熔融指数测定仪 自动计算 质量法 体积法

一 产品简介
      该仪器执行JB/T5456标准要求，适用GB/T3682、ISO1133。。等标准，
　　熔体流动速率仪是试验方法测定热塑性塑料在高温下流动性能的仪器，我司熔体流动速率仪采用美国微电脑（单片机）控制，中文操作界面，自动试验结果；用于聚乙烯(PE)、聚丙烯(PP)、聚甲醛（POM）、聚苯乙烯（PS）、ABS 塑料、聚碳酸酯(PC)等在高温下熔体流动速率的测定 可以测ＭFR值，配有打印机，手动自动两种切料方式。具有操作简便，控制精度高等优点。
二、工作原理：
   熔体流动速率仪是一种挤出型塑料计。它是在规定温度条件下，用高温加热炉使被测物达到熔融状态。这种熔融状态的被测物，在规定的砝码的负荷重力下通过一定直径的小孔进行挤出试验。在工业企业的塑料生产中及科研单位的研究中，经常用“熔体（质量）流动速率”来表示高分子材料在熔融状态下的流动性、粘度等物理性能。
三、产品优势：
   制作工艺精湛
   大液晶中文显示
   微电脑程序控制
   电脑PID分段控温，温度精密度高
   温度自动修正
   自动切料
   自动计算测试结果
   自带打印机打印结果
四、技术性能：
 温度范围：室温-450℃
 显示精度：0.01℃
 恒温精度：±0.01℃。
 电源：220V±10%    50Hz
 工作环境条件：环境温度为10℃-40℃；环境相对湿度为30%-80%；周围无腐蚀性介质，无较强的空气对流；周围无振动、无较强的磁场干扰。
仪器外形尺寸：250×350×510=（长×宽×高）
五、工艺性能
口 模 内 径 Φ2.095±0.005mm 
口 模 长 度 8.000±0.025 mm 
料 筒 内 径 Φ9.550±0.025 mm 
料 筒 长 度 152±0.1 mm 
活塞杆头直径 9.475±0.005 mm 
活塞杆头长度 6.350±0.100 mm 
砝码精度：0.1%；千分之一
六、砝码配置：（砝 码   精 度：0.1%）
 

级别	质 量	重 量	组     成
1级	0.325 kg	3.187 N	活塞杆+砝码托盘+隔热套+1号砝码体
2级	1.200 kg	11.77 N	0.325+2号0.875砝码
3级	2.160 kg	21.18 N	0.325+3号1.835砝码
4级	3.800 kg	37.26 N	0.325+4号3.475砝码
5级	5.000 kg	49.03 N	0.325+5号4.675砝码
6级	10.000 kg	98.07 N	0.325+5号4.675砝码+6号5.000砝码
7级	12.000 kg	122.58 N	0.325+5号4.675砝码+6号5.000+7号2.500砝码
8级	21.600 kg	211.82 N	0.325+2号0.875砝码+3号1.835+4号3.475+5号4.675+6号5.000+7号2.500+8号2.915砝码

七、附件配置：
      防爆工具箱     1个     ABS
      砝码              1套     计8件（其中1号砝 码组合在1级内）
      砝码托盘        1个    （组合在1级砝码内）
      料斗              1个    （不锈钢）
     口模清理棒      1个    （不锈钢）
     装料杆            1个    （不锈钢）
     料筒清洗杆      1个    （不锈钢）
     活塞杆            1个    （不锈钢）
     口模               1个    （碳化钨）
     水准仪            1个    （45#钢）

八：试样添加量与流动系数+剪切速率对应表 
 

试样添加量与流动系数+剪切速率对应表
熔体流动速率g/10min	料筒中样品质量g	挤出物切段时间间隔s
0.1-0.5	3-5	240
>0.5-1	4-6	120
>1-3.5	4-6	60
>3.5-10	6-8	30
>10	6-8	5-15
1、如果本试验中所得的数值小于0.1g/10min或大于100g/10min，建议不测熔体流动速度 2、当材料密度大于1.0g/10min时，可能需增加试样量。 3、当测定MFR大于25g/10min的材料时，为获得足够的再现性，可能需要对小于0.1s的切断时间间隔进行自动控制和测量或使用方法B

