CN113817247A

CN113817247A - Novel glass fiber reinforced composite double-wall corrugated pipe and preparation method and application thereof

Info

Publication number: CN113817247A
Application number: CN202111027713.3A
Authority: CN
Inventors: 谢峰
Original assignee: Shandong Liansu Technology Industry Co ltd
Current assignee: Shandong Liansu Technology Industry Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2021-12-21

Abstract

The invention discloses a novel glass fiber reinforced composite double-wall corrugated pipe and a preparation method and application thereof, and the novel glass fiber reinforced composite double-wall corrugated pipe provided by the invention has the advantages that under the conditions of the same meter weight, the same pipe crest, the same size and the same structure, the ring stiffness can be improved by more than 70%, the impact property is obviously improved compared with the impact property of the novel glass fiber reinforced composite double-wall corrugated pipe which is prepared by adding and filling a pure PE material, the flexural modulus is improved by more than 30%, the flexural strength is improved by about 80%, and the tensile strength is improved by about 30%; the qualified rate of the prepared anti-impact agent of the pipe is improved by about 10 percent; in the same grade product, the composite corrugated pipe has the advantages of reduced meter weight and convenience for transportation, construction and installation. The novel composite pipe has the advantages that the shrinkage rate of the pipe is smaller than that of a PE double-wall corrugated pipe, the accurate flaring processing and size control are facilitated, and the creep resistance, the size stability and the heat resistance are better.

Description

Novel glass fiber reinforced composite double-wall corrugated pipe and preparation method and application thereof

Technical Field

The invention relates to the technical field of corrugated pipe materials, in particular to a novel glass fiber reinforced composite double-wall corrugated pipe and a preparation method and application thereof.

Background

In the existing market, municipal HDPE double-wall corrugated pipes have fierce competition, the traditional HDPE double-wall corrugated pipes are made of PE materials, but the modulus of the PE materials is low, generally 1000-1200 MPa, the rigidity of the manufactured municipal pipe rings is generally low, the wave bottoms are easy to stack, and if a large number of inorganic particles for increasing the rigidity are added, the impact performance and the tensile performance of the municipal pipe rings are poor. In addition, municipal products generally pay attention to lightweight design to improve the efficiency and the simplicity of construction, reduce the construction degree of difficulty. For example, chinese patent CN108976562A discloses a polyethylene double-wall corrugated pipe and a method for manufacturing the same, wherein the outer layer and the inner layer are made of polyethylene as a main material, and glass fiber, terpene resin, and calcium carbonate are added to the outer layer to improve the ring stiffness of the double-wall corrugated pipe, but the impact performance and tensile performance of the double-wall corrugated pipe are also reduced, and the goal of light weight is not achieved.

Disclosure of Invention

The invention aims to solve the technical problems that the existing double-wall corrugated pipe cannot have excellent impact performance and tensile performance and high ring stiffness at the same time, and the defects of light weight are overcome, and the novel glass fiber reinforced composite double-wall corrugated pipe is provided.

The invention also aims to provide a preparation method of the novel glass fiber reinforced composite double-wall corrugated pipe.

The invention also aims to provide application of the novel glass fiber reinforced composite double-wall corrugated pipe.

The above purpose of the invention is realized by the following technical scheme:

the novel glass fiber reinforced composite double-wall corrugated pipe comprises an outer layer and an inner layer, wherein the outer layer comprises the following components in parts by weight:

the master batch containing the glass fiber comprises the following components in parts by weight:

wherein the size of the chopped glass fiber is 5-15 mm; 3 MgO.4 SiO₂·H₂The grain diameter of O is 1000-5000 meshes;

the inner layer comprises the following components in parts by weight:

