PVC color master batch with excellent weather resistance and preparation method thereof

Abstract

The invention discloses a PVC color master batch with excellent weather resistance and a preparation method thereof. The PVC color master batch is prepared from PVC resin, magnesium oxide, a nitrogen-substituted hindered amine light stabilizer, a flexibilizer, a heat stabilizer, a lubricant and a pigment according to a certain ratio. The preparation method of the PVC color master batch comprises the following steps: S1, uniformly mixing the PVC resin, the magnesium oxide, the nitrogen-substituted hindered amine light stabilizer, the flexibilizer, the stabilizer, the lubricant and the pigment to obtain a mixed material; and S2, adding the mixed material into a double-screw extruder, and carrying out extrusion granulation, so as to obtain the PVC color master batch with excellent weather resistance. The PVC color master batch has good weather resistance and toughness, other properties can meet the requirements of the national standard, the PVC color master batch is applied to outdoor engineering and has long-term stability, and the service life is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of PVC pipe production, and in particular to a PVC masterbatch with excellent weather resistance and a preparation method thereof. Background Art

[0002] PVC pipes have been unanimously praised by the engineering community for their light weight, corrosion resistance, high compressive strength, safety and convenience. PVC pipes have a wide range of use scenarios in outdoor engineering applications, mainly including municipal engineering, construction engineering, industrial sewage engineering, agriculture and garden engineering, and road engineering.

[0003] In actual engineering applications, the weather resistance of PVC pipes has an important impact on their service life and performance. For example, PVC pipes used outdoors need to withstand direct sunlight, temperature changes and rain erosion. If the weather resistance is poor, the pipe surface may change color, age, or even crack, affecting its use effect and safety. Therefore, choosing high-quality PVC pipes and through special treatment and correct product design can significantly improve its weather resistance and service life outdoors. Summary of the invention

[0004] Based on the above-mentioned prior art, the present invention provides a PVC masterbatch with excellent weather resistance and a preparation method thereof. The PVC masterbatch has good weather resistance and toughness, and other properties can also meet the requirements of national standards. It is applied to outdoor projects, has long-term stability, and greatly improves the service life.

[0005] The technical solution adopted to achieve the above-mentioned purpose of the present invention is:

[0006] A PVC masterbatch with excellent weather resistance is prepared from the following raw materials in parts by weight:

[0007]

[0008] Furthermore, the nitrogen-substituted hindered amine light stabilizer is any one of Tinuvin 770, Tinuvin 123, and Tinuvin 445.

[0009] Furthermore, the toughening agent is one of CPE and ACR.

[0010] Furthermore, the heat stabilizer is one of an organic tin stabilizer and a calcium zinc stabilizer.

[0011] Furthermore, the lubricant is at least one of calcium stearate, oxidized polyethylene wax, PE wax and glyceryl monostearate.

[0012] Furthermore, the pigment is at least one of titanium dioxide, permanent yellow HGR, phthalocyanine blue, phthalocyanine green and carbon black.

[0013] A method for preparing PVC masterbatch with excellent weather resistance comprises the following steps:

[0014] S1. Evenly mix PVC resin, magnesium oxide, nitrogen-substituted hindered amine light stabilizer, toughening agent, stabilizer, lubricant and pigment to obtain a mixed material;

[0015] S2. Add the mixed material into a twin-screw extruder, extrude and granulate, and obtain the PVC masterbatch with excellent weather resistance.

[0016] Furthermore, the processing temperature of the twin-screw extruder barrel is 160-200°C, wherein the temperature of zone 1 is 165-175°C, the temperature of zone 2 is 175-185°C, the temperature of zone 3 is 185-195°C, the temperature of zone 4 is 180-190°C, and the temperature of zone 5 is 160-170°C.

[0017] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0018] 1. The present invention uses ultraviolet absorber magnesium oxide and nitrogen-substituted hindered amine light stabilizer to synergistically modify PVC resin, which can greatly improve the weather resistance of PVC masterbatch, so that the prepared PVC pipe can withstand the effects of direct sunlight, temperature changes and rain erosion on the PVC pipe for a long time when used in outdoor projects, so that PVC has long-term stability and greatly improves its service life.

[0019] 2. The ultraviolet absorber magnesium oxide and the nitrogen-substituted hindered amine light stabilizer of the present invention synergistically modify the PVC resin. Compared with the commonly used organic tin stabilizer, the calcium zinc stabilizer plays a certain positive role in improving the weather resistance. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to specific embodiments, but these embodiments are not to be interpreted as limiting the protection scope of the present invention in any sense.

