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TPU是Thermoplastic Urethane的簡稱，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、擠出級、吹塑級等。
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)，在每次開模時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。相對冷流道來講，熱流道要做到這一點，就必須維持材料在熱流道內(nèi)的熔融狀態(tài)，不會隨成形件送出。熱流道工藝有時稱為熱集流管系統(tǒng)，或者稱為無流道模塑。
基本來講，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)勢多
熱流道系統(tǒng)作為模具系統(tǒng)的一個常用部件，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，F(xiàn)在，一種新型的組合式熱流道系統(tǒng)閃亮登場，它又會給我們帶來哪些驚喜呢？
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)都離不開熱流道的支持。大量的部件諸如汽車保險杠等因為流動路徑的限制、壁厚的比率以及熔合縫問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)所扮演的角色越來越重要。
盡管熱流道和注射模具是一個整體，然而它的作用和功能與模具本身相比是完全不同的。對于系統(tǒng)組成的獨立單元，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瓶頸。因此，避免熱流道系統(tǒng)安裝過程中的錯誤以及簡化系統(tǒng)連接并節(jié)約裝配時間就成為一個很重要的課題。
三、常規(guī)的熱澆道設(shè)計
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。
對于大多數(shù)塑料加工過程來說，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*角。
當(dāng)熱流道需要維修時，熱澆道必須完全從模具上拆除。由于噴嘴沒有連接到分流板上，電氣和液壓線路必須完全拆開，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、分流板形成了一個簡單的單元。熔體從分流板直接流進(jìn)噴嘴，因而不會產(chǎn)生偏差以及流動*角。通過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)計會產(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)裝配獨立于模具的液壓線路。液壓設(shè)備直接驅(qū)動的閥門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)在交付前會經(jīng)歷電氣、溫度、液壓或氣壓的檢測，因此客戶會得到預(yù)安裝系統(tǒng)的說明，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，組合式熱流道系統(tǒng)可以同樣采用簡單的步驟從模具上拆卸下來，從而可以獨立于模具進(jìn)行修理和檢測。
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)計和安裝，裝配過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)線被安放在一個特別設(shè)計的導(dǎo)管中，這對模具或者熱流道系統(tǒng)的拆卸都是很有利的。同時，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)約了時間并減少了裝配錯誤發(fā)生的幾率
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PA6 (polycaprolactam # nylon 6) /TNG66-20GHP/ Shanghai tops
Uses: other
Important parameters: density: 1.29 g/cm3 tensile strength: 160 MPa elongation at break: 5% bending strength: 250 MPa hardness: 120, hot deformation temperature: 185 DEG C
Shanghai Tao Sheng Industrial Development Co., Ltd.
PA6 (polycaprolactam # nylon 6) /PA G6-33/ Lucent
Uses: other
Important parameters: density: 1.38 g/cm3 molding shrinkage: 0.4%, elongation at break: 4% bending strength: 214 MPa bending modulus: 6890 MPa, hot deformation temperature: 204 DEG C
Manufacturer: American Lucent, Polymer Co
PA6 (polycaprolactam # nylon 6) /PA G66-13/ Lucent
Uses: other
Important parameters: density: 1.23 g/cm3, notch impact strength: 37.4, elongation at break: 3% bending strength: 159 MPa bending modulus: 4480 MPa, hot deformation temperature: 232 DEG C
Manufacturer: American Lucent, Polymer Co
PA6 (polycaprolactam # nylon 6) /PA G66-33/ Lucent
Uses: other
Important parameters: density: 1.38 g/cm3, notch impact strength: 64.1, elongation at break: 3% bending strength: 221 MPa bending modulus: 7580 MPa, hot deformation temperature: 243 DEG C
Manufacturer: American Lucent, Polymer Co
PA6 (polycaprolactam # nylon 6) /PG39/ India GLS
Uses: other
Important parameters: density: 1.2 g/cm3 molding shrinkage rate: 0.3% notched impact strength: 40 tensile strength: 100 MPa elongation: 2% bending strength: 130 MPa flexural modulus: 4000 MPa VEKA softening point: deformation temperature of 210 DEG C heat: 58 degrees
Manufacturer: India GLS polymer (private) Co., Ltd.
