
水性復(fù)合膠
蒂合型增稠劑
水分散固化劑
水性油墨樹(shù)脂
水性涂料
水性木器漆
汽車門板內(nèi)飾膠
水性墻紙膠粘劑
高檔墻紙涂層
窗簾復(fù)合膠
柯橋窗簾復(fù)合膠
水性樹(shù)脂
水性地坪漆
水性地坪漆固化劑
UD無(wú)緯布膠水
水性鞋膠
皮革復(fù)合水性膠
PU革復(fù)合水性膠
塑料復(fù)合水性膠
靜電植絨水性膠粘劑
PET層壓油
PET層壓水性膠粘劑
江蘇證卡膠
常州證卡膠
無(wú)錫證卡膠
浙證卡膠
江蘇PVC證卡膠水
常州PVC證卡膠水
無(wú)錫PVC證卡膠水
浙江PVC證卡膠水
水性環(huán)保膠
南通襯布漿料
南通襯布漿料廠家
江蘇襯布漿料
江蘇襯布漿料廠家
常熟襯布漿料
常熟襯布漿料廠家
無(wú)錫襯布漿料
無(wú)錫襯布漿料廠家
上海襯布漿料
上海襯布漿料廠家
蘇州襯布漿料
蘇州襯布漿料廠家
常州襯布漿料
常州襯布漿料廠家
汽車彈簧植絨膠水
汽車彈簧植絨膠粘劑
水性塑膠漆
水性玻璃漆
水性金屬漆
汽車水性地盤漆
水性傳動(dòng)軸漆
陶瓷漆
盛澤涂層膠
盛澤膠粘劑
盛澤紡織涂層膠
盛澤紡織膠粘劑
吳江紡織涂層膠
吳江紡織膠粘劑
嘉興紡織涂層膠
嘉興紡織膠粘劑
盛澤水性膠粘劑
吳江水性膠粘劑
嘉興水性膠粘劑
紡織印花膠漿
尼龍印花膠漿
皮革印花膠漿
高彈性水性印花膠漿
織物整理劑
防腐涂料廠家
真空吸塑膠
水性真空吸塑膠
PVC復(fù)合膠
PVC墻紙復(fù)合膠
PVC革復(fù)合膠
汽車可剝離外衣膠
汽車不可剝離外衣膠
水性立體厚板漿
體育場(chǎng)水性涂料
學(xué)校跑道塑膠專用水性聚氨酯
廠房地水性坪漆
廠房環(huán)保地坪漆
幼兒園水性環(huán)保漆
幼兒園專用水性漆
帽襯樹(shù)脂
帽襯樹(shù)脂廠家
水性涂料
水性木器漆
水性漆
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推薦資訊
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行業(yè)動(dòng)態(tài)
隨著國(guó)家生活水平的提高，近些年對(duì)環(huán)保的嚴(yán)格重視，環(huán)保型膠粘劑的研發(fā)日益受重視。環(huán)保型膠粘劑除了要求對(duì)材料的粘接具有牢固性、持久性和柔軟性之外，還必須要具環(huán)保性，并對(duì)不同材質(zhì)具兼容性，以確保成品的質(zhì)量。
With the improvement of the living standard of the country, strict attention has been paid to environmental protection in recent years. In addition to requiring firmness, durability and softness, the environment-friendly adhesives must also be environmentally friendly and compatible with different materials, so as to ensure the quality of finished products.
水性聚氨酯膠粘劑與無(wú)溶劑型聚氨酯膠粘劑為環(huán)保型膠粘劑最主要的兩種類型，此外，環(huán)保型膠粘劑還包括乳狀/分散膠粘劑、反應(yīng)型膠粘劑以及天然聚合體膠粘劑等類型。
Waterborne polyurethane adhesives and solventless polyurethane adhesives are two main types of environment-friendly adhesives. In addition, environment-friendly adhesives also include emulsion / dispersion adhesive, reactive adhesives and natural polymer adhesives.
