CN202266763U - Double-orientation fiber reinforcement random copolymerization polypropylene three-layer composite pipe - Google Patents

Abstract

The utility model relates to a double-orientation fiber reinforcement random copolymerization polypropylene three-layer composite pipe, which is characterized by comprising a random copolymerization polypropylene pipe wall outer layer (1), a random copolymerization polypropylene pipe wall inner layer (6) and a double-orientation fiber reinforcement layer. An annular fiber reinforcement layer (2) and an axial fiber reinforcement layer (3) are arranged between the random copolymerization polypropylene pipe wall outer layer (1) and the random copolymerization polypropylene pipe wall inner layer (6). The double-orientation fiber reinforcement random copolymerization polypropylene three-layer composite pipe has the advantages that by means of the annular fiber reinforcement layer, pressure resistant performance of pipes is improved; and by means of the axial fiber reinforcement layer, coefficient of linear expansion of the pipes is reduced. By adjusting length of a glass fiber, the coefficient of linear expansion can be reduced to one third to one fourth under the premise that the pressure resistant performance of the pipes is guaranteed. Fiber reinforcement layer resin utilizes toughing random copolymerization polypropylene so that low-temperature impact resistant performance of the pipes is improved. The double-orientation fiber reinforcement random copolymerization polypropylene three-layer composite pipe can be applied to cold and hot water pipes, building main vertical pipes and other industrial pipes.

Description

A double-oriented fiber-reinforced random copolymer polypropylene three-layer composite pipe

【Technical field】

The utility model relates to the technical field of pipe materials, in particular to a double-oriented fiber-reinforced random copolymerization polypropylene three-layer composite pipe.

【Background technique】

Random copolymer polypropylene (PP-R) pipes are accepted by the market because of their good application characteristics such as sanitation, environmental protection, and reliable hot-melt connection. And favored by domestic users. However, due to the large linear expansion coefficient of PP-R pipes in engineering applications, the pipes are easily deformed when used in hot water systems; when simple PP-R pipes are used in main risers, the compressive strength is slightly insufficient, etc., and many of the above defects This restricts the further popularization and application of PP-R pipes in my country's building water supply market. Simple axial fiber reinforcement of PP-R pipes can significantly reduce the linear expansion coefficient of the pipes, but reduce the hoop pressure resistance performance; while hoop fiber reinforcement of PP-R pipes can improve the pipe's Pressure resistance performance, but can not effectively reduce the linear expansion coefficient of the pipeline.

【Content of utility model】

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe.

The purpose of this utility model is achieved through the following technical solutions:

A double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe is characterized in that it comprises a random copolymerized polypropylene pipe wall outer layer (1) and a pipe wall inner layer (6) as well as a double-oriented fiber reinforced layer; the pipe Between the outer wall layer (1) and the inner layer of the pipe wall (6), there are double-layer reinforcement layers of circumferential fiber reinforcement (2) and axial fiber reinforcement (3);

The density range of the random copolymerized polypropylene: 0.9-1.2g/cm ³ , a resin with a melt index of 0.25-1.0g/10min;

The reinforcing fibers are glass fibers (4), the fiber mass percentage in each reinforcing layer is 20-30%, the fiber diameter is 13-16 μm, and the fiber length is 200-1000 μm;

The hoop fiber reinforced layer (2) and the axial fiber reinforced layer (3) account for 50-60% of the total pipe wall thickness, and the thickness ratio of the hoop fiber reinforced layer (2) to the axial fiber reinforced layer (3) is 2:1 ~1:2;

The compatibilizer MPP needs to be added during the preparation of the hoop fiber reinforced layer (2) and the axial fiber reinforced layer (3), and the compatibilizer accounts for 5%-10% by mass of the reinforced layer;

Tougheners, such as HDPE, LLDPE, EVA, PA, POE, PPB, etc., need to be added during the preparation of the hoop fiber reinforced layer (2) and the axial fiber reinforced layer (3). Among them, the selection range of LLDPE dosage is 5-20%, the selection range of HDPE dosage is 5-10%, the selection range of EVA dosage is 3-8%, the selection range of POE dosage is 5-15%; the selection range of PPB dosage is 50% %-80%.

The invention discloses a method for preparing a double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe, which can be prepared by extruding the pipe from two-way layers and then winding in two layers.

Compared with prior art, the positive effect of the utility model is:

The advantages of the double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe described in the utility model: the pressure resistance of the pipe is improved by introducing the circumferential fiber reinforcement layer; the introduction of the axial fiber reinforcement layer reduces the pressure resistance of the pipe Linear expansion coefficient. By adjusting the length of the glass fiber, the coefficient of linear expansion can be reduced to 1/3 to 1/4 under the premise of ensuring high pressure resistance of the pipe. The fiber-reinforced layer resin is made of toughened random copolymerized polypropylene, which improves the low-temperature impact resistance of the pipe. The utility model can be used for hot and cold water pipes, building main risers and other industrial pipes.

【Description of drawings】

Fig. 1 is the radial and axial sectional view of double-oriented fiber reinforced random copolymer polypropylene three-layer composite pipe; 1a is a radial sectional view, and 1b is an axial sectional view;

The labels in the accompanying drawings are: 1. The outer layer of random copolymerized polypropylene pipe wall; 2. The circumferential fiber reinforced polypropylene layer; 3. The axial fiber reinforced polypropylene layer; 4. Glass fiber; 6. Random copolymerized polypropylene inner layer.

【Detailed ways】

The following provides a specific embodiment of a double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe of the present invention.

Example 1

Please refer to accompanying drawing 1, a kind of double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe, including random copolymerized polypropylene pipe wall outer layer (1) and pipe wall inner layer (6) and double-oriented fiber-reinforced layer . It is characterized in that there are two layers of reinforcing layers of circumferential fiber reinforcement (2) and axial fiber reinforcement (3) between the pipe wall outer layer (1) and the pipe wall inner layer (6).

A double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe, the size of the pipe is φ90*10, the pipe wall is composed of 20% random copolymerized polypropylene outer layer, 20% random copolymerized polypropylene inner layer, 30% hoop fiber reinforcement, 30% axial fiber reinforcement. Wherein, the fiber content in both the hoop and axial fiber reinforced layers is 25%, the fiber length is 400μm-800μm, and 8% maleic anhydride grafted polypropylene (MPP) and 50% PPB are added. In this design pipe, the ratio of each layer is reasonable, and the fiber and resin have a good bonding effect, which significantly increases the transverse and longitudinal tensile properties of the pipe, and effectively improves the pressure resistance, temperature resistance, low temperature brittleness and brittleness of the pipe. Significantly lower the coefficient of linear expansion.

The above is only a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the concept of the present utility model. Should be regarded as within the scope of protection of the present utility model.

Claims (3)

1. A double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe is characterized in that it comprises a random copolymerized polypropylene pipe wall outer layer and a pipe wall inner layer and a double-oriented fiber reinforced layer; the pipe wall outer layer and the pipe wall inner layer; There is a double-layer reinforcement layer of hoop fiber reinforcement and axial fiber reinforcement between the inner layers of the pipe wall. 2. A double-oriented fiber-reinforced random copolymerized polypropylene three-layer composite pipe as claimed in claim 1, wherein said fibers are glass fibers. 3. A double-oriented fiber-reinforced random copolymer polypropylene three-layer composite pipe as claimed in claim 1, characterized in that the hoop-fiber-reinforced layer and the axial-fiber-reinforced layer account for 50-60% of the total pipe wall thickness , the thickness ratio of the hoop fiber reinforced layer (2) to the axial fiber reinforced layer (3) is 2:1˜1:2.

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