Preparing method of bamboo fiber winding composite tube

A bamboo fiber and composite pipe technology, applied in the pipeline field, can solve the problems of oil resource consumption, environmental pollution, etc., and achieve the effects of saving oil resources, high strength, and improving compactness

Inactive Publication Date: 2009-11-04

XINJIANG GUANGSHUI PIPE

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AI-Extracted Technical Summary

Problems solved by technology

Therefore, the use of the above-mentioned pipeline products consumes a larg...

Abstract

The invention discloses a preparing method of a bamboo fiber winding composite tube. The existing polyvinyl chloride tubes, polyethylene tubes, glass steel tubes and glass steel sand tubes consume a great amount of petroleum resources, and pollute environments. The invention provides the preparing method of the bamboo fiber winding composite tube. The preparing method comprises the following steps: preparing an inner liner layer; pre-treating bamboo fiber, connecting the bamboo fiber into a continuous bamboo fiber strip by a method of liner cloth adhesion or sewing or weaving, and rolling the bamboo fiber strip into a roll; preparing a reinforcing layer, installing the coiled bamboo fiber strip on a winding machine to unwind, coating resin on the bamboo fiber strip through a resin tank, winding the bamboo fiber strip on an inner liner layer of a straight tube mould more than two circles, and forming the reinforcing layer after curing; preparing an outer protective layer. The preparing method uses the winding machine to perform the machine production, so the production efficiency is high, the compactness of the bamboo fiber is enhanced, and the strength of the product is enhanced.

Application Domain

Liquid surface applicatorsVeneer manufacture +2

Technology Topic

Steel tubePre treatment +7

Image

Examples

Experimental program(6)

Example Embodiment

[0019] Example 1:

[0020] Taking the production of a bamboo composite pipe with a diameter of 200mm as an example, the specific steps are as follows:

[0021] a) bamboo chip pretreatment:

[0022] Open the fresh moso bamboo into 5 meters long, 0.7mm thick and 10mm wide bamboo slices, soak them in 5% NaOH solution for 6 hours, rinse them with water, and after drying, arrange them in a row with 9 bamboo slices 11 in parallel. The longitudinal direction is arranged in several rows successively, and the cotton yarn mesh cloth 12 (60g/m2) coated with urea-formaldehyde resin is lined on the back 2 ), solidified by pressing at 120°C for 5 minutes to form a bamboo strip with a width of 90 mm and a thickness of 0.8 mm (see figure 2 ), forming an uninterrupted strip of bamboo strips with a length of more than 50 meters, and rolled onto a reel for use;

[0023] b) Preparation of inner lining layer 1:

[0024] A 0.029mm thick polyester film is coated on a polished steel straight pipe mold with an outer diameter of 200mm, and a vinyl ester resin with excellent anti-corrosion properties and a glass fiber surface mat (30g/m 2 ) making an inner liner with a thickness of 2mm on the straight pipe mold;

[0025] c) Winding process (i.e. preparation of reinforcement layer 2):

[0026] After the inner liner is cured, put the pre-rolled bamboo cloth tape on the winding machine, unroll the bamboo cloth tape, dip it into the resin tank to soak in the urea-formaldehyde resin, and then wrap it on the straight pipe mold evenly. 1 layer of hoop/2 layers of helix/1 layer of hoop backward, reaching a design thickness of 6mm; after winding, heat the pipe to 60°C and cure for 20 minutes. After the resin is cross-linked and cured, it becomes a hard and integrated thermosetting composite material.

[0027] d) Preparation of the outer protective layer 3:

[0028] Paint a layer of waterproof and anti-corrosion epoxy resin on the outside of the pipe, with a thickness of about 0.5-1mm.

[0029] The pipeline produced in Example 1 was tested by hydraulic pressure, the short-term failure pressure reached 5.2MPa, the measured total thickness was 8.5mm, and the stiffness reached 16200N/m 2 , the hoop tensile strength reaches 520KN/m, which is higher than that of polyvinyl chloride and polyethylene pipes, and reaches the technical index of FRP pipes. The specific gravity of the solid pipe body is 0.87, which is lower than the 1.8-2.1 of the glass steel pipe.