無(wú)溶劑型聚氨酯膠粘劑一般稱作熱熔型聚氨酯膠粘劑，其100%由熱塑性樹(shù)脂組成，不含任何水分或溶劑，在熔融狀態(tài)下可以流動(dòng)，并在冷卻后具有粘結(jié)性能，可方便用于自動(dòng)化生產(chǎn)過(guò)程，生產(chǎn)效率高，而且不產(chǎn)生任何環(huán)境污染，不對(duì)人類造成毒害。
Solvent free polyurethane adhesive is generally called hot-melt polyurethane adhesive, the 100% is made of a thermoplastic resin composition, does not contain any water or solvent, can flow in the molten state, and has the bonding properties after cooling, it can be easily used in the production process automation, high production efficiency, and no environmental pollution, human right harm.
由于普通接觸型熱熔膠對(duì)被粘材質(zhì)表面浸潤(rùn)性差，已被證實(shí)不能普遍適用于外底的粘合，因此，人們開(kāi)始對(duì)反應(yīng)型熱熔膠粘劑進(jìn)行開(kāi)發(fā)研究，經(jīng)過(guò)近幾年的努力，現(xiàn)在已開(kāi)發(fā)出低黏度且在適宜溫度條件下能夠應(yīng)用的產(chǎn)品。反應(yīng)型熱熔膠借助水份或熱作用進(jìn)行交聯(lián)，從而達(dá)到較好的粘合強(qiáng)度。使用無(wú)溶劑反應(yīng)型聚氨酯熱熔膠要配套專門涂膠設(shè)備，且操作工藝條件較嚴(yán)格，因此，推廣應(yīng)用有一定的難度。
Because of the common contact type hot melt adhesive for sticking material surface wettability is poor, has been confirmed not adhesive, generally applicable to the outsole so people started the research and development of reactive hot melt adhesive, after several years of efforts, now has developed a low viscosity and can be applied at suitable temperature conditions product. Reactive hot melt adhesive is crosslinked with water or heat, so as to achieve better bonding strength. The use of solventless reactive polyurethane hot melt adhesive must be equipped with special coating equipment, and the operation conditions are strict. Therefore, it is difficult to popularize the application.
水性聚氨酯膠粘劑不含異氰酸酯基團(tuán)，而含有羧基、羥基等基團(tuán)，在適宜條件下，例如在水性異氰酸酯存在時(shí)，可使膠粘劑的分子產(chǎn)生交聯(lián)反應(yīng)。大多數(shù)水性聚氨酯膠粘劑是靠分子內(nèi)極性基團(tuán)產(chǎn)生的內(nèi)聚力和粘附力進(jìn)行固化的。水性聚氨酯具有極性基團(tuán)，如氨酯鍵、脲鍵以及離子鍵等，因此，對(duì)許多合成材料，尤其是極性材料、多孔性材料均具有良好的粘接性。
Waterborne polyurethane adhesives do not contain isocyanate groups, but contain carboxyl and hydroxyl groups. Under suitable conditions, for example, when waterborne isocyanates exist, crosslinking reaction of adhesives can be made. Most of the waterborne polyurethane adhesives are cured by the cohesive force and adhesion force produced by the intramolecular polar groups. Waterborne polyurethane has polar groups, such as urethane bonds, urea bonds and ionic bonds. Therefore, it has good adhesion to many synthetic materials, especially polar materials and porous materials.
與溶劑型聚氨酯膠粘劑相比，水性聚氨酯膠粘劑沒(méi)有溶劑刺鼻味、無(wú)毒、無(wú)污染，且具有操作方便、殘膠易清理、固體含量高以及貯運(yùn)安全方便等優(yōu)點(diǎn)，但水性聚氨酯膠粘劑的干燥時(shí)間較慢，干燥溫度較高，且干燥工藝條件的要求也極為嚴(yán)格，以保證水份能夠揮發(fā)徹底。水性聚氨酯膠粘劑對(duì)基材的潤(rùn)濕能力差，且膠粘劑中的水溶性高分子增稠劑會(huì)使其耐水性降低，此外，目前尚未開(kāi)發(fā)出配套使用的水性表面處理劑（處于實(shí)驗(yàn)室研究階段），仍需使用溶劑型表面處理劑，因此，即使使用水性聚氨酯膠粘劑，目前仍不能做到完全根除有機(jī)溶劑。
Compared with the solvent based polyurethane adhesive, waterborne polyurethane adhesive without solvent odor, non-toxic, no pollution, and has the advantages of convenient operation, easy cleaning, solid residue and high content of safe storage and transportation is convenient, but the longer drying time of waterborne polyurethane adhesive, high temperature drying, drying conditions and requirements are very strict in order to ensure the water can volatilize completely. The wetting ability of waterborne polyurethane adhesive to the substrate, and the adhesive of water soluble polymer thickener will make its water resistance is reduced, in addition, has not yet developed a water surface treatment agent for supporting the use of (at the stage of laboratory research), still need to use solvent surface treatment agent, therefore, even if the use of water polyurethane adhesive, still do not completely eradicate the organic solvent.
