CN1051922A - 聚酯塑料瓶 - Google Patents
聚酯塑料瓶 Download PDFInfo
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Abstract
以热塑性聚合物组合物用挤出、拉坯吹塑法生产
塑料瓶。热塑性聚合物组合物包括含金属颗粒的聚
合物,优先选择的是聚酯,所含的金属(特别是锑)颗
粒的特性吸收是在辐射波长为500nm至2000nm的
区域内,其量应使聚合物的再热时间少于无此量金属
颗粒的聚合物的再热时间。在合成聚合物的同时还
原金属化合物以制取含金属的聚合物组合物的方
法。
Description
本发明涉及一种包装材料,特别涉及用聚合物组合物制成的塑料瓶,又特别是用聚酯组合物制成的塑料瓶。
利用聚酯组合物,特别是聚对苯二甲酸乙二醇酯或其共聚物(后通称“PET”)作为包装材料(例如以薄膜、瓶子或其他容器的形式)是已经为人们熟知的事。用塑料瓶或其他容器(后称塑料瓶)盛装如苏打饮料之类的加压液体时,以聚合物碎屑形式的组合物通常是以两道工序制成瓶状的:第一,注射模塑制成型坯,第二,立刻或在放置片刻后用压缩空气将型坯吹入模中成为最终的瓶形。吹塑步骤使组合物至少在瓶的选择区域内产生双轴定向作用,因此可使瓶子在使用时能抵抗由于内压力而产生的变形。在第二道工序中,型坯通常是处于环境温度下的,在吹塑步骤时须将其加热至100℃左右。此“再热”的步骤是第二道工序中的决定速率的步骤。
再热步骤所用的市售加热器多数是石英红外灯,其最强的辐射区域波长为500nm至2000nm。PET对该区域的电磁辐射的特性吸收较低。所观察到的此材料的任何吸收常常是悬浮的异物(例如催化剂残留物和杂质)所引起的,并且此吸收是悬浮物质引起的光散射和悬浮物质可显示的任何特性吸收的结合。因此,PET组合物的再热速率是非常取决于组合物的清洁与否的,脏的组合物由于污染物的存在而有相对高的雾度水平,其再热速率比清洁的组合物快。在某些应用中,组合物可含有颜料以使组合物着色(如绿色或褐色),这些颜料对于减少组合物的再热时间起了作用,但是许多应用要求具有最小雾度的未着色(即不加颜料或染料)组合物,在这种情况下,使组合物的再热时间显著减少所要求的污染物的含量会导致组合物的雾度不合要求。
申请人发现,含有小量细微金属颗粒的聚合物组合物、特别是聚酯组合物的再热时间有惊人的和有效程度的减少,同时保持了可接受的雾度水平。
因此,本发明的目的是提供含金属颗粒的聚合物的包装材料,金属颗粒的特性吸收是在辐射波长为500nm至2000nm的区域内,含金属的量应使聚合物的再热时间小于无此量金属颗粒的聚合物的再热时间。
本发明的包装材料可特别采取瓶子的形式,如吹塑瓶、特别是注坯吹塑瓶,又特别是注射拉坯吹塑瓶。本发明包括可以用其生产此类塑料瓶的型坯、特别是注射模塑瓶型坯。
本发明也提供一种生产热塑性聚合物组合物的方法,该组合物由含金属颗粒的聚合物组成,金属颗粒的特性吸收是在辐射波长为500nm至2000nm区域内,其量应使聚合物的再热时间小于无此量金属颗粒的聚合物的再热时间,该方法包括将聚合物和可被还原的金属化合物与一种可以将该化合物还原成金属的还原剂相混合,使还原剂与金属化合物反应产生颗粒极细的金属。
本发明的方法可用来制造包装材料,特别是注坯吹塑包装材料,又特别是注射拉坯吹塑的包装材料、塑料瓶和可制造注塑瓶的型坯。在这些方法中,包装材料是由含金属颗粒的组合物制成的。用这些方法进行吹塑瓶的生产一般包括由含金属颗粒的聚合物组合物制成的注塑瓶型坯的预热步骤。
在本发明中使用的热塑性聚合物最常见的是聚酯、特别是至少主要由芳族二酸和脂肪(包括环状脂肪)二醇制得部分芳族聚酯、特别是聚酯衍生物。优先选择的部分芳族聚酯是含有至少50mol%、最好是至少70mol%的对苯二甲酸乙二醇酯残基的聚酯。在聚酯中也可含有由间苯二甲酸乙二醇酯、萘二甲酸乙二醇酯、对苯二甲酸乙氧基亚乙酯、间苯二甲酸乙氧基亚乙酯或萘二甲酸乙氧基亚乙酯衍生的残基。
