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TPU是Thermoplastic Urethane的簡(jiǎn)稱，中文名稱為熱塑性聚氨酯彈性體，TPU是由二苯甲烷二異氰酸酯（MDI）或甲苯二異氰酸酯（TDI）等二異氰酸酯類分子和大分子多元醇、低分子多元醇（擴(kuò)鏈劑）共同反應(yīng)聚合而成的高分子材料。它的分子結(jié)構(gòu)是由二苯甲烷二異氰酸酯（MDI）或甲苯二異氰酸酯（TDI）和擴(kuò)鏈劑反應(yīng)得到的剛性嵌段以及二苯甲烷二異氰酸酯（MDI）或甲苯二異氰酸酯（TDI）等二異氰酸酯分子和大分子多元醇反應(yīng)得到的柔性鏈段交替構(gòu)成的。TPU具有卓越的高張力、高拉力、強(qiáng)韌和耐老化的特性，是一種成熟的環(huán)保材料。目前，TPU已廣泛應(yīng)用與醫(yī)療衛(wèi)生、電子電器、工業(yè)及體育等方面，其具有其它塑料材料所無(wú)法比擬的強(qiáng)度高、韌性好、耐磨、耐寒、耐油、耐水、耐老化、耐氣候等特性，同時(shí)他具有高防水性透濕性、防風(fēng)、防寒、抗菌、防霉、保暖、抗紫外線以及能量釋放等許多優(yōu)異的功能。
熱塑性聚氨酯彈性體TPU按分子結(jié)構(gòu)可分為聚酯型和聚醚型兩種，按加工方式可分為注塑級(jí)、擠出級(jí)、吹塑級(jí)等。
什么是熱流道成型
所謂熱流道成型是指從注射機(jī)噴嘴送往澆口的塑料始終保持熔融狀態(tài)，在每次開(kāi)模時(shí)不需要固化作為廢料取出，滯留在澆注系統(tǒng)中的熔料可在再一次注射時(shí)被注入型腔。
理想的注塑系統(tǒng)應(yīng)形成密度一致的部件，不受所有的流道、飛邊和澆口水口的影響。相對(duì)冷流道來(lái)講，熱流道要做到這一點(diǎn)，就必須維持材料在熱流道內(nèi)的熔融狀態(tài)，不會(huì)隨成形件送出。熱流道工藝有時(shí)稱為熱集流管系統(tǒng)，或者稱為無(wú)流道模塑。
基本來(lái)講，可以把熱集流管視為機(jī)筒和注塑機(jī)噴嘴的延伸部分。熱流道系統(tǒng)的作用就是把材料送到模內(nèi)的每一澆口。
二、組合式熱流道系統(tǒng)優(yōu)勢(shì)多
熱流道系統(tǒng)作為模具系統(tǒng)的一個(gè)常用部件，能夠有效地提高塑料制品的質(zhì)量、提高生產(chǎn)效率，并使資本的投入得到更高的回報(bào)。現(xiàn)在，一種新型的組合式熱流道系統(tǒng)閃亮登場(chǎng)，它又會(huì)給我們帶來(lái)哪些驚喜呢？
今天，嵌件成型技術(shù)、共注射成型技術(shù)以及多組分注塑成型技術(shù)都離不開(kāi)熱流道的支持。大量的部件諸如汽車(chē)保險(xiǎn)杠等因?yàn)榱鲃?dòng)路徑的限制、壁厚的比率以及熔合縫問(wèn)題而只能采用熱流道模具進(jìn)行加工成型。在注射成型中，熱流道系統(tǒng)所扮演的角色越來(lái)越重要。
盡管熱流道和注射模具是一個(gè)整體，然而它的作用和功能與模具本身相比是完全不同的。對(duì)于系統(tǒng)組成的獨(dú)立單元，其安裝、連接和運(yùn)行都有特殊的高精度的位置要求。由于這些原因，熱流道系統(tǒng)的裝配就成為模具安裝的一個(gè)瓶頸。因此，避免熱流道系統(tǒng)安裝過(guò)程中的錯(cuò)誤以及簡(jiǎn)化系統(tǒng)連接并節(jié)約裝配時(shí)間就成為一個(gè)很重要的課題。
三、常規(guī)的熱澆道設(shè)計(jì)
熱澆道系統(tǒng)源于熱流道系統(tǒng)。通常，噴嘴不一定總是安裝在分流板上，也可以虛連在噴嘴法蘭上，但是這類系統(tǒng)需要固定板以保持系統(tǒng)的一體性。
