PP-R-based stiffening color master batch for preparing polypropylene pipe and preparation method of PP-R-based stiffening color master batch

Abstract

The invention discloses a PP-R-based stiffening color master batch for preparing a polypropylene pipe and a preparation method of the PP-R-based stiffening color master batch. The stiffening color master batch is prepared from PP-R carrier resin, a composite stiffening agent, a dispersing agent, an antioxidant and pigment according to a certain ratio. The preparation method of the stiffening color master batch comprises the following steps: S1, uniformly mixing a bicyclic carboxylic acid metal salt nucleating agent and aluminum borate whiskers to obtain a composite stiffening agent; s2, uniformly mixing the PP-R carrier resin, the composite stiffening agent, the dispersing agent, the antioxidant and the pigment to obtain a mixed material; and S3, adding the mixed material into a double-screw extruder, extruding, bracing, granulating, and cooling to obtain the PP-R-based stiffening color master batch for preparing the polypropylene pipe. According to the PP-R-based rigidity-increasing color master batch, the rigidity and the pressure-bearing performance of the color master batch are greatly improved, meanwhile, the toughness of the color master batch at the low temperature is improved, and therefore the service life of a polypropylene pipe prepared by taking the PP-R-based rigidity-increasing color master batch as the raw material is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene pipe production, and in particular to a PP-R-based rigidity-enhancing masterbatch for preparing polypropylene pipes and a preparation method thereof. Background Art

[0002] The static hydraulic strength requirements for polypropylene pipes are relatively high. At the same time, the pressure-bearing capacity of polypropylene pipes is easily affected by temperature conditions. When the temperature is low in winter, the crystallization during the pipe extrusion process is not perfect, and the pipe is prone to static hydraulic pressure pressure and bursting.

[0003] At present, the masterbatch carrier of polypropylene pipe is LLDPE (linear low-density polyethylene) raw material, but the rigidity and pressure bearing performance of LLDPE raw material are poor, which will affect the pressure bearing capacity of the pipe. Therefore, it is necessary to increase the rigidity of the existing masterbatch of polypropylene pipe to enhance its pressure bearing performance and increase the service life of the polypropylene pipe. Summary of the invention

[0004] Based on the above-mentioned prior art, the present invention provides a PP-R-based rigidity-enhancing masterbatch for preparing polypropylene pipes and a preparation method thereof. The PP-R-based rigidity-enhancing masterbatch of the present invention not only greatly improves the rigidity and pressure-bearing performance of the masterbatch, but also improves the toughness of the masterbatch at low temperatures, thereby improving the life of the polypropylene pipe prepared with the PP-R-based rigidity-enhancing masterbatch as raw material.

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

[0006] A PP-R based rigidity masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0007]

[0008] The composite stiffening agent is composited from a bicyclic carboxylic acid metal salt nucleating agent and an aluminum borate whisker.

[0009] Furthermore, the bicyclic carboxylic acid metal salt nucleating agent is sodium bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate and sodium bicyclo[2.2.1]heptane-2,3-dicarboxylate.

[0010] Furthermore, the addition amount of the bicyclic carboxylic acid metal salt nucleating agent is 0.1-1 parts, and the addition amount of the aluminum borate whisker is 2.9-4 parts.

[0011] Furthermore, the dispersant is ethylene bisstearamide.

[0012] Furthermore, the antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076.

[0013] Furthermore, the pigment is a mixture of titanium dioxide and phthalocyanine green or phthalocyanine blue, wherein the mass ratio of titanium dioxide to phthalocyanine green or phthalocyanine blue is 3:0.8-1.2.

[0014] A PP-R based rigidity masterbatch for preparing polypropylene pipes comprises the following steps:

[0015] S1, mixing a bicyclic carboxylic acid metal salt nucleating agent and an aluminum borate whisker uniformly to obtain a composite stiffening agent;

[0016] S2, mixing the PP-R carrier resin, the composite stiffening agent, the dispersant, the antioxidant and the pigment uniformly to obtain a mixed material;

[0017] S3, adding the mixed material into a twin-screw extruder, extruding and granulating the strands, and cooling to obtain the PP-R based reinforcing masterbatch for preparing polypropylene pipes.

[0018] Furthermore, the processing temperature of the twin-screw extruder barrel is 170-210°C, wherein the temperature of zone 1 is 170-175°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 195-205°C, and the temperature of zone 5 is 205-210°C.

[0019] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0020] 1. The present invention uses a bicyclic carboxylic acid metal salt nucleating agent and an aluminum borate whisker to synergistically act on the PP-R masterbatch, so that the PP-R pipe is perfectly crystallized during low-temperature extrusion, and the rigidity and pressure-bearing performance of the PP-R masterbatch are significantly improved, so that the polypropylene pipe is not prone to the phenomenon of hydrostatic pressure pressure burst at low temperatures, and the service life of the polypropylene pipe is significantly improved.