适合的金属有锑、锡、铜、银、金、砷、镉、汞、铅、钯和铂或者它们之中二或二种以上的混合物。对于大多数的应用来说,银、金、砷、镉、汞、铅、钯和铂是比较昂贵的,或者是损害环境的,因此这些金属不是特别优先选择的金属。较满意的金属是锑、锡或铜中的一种或多钟,其中锑是特别有用的。
金属颗粒最好要有足够的细度,用肉眼观察不到,其粒度大小能在相对较宽的波长范围内而不是在一个特定波长或在较窄的区域内出现辐射吸收。
可以将金属颗粒以极细的颗粒状态加入到聚合物中,但我们发现以可还原形式的金属提供给聚合物是特别有利的,特别是以极细的金属化合物颗粒并在聚合物中加入一种适合的还原剂是特别有利的。金属化合物和还原剂之间的反应,例如在聚合物加工过程中进行反应,可导致形成遍布于聚合物中的金属。特别是当聚合物为聚对苯二甲酸乙二醇酯(或共聚物)时,将可被还原的金属化合物与还原剂在合成此聚合物时加入是有利的。如果金属为锑,此方法特别有利,将在下面叙述。
用于组合物中的金属颗粒的量是用以在所需减少的聚合物再热时间和一个给定的应用所能接受的雾度的量之间进行平衡。比较适合的金属颗粒的量为3ppm-300ppm(ppm为百万分之一重量份),优先选择5ppm-150ppm,特别是10ppm-100ppm。如果需要,可制备含金属颗粒量十分高的聚合物组合物母料以备与基本无金属颗粒的聚合相混合,制成含有所需要的颗粒含量的聚合物。
使用可被还原的金属化合物时,能够很容易地由化学计算和其后的实验决定还原剂的用量。在某些聚合物体系中,还须加入超化学计量的还原剂以补尝损失和清洁作用(如还原剂与溶于聚合物中之氧之间的反应)等。适合的还原剂有磷(Ⅲ)化合物,如亚磷酸或亚磷酸三苯酯。
在聚酯组合物中,锑是特别优先选择的金属,如以三氧化二锑(三价锑氧化物)形式存在的锑。在制备如聚对苯二甲酸乙二醇酯之类的聚酯时它是单体聚合的催化剂。由于聚酯单体熔融体是一微弱的还原环境,聚酯中自然会有一很小比例的金属锑存在,例如1ppm至2ppm。但是含量这么低的金属锑不会显著影响再热时间。所以有必要将聚合物中的金属锑的含量提高到高于此基本含量。
本发明的聚合物组合物还可含其他本技术领域中悉知的添加剂和/或润滑剂,如催化剂、加工助剂、抗氧剂、填充剂、增塑剂和核化剂。
通常,如聚对苯二甲酸乙二醇酯(PET)之类的聚酯是用二酸(作为游离酸)或其二甲酸与二醇反应,制得预聚物,然后再将其进行缩聚成为聚酯。需要时可用固态聚合进一步提高聚酯的分子量。
本发明包括由本发明的热塑性聚酯组合物制成的包装材料。
下面以实施例对本发明进行说明。所用的份或百分数均以重量计,除非另有指明。
试验方法
雾度:聚合物组合物的雾度测定是用标准尺寸的组合物块和加德纳雾度计(Gardener Haze meter)测定的。
亮度和黄度:聚合物组合物的亮度和黄度的测定是用数字色监测器测定的(数字色监测器是三色激励滤色片测色计,其设计能定量测定可见光谱的三个波长区域内的反射光强度),由Instrumental Colour Systems(Newbury,Barkshire,GB)提供。
再热时间:聚合物组合物的再热时间的估计是将型坯暴露于环境温度(21℃)下加热45秒钟,再平衡20秒钟,然后测定型坯内表面的温度。型坯的加热是在Krupp Corpolast LB01拉坯吹塑机中进行的,该机装有红外石英电阻加热器。型坯是放在机内的旋转台上的,以确保均匀加热。型坯内表面的温度是用热电偶测定的,热电偶的末端与内表面接触。
实施例1
在装有加热夹套、搅拌机、冷凝器和压力/真空联接器的钢热压釜中于260±5℃的温度下加入熔融的聚对苯二甲酸乙二醇酯预聚物(70Kg)和磷酸(21.0g,300ppm)、亚磷酸(2.80g,40ppm)与乙二醇(500ml)的溶液。十分钟后在热压釜中加入三氧化二锑(17.5g,250ppm)于乙二醇(500ml)中的浆液。30分钟后热压釜中的压力降至1毫巴以下。聚合反应的进行伴随着乙二醇的消失。在达到所需求的融体粘度(相当于约0.6dl/g的特性粘度(Ⅳ)时,用氮将气体压力增至约2巴。然后将聚合物倾入水中骤冷,切成碎片。将所得到的非晶形聚合物碎片按上述方法进行亮度和测色试验。