the invention selects the proper glass fiber material and 3 MgO.4SiO₂·H₂And O, preparing master batches containing glass fibers, adding the master batches into the outer layer of the novel glass fiber reinforced composite double-wall corrugated pipe, and selecting a mixture of the reinforced master batches and polyethylene as the inner layer. The strength and modulus of the material are improved by improving the mixed material on the outer layer, so that the wall thickness of the pipe with the same inner diameter is reduced by 10-20%, and the performance of the original wall thickness can be achieved, thereby achieving the light weight of the product, improving the ring stiffness of the material, and simultaneously keeping the high impact performance and the tensile performance of the material. Meanwhile, a large amount of inorganic materials such as glass fibers are added, so that the cooling and shaping time of the product is prolonged, and the production efficiency is improved. Meanwhile, due to the low shrinkage rate of the inorganic material, the shrinkage rate of the novel material product is greatly reduced, the mold design is facilitated, and the size of the product can be controlled more finely. Meanwhile, in the later use process of the product,the device is less sensitive to the change of the environmental temperature and the humidity, and reduces the water leakage risk of the pipe connection part caused by the change of the product yield and the like. The novel composite double-wall corrugated pipe improves the creep resistance and the dimensional stability and has good heat resistance.

The black master batch provided by the invention not only can be used for coloring, but also can be used for improving the overall aging resistance and ultraviolet resistance of the material.

Preferably, the grafting compatibilizer is PE grafted maleic anhydride (PE-g-MAH).

Preferably, the stearic acid is octadecanoic acid.

Preferably, the outer layer comprises the following components in parts by weight:

preferably, the master batch containing the glass fiber comprises the following components in parts by weight:

3 MgO.4SiO selected for use in the invention₂·H₂O also acts as a nucleating agent in the material.

Preferably, the size of the chopped glass fiber is 8-12 mm.

More preferably, the size of the chopped glass fiber is 10 mm.

Preferably, the 3 MgO.4SiO₂·H₂The particle size of O is 1000 to 2000 meshes.

Preferably, the 3 MgO.4SiO₂·H₂The particle size of O is 1500 meshes.

Preferably, the inner layer comprises the following components in parts by weight:

more preferably, the inner layer comprises the following components in parts by weight:

preferably, the coloring masterbatch contains carbon black 40 wt%.

Preferably, the stiffening material master batch is 3 MgO.4SiO₂·H₂O。

Preferably, the defoaming agent is an inorganic material mainly containing calcium oxide, wherein the content of the calcium oxide is 75 wt% to 85 wt%.

Preferably, the preparation method of the master batch containing the glass fiber comprises the following steps:

3 MgO.4 SiO₂·H₂O, chopped glass fiber, high-density polyethylene, linear low-density polyethylene, stearic acid, a grafting compatibilizer and oxidized polyethylene wax are uniformly mixed, extruded by a screw rod and cold-drawn into a material line, and granulated after water cooling to prepare the master batch containing the glass fiber.

The invention protects the preparation method of the novel glass fiber reinforced composite double-wall corrugated pipe, which comprises the following steps:

the components of the outer layer and the inner layer are prepared according to the proportion, then the components of the inner layer and the outer layer are respectively extruded by an inner layer extruder and an outer layer extruder, and are extruded and molded on a molding machine to continuously produce the novel glass fiber reinforced composite double-wall corrugated pipe.

The invention also protects the application of the novel glass fiber reinforced composite double-wall corrugated pipe in a drainage pipeline system, a communication pipeline system, a fresh air pipeline system or a drip irrigation system.

Compared with the prior art, the invention has the beneficial effects that:

the novel glass fiber reinforced composite double-wall corrugation provided by the invention has the advantages that under the conditions of the same meter weight and the same pipe wave crest, size and structure, the ring stiffness, the bending modulus, the bending strength and the tensile strength are improved, and the impact property is obviously improved compared with that of a pure PE material added with a filler; the qualification rate of the impact resistance of the pipe is high; in the same grade product, the composite corrugated pipe can be made lighter, the meter weight is reduced, and the composite corrugated pipe is beneficial to transportation, construction and installation. The shrinkage rate of the novel glass fiber reinforced composite double-wall corrugated pipe is smaller than that of a PE double-wall corrugated pipe, so that the novel glass fiber reinforced composite double-wall corrugated pipe is more favorable for accurate flaring processing and size control, and has good creep resistance, size stability and heat resistance.