水性聚氨酯膠粘劑的研究始于20世紀(jì)50年代，真正受到人們所重視則是在60—70年代，但當(dāng)時(shí)的水性聚氨酯膠粘劑粘合強(qiáng)度不高，多用于包裝用膠及一些低粘合強(qiáng)度的場(chǎng)合。70年代中期開(kāi)始出現(xiàn)用于粘合鞋底的水性聚氨酯膠粘劑，因性能欠佳，再加上環(huán)保法規(guī)不嚴(yán)格，到80年代末，基本上仍處于試驗(yàn)階段。90年代初，歐美各國(guó)環(huán)保法規(guī)日趨嚴(yán)厲，對(duì)鞋廠的VOC量開(kāi)始控制，水性聚氨酯分散體合成和應(yīng)用工藝的研究力度得到了加強(qiáng)，水性聚氨酯膠粘劑的性能上基本上可以滿足制鞋的要求。
The research of waterborne polyurethane adhesives began in 1950s. The real attention was from 60 to 70s, but the adhesive strength of waterborne polyurethane adhesives was not high at that time, and it was mostly used for packaging adhesives and some occasions with low adhesion strength. In the middle of 70s, waterborne polyurethane adhesives for soles were developed. Due to poor performance and environmental regulations, they were still at the experimental stage by the end of 80s. In the early 90s, the environmental regulations in Europe and the United States became more and more severe. The quantity of VOC in shoe factories began to control. The research and application of waterborne polyurethane dispersions were strengthened. The performance of waterborne polyurethane adhesives basically met the requirements of shoemaking.
介紹了這么多，水性聚氨酯膠粘劑的制備方法都有哪些呢？接下來(lái)就一起來(lái)簡(jiǎn)單了解一下吧！
The preparation methods of waterborne polyurethane adhesives are divided into external emulsification and self emulsification. In comparison, the emulsion prepared by emulsion, due to residual hydrophilic small molecular emulsifier, the properties of cured polyurethane film received certain effect, but the self emulsifying law can eliminate this drawback, therefore, the preparation of waterborne polyurethane with the ionic self emulsification method.
自乳化法，主要分為預(yù)聚體法、丙酮法及熔融分散法三種。
The self emulsifying method is mainly divided into three kinds: prepolymer method, acetone method and melt dispersing method.
一、預(yù)聚體法
Prepolymer method
預(yù)聚體法即在預(yù)聚體中導(dǎo)人親水成分，從而得到一定粘度范圍的預(yù)聚體，在水中發(fā)生乳化的同時(shí)進(jìn)行鏈增長(zhǎng)，最終制得穩(wěn)定的水性聚氨酯膠粘劑（水性聚氨酯—脲）。恒天的專家提醒，此法僅適用于脂肪族或脂環(huán)族聚氨酯水分散體的合成，而價(jià)格低且性能優(yōu)良的芳香族端異氰酸酯預(yù)聚體與水的反應(yīng)則較快，因此在水中胺擴(kuò)鏈的效果較差。
The prepolymer method that dimer active hydrophilic component in the pre, to obtain a certain viscosity range of prepolymer in water emulsion and waterborne polyurethane adhesive chain growth, eventually obtained stable (aqueous polyurethane urea). Experts from hengtian chemical industry remind that this method is only suitable for the synthesis of aliphatic or alicyclic polyurethane aqueous dispersions, while the aromatic isocyanate prepolymer with low price and excellent performance is faster than water, so the effect of amine chain extension in water is poor.
