CN101003175A - Method for manufacturing Nano material of drainpipe - Google Patents

Abstract

The processing method of nano-drainage pipe: ①Mixing: Put all the combined raw materials into the hot mixer and mix them. The materials are heated by stirring friction to generate heat, and then cold-mixed and discharged; ②Extrusion: The stirred mixture is put into the conical twin-screw. Extruder, the pipe is extruded from the extrusion die; ③Sizing: the extruded pipe is cooled and shaped in a vacuum cooling box with a sizing sleeve, and then cooled to 30°C to 50°C in a water cooling box; ④Cutting and testing: after cooling The pipe is cut and tested according to the required length; the characteristic is that the mixed raw materials are: nano-calcium carbonate, PVC resin, stabilizer, lubricant and filler.

Description

Processing method of nano drainage pipe

technical field

The invention relates to a processing method of nano drainage pipes, in particular to a processing method of PVC-U nano drainage pipes, belongs to the field of plastic building materials, and is mainly used for drainage in buildings or buried underground.

Background technique

PVC-U drainage pipes used in buildings or buried drainage must meet the needs of use, and must have a certain strength and rigidity, that is, product testing must pass the drop hammer impact test and tensile strength test. The existing general-purpose PVC-U drainage pipes still have insufficient impact resistance. In order to improve the impact resistance of PVC-U products (that is, to improve the toughness of the product), the usual method is to add different proportions of CPE and MBS to the product components. , ACR and other rubber elastomers for modification. However, when the rubber elastic body increases the toughness of the PVC-U drainage pipe to make it reach the drop weight impact test, it is at the cost of reducing (sacrificing) the rigidity of the PVC-U drainage pipe. Once the rigidity of PVC-U drainage pipe is reduced, the tensile strength cannot meet the test requirements. On the other hand, since the price of rubber elastomers such as CPE, MBS, and ACR is higher than that of PVC, using them to modify PVC-U drainage pipes always increases the cost.

Contents of the invention

The object of the present invention is to overcome the shortcomings of the prior art, and provide a method for processing nano drainage pipes with improved drop impact performance and tensile strength and reduced product cost.

The technical scheme of the processing method of nano drainage pipe material of the present invention is:

① Mixing: Put all the combined raw materials into the hot mixer and mix them. The materials will heat up through stirring and friction, and then they will be cold mixed and discharged;

②Extrusion: Put the stirred mixture into the conical twin-screw extruder, and extrude the pipe from the extrusion die;

③Sizing: After the extruded pipe is cooled and shaped by a sizing sleeve in a vacuum cooling box, it is continued to cool in a water cooling box to 30°C to 50°C;

④ Cutting and testing: the cooled pipe is cut and tested according to the required length;

It is characterized in that the mixed raw materials are: nanometer calcium carbonate, PVC resin, stabilizer, lubricant and filler.

The physical properties of the PVC-U nano-drainage pipe of this technical solution meet the requirements of relevant standards, and the inner and outer surfaces of the pipe are smooth, smooth, and free of defects. ℃, TIR ≤ 10%, Vicat softening temperature ≥ 83 ℃, longitudinal shrinkage ≤ 5%, dichloromethane immersion test, 15 ℃, 30min, no corrosion on the surface of the sample.

The processing method of the nano drainage pipe of the present invention, the ratio of the mixed raw materials is: by weight, 100 parts of PVC resin, 5-10 parts of nano-calcium carbonate, 10-15 parts of light calcium carbonate, and 2.4-2.6 parts of composite lead , 0.6-1.0 parts of stearic acid, 1-2 parts of titanium dioxide, and 0-4 parts of chlorinated polyethylene. The composite lead described in it is the composite lead salt of lubricant+lead salt. The mixing is to add the raw materials into the hot mixer according to the proportion of raw materials and mix them at high speed. The materials are heated by friction to generate heat, and the materials are discharged after the temperature reaches above 130°C. Its described high-speed mixing is about 2500 rpm hot stirring. Its hot stirring high-speed mixing time is 7-9 minutes. Its described cold stirring is stirring at a slow speed or adding cooling water.

