Bamboo fiber PE continuous composite production and processing method

Abstract

The invention relates to a bamboo fiber PE (polyethylene) continuous composite production and processing method, which comprises the following steps: by taking 80-100 meshes or more bamboo fibers as raw materials, modifying the surfaces of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers; and adding a coupling agent which is 5% of the total amount of the surface-modified bamboo fibers and a binder which is 2% of the total amount of the surface-modified bamboo fibers into the surface-modified bamboo fibers, and uniformly mixing to obtain the bamboo fiber additive. According to the invention, various specifications of corrugated pipes, winding pipes, solid-wall pipes and other pipeline products and bamboo fiber composite products can be continuously produced; according to the technology, in the normal product production process, the traditional production technology that granulation is conducted firstly and then production processing is conducted is omitted, and a large amount of manpower and production electricity cost are saved.

Description

Technical Field

[0001] The invention relates to the technical field of bamboo fiber PE, and in particular to a bamboo fiber PE continuous composite production and processing method. Background Art

[0002] Natural bamboo has excellent mechanical properties, and its tensile strength is higher than that of other natural materials except hemp, making it very suitable as a reinforcing phase for composite materials. In addition, bamboo itself has antibacterial, antibacterial, UV-resistant, good air permeability and other properties. Bamboo grows quickly, matures quickly, and has high yield. It is a renewable material with abundant resources, short growth cycle, and strong environmental protection function.

[0003] The existing preparation process of bamboo fiber PE material is simple, and the interface between bamboo fiber and PE material is poor, which easily leads to difficulty in coordinating and improving the mechanical strength and elastic modulus performance of the product, and the product has poor heat resistance and corrosion resistance, which limits the use efficiency of the product. Based on this, the present invention further improves it. Summary of the invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a bamboo fiber PE continuous composite production and processing method to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] The present invention provides a bamboo fiber PE continuous composite production and processing method, comprising the following steps:

[0007] Step 1: Using bamboo fibers with mesh sizes of 80-100 or above as raw materials, modifying the surface of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers;

[0008] Adding 5% of the total amount of the surface-modified bamboo fiber coupling agent and 2% of the total amount of the surface-modified bamboo fiber binder to the surface-modified bamboo fiber and mixing evenly to obtain a bamboo fiber additive;

[0009] Step 2: Use 15-85% PE raw material as composite material and mix it with 15-85% bamboo fiber through self-priming or screw feeding, and put it into the mixing barrel for standby;

[0010] Step 3: Install an automatic weighing and metering system under the material barrel, keep the material discharge port, discharge the material to the mixer feed port, use forced feeding, and install forward and reverse spiral mixers inside the barrel to prevent bamboo powder from bridging inside the barrel;

[0011] Step 4: Use 5-zone heating after mixing and extrusion;

[0012] Step 5: The bamboo fiber composite material after mixing and extrusion enters the feed port of the pipe extrusion equipment, enters the barrel, and is extruded into a bamboo fiber composite pipe through a screw.

[0013] Preferably, the specific treatment method of the surface modifier for modifying the surface of bamboo fiber is:

[0014] S1: Mix 2-5 parts of chitosan solution, 4-7 parts of ethanol solvent, and 3-4 parts of water to obtain chitosan solution;

[0015] S2: Mix hydroxyapatite and sodium silicate solution in a weight ratio of 2:5, and then add 4-7% kaolin agent to the total amount of hydroxyapatite, and stir thoroughly to obtain a blending agent;

[0016] The kaolin is heat treated at 145-150° C. for 10-15 minutes, and then air-cooled to room temperature, and the kaolin and lanthanum nitrate solution cooled to room temperature are stirred and mixed in a weight ratio of 2:5, and then washed with water, filtered, and dried to obtain a kaolin agent;

[0017] S3: mixing the conditioning agent and chitosan solution in a weight ratio of 2:5 to obtain a surface modifier;

[0018] S4: Spray the surface modifier until the surface of the bamboo fiber is completely soaked, and then dry it at 55-60℃ for 12h.

[0019] Chitosan solution is used to mix ethanol and water to form chitosan solution, and at the same time, hydroxyapatite and sodium silicate solution are mixed, and then kaolin is thermally modified to coordinate lanthanum nitrate solution to obtain kaolin agent. The bamboo fiber is optimized through the coordination between the raw materials, and the interface between the bamboo fiber and PE is enhanced through the surface improvement treatment of the bamboo fiber, and the product performance effect is coordinated and improved;

[0020] Preferably, the mass fraction of the sodium silicate solution is 2-5%; the mass fraction of the lanthanum nitrate solution is 3-5%.

[0021] Preferably, the mass fraction of the chitosan solution is 2-5%.

[0022] Preferably, the coupling agent is silane coupling agent KH560.

