CROSS-LINKED POLYETHYLENE TYPE A (PEX-A) PIPE

Abstract

The present disclosure discloses a PEX-A pipe, the pipe wall of the PEX-A pipe includes a PEX-A antibacterial layer, a PEX-A main body layer, and an anti-ultraviolet (UV) layer that are sequentially attached from inside to outside. The anti-UV layer is attached to the outer side of the PEX-A main body layer to enhance the weather resistance and aging resistance and prolong the service life of the pipe. The PEX-A antibacterial layer is attached to the inner side of the PEX-A main body layer to inhibit the growth and reproduction of bacteria in water in the pipe and improve the quality of drinking water.

Claims

1. A cross-linked polyethylene type A (PEX-A) pipe, wherein a pipe wall of the PEX-A pipe comprises a PEX-A antibacterial layer (1), a PEX-A main body layer (2), and an anti-ultraviolet (UV) layer (3) from inside to outside, wherein the PEX-A antibacterial layer (1) is attached to the PEX-A main body layer (2), and the PEX-A main body layer (2) is attached to the anti-UV layer (3).

2. The PEX-A pipe according to claim 1, wherein the PEX-A antibacterial layer (1), the PEX-A main body layer (2), and the anti-UV layer (3) have a thickness ratio of (1-3):(9-11):(0.5-1).

3. The PEX-A pipe according to claim 1, wherein materials for the PEX-A antibacterial layer (1) are PEX-A and an antibacterial agent.

4. The PEX-A pipe according to claim 1, wherein a material for the PEX-A main body layer (2) is PEX-A.

5. The PEX-A pipe according to claim 1, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.

6. The PEX-A pipe according to claim 2, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.

7. The PEX-A pipe according to claim 3, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.

8. The PEX-A pipe according to claim 4, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a schematic structural diagram for the PEX-A pipes of Examples 1 to 3 and Comparative Example 1, where 1 denotes a PEX-A antibacterial layer, 2 denotes a PEX-A main body layer, and 3 denotes an anti-UV layer.

[0015] FIG. 2 is a schematic structural diagram for the PEX-A pipe of Comparative Example 1, where 4 denotes an antibacterial layer and 5 denotes a protective layer.

DETAILED DESCRIPTION

[0016] In order to better illustrate the objectives, technical solutions, and advantages of the present disclosure, the present disclosure will be further described below in conjunction with specific examples. It should be understood by those skilled in the art that the described specific examples are merely used to explain the present disclosure, rather than to limit the present disclosure.

[0017] In the examples, unless otherwise specified, the experimental methods used are conventional, and the materials and reagents used are commercially available.

EXAMPLE 1

[0018] As shown in FIG. 1, the pipe wall of the PEX-A pipe in this example includes a PEX-A antibacterial layer 1, a PEX-A main body layer 2, and an anti-UV layer 3 sequentially from inside to outside, and the PEX-A antibacterial layer 1, the PEX-A main body layer 2, and the anti-UV layer 3 have a thickness ratio of 1:9:0.5. The PEX-A antibacterial layer 1 is attached to the PEX-A main body layer 2, which is in turn attached to the anti-UV layer 3.

[0019] Materials for the PEX-A antibacterial layer 1 are PEX-A and an antibacterial agent; a material for the PEX-A main body layer 2 is PEX-A; and materials for the anti-UV layer 3 are PE, an anti-UV additive, and an antioxidant.

EXAMPLE 2

[0020] As shown in FIG. 1, the pipe wall of the PEX-A pipe in this example includes a PEX-A antibacterial layer 1, a PEX-A main body layer 2, and an anti-UV layer 3 sequentially from inside to outside, and the PEX-A antibacterial layer 1, the PEX-A main body layer 2, and the anti-UV layer 3 have a thickness ratio of 2:10:1. The PEX-A antibacterial layer 1 is attached to the PEX-A main body layer 2, which is in turn attached to the anti-UV layer 3.

[0021] Materials for the PEX-A antibacterial layer 1 are PEX-A and an antibacterial agent; a material for the PEX-A main body layer 2 is PEX-A; and materials for the anti-UV layer 3 are PE, an anti-UV additive, and an antioxidant.

