1. Raw gum eats powder slowly

Reason:

1. The molecular weight of raw rubber is high.

2. Silicone Rubber Raw Rubber with Trifunctional Groups in DMC

Handle:

1. Choosing the appropriate molecular weight of raw rubber or reducing the molecular weight of raw rubber

2. Appropriate addition of 500cs~1000cs dimethyl silicone oil or low molecular weight or water in mixing

2. Poor transparency of mixtures

Reason:

1. Silica particles are coarse and difficult to disperse.

2. Low molecular weight is not removed, and there is mist in vulcanizate.

3. Insufficient roll-wrapping times

4. Dirt Storage in Raw Materials

5. Poor sanitation

6. The sealing of equipment is poor. When vacuum is pumped, dirt enters the glue.

7. Short high temperature time in hot smelting

8. improper operation of nitrogen charging

3. The appearance of glue is inconsistent

Reason:

1. Color difference between batches of silica

2. Inconsistent Refining Time

3. The appearances of accessories are different.

Handle:

1. The heating time and temperature should be unified.

2. Pay attention to the color difference between batches of silica and replace it in time after it appears.

3. The rubber should be sent out at the same time to prevent the rubber from discoloring due to long storage time and reaction with air.

4. Unification of raw materials

4. Rubber roll-free

Reason:

1. High Plasticity Value of Rubber Material

2. Low Roll Temperature

Handle:

1. Increase roll temperature and close cooling water

2. Controlling the proper mixing time

3. Adding appropriate auxiliaries

5. Resilience difference

Reason:

1. Irrational Vinyl Formula of Raw Rubber

2. Excessive additives

3. Insufficient refining time, poor infiltration of silica and raw rubber

4. High Refining Temperature

Handle:

1. Proper addition of polyvinyl silicone oil to improve vinyl content

2. Appropriate Dispersion Dose

3. After eating the silica, the refining time is extended to 45 minutes.

4. Guarantee Refining Temperature

6. Poor tearing strength

Reason:

1. Unreasonable Vinyl Groups of Raw Rubber

2. Silica is coarse and its specific surface area is small.

3. Unripe vulcanization

4. Rubber brittleness

Handle:

1. Adjusting Vinyl Content with Polyvinyl Silicone Oil or Vinyl Raw Rubber

2. Replacement of silica fillers, selection of silica with large specific surface area and good performance, replacement of high-quality products

3. Adjusting the dosage and time of vulcanization

4. Reduce vinyl, adjust with methyl silicone oil or low vinyl raw rubber

7. Adhesion

Reason:

1. Bad polymerization of raw rubber, excessive low molecular weight or low molecular weight of raw rubber

2. Poor vacuum pumping

3. Overdose

4. Less release agent

5. Unripe vulcanization

6. Mould cleaning is not clean

Handle:

1. Exchange or dispatch of high molecular weight raw rubber for blending

2. Proper vacuum control

3. Reduce the dispersing dose and mix the glue with the glue

4. Adding release agent

5. Increasing vulcanizate temperature and prolonging vulcanization time

6. Regular cleaning of moulds

7. Use of alternative release agents

8. Large permanent deformation

Reason:

1. Unreasonable mixing ratio, excessive low molecular weight and low vinyl rubber

2. Low Vinyl

3. Poor vacuum

4. Short vulcanization time

Handle:

1. Adding high vinyl raw rubber to increase vinyl content or adding additives appropriately

2. Extending Vacuum Time

3. Extending kneading time at high temperature

9. Rubber yellow

Reason:

1. Raw gum contains NH2 and CL-ions

2. Silica contains more Fe3+

3. Insufficient high temperature and short vacuum time

4. The choice of silica is unreasonable and the appearance is yellow.

5. Poor vacuum or nitrogen filling

Handle:

1. Adding hydrogen-containing silicone oil and other anti-yellowing, the purpose is to react with NH2 and CL-ions to produce NH3 and HCL when vacuum is pumped out.

2. Guarantee high temperature time and temperature, otherwise the reactions of additives with NH2 and CL-ions are insufficient.

3. Change to other brands of silica

4. Guarantee Vacuum and Nitrogen Filling Time

10. Refractory powder in mixing

Reason:

1. Less structural dose

2. Excessive low hydroxyl content in structural agents

3. Raw gum has high molecular weight and narrow molecular weight distribution.

4. Silicone Rubber Raw Rubber with Micro-crosslinking in Raw Rubber

5. The proportion of silica to additives is out of proportion 6. Opening or kneading temperature is too low

Handle:

1. Adding Structural Agents

2. Selection of raw rubber with uniform molecular weight distribution

3. Adding in proportion to structural agent during feeding

4. Increase smelting or kneading temperature appropriately.

11. Explosion in Rubber Refining

Reason:

1. Production of methanol, ethanol flammable gases

2. Electrostatic sparks generated by friction during shearing

3. The equipment is not well sealed and the N2 protection is not enough.

Handle:

1. Choose substances that do not produce explosives or have narrow explosion limits as dispersants.

2. The equipment is well sealed.

3. Nitrogen-filled gas isolates oxygen

OPENING MACHINE PROBLEM

Problem 1: Mixed rubber cannot enter roll spacing or force into side to form fragments.

1. 1. The reason why the blend cannot enter the roll is that the shear force between the two rolls of the mill is not enough to destroy the agglomeration of the blend.

2. 2. From the mechanical point of view, the reasons are: slow speed, small speed ratio, small roll diameter and so on.

3. 3. From the point of view of compound, the reasons are: excessive compound, high cohesion of compound (i.e., high viscosity, high speed, structural phenomenon of compound).

Problem 2: Rubber wrapped rollers have poor performance and even take off rollers

1. 1. The roll-wrapping property of the rubber is related to the raw rubber strength, breaking-tensile ratio, relaxation time, roll temperature and shear rate of the rubber.

2. 2. Increasing raw rubber strength, breaking tensile ratio and relaxation time will improve the performance of rollers, on the contrary, roll-off will occur.

3. 3. Reducing the distance between rolls, increasing the speed ratio or increasing the speed of shearing can increase the drawing ratio, prolong the relaxation time and thus improve the roll-wrapping performance of the compound.

Question 3: Rubber sticking roll and hard-to-leave roll

1. 1. Rubber glue roller is related to the surface tension of rubber material on the roller. The factors related to surface tension are raw rubber itself, the size and dosage of reinforcing filler, the dosage of softener, the temperature of contact surface, etc.

2. 2. So reduce roll temperature and add demoulding