[0023] Preferably, the binder is polyacrylic acid.

[0024] Preferably, the 5 zones are heated: the temperature of zone 1 is 145°C, the temperature of zone 2 is 150°C, the temperature of zone 3 is 160°C, the temperature of zone 4 is 150°C, and the temperature of the die head of zone 5 is 130°C.

[0025] Preferably, 10-15% of modified nano calcium carbonate is added to the PE raw material, and the specific modification method is as follows:

[0026] S11: stirring and mixing the nano-calcium carbonate in a sufficient amount of yttrium nitrate solution, and then washing, filtering and drying to obtain yttrium-doped nano-calcium carbonate;

[0027] S12: 5-8 parts of yttrium-doped nano-calcium carbonate, 4-7 parts of sodium alginate solution, 3-5 parts of flaky talc and 3-6 parts of nano-silica sol are mixed and stirred, and after the stirring is completed, the mixture is washed with water, filtered and dried to obtain modified nano-calcium carbonate.

[0028] Nano calcium carbonate is treated with yttrium nitrate solution to optimize its activity performance. At the same time, it is improved by blending and coordinating with sodium alginate solution, flaky talcum powder and nano silica sol, thereby improving the coordination effect of modified nano calcium carbonate and surface modifier on bamboo fiber, and further improving product performance.

[0029] Preferably, the mass fraction of the sodium alginate solution is 2-5%; the mass fraction of the yttrium nitrate solution is 3-6%.

[0030] Preferably, the stirring speed of the blending and stirring process is 450-550 r / min, and the stirring is performed for 20-30 min.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The pipe forming process of the present invention adopts 5-zone temperature control, the normal temperature is 130-170℃, and the die head adopts 3-zone control. During normal production, this temperature can only be controlled to rise upwards and will not drop, so this process saves a lot of electricity costs. Under normal circumstances, this equipment does not need to be heated during the pipe production process; after entering the pipe extruder, the pipe extrusion equipment does not need to be heated for the second time, and the residual temperature of the bamboo fiber composite material is used to form the product; during the product production and forming process, considering the poor flow performance of bamboo fiber, it will cause the zone temperature of the barrel screw, and it is necessary to use a self-made barrel water bucket process for temperature control; during the product forming process of bamboo fiber composite products, internal and external The wrapping co-extrusion process ensures that bamboo fiber products are not combined with the outside air, making the service life of bamboo fiber longer; this technology can continuously produce various specifications of corrugated pipes, winding pipes, solid wall pipes and other pipe products and bamboo fiber composite products; this process reduces the traditional production process of first granulation and then production and processing in the normal product production process, saving a lot of manpower and production electricity costs; at the same time, surface modifiers are used to modify the surface of bamboo fibers and modified nano-calcium carbonate is used for adjustment and coordination treatment to jointly optimize the poor interface between bamboo fibers and PE materials, improve the product's mechanical strength, elastic modulus performance which is difficult to coordinate and improve, as well as the product's heat resistance and corrosion resistance stability. DETAILED DESCRIPTION

[0033] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] A bamboo fiber PE continuous composite production and processing method of this embodiment includes the following steps:

[0035] Step 1: Using bamboo fibers with mesh sizes of 80-100 or above as raw materials, modifying the surface of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers;

[0036] Adding 5% of the total amount of the surface-modified bamboo fiber coupling agent and 2% of the total amount of the surface-modified bamboo fiber binder to the surface-modified bamboo fiber and mixing evenly to obtain a bamboo fiber additive;

[0037] Step 2: Use 15-85% PE raw material as composite material and mix it with 15-85% bamboo fiber through self-priming or screw feeding, and put it into the mixing barrel for standby;

[0038] Step 3: Install an automatic weighing and metering system under the material barrel, keep the material discharge port, discharge the material to the mixer feed port, use forced feeding, and install forward and reverse spiral mixers inside the barrel to prevent bamboo powder from bridging inside the barrel;

[0039] Step 4: Use 5-zone heating after mixing and extrusion;

[0040] Step 5: The bamboo fiber composite material after mixing and extrusion enters the feed port of the pipe extrusion equipment, enters the barrel, and is extruded into a bamboo fiber composite pipe through a screw.

[0041] The specific treatment method of the surface modifier of the present embodiment for modifying the surface of bamboo fiber is as follows:

[0042] S1: Mix 2-5 parts of chitosan solution, 4-7 parts of ethanol solvent, and 3-4 parts of water to obtain chitosan solution;

[0043] S2: Mix hydroxyapatite and sodium silicate solution in a weight ratio of 2:5, and then add 4-7% kaolin agent to the total amount of hydroxyapatite, and stir thoroughly to obtain a blending agent;

[0044] The kaolin is heat treated at 145-150° C. for 10-15 minutes, and then air-cooled to room temperature, and the kaolin and lanthanum nitrate solution cooled to room temperature are stirred and mixed in a weight ratio of 2:5, and then washed with water, filtered, and dried to obtain a kaolin agent;

[0045] S3: mixing the conditioning agent and chitosan solution in a weight ratio of 2:5 to obtain a surface modifier;

[0046] S4: Spray the surface modifier until the surface of the bamboo fiber is completely soaked, and then dry it at 55-60℃ for 12h.