在氮气流(预热至约215℃)中将碎片加热至约215℃使聚合物碎片进行固态聚合,氮气流速为30l/min,直至聚合物的Ⅳ增至接近0.8dl/g为止。
将一部分生成的聚合物组合物(样品6)模经干燥、然后注塑制成4mm厚的型坯,用于测定雾度和再热速率以与常规聚对苯二甲酸乙二醇酯(样品1)进行比较。预成型件是用55g预成型模和-Negri Bossi NB90注塑机制成的。试验结果和实施例2-5所制得的样品的试验结果总结于表1中。
实施例2
分别使用10、15、20、30和80ppm的亚磷酸将实施例1重量五次,制取样品2、3、4、5和7。
实施例3
在制取试验件以前将部分样品7按1∶1的重量比与常规聚对苯二甲酸乙二醇酯样品混合(样品8)。
实施例4
重复实施例1,但使用21g(最终产品的300ppm)亚磷酸和35g(最终产品的500ppm)三氧化锑(样品9)。
实施例5
在制取试验件以前将一部分样品9按1∶10的重量比与常规聚对苯二甲酸乙二醇酯样品混合(样品10)。
实施例6
重复实施例1,但以70g亚磷酸三苯酯(最终产品的1000ppm)代替亚磷酸(样品11)。
实施例7
将组合物1和4-7的型坯在Krupp机(恒定温度、不定时间)上吹塑,以测定成功吹塑成瓶所需要的最小暴置期,即由于冷吹,吹瓶时没有引发应力发白现象。结果列下表2。
从实施例和表1、2可以看出,由于相对小量的三氧化二锑被还原成金属锑,再热速率有了明显的改进,而聚合物不出现明显的雾度、黄度或亮度的增加。
实施例8
除了加酸后10分钟在热压釜中加入5.1g醋酸铜-水合物(最终产品的73ppm)于乙二醇(100ml)中的溶液,再过10分钟后加入三氧化二锑浆液外,重复实施例1。所得到的非晶形聚合物具有微橙色,说明有金属铜存在。经再热速率试验,测定由此聚合物制成的型坯内表面的温度为114℃。
实施例9
除以五氧化二锑代替三氧化二锑外,重复实施例1。经再热速率试验,由此聚合物制成的型坯的内表面的温度为113℃。
表1
注:
1 pH=苯基
2 Sb(O)含量由所用的P(Ⅲ)化合物和Sb(Ⅲ)化合物进行估计。
表2
P(Ⅲ)化合物含量(ppm) 最小加工时间(秒)
0 60
20 52
30 48
40 45
80 42
Claims (16)
1、一种包装材料,该包装材料由热塑性聚合物组合物组成,该组合物包括含金属颗粒的聚合物,金属颗粒的特性吸收是在辐射波长为500nm至2000nm的区域内,其量应使聚合物的再热时间少于无该量金属颗粒的聚合物的再热时间。
2、权利要求1所述的包装材料,其形状是瓶子。
3、权利要求2所述的包装材料,其中的瓶子是吹塑瓶。
4、权利要求3所述的包装材料,其中的瓶子是挤坯吹塑瓶。
5、权利要求1所述的包装材料,其形状是注塑瓶的型坯。
6、权利要求1至5任一项所述的包装材料,其中的聚合物是聚酯,该聚酯含有至少70mol%对苯二甲酸乙二醇酯残基,还可以进一步含有由间苯二甲酸乙二醇酯、萘二酸乙二醇酯、对苯二甲酸乙氧基亚乙基酯、间苯二甲酸乙氧基亚乙基酯或萘二甲酸乙氧基亚乙基酯衍生的残基。
7、权利要求1至6任一项所述的包装材料,其中的金属是锑、锡、铜、银、金、砷、镉、汞、铅、钯和铂中的一种或多种,其量是聚合物重量的3ppm至300ppm。
8、权利要求7所述的包装材料,其中的金属是锑,其量是聚合物重量的10ppm至100ppm。
9、制备热塑性聚合物组合物的方法,该组合物包括含金属颗粒的聚合物,金属颗粒的特性吸收是在辐射波长为500nm至2000nm的区域内,其量应使聚合物的再热时间少于无该量金属颗粒的聚合物的再热时间,该方法包括在聚合物中加入可被还原的极细的金属化合物颗粒和能将金属化合物还原成金属的还原剂,并使金属化合物与还原剂进行反应以产生极细的金属颗粒。
10、一种制备包装材料的方法,该包装材料由热塑性聚合物的组合物组成,该组合物包括含金属颗粒的聚合物,金属颗粒的特性吸收是在辐射波长为500nm至2000nm的区域内,其量应使聚合物的再热时间少于无该量金属颗粒的聚合物的再热时间,该方法包括在聚合物中加入可被还原的极细的金属化合物颗粒和能将金属化合物还原成金属的还原剂,并使金属化合物与还原剂进行反应以产生极细的金属颗粒,然后由聚合物组合物形成包装材料。
