A preparation method of an SPC floor and an SPC floor

Abstract

The present invention relates to the technical field of C08K, and more specifically, the present invention relates to a preparation method of an SPC floor and an SPC floor. The preparation method of the SPC floor includes: mixing raw materials and then performing pre-plasticization, and then performing plasticization and extrusion molding again. The preparation method of the present application is simple to operate, reduces costs compared with the existing process, and saves energy.

Description

Technical Field

[0001] The present invention relates to the technical field of C08K, and more specifically, the present invention relates to a method for preparing an SPC floor and an SPC floor. Background Art

[0002] Currently, SPC floors are widely used. CN201911373093 provides a method for preparing an SPC floor, where various raw materials are mixed at a high temperature of about 120 °C and then cooled to 40 °C and stored in a storage bin, and then heated again for extrusion processing. However, in this process, there are processes of heating up, cooling down, and heating up again, resulting in waste of energy; in addition, this process is not continuous, which not only causes waste of storage equipment, but also the storage bin occupies a large space. CN201810892954 provides a method for preparing an SPC floor, where the raw materials are mixed at a high speed at 125 - 135 °C, cooled to 50 - 55 °C, and then heated again for extrusion. This process also causes waste of energy. Summary of the Invention

[0003] In view of some problems existing in the prior art, the first aspect of the present invention provides a method for preparing an SPC floor, including: mixing the raw materials and then performing pre - plasticization, and then performing plasticization and extrusion molding again.

[0004] In one embodiment, the temperature of the pre - plasticization is 160 - 220 °C, preferably 180 - 210 °C, and more preferably 200 °C.

[0005] In this application, the temperature of the pre - plasticization refers to the temperature of the raw materials.

[0006] Preferably, after the raw materials are mixed, a rotor extruder or a screw extruder is used for plasticization.

[0007] Preferably, the screw speed of the screw extruder is 5 - 40 rpm.

[0008] Preferably, the rotation speed of the rotor extruder is 5 - 40 rpm.

[0009] Preferably, the temperature of the plasticization and extrusion molding is 160 - 220 °C, preferably 180 - 210 °C, and more preferably 200 °C.

[0010] Preferably, a twin - screw or single - screw extruder is used for plasticization and extrusion molding.

[0011] In the prior art, in the preparation method of SPC, after mixing the raw materials, the temperature is heated up to about 120°C, so that auxiliaries such as low-melting lubricants melt and uniformly wrap on the surface of the materials, making the auxiliaries disperse and avoiding affecting the later plasticization effect. Then, the temperature is lowered for storage to avoid the volatilization of the auxiliaries. However, this method is not only time-consuming and laborious, but also causes great waste of energy. The applicant unexpectedly found in the experiment that after mixing the raw materials including lubricants, a rotor extruder or a screw extruder is directly used for pre-plasticization, so that the torque value measured by a torque rheometer for the pre-plasticized raw materials is 15 - 70 N·m, and then plasticization and extrusion molding are carried out in a single-screw or twin-screw extruder. This not only avoids the energy waste of the prior art process, but also when pre-plasticization is carried out at a specific speed in this application and the pre-plasticization effect in this application is achieved, not only are the auxiliaries such as lubricants uniformly mixed with other raw materials, but also the volatilization probability of low-boiling-point lubricants is reduced. The applicant believes that the possible reason is that at this speed, during the gradual melting process of each raw material molecule, the specific hierarchical increase in the fluidity of molecules with different chain lengths increases the intermolecular force, and small molecule substances are protected by PVC molecules, not only having good mixing and dispersibility, but also avoiding the migration of small molecules. In addition, at this torque value, the local instability inside the material is avoided. And in this application, a parallel twin-screw extruder is used for plasticization and extrusion molding, avoiding the power increase and energy waste caused by using a conical twin-screw extruder in the prior art.

[0012] The present invention has the following beneficial effects compared with the prior art:

[0013] (1) In the prior art, it is necessary to first heat to 125°C and then cool to about 55°C. Finally, when entering the screw plasticization and extrusion molding, it is necessary to heat to above 180°C. In this application, the materials are mixed and heated to the temperature required for screw plasticization (above 180°C) without cooling, thus saving energy;

[0014] (2) Using the pre-plasticization step in this application has a better pre-plasticization effect compared with the prior art process route of heating, cooling and then heating;

[0015] (3) In this application, the pre-plasticization effect of the materials before plasticization and extrusion molding is better, and the requirements for temperature, pressure, shear, etc. required for plasticization are lower during plasticization and extrusion molding, further achieving the effect of energy saving;

[0016] (4) This application removes the storage step in the prior art process route and changes it to a continuous process, which can save storage equipment and the space occupied by it;

[0017] (5) This application process saves the cooling process, thus avoiding the volatilization of low-boiling-point lubricants in the formula during the cooling process and saving the cost of raw materials. Specific embodiments

[0018] The present invention will be described below through specific embodiments, but is not limited to the specific examples given below.

