WO2021027072A1 - Preparation method and application for dedicated pvc-o pipe material - Google Patents

Abstract

A preparation method and an application for dedicated PVC-O pipe material, consisting of 100 parts PVC resin, 10-20 parts elastomeric toughener, 1-6 parts heat stabilizer, and 0.6-4 parts lubricant. The preparation method for the dedicated PVC-O pipe material is: kneading together PVC resin and elastomeric toughener on a double roll mill at a roller temperature of 160°C, adding heat stabilizer and lubricant after kneading evenly, and mixing the raw materials together evenly, obtaining a blend. The present method greatly improves toughness and impact resistance of PVC-O pipe, and may be broadly used in water supply piping systems and mining piping systems, expanding the application range of pipes.

Description

Preparation method and application of a special material for PVC-O pipe Technical field

The invention relates to the technical field of polymer materials, in particular to a preparation method and application of a special material for PVC-O pipe materials.

Background technique

Polyvinyl chloride (PVC) pipes are widely used in industrial and agricultural production and other fields due to their light weight, corrosion resistance, excellent insulation performance, convenient construction, easy access to raw materials, and cheap finished products. They are closely related to people’s daily life. With the continuous development and improvement of technology of other types of materials (such as PE pipes, etc.), traditional PVC pipes do not have too many advantages compared with emerging plastic pipes in terms of various performance indicators. In addition, they inherently exist in PVC pipes. With the disadvantage of low toughness, the redevelopment of PVC pipes has become the only way for PVC pipes to win competition in the plastics market.

PVC-O, the Chinese name biaxially oriented polyvinyl chloride, is the latest evolutionary form of PVC pipes. The pipes manufactured through a special oriented processing process will be stretched axially and radially by the PVC-U pipe produced by the extrusion method. Stretching makes the long-chain PVC molecules in the pipe arranged biaxially to obtain a new type of PVC pipe with high strength, high toughness, high impact resistance and fatigue resistance.

Biaxially oriented PVC pipes have improved the poor toughness and impact resistance of PVC-U pipes to a certain extent, but the improvement in toughness and impact resistance is not obvious, and there is a problem of poor heat resistance, which limits The scope of application of PVC pipes.

Summary of the invention

In order to overcome the above-mentioned problems in the prior art, the present invention proposes a preparation method and application of a special material for PVC-O pipes.

The technical solution adopted by the present invention to solve its technical problems is: a preparation method and application of a special material for PVC-O pipes, which is composed of the following parts by weight: 100 parts of PVC resin, 10-20 parts of elastomer toughening agent, Heat stabilizer 1-7 parts, lubricant 0.6-4 parts.

The above-mentioned preparation method and application of a special material for PVC-O pipe material, the elastomer toughening agent is made by grafting polar monomers MMA and AN with EPDM rubber, and the preparation method of the elastomer toughening agent To: Dissolve EPDM rubber in a solvent, add MMA and AN comonomers under low-speed stirring, add initiator after mixing uniformly, add the dispersant aqueous solution dropwise after 10 minutes, add dropwise within 15 minutes, add dropwise under high-speed stirring Distilled water, bubbling with nitrogen for 15 minutes, heating to 80° C., reacting for 20 hours and then reducing to room temperature, washing and drying to obtain elastomer toughening agent.

The above-mentioned preparation method and application of a special material for PVC-O pipes, the heat stabilizer is an organotin heat stabilizer.

The preparation method and application of the above-mentioned special material for PVC-O pipes, the lubricant is one or more of stearic acid, stearate and PE wax.

The preparation method and application of the above-mentioned special material for PVC-O pipe material. The preparation method of the special material for PVC-O pipe material is: mixing PVC resin and elastomer toughening agent on a two-roll mill at a roller temperature of 160°C. After mixing, heat stabilizer and lubricant are added after mixing, and the raw materials are mixed uniformly to obtain a blend.

The beneficial effect of the present invention is that the addition of elastomer toughening agent significantly improves the toughness and impact resistance of PVC-O pipes, and broadens its application range; and graft-modified EPDM rubber is used as the elastomer toughening agent , While increasing the toughness and impact resistance of PVC-O pipes, it can improve the aging resistance of PVC-O pipes and increase the service life of PVC-O pipes; and the present invention finds the preparation of graft-modified ternary B The best mass fraction of EPDM and MMA-AN for propylene rubber is of great significance to actual production and has strong practicability.

Description of the drawings

The present invention will be further described below in conjunction with the drawings and embodiments.

Figure 1 is the SEM image of the impact section morphology of the comparative example, embodiment 2 and embodiment 3 of the present invention;

2 is a TEM image of the phase structure of the blends of Example 2 and Example 3 of the present invention.