11、一种制备吹塑瓶型坯的方法,该方法包括在热塑性聚合物中加入可被还原的极细的金属化合颗粒和能将金属化合物还原成金属的还原剂,并使金属化合物与还原剂进行反应以产生极细的金属颗粒,金属颗粒的特性吸收是在辐射波长为500nm至2000nm的区域内,其量应使聚合物的再热时间少于无此量金属颗粒的聚合物的再热时间,然后用聚合物组合物注塑成瓶的型坯。
12、一种生产塑料瓶的方法,该方法包括在热塑性聚合物中加入可被还原的极细的金属化合物颗粒和能将金属化合物还原成金属的还原剂,并使金属化合物与还原剂进行反应以产生极细的金属颗粒,金属颗粒的特性吸收是在辐射波长为500nm至2000nm的区域内,其量应使聚合物的再热时间少于无此量金属颗粒的聚合物的再热时间,然后用聚合物组合物注塑成瓶的型坯,将型坯再热并由再热的型坯吹塑成瓶。
13、权利要求12所述的方法,该方法包括在吹瓶之前或同时的拉坯步骤。
14、权利要求9至13任一项所述的方法,其中的聚合物是聚酯,该聚酯包括至少70mol%的对苯二甲酸乙二醇酯残基,还可进一步包括由间苯二甲酸乙二醇酯、萘二甲酸乙二醇酯、对苯二甲酸乙氧基亚乙基酯、间苯二甲酸乙氧基亚乙基酯或萘二甲酸乙氧基亚乙基酯衍生的残基。
15、权利要求9至14任一项所述的方法,其中可被还原的金属化合物颗粒和还原剂是作为聚合物进行合成的一部分加入聚合物的,并且形成金属颗粒的反应的至少一部分是与聚合物的合成同时发生的。
16、权利要求9至15任一项所述的方法,其中可被还原的金属化合物是三价锑氧化物、还原剂是三价磷化合物。
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-
1989
- 1989-11-24 GB GB898926631A patent/GB8926631D0/en active Pending
-
1990
- 1990-11-16 GB GB909025019A patent/GB9025019D0/en active Pending
- 1990-11-20 IE IE419290A patent/IE904192A1/en not_active IP Right Cessation
- 1990-11-20 ZA ZA19909312A patent/ZA909312B/xx unknown
- 1990-11-22 MW MW89/90A patent/MW8990A1/xx unknown
- 1990-11-22 DE DE69031937T patent/DE69031937T2/de not_active Revoked
- 1990-11-22 DK DK90312751T patent/DK0429311T3/da active
- 1990-11-22 EP EP90312751A patent/EP0429311B1/en not_active Revoked
- 1990-11-22 AT AT90312751T patent/ATE162206T1/de not_active IP Right Cessation
- 1990-11-22 ES ES90312751T patent/ES2111532T3/es not_active Expired - Lifetime
- 1990-11-22 CA CA002030668A patent/CA2030668C/en not_active Expired - Lifetime
- 1990-11-22 JP JP2315664A patent/JPH03230933A/ja active Pending
- 1990-11-24 CN CN90109656A patent/CN1034871C/zh not_active Expired - Fee Related
- 1990-11-24 KR KR1019900019102A patent/KR0170389B1/ko not_active IP Right Cessation