[0021] 2. The present invention uses a bicyclic carboxylic acid metal salt nucleating agent and an aluminum borate whisker to synergistically act on the PP-R-based masterbatch, and the toughness of the PP-R-based masterbatch at low temperatures is also improved to a certain extent. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1

[0024] A PP-R based rigidity masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0025]

[0026] The preparation method of the above-mentioned PP-R based reinforcing masterbatch for preparing polypropylene pipe is as follows:

[0027] 1. Evenly mix sodium bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate and aluminum borate whiskers to obtain a composite stiffening agent;

[0028] 2. Evenly mix the PP-R carrier resin, the composite stiffening agent, ethylene bisstearamide, the antioxidant 1010, the antioxidant 168, the titanium dioxide and the phthalocyanine green to obtain a mixed material.

[0029] 3. The mixed material is conveyed to a twin-screw extruder, and the extruder current is set to 80A, 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 200°C, and the temperature of the zone 5 is 210°C. The mixture is extruded into strands for granulation and cooled to obtain the PP-R-based reinforcing masterbatch for preparing polypropylene pipes.

[0030] Example 2

[0031] A PP-R based rigidity masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0032]

[0033] The preparation method of the PP-R based reinforcing masterbatch for preparing polypropylene pipes in this embodiment is the same as that in Example 1.

[0034] Example 3

[0035] A PP-R based rigidity masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0036]

[0037] The preparation method of the PP-R based reinforcing masterbatch for preparing polypropylene pipes in this embodiment is the same as that in Example 1.

[0038] Comparative Example 1

[0039] A PP-R based masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0040]

[0041] The preparation method of the PP-R based masterbatch for preparing the polypropylene pipe in this comparative example is the same as that in Example 1.

[0042] Comparative Example 2

[0043] A PP-R based masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0044]

[0045]

[0046] The preparation method of the PP-R based masterbatch for preparing the polypropylene pipe in this comparative example is the same as that in Example 1.

[0047] Comparative Example 3

[0048] A PP-R based masterbatch for preparing polypropylene pipes is prepared from the following raw materials in parts by weight:

[0049]

[0050] The preparation method of the PP-R based masterbatch for preparing the polypropylene pipe in this comparative example is the same as that in Example 1.

[0051] The PP-R masterbatch prepared in Examples 1-3 and Comparative Examples 1-3 was used as a raw material to prepare PPR pipes. The rigidity and toughness of the PPR pipes were tested. The results are shown in the following table:

[0052]

Claims

1. A PP-R based reinforcing masterbatch for preparing polypropylene pipes, characterized in that It is prepared from the following raw materials in parts by weight: The composite stiffening agent is composited from a bicyclic carboxylic acid metal salt nucleating agent and an aluminum borate whisker.

2. The PP-R based reinforcing masterbatch for preparing polypropylene pipe according to claim 1, characterized in that: The bicyclic carboxylic acid metal salt nucleating agent is sodium bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate and sodium bicyclo[2.2.1]heptane-2,3-dicarboxylate.

3. The PP-R based reinforcing masterbatch for preparing polypropylene pipe according to claim 2, characterized in that: The addition amount of the bicyclic carboxylic acid metal salt nucleating agent is 0.1-1 parts by mass, and the addition amount of the aluminum borate whisker is 2.9-4 parts by mass.

4. The PP-R based reinforcing masterbatch for preparing polypropylene pipe according to claim 1, characterized in that: The dispersant is ethylene bisstearamide.

5. The PP-R based reinforcing masterbatch for preparing polypropylene pipe according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076.

6. The PP-R based reinforcing masterbatch for preparing polypropylene pipe according to claim 1, characterized in that: The pigment is a mixture of titanium dioxide and phthalocyanine green or phthalocyanine blue, wherein the mass ratio of titanium dioxide to phthalocyanine green or phthalocyanine blue is 3:0.8-1.

2.

7. A PP-R based reinforcing masterbatch for preparing polypropylene pipes according to claim 1, characterized in that The steps include: S1, mixing a bicyclic carboxylic acid metal salt nucleating agent and an aluminum borate whisker uniformly to obtain a composite stiffening agent; S2, mixing the PP-R carrier resin, the composite stiffening agent, the dispersant, the antioxidant and the pigment uniformly to obtain a mixed material; S3, adding the mixed material into a twin-screw extruder, extruding and granulating the strands, and cooling to obtain the PP-R based reinforcing masterbatch for preparing polypropylene pipes.

8. The PP-R based reinforcing masterbatch for preparing polypropylene pipe according to claim 7, characterized in that: The processing temperature of the twin-screw extruder barrel is 170-210°C, wherein the temperature of zone 1 is 170-175°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 195-205°C, and the temperature of zone 5 is 205-210°C.

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