PPR plastic pipe with self-repairing function and preparation method thereof

Abstract

The invention relates to a PPR plastic pipe with a self-repairing function and a preparation method thereof and belongs to the field of PPR pipe preparation. According to the preparation method of thePPR plastic pipe with the self-repairing function, the preparation method of the PPR plastic pipe includes the following steps that a, polyacrylic acid and poly allylamine hydrochloride are mixed uniformly into a mixed solution, the interlayer inner wall of an inner pipe body and an outer pipe body of the PPR plastic pipe are uniformly coated with the mixed solution, film forming is performed through thermal crosslinking, and the coated PPR pipe is obtained; and b, self-repairing micro capsules and light-blocking filler are mixed, an interlayer of the inner pipe body and the outer pipe body of the coated PPR pipe is filled with the mixed self-repairing micro capsules and light-blocking filler, and the PPR plastic pipe with the self-repairing function is prepared. After cracking happens tothe prepared the PPR plastic pipe, cracks can be fast repaired, pipe blasting is prevented, and the service life of the pipe is prolonged.

Description

Technical field

[0001] The invention relates to a PPR plastic pipe with a self-repair function and a preparation method thereof, and belongs to the field of PPR pipe preparation. Background technique

[0002] PP-R (polypropylene random) pipe, also known as type three polypropylene pipe and also known as random copolymer polypropylene pipe or PPR pipe, has the advantages of energy saving, material saving, environmental protection, light weight and high strength, corrosion resistance, smooth inner wall without scaling, construction and The advantages of simple maintenance and long service life are widely used in construction, municipal, industrial and agricultural fields such as building water supply and drainage, urban and rural water supply and drainage, urban gas, electric power and optical cable sheath, industrial fluid transportation, agricultural irrigation, etc. PP-R pipes are made of random copolymer polypropylene through extrusion to form pipes, and injection molding to fo...

Examples

Embodiment 1

[0039] Example 1 Preparation of PPR plastic pipe with self-repair function

[0040] (1) Preparation of self-repairing microcapsules

[0041] Ⅰ. Mix urea and formaldehyde in a stirring environment. The weight ratio of urea to formaldehyde is 1:1.5. After the urea is completely dissolved, the pH of the reaction system is adjusted to 8.5 with sodium hydroxide, heated to 70°C, and reacted for 1.5 hours to obtain Urea-formaldehyde resin prepolymer;

[0042] Ⅱ. Add emulsifier, resorcinol and cyclopentadiene to the urea-formaldehyde resin prepolymer obtained above, and disperse it at 500r / min for 20min to form a stable oil-in-water emulsion;

[0043] Ⅲ. Then adjust the pH of the reaction system to 4~5 with dilute hydrochloric acid, heat up to 65°C, react for 2.5h, cool to room temperature, filter with suction, and dry to obtain self-repairing microcapsules.

[0044] (2) Preparation of PPR plastic pipe with self-repair function

[0045] a. Mix 1 part by weight of polyacrylic acid and 1.2 parts ...

Embodiment 2

[0047] Example 2 Preparation of PPR plastic pipe with self-repair function

[0048] (1) Preparation of self-repairing microcapsules

[0049] Ⅰ. Mix urea and formaldehyde in a stirring environment. The weight ratio of urea to formaldehyde is 1:1.8. After the urea is completely dissolved, adjust the pH of the reaction system to 8-9 with sodium hydroxide, heat up to 72°C, and react for 1.8h , Get urea-formaldehyde resin prepolymer;

[0050] Ⅱ. Add emulsifier, resorcinol and cyclopentadiene to the urea-formaldehyde resin prepolymer obtained above, and disperse it at 500r / min for 20min to form a stable oil-in-water emulsion;

[0051] Ⅲ. Then adjust the pH of the reaction system to 4~5 with dilute hydrochloric acid, heat up to 68°C, react for 2.8 hours, cool to room temperature, filter and wash with suction, and dry to obtain self-repairing microcapsules.

[0052] (2) Preparation of PPR plastic pipe with self-repair function

[0053] a. Mix 1 part by weight of polyacrylic acid and 1.2 parts b...

Embodiment 3

[0055] Example 3 Preparation of PPR plastic pipe with self-repair function

[0056] (1) Preparation of self-repairing microcapsules

[0057] Ⅰ. Mix urea and formaldehyde in a stirring environment. The weight ratio of urea to formaldehyde is 1:1.2. After the urea is completely dissolved, adjust the pH of the reaction system to 8-9 with sodium hydroxide, heat up to 68°C, and react for 1.2h , Get urea-formaldehyde resin prepolymer;

[0058] Ⅱ. Add emulsifier, resorcinol and cyclopentadiene to the urea-formaldehyde resin prepolymer obtained above, and disperse it at 500r / min for 20min to form a stable oil-in-water emulsion;

[0059] Ⅲ. Then adjust the pH of the reaction system to 4~5 with dilute hydrochloric acid, heat up to 68°C, react for 2.5 hours, cool to room temperature, filter with suction, and dry to obtain self-repairing microcapsules.