對(duì)于大多數(shù)塑料加工過(guò)程來(lái)說(shuō)，由于模具的溫度接近200℃，所以在熱流道與模具之間存在著溫度差異。如果系統(tǒng)被連接在模具板上，將會(huì)升高溫度并增加熱量的損失，并且在分流板和噴嘴之間也可能產(chǎn)生流動(dòng)*角。
當(dāng)熱流道需要維修時(shí)，熱澆道必須完全從模具上拆除。由于噴嘴沒(méi)有連接到分流板上，電氣和液壓線路必須完全拆開(kāi)，并在檢修結(jié)束后再進(jìn)行連接。
四、組合式熱流道系統(tǒng)
在組合式熱流道系統(tǒng)中，噴嘴、分流板形成了一個(gè)簡(jiǎn)單的單元。熔體從分流板直接流進(jìn)噴嘴，因而不會(huì)產(chǎn)生偏差以及流動(dòng)*角。通過(guò)螺紋噴嘴被嵌入到分流板中，消除了噴嘴與分流板之間的泄漏現(xiàn)象。傳統(tǒng)的襯套系統(tǒng)設(shè)計(jì)會(huì)產(chǎn)生熱膨脹，而這種組合式系統(tǒng)在消除此類泄漏上特別有效。
組合式熱流道系統(tǒng)位于模具的中心位置且與模具的聯(lián)接很少，其制造材料不要求具有很高的熱傳導(dǎo)性，也不要求設(shè)置箝位以及對(duì)模具片預(yù)加張力。這種最低限度的連接提供了高精度和穩(wěn)定的溫度曲線，因此能量的消耗比傳統(tǒng)的熱流道系統(tǒng)要低得多。
組合式熱流道系統(tǒng)能夠直接預(yù)裝配獨(dú)立于模具的液壓線路。液壓設(shè)備直接驅(qū)動(dòng)的閥門(mén)口也可以直接安裝在系統(tǒng)上，這樣就省略了傳統(tǒng)機(jī)器上的控制閥，使注塑成型更加靈活。另外，電器以及液壓線路也可以按照客戶的要求進(jìn)行配置。由于系統(tǒng)在交付前會(huì)經(jīng)歷電氣、溫度、液壓或氣壓的檢測(cè)，因此客戶會(huì)得到預(yù)安裝系統(tǒng)的說(shuō)明，從而可以很容易地在模具內(nèi)進(jìn)行安裝并馬上投入生產(chǎn)。
當(dāng)模具或系統(tǒng)需要常規(guī)的維護(hù)時(shí)，組合式熱流道系統(tǒng)可以同樣采用簡(jiǎn)單的步驟從模具上拆卸下來(lái)，從而可以獨(dú)立于模具進(jìn)行修理和檢測(cè)。
通常，組合式熱流道系統(tǒng)降低了維修成本。完整的熱流道系統(tǒng)基于組合式的預(yù)配設(shè)計(jì)和安裝，裝配過(guò)程中加熱器或熱電偶的導(dǎo)線被去掉。連接加熱器和配電箱的導(dǎo)線被安放在一個(gè)特別設(shè)計(jì)的導(dǎo)管中，這對(duì)模具或者熱流道系統(tǒng)的拆卸都是很有利的。同時(shí)，綜合的熱流道系統(tǒng)能夠進(jìn)行免拆卸日常維護(hù)，從而節(jié)約了時(shí)間并減少了裝配錯(cuò)誤發(fā)生的幾率
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PA6 (polycaprolactam # nylon 6) /B1ST/ Yuyao confluence
Uses: other
Characteristic note: super tough, cold resistant, -40 degrees centigrade
Important parameters: notched impact strength: 89 tensile strength: 61.4 MPa, elongation at break: 437%
Manufacturer: Yuyao confluence Plastics & Chemical Co., Ltd.