Example Embodiment

[0030] Example 2:

[0031] Taking the production of a bamboo composite pipe with a diameter of 300mm as an example, the specific steps are as follows:

[0032] a) bamboo chip pretreatment:

[0033] Fresh moso bamboo is opened into 5 meters long, 1.3mm thick, 14mm wide bamboo chips, soaked with 8% NaOH solution at 60°C for 8 hours, rinsed with water, and dried. Arrange in parallel with 8 bamboo slices 21 into a row, arrange multiple rows successively along the longitudinal direction, sew up with sutures 22 at every 30cm distance in the longitudinal direction, and the suture stitches become perpendicular to the bamboo slices (see image 3 ). After the bamboo slices are stitched, form a continuous strip of bamboo slices with a width of 120mm, a thickness of 1.3mm, and a length of more than 50 meters, and roll it onto a roll for use;

[0034] b) Preparation of inner lining:

[0035] Coated a layer of 0.029mm thick polyester film on a polished steel straight tube mold with an outer diameter of 300mm, with food grade resin and polyester surface felt (30g/m 2 ) Make an inner liner with a thickness of 2mm on the straight pipe mold;

[0036] c) winding process:

[0037] After the inner liner is cured, put the pre-rolled bamboo strips on the winding machine, unwind the bamboo strips, immerse them in the resin tank to soak in unsaturated polyester resin, and then wrap them on the straight pipe mold evenly, and wind 1 layer of hoop/2 layers of helix/1 layer of hoop backward, reaching a design thickness of 8mm; after winding, a layer of polyester film with a thickness of 0.029mm is coated on the outermost layer to make the surface of the tube body smooth. Curing at a temperature above 20°C for 60 minutes, after the resin is cross-linked and cured, it becomes a hard and integrated thermosetting composite material.

[0038] d) Preparation of the outer protective layer:

[0039] Paint a layer of vinyl ester resin with good waterproof and anticorrosion on the outside of the pipe, with a thickness of about 0.5mm.

[0040] The pipeline produced in Example 2 was tested by hydraulic pressure, and the short-term failure pressure reached 4.6MPa, the measured total thickness was 10.5mm, and the measured stiffness reached 13200N/m 2 , the hoop tensile strength reaches 713KN/m, which is higher than that of polyvinyl chloride and polyethylene pipes, and reaches the technical index of FRP pipes. The measured specific gravity of the pipe body material is 0.84, which is lower than the 1.8-2.1 of the glass steel pipe.

Example Embodiment

[0041] Example 3:

[0042] Taking the production of a bamboo composite pipe with a diameter of 300mm as an example, the specific steps are as follows:

[0043]a) bamboo chip pretreatment:

[0044] Cut fresh moso bamboo into 140 mm long, 1.0 mm thick, and 12 mm wide bamboo slices, soak them in 5% NaOH solution for 6 hours, rinse them with water, and dry them. Weave into the wide bamboo mat band of 110mm in the mode that bamboo sheet 31 intersects each other, and in this bamboo mat band, latitude and longitude bamboo sheet and bamboo mat band are the angle of 45 ° (see Figure 4 ). The woven bamboo mat is in the form of a continuous strip with a thickness of 2mm and a length of more than 50 meters, and rolled onto a drum for use;

[0045] b) Preparation of inner lining:

[0046] Coated a layer of 0.029mm thick polyester film on a polished steel straight tube mold with an outer diameter of 300mm, with food grade resin and polyester surface felt (30g/m 2 ) making an inner liner with a thickness of up to 2mm on the pipe mould;

[0047] c) winding process:

[0048] After the inner liner is cured, install the pre-rolled bamboo mat tape on the winding machine, unroll the bamboo mat tape, dip it into the resin tank to soak in the urea-formaldehyde resin, and then wrap it on the straight pipe mold evenly, winding 5 layers Hoop backwards to a design thickness of 10mm. Curing at a temperature above 60°C for 30 minutes, after the resin is cross-linked and cured, it becomes a hard and integrated thermosetting composite material.

[0049] d) Preparation of the outer protective layer:

[0050] Paint a layer of waterproof and anti-corrosion polyurethane resin on the outside of the pipe, with a thickness of about 0.5mm.

[0051] The pipeline produced in Example 3 was tested by hydraulic pressure, and the short-term failure pressure reached 4.9MPa, the measured total thickness was 12.2mm, and the measured stiffness reached 42300N/m 2 , the circumferential tensile strength reaches 735KN/m, and the axial tensile strength reaches 590KN/m, which is higher than that of polyvinyl chloride and polyethylene pipes, and reaches the technical index of FRP pipes. The measured specific gravity of the pipe body material is 0.88, which is lower than the 1.8-2.1 of the glass steel pipe.

PUM

Property	Measurement	Unit
Length	50.0	m
Diameter	200.0	mm
Thickness	8.5	mm

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Preparing method of bamboo fiber winding composite tube

A bamboo fiber and composite pipe technology, applied in the pipeline field, can solve the problems of oil resource consumption, environmental pollution, etc., and achieve the effects of saving oil resources, high strength, and improving compactness

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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