二、丙酮法
Two, acetone method
丙酮法屬于溶液法，是以有機(jī)溶劑稀釋或溶解聚氨酯（或預(yù)聚體），再進(jìn)行乳化的方法。在溶劑存在的情況下，預(yù)聚體與親水性擴(kuò)鏈劑進(jìn)行擴(kuò)鏈反應(yīng)，生成分子量較高的聚氨酯，反應(yīng)過(guò)程中可根據(jù)需要加人適量溶劑以降低聚氨酯溶液的粘度，使之易于攪拌，之后加水進(jìn)行分散，使之形成乳液，最后蒸去溶劑。溶劑以丙酮、甲乙酮居多，故稱為丙酮法。
Acetone method is a solution method, which is an organic solvent to dilute or dissolve polyurethane (or prepolymer) and then emulsify. In the presence of a solvent, prepolymer chain reaction and hydrophilic chain extender, polyurethane forming high molecular weight, the reaction process can be adding solvent to reduce the viscosity of polyurethane solution, making it easy to stir after water were dispersed to form emulsion, finally evaporating solvent. The solvent is acetone and methyl ethyl ketone, so it is called acetone method.
丙酮法和預(yù)聚體法的主要區(qū)別是，在丙酮法中，聚氨酯先預(yù)聚成分子量較大的預(yù)聚體，但由于分子量越大的預(yù)聚體粘度也越大，因此必須加入適量溶劑進(jìn)行稀釋以降
The main difference between acetone method and prepolymer method is that polyurethane can be prepolymerized into a larger molecular weight prepolymer in acetone process. However, because the viscosity of prepolymer with larger molecular weight is bigger, it is necessary to add appropriate solvent to dilute it.
With the improvement of the living standard of the country, strict attention has been paid to environmental protection in recent years. In addition to requiring firmness, durability and softness, the environment-friendly adhesives must also be environmentally friendly and compatible with different materials, so as to ensure the quality of finished products.
水性聚氨酯膠粘劑與無(wú)溶劑型聚氨酯膠粘劑為環(huán)保型膠粘劑最主要的兩種類型，此外，環(huán)保型膠粘劑還包括乳狀/分散膠粘劑、反應(yīng)型膠粘劑以及天然聚合體膠粘劑等類型。
Waterborne polyurethane adhesives and solventless polyurethane adhesives are two main types of environment-friendly adhesives. In addition, environment-friendly adhesives also include emulsion / dispersion adhesive, reactive adhesives and natural polymer adhesives.
無(wú)溶劑型聚氨酯膠粘劑一般稱作熱熔型聚氨酯膠粘劑，其100%由熱塑性樹(shù)脂組成，不含任何水分或溶劑，在熔融狀態(tài)下可以流動(dòng)，并在冷卻后具有粘結(jié)性能，可方便用于自動(dòng)化生產(chǎn)過(guò)程，生產(chǎn)效率高，而且不產(chǎn)生任何環(huán)境污染，不對(duì)人類造成毒害。
Solvent free polyurethane adhesive is generally called hot-melt polyurethane adhesive, the 100% is made of a thermoplastic resin composition, does not contain any water or solvent, can flow in the molten state, and has the bonding properties after cooling, it can be easily used in the production process automation, high production efficiency, and no environmental pollution, human right harm.
由于普通接觸型熱熔膠對(duì)被粘材質(zhì)表面浸潤(rùn)性差，已被證實(shí)不能普遍適用于外底的粘合，因此，人們開(kāi)始對(duì)反應(yīng)型熱熔膠粘劑進(jìn)行開(kāi)發(fā)研究，經(jīng)過(guò)近幾年的努力，現(xiàn)在已開(kāi)發(fā)出低黏度且在適宜溫度條件下能夠應(yīng)用的產(chǎn)品。反應(yīng)型熱熔膠借助水份或熱作用進(jìn)行交聯(lián)，從而達(dá)到較好的粘合強(qiáng)度。使用無(wú)溶劑反應(yīng)型聚氨酯熱熔膠要配套專門涂膠設(shè)備，且操作工藝條件較嚴(yán)格，因此，推廣應(yīng)用有一定的難度。
Because of the common contact type hot melt adhesive for sticking material surface wettability is poor, has been confirmed not adhesive, generally applicable to the outsole so people started the research and development of reactive hot melt adhesive, after several years of efforts, now has developed a low viscosity and can be applied at suitable temperature conditions product. Reactive hot melt adhesive is crosslinked with water or heat, so as to achieve better bonding strength. The use of solventless reactive polyurethane hot melt adhesive must be equipped with special coating equipment, and the operation conditions are strict. Therefore, it is difficult to popularize the application.