[0047] The mass fraction of the sodium silicate solution in this embodiment is 2-5%; the mass fraction of the lanthanum nitrate solution is 3-5%.

[0048] The mass fraction of the chitosan solution in this embodiment is 2-5%.

[0049] The coupling agent in this embodiment is silane coupling agent KH560.

[0050] The binder in this embodiment is polyacrylic acid.

[0051] The 5-zone heating in this embodiment: the temperature of zone 1 is 145°C, the temperature of zone 2 is 150°C, the temperature of zone 3 is 160°C, the temperature of zone 4 is 150°C, and the temperature of the die head of zone 5 is 130°C.

[0052] In this embodiment, 10-15% of the total amount of PE raw materials is added to the PE raw materials. The specific modification method is as follows:

[0053] S11: stirring and mixing the nano-calcium carbonate in a sufficient amount of yttrium nitrate solution, and then washing, filtering and drying to obtain yttrium-doped nano-calcium carbonate;

[0054] S12: 5-8 parts of yttrium-doped nano-calcium carbonate, 4-7 parts of sodium alginate solution, 3-5 parts of flaky talc and 3-6 parts of nano-silica sol are mixed and stirred, and after the stirring is completed, the mixture is washed with water, filtered and dried to obtain modified nano-calcium carbonate.

[0055] The mass fraction of the sodium alginate solution in this embodiment is 2-5%; the mass fraction of the yttrium nitrate solution is 3-6%.

[0056] The stirring speed of the blending and stirring process in this embodiment is 450-550r / min, and the stirring is 20-30min.

[0057] Example 1.

[0058] A bamboo fiber PE continuous composite production and processing method of this embodiment includes the following steps:

[0059] Step 1: Using bamboo fibers with mesh size of 80 or above as raw materials, modifying the surface of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers;

[0060] Adding 5% of the total amount of the surface-modified bamboo fiber coupling agent and 2% of the total amount of the surface-modified bamboo fiber binder to the surface-modified bamboo fiber and mixing evenly to obtain a bamboo fiber additive;

[0061] Step 2: Use 85% PE raw material as composite material and mix it with 15% bamboo fiber through self-priming or screw feeding, and put it into the mixing barrel for standby;

[0062] Step 3: Install an automatic weighing and metering system under the material barrel, keep the material discharge port, discharge the material to the mixer feed port, use forced feeding, and install forward and reverse spiral mixers inside the barrel to prevent bamboo powder from bridging inside the barrel;

[0063] Step 4: Use 5-zone heating after mixing and extrusion;

[0064] Step 5: The bamboo fiber composite material after mixing and extrusion enters the feed port of the pipe extrusion equipment, enters the barrel, and is extruded into a bamboo fiber composite pipe through a screw.

[0065] The specific treatment method of the surface modifier of the present embodiment for modifying the surface of bamboo fiber is as follows:

[0066] S1: Mix 2 parts of chitosan solution, 4 parts of ethanol solvent and 3 parts of water to obtain chitosan solution;

[0067] S2: Mix hydroxyapatite and sodium silicate solution in a weight ratio of 2:5, and then add kaolin agent of 4% of the total amount of hydroxyapatite, and stir thoroughly to obtain a blending agent;

[0068] The kaolin was heat treated at 145° C. for 10 min, and then air-cooled to room temperature. The kaolin and lanthanum nitrate solution cooled to room temperature were stirred and mixed in a weight ratio of 2:5, and then washed with water, filtered, and dried to obtain a kaolin agent.

[0069] S3: mixing the conditioning agent and chitosan solution in a weight ratio of 2:5 to obtain a surface modifier;

[0070] S4: Spray the surface modifier until the surface of the bamboo fiber is completely soaked, and then dry it at 55°C for 12 hours.

[0071] The mass fraction of the sodium silicate solution in this embodiment is 2%; the mass fraction of the lanthanum nitrate solution is 3%.

[0072] The mass fraction of the chitosan solution in this embodiment is 2%.

[0073] The coupling agent in this embodiment is silane coupling agent KH560.

[0074] The binder in this embodiment is polyacrylic acid.

[0075] The 5-zone heating in this embodiment: the temperature of zone 1 is 145°C, the temperature of zone 2 is 150°C, the temperature of zone 3 is 160°C, the temperature of zone 4 is 150°C, and the temperature of the die head of zone 5 is 130°C.