九、熔融指数测试条件（仅供参考）
 

材料	试验温度θ,℃	标称负荷mnom，kg
ABS	230	10.00
PE	190	2.16
PE	190	0.325
PE	190	21.60
PE	190	5.00
PP	230	2.16
PS	200	5.00
PS-1	200	5.00
E/VAC	150	2.16
E/VAC	190	2.16
E/VAC	125	0.325
SAN	220	10.00
ASA、ACS、AEC	220	10.00
PC	300	1.2
PMMA	230	3.8
PB	190	2.16
PB	190	10.00
POM	190	2.16
MABS	220	10.00

十、熔体流动速率计算公式：

MFI值：即为分子量流动与剪切速率之间的关系。
  
熔体流动指数值国际通用单位是：g/10min;意思即为每10分钟流出多少克？就是指塑胶在熔融状态下，600秒时间挤出来的量，

熔体（质量）流动速率仪用MFR表示，单位为：克/10分钟（g/min）公式表示：MFR(θ、mnom )
                       =tref  .m/t
式中： θ——  试验温度
          mnom—  标称负荷Kg
           m ——  切断的平均质量g
          tref ——  参比时间（10min）, S ( 600s )
           t  ——  切断的时间间隔s
     举例：一组塑料试样，每30秒钟切取一段，各段质量的结果是：0.125克、0.132克、0.138克、0.129克、0.135克取。

平均值m =（0.125+0.132+0.138+0.129+0.135）÷5=0.131(克)
代入公式：MFR=600×0.131/30=2.620(克/10分钟)
MI值=2.620g/10min
A product introduction
The instrument performs the JB/T5456 standard requirements, and is applicable to GB/T3682 and ISO1133.
Such as standard,
Melt flow rate meter is a test method for determination of thermoplastic plastic flow at high temperature performance of the instrument, we melt flow rate instrument adopts the latest microcomputer (SCM) control, Chinese interface, automatic test results;
Used in polyethylene (PE), polypropylene (PP), polyformaldehyde (POM), polystyrene (PS), ABS plastic, polycarbonate (PC) at high temperature melt flow rate can be measured to determine the MFR value, equipped with a printer, manually, automatic two cutting material.
It has the advantages of simple operation and high precision.
Ii. Working principle:
Melt flow rate meter is an extruded plastic meter.
It is under the specified temperature condition, the heat furnace is used to make the measured objects melt.
This molten state is tested by means of a certain diameter hole under the weight of the specified weight.
In industrial enterprises in the production of plastic and scientific research units of study, often with the melt flow rate (quality) to represent the liquidity of polymer materials in the molten state, viscosity and other physical properties.
Iii. Product advantages:
Exquisite workmanship
Large LCD Chinese display
Microcomputer program control
Computer PID section control temperature, high temperature precision
Automatic temperature correction
Automatic cutting
Automatic calculation of test results
Print the results with your own printer
Iv. Technical performance:
Temperature: room temperature - 450 ℃
Display precision: 0.01 ℃
Constant temperature precision: plus or minus 0.01 ℃.
Power supply: 220V plus or minus 10% 50Hz
Work environment: the environment temperature is 10 ℃ and 40 ℃;
Environmental relative humidity is 30%-80%;
There is no corrosive medium, no strong convection of air;
There is no vibration or strong magnetic interference.
Device dimensions: 250 x 350 x 510= (long * wide x height)
5. Process performance
Opening a mould diameter Φ 2.095 + / - 0.005 mm
The mouth mode is 8.000 + 0.025mm
Within the cylinder diameter Φ 9.550 + / - 0.025 mm
The cylinder length is 152 + 0.1mm
Piston rod head diameter 9.475 + 0.005 mm
Piston rod head length 6.350 + 0.100 mm
Weight accuracy: 0.1%;
One over one thousand
6. Weight allocation: (high precision: 0.1%)
The level of mass weight is in the group
Level 1 0.325 kg 3.187 N piston rod + weight tray + heat shield +1 weight
Level 2:1.200 kg 11.77 N 0.325+2
Level 3. 2.160 kg 21.18 N 0.325+3 1.835 weight
Level 4:3.800 kg 37.26 N 0.325+4 3.475 weight
5.000 kg 49.03 N 0.325+5 4.675 weight
Level 6:10.000 kg 98.07 N 0.325+5 4.675 farmar +6 5.000 weight
Level 7, 12.000 kg 122.58 N 0.325+5 4.675 weight +6 5.000+7 2.500 weight
 