水性聚氨酯膠粘劑不含異氰酸酯基團(tuán)，而含有羧基、羥基等基團(tuán)，在適宜條件下，例如在水性異氰酸酯存在時(shí)，可使膠粘劑的分子產(chǎn)生交聯(lián)反應(yīng)。大多數(shù)水性聚氨酯膠粘劑是靠分子內(nèi)極性基團(tuán)產(chǎn)生的內(nèi)聚力和粘附力進(jìn)行固化的。水性聚氨酯具有極性基團(tuán)，如氨酯鍵、脲鍵以及離子鍵等，因此，對(duì)許多合成材料，尤其是極性材料、多孔性材料均具有良好的粘接性。
Waterborne polyurethane adhesives do not contain isocyanate groups, but contain carboxyl and hydroxyl groups. Under suitable conditions, for example, when waterborne isocyanates exist, crosslinking reaction of adhesives can be made. Most of the waterborne polyurethane adhesives are cured by the cohesive force and adhesion force produced by the intramolecular polar groups. Waterborne polyurethane has polar groups, such as urethane bonds, urea bonds and ionic bonds. Therefore, it has good adhesion to many synthetic materials, especially polar materials and porous materials.
與溶劑型聚氨酯膠粘劑相比，水性聚氨酯膠粘劑沒(méi)有溶劑刺鼻味、無(wú)毒、無(wú)污染，且具有操作方便、殘膠易清理、固體含量高以及貯運(yùn)安全方便等優(yōu)點(diǎn)，但水性聚氨酯膠粘劑的干燥時(shí)間較慢，干燥溫度較高，且干燥工藝條件的要求也極為嚴(yán)格，以保證水份能夠揮發(fā)徹底。水性聚氨酯膠粘劑對(duì)基材的潤(rùn)濕能力差，且膠粘劑中的水溶性高分子增稠劑會(huì)使其耐水性降低，此外，目前尚未開(kāi)發(fā)出配套使用的水性表面處理劑（處于實(shí)驗(yàn)室研究階段），仍需使用溶劑型表面處理劑，因此，即使使用水性聚氨酯膠粘劑，目前仍不能做到完全根除有機(jī)溶劑。
Compared with the solvent based polyurethane adhesive, waterborne polyurethane adhesive without solvent odor, non-toxic, no pollution, and has the advantages of convenient operation, easy cleaning, solid residue and high content of safe storage and transportation is convenient, but the longer drying time of waterborne polyurethane adhesive, high temperature drying, drying conditions and requirements are very strict in order to ensure the water can volatilize completely. The wetting ability of waterborne polyurethane adhesive to the substrate, and the adhesive of water soluble polymer thickener will make its water resistance is reduced, in addition, has not yet developed a water surface treatment agent for supporting the use of (at the stage of laboratory research), still need to use solvent surface treatment agent, therefore, even if the use of water polyurethane adhesive, still do not completely eradicate the organic solvent.
水性聚氨酯膠粘劑的研究始于20世紀(jì)50年代，真正受到人們所重視則是在60—70年代，但當(dāng)時(shí)的水性聚氨酯膠粘劑粘合強(qiáng)度不高，多用于包裝用膠及一些低粘合強(qiáng)度的場(chǎng)合。70年代中期開(kāi)始出現(xiàn)用于粘合鞋底的水性聚氨酯膠粘劑，因性能欠佳，再加上環(huán)保法規(guī)不嚴(yán)格，到80年代末，基本上仍處于試驗(yàn)階段。90年代初，歐美各國(guó)環(huán)保法規(guī)日趨嚴(yán)厲，對(duì)鞋廠的VOC量開(kāi)始控制，水性聚氨酯分散體合成和應(yīng)用工藝的研究力度得到了加強(qiáng)，水性聚氨酯膠粘劑的性能上基本上可以滿足制鞋的要求。
The research of waterborne polyurethane adhesives began in 1950s. The real attention was from 60 to 70s, but the adhesive strength of waterborne polyurethane adhesives was not high at that time, and it was mostly used for packaging adhesives and some occasions with low adhesion strength. In the middle of 70s, waterborne polyurethane adhesives for soles were developed. Due to poor performance and environmental regulations, they were still at the experimental stage by the end of 80s. In the early 90s, the environmental regulations in Europe and the United States became more and more severe. The quantity of VOC in shoe factories began to control. The research and application of waterborne polyurethane dispersions were strengthened. The performance of waterborne polyurethane adhesives basically met the requirements of shoemaking.