Detailed ways

The invention discloses a method for processing nanometer drainage pipes. The processing steps are divided into:

①The first step is to mix firstly: add each combination of raw materials into the hot mixer according to the proportion and mix them, the materials will heat up by stirring and friction, and then the materials will be cold mixed and discharged;

②The second step is extrusion: the stirred mixture is put into the hopper of the extruder, metered into the conical twin-screw extruder, the temperature, material pressure and extrusion speed are controlled, and the pipe is extruded from the extrusion die;

③ The third step is shaping: after the extruded pipe is cooled and shaped by a sizing sleeve in a vacuum cooling box, continue to cool in a water cooling box to 40°C or lower, such as 30°C to 50°C;

④ The fourth step is cutting and testing: the cooled pipe is printed and cut according to the required length, and then tested and qualified for storage and packaging;

Its main technical feature is that the mixed raw materials are: nanometer calcium carbonate, PVC resin, stabilizer, lubricant and filler. The ratio of the mixed raw materials is: according to the weight ratio, take 100 parts of PVC resin, 5-10 parts of nano-calcium carbonate, 10-15 parts of light calcium carbonate, 2.4-2.6 parts of composite lead, 0.6-1.0 parts of stearic acid, titanium White powder 1-2 parts, chlorinated polyethylene 0-4 parts. PVC resin is the main raw material, nano calcium carbonate is the modified material, composite lead is the stabilizer and lubricating aid, titanium dioxide is the pigment, and light calcium carbonate is the filler. The composite lead described in it is the composite lead salt of lubricant+lead salt, which is available in the market. The mixing is to add the raw materials into the hot mixer according to the weight ratio of the raw materials for high-speed mixing. The materials are stirred and rubbed against each other to generate heat and heat up. After the temperature reaches above 130°C, the materials are discharged, and they are placed in a cold mixer to cool and stir to cool down to below 45°C. material. Its described high-speed mixing is about 2500 rpm hot stirring. The hot stirring and high-speed mixing time is 7-9 minutes, generally about 8 minutes. Its described cold stirring is stirring at a slow speed or adding cooling water to stir. And there are coloring materials in the mixed raw materials, and various color products can be made according to the needs.

Claims (7)

1. Processing method of nano drainage pipe: ① Mixing: Put all the combined raw materials into the hot mixer and mix them. The materials will heat up through stirring and friction, and then they will be cold mixed and discharged; ②Extrusion: Put the stirred mixture into the conical twin-screw extruder, and extrude the pipe from the extrusion die; ③Sizing: After the extruded pipe is cooled and shaped by a sizing sleeve in a vacuum cooling box, it is continued to cool in a water cooling box to 30°C to 50°C; ④ Cutting and testing: the cooled pipe is cut and tested according to the required length; It is characterized in that the mixed raw materials are: nanometer calcium carbonate, PVC resin, stabilizer, lubricant and filler. 2. The processing method of nano-drainage pipes as claimed in claim 1, characterized in that the proportion of mixed raw materials is: by weight, 100 parts of PVC resin, 5-10 parts of nano-calcium carbonate, 10-15 parts of light calcium carbonate 2.4-2.6 parts of composite lead, 0.6-1.0 parts of stearic acid, 1-2 parts of titanium dioxide, and 0-4 parts of chlorinated polyethylene. 3. The processing method of nanometer drainage pipes as claimed in claim 2, characterized in that said composite lead is a composite lead salt of lubricant + lead salt. 4. The processing method of nano-drainage pipes as claimed in claim 2, characterized in that the mixing is to add the raw materials into a hot mixer according to the ratio of raw materials and mix them at high speed, and the materials will be heated by friction to generate heat, and the materials will be discharged after the temperature reaches above 130°C , put it in a cold mixer to cool down to below 45°C and discharge. 5. The processing method of nano drainage pipes according to claim 4, characterized in that said high-speed mixing is 2500 rpm hot stirring. 6. The processing method of nano-drainage pipes as claimed in claim 4, characterized in that the high-speed mixing time of hot stirring is 7-9 minutes. 7. The processing method of nano-drainage pipes according to claim 4, characterized in that said cold stirring is performed at a slow speed or with cooling water.