8
21.600 kg
211.82 N
0.325+ 2, 0.875 weight + 3, 1.835+ 4, 3.475+ 5, 4.675+ 6, 5.000+7 2.500+8 2.915 weight

Vii. Attachment configuration:
Explosion-proof toolbox 1 ABS
Weight 1 set of 8 pieces (one of which is in level 1)
Weight pallet 1 (combination in 1 level)
Hopper 1 (stainless steel)
Mouth mould cleaning rod 1 (stainless steel)
Loading rod 1 (stainless steel)
Cleaning rod 1 (stainless steel)
Piston rod 1 (stainless steel)
Mouth mode 1 (tungsten carbide)
Level 1 (45 # steel)

8: sample addition quantity and flow coefficient + shear rate corresponding table
Sample addition and flow coefficient + shear rate corresponding table
The sample quality of the sample in the melt flow rate g/10min cylinder is divided into the time interval s
0.1-0.5-3-5, 240
> 0.5 1, 4-6, 120
> 1-3.5-4-6 to 60
> 3.5-10 6-8 30
> 10 6-8-5-15
1. If the value obtained in this test is less than 0.1g/10min or greater than 100g/ 10min, it is recommended that the melt flow rate should not be measured
2. When the material density is greater than 1.0g/ 10min, the sample quantity may be increased.
3. When determining the material with MFR greater than 25g/ 10min, to obtain sufficient reproducibility, it may be necessary to automatically control and measure or use method B for the cutting time interval of less than 0.1s

9. Test conditions of melt index (for reference only)
Material test temperature theta, ℃ nominal load mnom, kg
ABS 230 10.00
PE 190 2.16
PE 190 0.325
PE 190 21.60
PE 190 5.00
PP 230 2.16
PS 5.00 200
PS 5.00-1 200
E/VAC 150 2.16
E/VAC 190 2.16
E/VAC 125 0.325
SAN 10.00 220
ASA, ACS, AEC 220 10.00
PC 1.2 300
PMMA 230 3.8
PB 190 2.16
PB 190 10.00
POM 190 2.16
MABS 10.00 220
10. Calculation formula of melt flow rate:

MFI value: the relationship between the molecular weight flow and the shear rate.
  
The international common unit of melt flow is: g/10min;
How many grams per 10 minutes?
That means the amount of plastic extruded in 600 seconds in a molten state.

Melt (mass) flow rate meter is expressed in MFR, and the unit is: gram /10 minutes (g/min) formula: MFR (theta, mnom)
= tref. M/t
In the formula: theta -- test temperature
Mnom - nominal load Kg
M -- the average mass of the cut off is g
Tref - reference time (10min), S (600s)
T -- the time interval between the cuts
For example, a group of plastic samples were cut every 30 seconds, and the results of the quality were 0.125 g, 0.132 g, 0.138 g, 0.129 g and 0.135 grams.

Average m = (0.125 +0.132+0.138+ 0.120.135) =0.131 (g)
Substitution formula: MFR=600 x 0.131/30=2.620 (g /10 minutes)
MI value = 2.620 g / 10 min