[0021] Example 1

[0022] A PVC masterbatch with excellent weather resistance is prepared from the following raw materials in parts by weight:

[0023]

[0024]

[0025] The preparation method of the above-mentioned PVC masterbatch with excellent weather resistance is as follows:

[0026] 1. Add PVC resin, magnesium oxide, Tinuvin 123, ACR, calcium zinc stabilizer, PE wax, glyceryl monostearate and titanium dioxide into a high mixing pot and mix evenly, then cool to obtain a mixed material.

[0027] 2. The mixed material is conveyed to a twin-screw extruder, and the extruder current is set to 75A, the temperature of the barrel zone 1 is 170°C, the temperature of the zone 2 is 180°C, the temperature of the zone 3 is 190°C, the temperature of the zone 4 is 180°C, and the temperature of the zone 5 is 170°C. Extrusion granulation and drying are performed to obtain the PVC masterbatch with excellent weather resistance.

[0028] Example 2

[0029] A PVC masterbatch with excellent weather resistance is prepared from the following raw materials in parts by weight:

[0030]

[0031] The preparation method of the PVC masterbatch with excellent weather resistance in this embodiment is the same as that in Example 1.

[0032] Example 3

[0033] A PVC masterbatch with excellent weather resistance is prepared from the following raw materials in parts by weight:

[0034]

[0035]

[0036] The preparation method of the PVC masterbatch with excellent weather resistance in this embodiment is the same as that in Example 1.

[0037] Comparative Example 1

[0038] A PVC masterbatch is prepared from the following raw materials in parts by weight:

[0039]

[0040] The preparation method of the PVC masterbatch in this comparative example is the same as that in Example 1.

[0041] Comparative Example 2

[0042] A PVC masterbatch is prepared from the following raw materials in parts by weight:

[0043]

[0044] The preparation method of the PVC masterbatch in this comparative example is the same as that in Example 1.

[0045] Comparative Example 3

[0046] A PVC masterbatch is prepared from the following raw materials in parts by weight:

[0047]

[0048] The preparation method of the PVC masterbatch in this comparative example is the same as that in Example 1.

[0049] Comparative Example 4

[0050] A PVC masterbatch is prepared from the following raw materials in parts by weight:

[0051]

[0052] The PVC masterbatch prepared in Examples 1-3 and Comparative Examples 1-4 was extruded to prepare a PVC drainage pipe (taking a drainage pipe of DN110 as an example) for weather resistance test, and the pipe after the test was subjected to tensile and impact resistance tests, wherein the weather resistance test was conducted in accordance with GB / T 16422.2 method A cycle number 1, and the test time was 1000h; the impact test: the test was conducted in accordance with GB / T 14152; the color change: the judgment was made in accordance with GB / T 250, and the test results are shown in the following table:

[0053]

[0054]

Claims

1. A PVC masterbatch with excellent weather resistance, characterized in that It is prepared from the following raw materials in parts by weight:

2. The PVC masterbatch with excellent weather resistance according to claim 1, characterized in that: The nitrogen-substituted hindered amine light stabilizer is any one of Tinuvin 770, Tinuvin 123 and Tinuvin 445.

3. The PVC masterbatch with excellent weather resistance according to claim 1, characterized in that: The toughening agent is one of CPE and ACR.

4. The PVC masterbatch with excellent weather resistance according to claim 1, characterized in that: The stabilizer is one of an organic tin stabilizer and a calcium zinc stabilizer.

5. The PVC masterbatch with excellent weather resistance according to claim 1, characterized in that: The lubricant is at least one of calcium stearate, oxidized polyethylene wax, PE wax and glyceryl monostearate.

6. The PVC masterbatch with excellent weather resistance according to claim 1, characterized in that: The pigment is at least one of titanium dioxide, permanent yellow HGR, phthalocyanine blue, phthalocyanine green and carbon black.

7. A method for preparing the PVC masterbatch with excellent weather resistance as claimed in claim 1, characterized in that The steps include: S1. Evenly mix PVC resin, magnesium oxide, nitrogen-substituted hindered amine light stabilizer, toughening agent, stabilizer, lubricant and pigment to obtain a mixed material; S2. Add the mixed material into a twin-screw extruder, extrude and granulate, and obtain the PVC masterbatch with excellent weather resistance.

8. The method for preparing PVC masterbatch with excellent weather resistance according to claim 7, characterized in that: The processing temperature of the twin-screw extruder barrel is 160-200°C, wherein the temperature of zone 1 is 165-175°C, the temperature of zone 2 is 175-185°C, the temperature of zone 3 is 185-195°C, the temperature of zone 4 is 180-190°C, and the temperature of zone 5 is 160-170°C.

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