[0019] Embodiment

[0020] Example 1

[0021] Embodiment 1 of the present invention provides a method for preparing an SPC floor, specifically: after mixing the raw materials, pre-plasticize at 190 °C using a rotor extruder, and then plasticize and extrude into a mold at 190 °C again using a parallel twin-screw extruder, where the barrel temperature is 185 - 200 °C, the mold temperature is 195 - 220 °C, and the screw length-diameter ratio is 32.

[0022] The rotational speed of the rotor extruder is 20 rpm.

[0023] By weight, the raw materials are 100 parts of PVC resin, 200 parts of heavy calcium carbonate, 5 parts of calcium-zinc stabilizer, 3 parts of polyethylene wax, 3 parts of carbon black N550, and 3 parts of microcrystalline cellulose.

[0024] The PVC resin has the grade HG-1000F and is purchased from Ningbo Weiye Plastic Co., Ltd.

[0025] The heavy calcium carbonate has a particle size of 3000 mesh and is purchased from Shanggao Jiayu Superfine Calcium Carbonate Factory.

[0026] The calcium-zinc stabilizer is purchased from Jinan Yingchu Chemical Technology Co., Ltd.

[0027] The polyethylene wax has a density of 0.95 g / cm 3 and is purchased from Jinan Huijinchuan Trading Co., Ltd.

[0028] The microcrystalline cellulose is purchased from Henan Wanyong Biotechnology Co., Ltd.

[0029] Example 2

[0030] Embodiment 2 of the present invention provides a method for preparing an SPC floor, specifically: after mixing the raw materials, pre-plasticize at 210 °C using a screw extruder, and then plasticize and extrude into a mold at 210 °C again using a parallel twin-screw extruder, where the barrel temperature is 200 - 220 °C, the mold temperature is 205 - 225 °C, and the screw length-diameter ratio is 28.

[0031] The rotational speed of the rotor extruder is 25 rpm.

[0032] The raw materials are the same as those in Embodiment 1.

[0033] Example 3

[0034] Example 3 of the present invention provides a method for preparing an SPC floor, specifically: after mixing the raw materials, pre-plasticize them at 200 °C using a screw extruder, and then plasticize and extrude them again at 200 °C using a single-screw extruder, where the barrel temperature is 185 - 205 °C, the die temperature is 190 - 215 °C, and the screw length-diameter ratio is 28.

[0035] The rotation speed of the rotor extruder is 20 rpm.

[0036] The raw materials are the same as those in Example 1.

[0037] Example 4

[0038] Example 4 of the present invention provides a method for preparing an SPC floor, specifically: mix the raw materials, heat them to 120 °C and stir, then put them into a cold mixer to cool to below 55 °C, store the cooled materials in a storage tank, and then transport them to a conical twin-screw extruder for plasticizing and extruding at 200 °C.

[0039] This method consumes more energy compared to Examples 1 - 3.

[0040] Performance Test

[0041] Torque value: Use a torque rheometer to test the pre-plasticization effect after pre-plasticizing the raw materials in Examples 1 - 3 and the plasticization effect in Example 4, and record the torque value.

[0042] Table 1

[0043]

[0044] In addition, the performance of the SPC floor obtained in Example 3 is as follows:

[0045] Table 2

[0046]

Claims

1. A preparation method of an SPC floor, characterized in that, Including: Mix the raw materials and then carry out pre-plasticization, and then plasticize and extrude them again to form a shape; The temperature of the pre-plasticization is 180 - 210 °C, and the temperature of the plasticizing extrusion molding is 180 - 210 °C; After the raw materials are mixed, they are plasticized using a rotor extruder or a screw extruder; the screw speed of the screw extruder is 5 - 40 rpm; the rotation speed of the rotor extruder is 5 - 40 rpm; The extrusion molding uses a twin-screw or single-screw plasticizing extrusion molding; The torque measured by a torque rheometer at 190 °C for the raw materials after pre-plasticization is 15 - 70 N·m.

2. An SPC floor prepared by the preparation method of the SPC floor according to claim 1.

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