PA6 (polycaprolactam # nylon 6) /ADDINYL B2 V15/ Addiplast of France
Appliance parts
Characteristic note: high rigidity
Important parameter: density: 1.25 g/cm3 bending modulus: 5000 MPa hardness: 83, hot deformation temperature: 200 DEG C
Manufacturer: France Addiplast company
PA6 (polycaprolactam # nylon 6) /ADDINYL B2 V30/ Addiplast of France
Appliance parts
Characteristic note: high rigidity
Important parameter: density: 1.37 g/cm3 bending modulus: 8200 MPa hardness: 83, hot deformation temperature: 210 DEG C
Manufacturer: France Addiplast company
PA6 (polycaprolactam # nylon 6) /ADDINYL B2 V50/ Addiplast of France
Appliance parts
Characteristic note: high rigidity
Important parameter: density: 1.55 g/cm3 bending modulus: 14500 MPa hardness: 84, hot deformation temperature: 215 DEG C
Manufacturer: France Addiplast company
PA6 (polycaprolactam # nylon 6) /ADDINYL C2 V20/ Addiplast of France
Appliance parts
Characteristic note: high rigidity
Important parameter: density: 1.29 g/cm3 bending modulus: 5600 MPa hardness: 84, hot deformation temperature: 230 DEG C
Manufacturer: France Addiplast company
PA6 (polycaprolactam # nylon 6) /N2017STL/ Ravago
Uses: other
Features: super high toughness, improved impact resistance, lubricated
Important parameters: water absorption: 1%, elongation at break: 3.5% bending strength: 117 MPa bending modulus: 3790 MPa
Manufacturer: Ravago USA
PA6 (polycaprolactam # nylon 6) /200 A MS/ RTP
Uses: other
Characteristic note: lubricated
Important parameters: density: 1.17 g/cm3 molding shrinkage: 1% notched impact strength: 37.4 tensile strength: 79.3 MPa bending strength: 114 MPa bending modulus: 3100 MPa, hot deformation temperature: 71.1 DEG C
Manufacturer: American RTP company
PA6 (polycaprolactam # nylon 6) /F30 FR5/ polykemi
Uses: other
Characteristic note: flame retardant property
Important parameters: density: 1.52 g/cm3 molding shrinkage: 0.9% notched impact strength: 10 bending strength: 225 MPa bending modulus: 9000 MPa VEKA softening point: 205 degrees of hot deformation temperature: 195 DEG C
Manufacturer: polykemi company
PA6 (polycaprolactam # nylon 6) /B12^ NH9/ polykemi
Uses: other
Remark: halogen free and flame retardant property
Important parameters: density: 1.14 g/cm3 molding shrinkage: 1% bending strength: 90 MPa bending modulus: 2500 MPa hardness: 73 VEKA softening point: 200 degrees of hot deformation temperature: 63 degrees centigrade
Manufacturer: polykemi company
PA6 (polycaprolactam # nylon 6) /B22^E F30/ polykemi
Uses: other
Important parameters: density: 1.33 g/cm3 molding shrinkage: 0.3% notched impact strength: 17 bending strength: 210 MPa bending modulus: 7800 MPa VEKA softening point: 200 degrees of hot deformation temperature: 190 DEG C
Manufacturer: polykemi company
PA6 (polycaprolactam # nylon 6) /B22^E F40/ polykemi
Uses: other
Important parameters: density: 1.42 g/cm3 molding shrinkage: 1.3% notched impact strength: 18 bending strength: 230 MPa bending modulus: 8800 MPa VEKA softening point: 200 degrees of hot deformation temperature: 200 DEG C
Manufacturer: polykemi company
PA6 (polycaprolactam # nylon 6) /B32^E F30/ polykemi
Uses: other
Important parameters: density: 1.31 g/cm3 molding shrinkage: 0.3% bending strength: 210 MPa bending modulus: 7500 MPa hardness: 76 VEKA softening point: 200 degrees of hot deformation temperature: 190 degrees centigrade
Manufacturer: polykemi company
PA6 (polycaprolactam # nylon 6) /B32^E Q30/ polykemi
Uses: other
Important parameters: density: 1.31 g/cm3 molding shrinkage: 0.9% notched impact strength: 11 bending strength: 75 MPa bending modulus: 2000 MPa VEKA softening point: 200 degrees of hot deformation temperature: 100 DEG C
Manufacturer: polykemi company
PA6 (polycaprolactam # nylon 6) /XP36-C1/ Holland DSM
Uses: other
Characteristic note: performance characteristic: after lubrication, has the nucleus, the high viscosity.
Important parameter: density: 1.13 g/cm3, water absorption: 9.5%
Manufacturer: Holland DSM company
PA6 (polycaprolactam # nylon 6) /XP36-E1/ Holland DSM
Uses: other
Characteristic note: performance characteristic: after lubrication, has the nucleus, the high viscosity.
Important parameter: density: 1.13 g/cm3, water absorption: 9.5%
Manufacturer: Holland DSM company
PA6 (polycaprolactam # nylon 6) /LS135/ Hyundai
use
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