Detailed Description

The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.

The raw materials used in the respective examples and comparative examples:

high Density Polyethylene (HDPE): material P600PE, and is produced in Korean oil.

1. Effect of the selection of the length of the chopped glass fibers on the Properties of the glass fiber-containing masterbatch

Preparing a master batch containing glass fibers, which comprises the following components in parts by weight:

45 parts of chopped glass fiber, 3 MgO.4SiO₂·H₂10 parts of O, 5 parts of a grafting compatibilizer, 5 parts of stearic acid, 2 parts of oxidized polyethylene wax, 30 parts of high-density polyethylene and 3 parts of linear low-density polyethylene.

The preparation method of the master batch containing the glass fiber comprises the following steps:

The sizes of the chopped glass fibers are 0mm, 5mm, 10mm and 15mm respectively; 3 MgO.4 SiO₂·H₂The grain diameter of O is 1500 meshes; master batches of 4 different chopped glass fiber lengths shown in table 1 were prepared.

Then, the prepared master batch containing the glass fibers with different lengths is selected to prepare an outer layer material for analytical research, and the following steps are adopted: 43 parts of glass fiber-containing master batch, 2 parts of black master batch, 50 parts of low-pressure polyethylene material and 5 parts of defoaming agent, and preparing the outer layer material and testing the mechanical property of the outer layer material.

TABLE 1 Effect of selection of chopped glass fiber length on glass fiber containing masterbatch Properties

As can be seen from Table 1, the elongation rate continues to decrease as the length of the glass fiber increases. The longer the glass fiber length is, the higher the flexural strength and flexural modulus of the material can be, but the processing difficulty is increased (high equipment requirements, high input cost and poor toughness of the material). On the contrary, the shorter the glass fiber length is, the smaller the reinforcing amplitude is, and the glass fiber can only play a role similar to the inorganic filler after being continuously shortened. Therefore, after comprehensive analysis, the glass fiber with the length of 10mm is finally selected as a subsequent test object in the research.

The masterbatch containing glass fibers was prepared from 10mm chopped glass fibers, the components of which are shown in table 2:

TABLE 2 compositions and percent contents of glass fiber-containing master batches

The preparation method of the master batch containing the glass fiber is the same as the above.

Mixing the prepared master batch containing the glass fibers with HDPE55 wt% according to the content of the master batch containing the glass fibers of 45 wt%, plasticizing by a double roller, pressing by a vulcanizing machine to prepare a sample plate suitable for detection, and performing a test method by using related detection equipment: (1) tensile strength, bending modulus: the test is carried out according to the national standard and the GB/T8804.3-2003 regulation, the tensile rate is 15mm/min, and the maximum tensile stress borne by the sample in the tensile test process is in MPa. The bending rate was 10 mm/min. The adopted instruments are as follows: electronic universal testing machines WTO-W, flat vulcanizing machines QLB 25-D/Q (Titanhua precision testing instruments factory), open rubber mixing mill SK-160 (Titanhua precision testing instruments factory). Performance data was detected as follows:

table 3 results of performance testing

After the comprehensive analysis, the sample No. 2 has the elongation of about 300% and the impact of about 15MPa, and has the best strength. Therefore, the formulation No. 2 was subsequently selected as the base formulation for preparing the glass fiber-containing master batch.

2. The novel glass fiber reinforced composite double-wall corrugated pipe prepared from the glass fiber-containing master batch prepared in the No. 2 method comprises the following components in parts by mass as shown in the following table 4:

TABLE 4 Components and their parts by weight in examples and comparative examples

The preparation method of the novel glass fiber reinforced composite double-wall corrugated pipe in each embodiment and the comparative example comprises the following steps:

s1, preparing a master batch containing glass fibers: after being evenly mixed according to the formula, the mixture is extruded and granulated by a double-screw extruder.