In the figure, A. Comparative Example, B. Example 2, C. Example 3.

detailed description

To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[Example 1]

A preparation method and application of a special material for PVC-O pipes is composed of the following parts by weight: 100 parts of PVC resin, 15 parts of elastomer toughening agent, 2 parts of heat stabilizer, and 1.2 parts of lubricant.

Further, the elastomer toughening agent is made by grafting polar monomers MMA and AN on EPDM rubber. The preparation method of the elastomer toughening agent is: dissolving EPDM rubber in a solvent, Add MMA and AN comonomers under low-speed stirring, add 0.8 parts of initiator after mixing uniformly, add the dispersant aqueous solution dropwise after 10 minutes, and the dropwise addition is completed within 15 minutes, add distilled water dropwise under high-speed stirring, and heat up to 80°C after nitrogen gas for 15 minutes After reacting for 20 hours, it is lowered to room temperature, washed and dried to obtain elastomer toughening agent.

Further, the heat stabilizer is an organotin heat stabilizer.

Further, the lubricant is stearic acid.

[Example 2]

The composition of the special material for PVC-O pipes includes the following parts by weight: 100 parts of PVC resin, 15 parts of elastomer toughening agent prepared in Example 1, 2 parts of organotin heat stabilizer, 1.2 parts of stearic acid, preparation implementation For the elastomer toughening agent in Example 1, the mass ratio of EPDM to MMA-AN is 50/50.

[Example 3]

The composition of the special material for PVC-O pipes includes the following parts by weight: 100 parts of PVC resin, 15 parts of elastomer toughening agent prepared in Example 1, 2 parts of organotin heat stabilizer, 1.2 parts of stearic acid, preparation implementation For the elastomer toughening agent in Example 1, the mass ratio of EPDM to MMA-AN is 60/40.

[Comparative ratio]

The composition of the PVC-O pipe material in the comparative example includes the following components by weight: 100 parts of PVC resin, 2 parts of organic tin heat stabilizer, and 1.2 parts of stearic acid.

[Application example]

The components of the PVC-O pipe materials in Example 2, Example 3 and the comparative example were mixed on a two-roll mill at a roller temperature of 160°C to obtain a blend, which was then heated at 170°C on a flat vulcanizer. Next, press it into a sheet of a certain specification, and perform performance testing after cold pressing.

Table 1 Notched impact strength test of Examples and Comparative Examples

To	standard test	Notched impact strength/KJ·m -2
Example 2	GB/T1843-2008	89.5
Example 3	GB/T1843-2008	39
Comparison	GB/T1843-2008	30

It can be clearly seen from the notched impact strength data and electron microscope photos that the special material for PVC-O pipes proposed by the present invention can significantly improve the toughness and impact resistance of PVC-O pipes, and when preparing elastomeric tougheners, EPDM When the mass ratio of rubber to MMA-AN is 50/50, the obtained blend PVC has the best compatibility with the elastomer toughening agent, and has the best toughness and impact resistance.

The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions should also be regarded as falling within the protection scope of the present invention.

Claims (5)

1. A preparation method and application of a special material for PVC-O pipes, which is characterized in that it is composed of the following parts by weight: 100 parts of PVC resin, 10-20 parts of elastomer toughening agent, 1-6 parts of heat stabilizer, lubricating Agent 0.6 to 4 parts.
2. The preparation method and application of a special PVC-O pipe material according to claim 1, wherein the elastomer toughening agent is made by grafting polar monomers MMA and AN with EPDM rubber. The preparation method of the elastomer toughening agent is: dissolving EPDM rubber in a solvent, adding MMA and AN comonomers under low-speed stirring, adding the initiator after mixing uniformly, adding the dispersant aqueous solution dropwise after 10 minutes, within 15 minutes After the addition is completed, distilled water is added dropwise under high-speed stirring, the temperature is raised to 80°C after 15 minutes of nitrogen gas, and the temperature is reduced to room temperature after 20 hours of reaction, and the elastomer toughener is obtained by washing and drying.
3. The preparation method and application of a special material for PVC-O pipes according to claim 1, wherein the heat stabilizer is an organotin heat stabilizer.
4. The preparation method and application of a special material for PVC-O pipes according to claim 1, wherein the lubricant is one or more of stearic acid, stearate and PE wax.
5. The preparation method and application of a special material for PVC-O pipes according to claim 1, wherein the preparation method of the special material for PVC-O pipes is as follows: Kneading on an open mill at a roller temperature of 160°C, adding heat stabilizers and lubricants after mixing uniformly, and mixing the raw materials uniformly to obtain a blend.

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