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通常导致耐磨板反应釜粘壁的四个工艺

所属分类:常见问题 发布时间:2020-12-03 15:19:33 来源:http://www.lcnmb500.com 浏览量:

1、原料因素

1. Raw material factor

因尿素中硫酸盐含量过高,当在树脂缩聚反应的后期加入尿素时,就相当于加入了固化剂,促使树脂快速交联成网状结构,若处理不及时,则会使树脂固化在反应釜内,因此,在生产中应选用标准的工业用尿素原料,使尿素中的硫酸盐含量限制在0.01%以下。

Due to the high sulfate content in urea, when urea is added at the later stage of resin polycondensation reaction, it is equivalent to adding curing agent to promote the rapid crosslinking of resin into network structure. If the treatment is not timely, the resin will be solidified in the reactor. Therefore, standard industrial urea raw materials should be selected in production to limit the sulfate content in urea to less than 0.01%.

2、操作的平衡程度

2. Balance of operation

通常导致HARDOX500耐磨板反应釜粘壁的四个工艺(图1)

当温度、压力等制胶工艺指标控制不稳定或波动过大时,树脂缩聚反应进程不均,容易造成粘壁。故在生产操作中,应缓慢加压、升温。一般通入约0.15Mpa的水蒸汽保持2~3min后再缓缓提压升温。提升速度以每分钟0.1~0.15Mpa为宜。

When the temperature and pressure are not stable or fluctuate too much, the process of resin polycondensation is uneven, which is easy to cause wall sticking. Therefore, in the production operation, it should be slowly pressurized and heated. 3 MPa, then slowly raise the temperature and keep the pressure for about 2-15 min. 1 MPa per minute.

3、釜壁温差

3. Temperature difference of kettle wall

冷却介质温度过低或突然降温,使釜壁温度与物料的温差过大,造成接触HARDOX500耐磨板反应釜釜壁的胶液粘壁。因此无论是加热还是冷却都应在合理温差范围内进行,通常蒸汽使用温度应小于180℃,温差热冲击应小于120℃,冷却冲击应小于90℃。同时应注意确定适宜的冷却介质进、出口温度,保持平衡操作。

When the temperature of cooling medium is too low or the temperature drops suddenly, the temperature difference between the reactor wall and the material is too large, resulting in the glue sticking on the wall of the reactor in contact with hardox500 wear-resistant plate. Therefore, both heating and cooling should be carried out within the reasonable temperature difference range. Generally, the steam service temperature should be less than 180 ℃, the temperature difference thermal shock should be less than 120 ℃, and the cooling shock should be less than 90 ℃. At the same time, attention should be paid to determine the appropriate inlet and outlet temperature of the cooling medium to maintain balanced operation.

4、反应温度和时间

4. Reaction temperature and time

当反应液温度低于80℃时,若用氯化氨作催化剂,由于氯化氨反应速度快,PH值显示不出来,待温度升高后,PH值迅速下降,反应速度加快,缩聚反应过于激烈造成凝胶而出现粘壁。另外,缩聚反应时间过长,树脂的分子量大,黏度过高也易出现粘壁现象。因此,操作时应正确控制缩聚反应的温度和时间,及时终止反应。一般反应液温度控制在0~95℃以内为宜。

When the reaction temperature is below 80 C, if ammonia chloride is used as catalyst, the pH value will not show up due to the rapid reaction of ammonia chloride. When the temperature rises, pH will decrease rapidly, the reaction speed will accelerate, and the condensation reaction will be too intense, resulting in sticky walls. In addition, if the polycondensation reaction time is too long, the molecular weight of the resin is large and the viscosity is too high. Therefore, the temperature and time of polycondensation should be controlled correctly and the reaction should be terminated in time. Generally, the temperature of reaction solution should be controlled within 0 ~ 95 ℃.