介紹了這么多，水性聚氨酯膠粘劑的制備方法都有哪些呢？接下來(lái)就一起來(lái)簡(jiǎn)單了解一下吧！
What are the preparation methods of waterborne polyurethane adhesives? Let's just get to know it.
The preparation methods of waterborne polyurethane adhesives are divided into external emulsification and self emulsification. In comparison, the emulsion prepared by emulsion, due to residual hydrophilic small molecular emulsifier, the properties of cured polyurethane film received certain effect, but the self emulsifying law can eliminate this drawback, therefore, the preparation of waterborne polyurethane with the ionic self emulsification method.
自乳化法，主要分為預(yù)聚體法、丙酮法及熔融分散法三種。
The self emulsifying method is mainly divided into three kinds: prepolymer method, acetone method and melt dispersing method.
一、預(yù)聚體法
Prepolymer method
預(yù)聚體法即在預(yù)聚體中導(dǎo)人親水成分，從而得到一定粘度范圍的預(yù)聚體，在水中發(fā)生乳化的同時(shí)進(jìn)行鏈增長(zhǎng)，最終制得穩(wěn)定的水性聚氨酯膠粘劑（水性聚氨酯—脲）。恒天的專家提醒，此法僅適用于脂肪族或脂環(huán)族聚氨酯水分散體的合成，而價(jià)格低且性能優(yōu)良的芳香族端異氰酸酯預(yù)聚體與水的反應(yīng)則較快，因此在水中胺擴(kuò)鏈的效果較差。
The prepolymer method that dimer active hydrophilic component in the pre, to obtain a certain viscosity range of prepolymer in water emulsion and waterborne polyurethane adhesive chain growth, eventually obtained stable (aqueous polyurethane urea). Experts from hengtian chemical industry remind that this method is only suitable for the synthesis of aliphatic or alicyclic polyurethane aqueous dispersions, while the aromatic isocyanate prepolymer with low price and excellent performance is faster than water, so the effect of amine chain extension in water is poor.
二、丙酮法
Two, acetone method
丙酮法屬于溶液法，是以有機(jī)溶劑稀釋或溶解聚氨酯（或預(yù)聚體），再進(jìn)行乳化的方法。在溶劑存在的情況下，預(yù)聚體與親水性擴(kuò)鏈劑進(jìn)行擴(kuò)鏈反應(yīng)，生成分子量較高的聚氨酯，反應(yīng)過(guò)程中可根據(jù)需要加人適量溶劑以降低聚氨酯溶液的粘度，使之易于攪拌，之后加水進(jìn)行分散，使之形成乳液，最后蒸去溶劑。溶劑以丙酮、甲乙酮居多，故稱為丙酮法。
Acetone method is a solution method, which is an organic solvent to dilute or dissolve polyurethane (or prepolymer) and then emulsify. In the presence of a solvent, prepolymer chain reaction and hydrophilic chain extender, polyurethane forming high molecular weight, the reaction process can be adding solvent to reduce the viscosity of polyurethane solution, making it easy to stir after water were dispersed to form emulsion, finally evaporating solvent. The solvent is acetone and methyl ethyl ketone, so it is called acetone method.
丙酮法和預(yù)聚體法的主要區(qū)別是，在丙酮法中，聚氨酯先預(yù)聚成分子量較大的預(yù)聚體，但由于分子量越大的預(yù)聚體粘度也越大，因此必須加入適量溶劑進(jìn)行稀釋以降
The main difference between acetone method and prepolymer method is that polyurethane can be prepolymerized into a larger molecular weight prepolymer in acetone process. However, because the viscosity of prepolymer with larger molecular weight is bigger, it is necessary to add appropriate solvent to dilute it.
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