EXAMPLE 3

[0022] As shown in FIG. 1, the pipe wall of the PEX-A pipe in this example includes a PEX-A antibacterial layer 1, a PEX-A main body layer 2, and an anti-UV layer 3 sequentially from inside to outside, and the PEX-A antibacterial layer 1, the PEX-A main body layer 2, and the anti-UV layer 3 have a thickness ratio of 3:11:1. The PEX-A antibacterial layer 1 is attached to the PEX-A main body layer 2, which is in turn attached to the anti-UV layer 3.

[0023] Materials for the PEX-A antibacterial layer 1 are PEX-A and an antibacterial agent; a material for the PEX-A main body layer 2 is PEX-A; and materials for the anti-UV layer 3 are PE, an anti-UV additive, and an antioxidant.

COMPARATIVE EXAMPLE 1

[0024] As shown in FIG. 1, the pipe wall of the PEX-A pipe in this example includes a PEX-A antibacterial layer 1, a PEX-A main body layer 2, and an anti-UV layer 3 sequentially from inside to outside, and the PEX-A antibacterial layer 1, the PEX-A main body layer 2, and the anti-UV layer 3 have a thickness ratio of 1:12:1. The PEX-A antibacterial layer 1 is attached to the PEX-A main body layer 2, and the PEX-A main body layer 2 is attached to the anti-UV layer 3.

[0025] Materials for the PEX-A antibacterial layer 1 are PEX-A and an antibacterial agent; a material for the PEX-A main body layer 2 is PEX-A; and materials for the anti-UV layer 3 are PE, an anti-UV additive, and an antioxidant.

COMPARATIVE EXAMPLE 2

[0026] As shown in FIG. 2, the pipe wall of the PEX-A pipe in this comparative example includes an antibacterial layer 4 and a protective layer 5 sequentially from inside to outside, and the antibacterial layer 4 and the protective layer 5 are bonded together by a binder. Materials for the antibacterial layer 4 are PEX-A and an antibacterial agent, and materials for the protective layer 5 are PEX-A and an antioxidant. The antibacterial layer 4 and the protective layer 5 have a thickness ratio of 1:9.

[0027] The antibacterial performance and weather resistance of the PEX-A pipes obtained in the examples and comparative examples above were tested. The antibacterial rate, which was calculated using the experimental techniques provided in JC/T 939-2004, reflected the antibacterial performance. The elongation at break of the sample, which was measured using exposure cycles in accordance with GB/T 16422.3, reflected the weather resistance. Specific test results were shown in Table 1.

TABLE-US-00001 TABLE 1 Group Antibacterial rate Elongation at break Example 1 99.99% 395% Example 2 99.99% 529% Example 3 99.99% 476% Comparative Example 1  99.0% 466% Comparative Example 2  99.9% 320%

[0028] It can be seen from the above results that the PEX-A antibacterial layer and the anti-UV layer could enhance both the antibacterial performance and the weather resistance of the PEX-A pipe. The PEX-A antibacterial layer could inhibit bacterial growth and reproduction in the water within the pipe. The anti-UV layer could enhance the weather resistance and aging resistance of the pipe, thus extending the service life of the pipe. In addition, by adjusting the thickness ratio of the PEX-A antibacterial layer, the PEX-A main body layer, and the anti-UV layer, the antibacterial performance and aging resistance of the pipe can be modified accordingly. In particular, when the PEX-A antibacterial layer, the PEX-A main body layer, and the anti-UV layer have a thickness ratio of (1-3):(9-11):(0.5-1), a resulting PEX-A pipe is ensured to have both prominent aging resistance and prominent antibacterial performance.

[0029] Finally, it should be noted that the above examples are provided merely to describe the technical solutions of the present disclosure, rather than to limit the protection scope of the present disclosure. Although the present disclosure is described in detail with reference to preferred examples, a person of ordinary skill in the art should understand that modifications or equivalent replacements may be made to the technical solutions of the present disclosure without departing from the spirit and scope of the technical solutions of the present disclosure.