[0060] (2) Preparation of PPR plastic pipe with self-repair function

[0061] a. Mix 1 part by weight of polyacrylic acid and 1.1 parts by weight ...

Technical field

[0001] The invention relates to a PPR plastic pipe with a self-repair function and a preparation method thereof, and belongs to the field of PPR pipe preparation. Background technique

[0002] PP-R (polypropylene random) pipe, also known as type three polypropylene pipe and also known as random copolymer polypropylene pipe or PPR pipe, has the advantages of energy saving, material saving, environmental protection, light weight and high strength, corrosion resistance, smooth inner wall without scaling, construction and The advantages of simple maintenance and long service life are widely used in construction, municipal, industrial and agricultural fields such as building water supply and drainage, urban and rural water supply and drainage, urban gas, electric power and optical cable sheath, industrial fluid transportation, agricultural irrigation, etc. PP-R pipes are made of random copolymer polypropylene through extrusion to form pipes, and injection molding to fo...

Examples

Embodiment 1

[0039] Example 1 Preparation of PPR plastic pipe with self-repair function

[0040] (1) Preparation of self-repairing microcapsules

[0041] Ⅰ. Mix urea and formaldehyde in a stirring environment. The weight ratio of urea to formaldehyde is 1:1.5. After the urea is completely dissolved, the pH of the reaction system is adjusted to 8.5 with sodium hydroxide, heated to 70°C, and reacted for 1.5 hours to obtain Urea-formaldehyde resin prepolymer;

[0042] Ⅱ. Add emulsifier, resorcinol and cyclopentadiene to the urea-formaldehyde resin prepolymer obtained above, and disperse it at 500r / min for 20min to form a stable oil-in-water emulsion;

[0043] Ⅲ. Then adjust the pH of the reaction system to 4~5 with dilute hydrochloric acid, heat up to 65°C, react for 2.5h, cool to room temperature, filter with suction, and dry to obtain self-repairing microcapsules.

[0044] (2) Preparation of PPR plastic pipe with self-repair function

[0045] a. Mix 1 part by weight of polyacrylic acid and 1.2 parts ...

Embodiment 2

[0047] Example 2 Preparation of PPR plastic pipe with self-repair function

[0048] (1) Preparation of self-repairing microcapsules

[0049] Ⅰ. Mix urea and formaldehyde in a stirring environment. The weight ratio of urea to formaldehyde is 1:1.8. After the urea is completely dissolved, adjust the pH of the reaction system to 8-9 with sodium hydroxide, heat up to 72°C, and react for 1.8h , Get urea-formaldehyde resin prepolymer;

[0050] Ⅱ. Add emulsifier, resorcinol and cyclopentadiene to the urea-formaldehyde resin prepolymer obtained above, and disperse it at 500r / min for 20min to form a stable oil-in-water emulsion;

[0051] Ⅲ. Then adjust the pH of the reaction system to 4~5 with dilute hydrochloric acid, heat up to 68°C, react for 2.8 hours, cool to room temperature, filter and wash with suction, and dry to obtain self-repairing microcapsules.

[0052] (2) Preparation of PPR plastic pipe with self-repair function

[0053] a. Mix 1 part by weight of polyacrylic acid and 1.2 parts b...

Embodiment 3

[0055] Example 3 Preparation of PPR plastic pipe with self-repair function

[0056] (1) Preparation of self-repairing microcapsules

[0057] Ⅰ. Mix urea and formaldehyde in a stirring environment. The weight ratio of urea to formaldehyde is 1:1.2. After the urea is completely dissolved, adjust the pH of the reaction system to 8-9 with sodium hydroxide, heat up to 68°C, and react for 1.2h , Get urea-formaldehyde resin prepolymer;

[0058] Ⅱ. Add emulsifier, resorcinol and cyclopentadiene to the urea-formaldehyde resin prepolymer obtained above, and disperse it at 500r / min for 20min to form a stable oil-in-water emulsion;

[0059] Ⅲ. Then adjust the pH of the reaction system to 4~5 with dilute hydrochloric acid, heat up to 68°C, react for 2.5 hours, cool to room temperature, filter with suction, and dry to obtain self-repairing microcapsules.

[0060] (2) Preparation of PPR plastic pipe with self-repair function

[0061] a. Mix 1 part by weight of polyacrylic acid and 1.1 parts by weight ...