PA6 (polycaprolactam # nylon 6) /BS10BK9501/ Vita in the UK
Uses: other
Important parameters: density: 1.14 g/cm3 water absorption: 1.9% notched impact strength: 5 tensile strength: 45 MPa, elongation at break: 25% bending strength: 50 MPa bending modulus: 2200 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BS10NT6336/ Vita in the UK
Uses: other
Important parameters: density: 1.13 g/cm3 water absorption: 2.6% notched impact strength: 6 tensile strength: 75 MPa, elongation at break: 330% bending strength: 95 MPa bending modulus: 2800 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /M241UV/ Marplex in Australia
Uses: other
Important parameters: elongation at break: 4% bending strength: 130 MPa bending modulus: 3850 MPa, hot deformation temperature: 145 DEG C
Manufacturer: Australia Marplex company
PA6 (polycaprolactam # nylon 6) /BS10VN6313/ Vita in the UK
Uses: other
Important parameters: density: 1.13 g/cm3 water absorption: 2.6% notched impact strength: 5 tensile strength: 75 MPa, elongation at break: 35% bending strength: 120 MPa bending modulus: 2800 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BS10VN6551/ Vita in the UK
Uses: other
Important parameters: density: 1.13 g/cm3 water absorption: 2.6% notched impact strength: 5 tensile strength: 75 MPa, elongation at break: 35% bending strength: 120 MPa bending modulus: 2800 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BS10VN6607/ Vita in the UK
Uses: other
Important parameters: density: 1.13 g/cm3 water absorption: 2.6% notched impact strength: 5 tensile strength: 75 MPa, elongation at break: 35% bending strength: 120 MPa bending modulus: 2800 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BS30GY6577/ Vita in the UK
Uses: other
Important parameters: density: 1.13 g/cm3 water absorption: 2.6% notched impact strength: 8 tensile strength: 73 MPa, elongation at break: 3% bending strength: 83 MPa bending modulus: 2200 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BS70OR6594/ Vita in the UK
Uses: other
Important parameters: density: 1.13 g/cm3 water absorption: 2.6% notched impact strength: 5 tensile strength: 75 MPa, elongation at break: 35% bending strength: 120 MPa bending modulus: 2800 MPa, hot deformation temperature: 65 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BT39NT6508/ Vita in the UK
Uses: other
Important parameters: density: 1.51 g/cm3 water absorption: 1.3% notched impact strength: 20 tensile strength: 210 MPa, elongation at break: 3% bending strength: 230 MPa bending modulus: 11000 MPa, hot deformation temperature: 205 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /BW10NT6621/ Vita in the UK
Uses: other
Important parameters: density: 1.15 g/cm3 water absorption: 2.6% notched impact strength: 5 tensile strength: 70 MPa, elongation at break: 35% bending strength: 105 MPa bending modulus: 2700 MPa, hot deformation temperature: 75 DEG C
Manufacturer: UK Vita group
PA6 (polycaprolactam # nylon 6) /6500 A/ Germany Gunther
Uses: other
Characteristic note: performance characteristic: good fluidity, thermal stability, medium viscosity.
Important parameters: density: 1.14 g/cm3 notched impact strength: 3 tensile strength: 80 MPa, elongation at break: 20%
Manufacturer: Plastics in Germany
PA6 (polycaprolactam # nylon 6) /MRGF1878-BKJA6A/ Wellman
Uses: other
Important parameters: density: 1.38 g/cm3 notched impact strength: 5 bending strength: 160 MPa bending modulus: 7800 MPa, hot deformation temperature: 200 DEG C
Manufacturer: American Wellman company
PA6 (polycaprolactam # nylon 6) /HC 15/ Polyplastic of Russia
Uses: other
Important parameters: density: 1.19 g/cm3, water absorption: 1.2% molding shrinkage: 0.6% notched impact strength: 25 bending strength: 170 MPa bending modulus: 7500 MPa, hot deformation temperature: 191 DEG C
Manufacturer: Russian Polyplastic group
PA6 (polycaprolactam # nylon 6) /B70 GK30/ Germany Bada
Uses: other
Features: good dimensional stability
Important parameter: density: 1.32 g/cm3, water absorption rate: 7%, notch impact strength: 5, hot deformation temperature: 180 degrees centigrade
Manufacturer: Bada, Germany
PA6 (polycaprolactam # nylon 6) /B70 S/ Germany Bada
Uses: other
Characteristic note: good liquidity, nuclear
Important parameter: density: 1.13 g/cm3, water absorption rate: 9.5%, notch impact strength: 6, hot deformation temperature: 1800 degrees centigrade
Manufacturer: Bada, Germany
PA6 (polycaprolactam # nylon 6) /601 BK/ ATR
Uses: other
Important parameters: density: 1.14 g/cm3 absorption rate: 0.25% molding shrinkage rate: 0.9% notched impact strength: 59 tensile strength: 75 MPa elongation: 30% flexural modulus: 2820 MPa hardness: 120 thermal deformation temperature of 57.2 DEG C: filler content: 0.8%
Manufacturer: American ATR company
PA6 (polycaprolactam # nylon 6) /2009/142/ Holland Witcom
Uses: other
Remark: conductivity, halogen free, flame retardant property
Important parameters: density: 1.26 g/cm3 water absorption: 2% notched impact strength: 4.5 bending strength: 170 MPa bending modulus: 9000 MPa, hot deformation temperature: 200 DEG C
Manufacturer: Holland Witcom engineering plastics company
PA6 (polycaprolactam # nylon 6) /4BA2/ Changzhou xingyidi
Uses: other
Characteristic note: toughening
Important parameters: density: 1.08 g/cm3, elongation at break: 40% bending strength: 102 MPa bending
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