S2, preparing a novel glass fiber reinforced composite double-wall corrugated pipe: mixing the inner layer and the outer layer according to requirements, extruding through an inner layer extruder and an outer layer extruder respectively, extruding a pipe blank through a feeler, cooling through inner wall machine head vacuum and a water jacket, extruding and molding on a molding machine through outer wall module vacuum, and continuously producing the double-corrugated pipe.

The novel glass fiber reinforced composite double-wall corrugated pipe with the specification of dn300S8 is selected as a research object, and examples 1-3 and comparative examples 1-3 are respectively tested in sequence.

The mechanical property testing method comprises the following steps:

(1) tensile strength, bending modulus: the test is carried out according to the national standard and the GB/T8804.3-2003 regulation, the tensile rate is 15mm/min, and the maximum tensile stress borne by the sample in the tensile test process is in MPa. The bending rate was 10 mm/min. The adopted instruments are as follows: electronic universal testing machines WTO-W, flat vulcanizing machines QLB 25-D/Q (Titanhua precision testing instruments factory), open rubber mixing mill SK-160 (Titanhua precision testing instruments factory).

(2) Ring stiffness: a micro-control type ring stiffness tester WDT-H (Chengde precision tester Co., Ltd.) is adopted to carry out the test according to the GB/T9647-2003 regulation. When the DN/ID of the pipe is more than 500mm, a sample is cut from the pipe, the test is performed once by rotating 1200, and the arithmetic mean value of the three tests is taken.

Ring flexibility: with reference to the specification of GB/T9647-2003, the test is carried out according to ISO13968:1997, the test force is continuously increased and the test specimen is immediately unloaded when the deformation of the outer diameter d in the vertical direction is 30% of the original outer diameter. Judging that no part of the wall structure of the pipe is cracked in the detection process. The test data are summarized in Table 5 below.

TABLE 5 Performance test results for examples 1-3 and comparative examples 1-3

From the above table 5, it can be seen that the ring stiffness of the novel glass fiber reinforced composite double-wall corrugated pipe provided by the invention can be improved by more than 70% (according to the method standard of GB/T9647-2015) under the conditions of the same meter weight and the same pipe crest, size and structure, the ring stiffness meets the requirement, the impact performance is also obviously improved (according to the method standard of GB/T14152-2001) compared with the impact performance of the single PE material with filling, and the tensile strength is improved by about 30%; the qualified rate of the impact resistance of the manufactured pipe is improved by about 10 percent; the tensile property and the impact resistance are improved, and in the same grade product, the composite corrugated pipe can be lighter, the meter weight is reduced by 20-25%, the light weight is realized, and the composite corrugated pipe is beneficial to transportation, construction and installation. The novel glass fiber reinforced composite double-wall corrugated pipe has smaller shrinkage than a PE double-wall corrugated pipe, and is more favorable for accurate flaring processing and size control.

(3) Longitudinal retraction rate detection (detection test according to GB/T6671-2001 specified method B)

Three samples were taken from one tube. The test was carried out by uniformly cutting 4 pieces of the tube having a nominal diameter of 400mm or more in the axial direction. (the test temperature is 110 +/-2 ℃, the test time is 30min if e is less than or equal to 8mm, and 60min if e is more than 8 mm). The test sample is dn300SN8, and is tested at 110 + -2 deg.C for 30 min. The test procedure was as follows:

pretreatment: the sample was allowed to stand at (23 st 2) ℃ for at least 2 hours as specified in GB/T2918.