- 1990-11-26 ZW ZW183/90A patent/ZW18390A1/xx unknown
-
1991
- 1991-04-21 ZM ZM52/90A patent/ZM5290A1/xx unknown
-
1993
- 1993-07-06 US US08/088,097 patent/US5419936A/en not_active Expired - Lifetime
-
1995
- 1995-02-06 US US08/384,643 patent/US5529744A/en not_active Expired - Lifetime
- 1995-12-15 CN CN95121329A patent/CN1051954C/zh not_active Expired - Fee Related
- 1995-12-15 CN CN95121331A patent/CN1051100C/zh not_active Expired - Fee Related
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1998
- 1998-01-26 GR GR980400165T patent/GR3025994T3/el unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101880445A (zh) * | 2004-03-30 | 2010-11-10 | 嘉洛斯欧洲有限公司 | 聚合物材料及其添加剂 |
CN102173027A (zh) * | 2011-01-08 | 2011-09-07 | 王�忠 | 注塑成型设备及使用该设备注塑金属感高光注塑件的工艺 |
Also Published As
Publication number | Publication date |
---|---|
EP0429311A3 (en) | 1992-09-30 |
ZW18390A1 (en) | 1991-10-02 |
ZA909312B (en) | 1992-04-29 |
EP0429311B1 (en) | 1998-01-14 |
ZM5290A1 (en) | 1991-08-30 |
CN1131609A (zh) | 1996-09-25 |
DE69031937T2 (de) | 1998-04-30 |
CN1034871C (zh) | 1997-05-14 |
KR0170389B1 (ko) | 1999-03-30 |
KR910009804A (ko) | 1991-06-28 |
GR3025994T3 (en) | 1998-04-30 |
CN1051100C (zh) | 2000-04-05 |
CA2030668C (en) | 2001-07-31 |
US5529744A (en) | 1996-06-25 |
EP0429311A2 (en) | 1991-05-29 |
IE904192A1 (en) | 1991-06-05 |
ES2111532T3 (es) | 1998-03-16 |
CA2030668A1 (en) | 1991-05-25 |
ATE162206T1 (de) | 1998-01-15 |
JPH03230933A (ja) | 1991-10-14 |
GB8926631D0 (en) | 1990-01-17 |
US5419936A (en) | 1995-05-30 |
DE69031937D1 (de) | 1998-02-19 |
DK0429311T3 (da) | 1998-09-07 |
MW8990A1 (en) | 1992-01-08 |
GB9025019D0 (en) | 1991-01-02 |
CN1051954C (zh) | 2000-05-03 |
CN1130564A (zh) | 1996-09-11 |
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