The test steps are as follows: the reticle spacing La was measured to the nearest 0.25mm at (23 st 2) ° C. The oven temperature was adjusted to the specified value in appendix a and the samples were placed in the oven so that the samples did not touch the oven floor and walls. If the specimen is suspended, the point of suspension should be at the end furthest from the gage line. If the sample is laid flat, it is placed on a flat plate padded with a layer of talc. The specimen is sliced so that the convex surface faces downward. The sample is placed in the oven for a defined period of time, which should be measured from the oven temperature back to the defined temperature, and the sample is removed from the oven, laid flat on a smooth surface, and after complete cooling to 23 ℃, the maximum or minimum distance L between the markings is measured along the generatrix on the surface of the sample to an accuracy of 25 mm. The slice-injection sample should have four slices per tube segment as one sample, L measured, and the slice should be measured while avoiding the influence of the incision edge. The test results are shown in table 6.

TABLE 6 results of longitudinal shrinkage test

Numbering

Example 1

Example 2

Example 3

Comparative example 1

Comparative example 2

Comparative example 3

First group

0.6％

0.8％

0.4％

2.8％

1.8％

0.3％

Second group

0.4％

0.6％

0.5％

2.3％

1.9％

0.3％

Third group

0.5％

0.7％

0.5％

2.6％

1.7％

0.4％

Mean value of

0.5％

0.7％

0.46％

2.57％

1.8％

0.33％

The results in table 6 show that the novel glass fiber reinforced composite double-wall corrugated pipe has good creep resistance and dimensional stability.

(4) Impact detection methods and standards, and data summarization:

the test is carried out according to the regulation of GB/T14152-2001, the test temperature is 0 +/-1 ℃, the mass of a punch hammer is 2.5kg of the mass of a drop hammer, and the test is carried out according to the impact height of 2000 mm. A V-shaped pallet is used.

TABLE 7 impact test results

Numbering

Example 1

Example 2

Example 3

Comparative example 1

Comparative example 2

Comparative example 3

The result of the detection

22/24 through

18/24 through

23/24 through

22/24 through

2/24 through

The results in table 7 show that the novel glass fiber reinforced composite double-wall corrugated pipe has good impact resistance.

(5) Oven detection methods and standards, and data summarization:

three sections of samples are cut from different positions in each group of samples, the test length is 300mm +/-20 mm, and then grouping number identification is carried out. And adjusting for 2h (under the environment of 23 ℃) and then carrying out oven detection.

And (3) raising the temperature of the oven to 110 ℃, putting the samples into each group, keeping the samples in the oven for 30min, taking out the samples, cooling the samples to room temperature, and checking whether the samples have cracks, delamination and other visible defects.

Table 8 heat resistance test results

Numbering

Example 1

Example 2

Example 3

Comparative example 1

Comparative example 2

Comparative example 3

The result of the detection

No abnormality

Inner and outer layer separation

The results in table 8 show that the novel glass fiber reinforced composite double-wall corrugated pipe has better heat resistance.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The novel glass fiber reinforced composite double-wall corrugated pipe is characterized by comprising an outer layer and an inner layer, wherein the outer layer comprises the following components in parts by weight:

wherein the size of the chopped glass fiber is 5-15 mm; 3 MgO.4 SiO₂·H₂Particle size of O1000-5000 meshes;

the inner layer comprises the following components in parts by weight:

2. the novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the outer layer comprises the following components in parts by weight:

3. the novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1 or 2, wherein the glass fiber-containing master batch comprises the following components in parts by weight:

4. the novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the size of the chopped glass fiber is 8-12 mm.

5. The novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the 3 MgO.4SiO is₂·H₂The particle size of O is 1000 to 2000 meshes.

6. The novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the outer layer comprises the following components in parts by weight:

7. the novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the inner layer comprises the following components in parts by weight:

8. the novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claim 1, wherein the preparation method of the glass fiber containing master batch comprises the following steps:

9. The preparation method of the novel glass fiber reinforced composite double-wall corrugated pipe as claimed in claims 1 to 8, which is characterized by comprising the following steps:

10. The use of the novel glass fiber reinforced composite double-walled corrugation of any one of claims 1 to 8 in a drainage pipe system, a communication pipe system, a fresh air pipe system or a drip irrigation system.