[0076] In this embodiment, 10% of the total amount of modified nano calcium carbonate is added to the PE raw material. The specific modification method is as follows:

[0077] S11: stirring and mixing the nano-calcium carbonate in a sufficient amount of yttrium nitrate solution, and then washing, filtering and drying to obtain yttrium-doped nano-calcium carbonate;

[0078] S12: 5 parts of yttrium-doped nano-calcium carbonate, 4 parts of sodium alginate solution, 3 parts of flaky talc and 3 parts of nano-silica sol are mixed and stirred, and after the stirring is completed, the mixture is washed with water, filtered and dried to obtain modified nano-calcium carbonate.

[0079] The mass fraction of the sodium alginate solution in this embodiment is 2%; the mass fraction of the yttrium nitrate solution is 3%.

[0080] The stirring speed of the blending and stirring process in this embodiment is 450r / min, and the stirring is performed for 20min.

[0081] Example 2.

[0082] A bamboo fiber PE continuous composite production and processing method of this embodiment includes the following steps:

[0083] Step 1: Using bamboo fibers with mesh size of 100 or above as raw materials, modifying the surface of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers;

[0084] Adding 5% of the total amount of the surface-modified bamboo fiber coupling agent and 2% of the total amount of the surface-modified bamboo fiber binder to the surface-modified bamboo fiber and mixing evenly to obtain a bamboo fiber additive;

[0085] Step 2: Use 85% PE raw material as composite material and mix it with 15% bamboo fiber through self-priming or screw feeding, and put it into the mixing barrel for standby;

[0086] Step 3: Install an automatic weighing and metering system under the material barrel, keep the material discharge port, discharge the material to the mixer feed port, use forced feeding, and install forward and reverse spiral mixers inside the barrel to prevent bamboo powder from bridging inside the barrel;

[0087] Step 4: Use 5-zone heating after mixing and extrusion;

[0088] Step 5: The bamboo fiber composite material after mixing and extrusion enters the feed port of the pipe extrusion equipment, enters the barrel, and is extruded into a bamboo fiber composite pipe through a screw.

[0089] The specific treatment method of the surface modifier of the present embodiment for modifying the surface of bamboo fiber is as follows:

[0090] S1: Mix 5 parts of chitosan solution, 7 parts of ethanol solvent and 4 parts of water to obtain chitosan solution;

[0091] S2: Mix hydroxyapatite and sodium silicate solution in a weight ratio of 2:5, and then add kaolin agent of 7% of the total amount of hydroxyapatite, and stir thoroughly to obtain a blending agent;

[0092] The kaolin was heat treated at 150° C. for 15 min, and then air-cooled to room temperature. The kaolin and lanthanum nitrate solution cooled to room temperature were stirred and mixed in a weight ratio of 2:5, and then washed with water, filtered, and dried to obtain a kaolin agent.

[0093] S3: mixing the conditioning agent and chitosan solution in a weight ratio of 2:5 to obtain a surface modifier;

[0094] S4: Spray the surface modifier until the surface of the bamboo fiber is completely soaked, and then dry it at 60°C for 12 hours.

[0095] The mass fraction of the sodium silicate solution in this embodiment is 5%; the mass fraction of the lanthanum nitrate solution is 3-5%.

[0096] The mass fraction of the chitosan solution in this embodiment is 5%.

[0097] The coupling agent in this embodiment is silane coupling agent KH560.

[0098] The binder in this embodiment is polyacrylic acid.

[0099] The 5-zone heating in this embodiment: the temperature of zone 1 is 145°C, the temperature of zone 2 is 150°C, the temperature of zone 3 is 160°C, the temperature of zone 4 is 150°C, and the temperature of the die head of zone 5 is 130°C.

[0100] In this embodiment, 15% of the total amount of modified nano calcium carbonate is added to the PE raw material, and the specific modification method is as follows:

[0101] S11: stirring and mixing the nano-calcium carbonate in a sufficient amount of yttrium nitrate solution, and then washing, filtering and drying to obtain yttrium-doped nano-calcium carbonate;

[0102] S12: 8 parts of yttrium-doped nano-calcium carbonate, 7 parts of sodium alginate solution, 5 parts of flaky talc and 6 parts of nano-silica sol are mixed and stirred, and after the stirring is completed, the mixture is washed with water, filtered and dried to obtain modified nano-calcium carbonate.

[0103] The mass fraction of the sodium alginate solution in this embodiment is 5%; the mass fraction of the yttrium nitrate solution is 6%.

[0104] The stirring speed of the blending and stirring process in this embodiment is 550r / min, and the stirring is 30min.

[0105] Example 3.

[0106] A bamboo fiber PE continuous composite production and processing method of this embodiment includes the following steps:

[0107] Step 1: Using bamboo fibers with mesh size of 90 or above as raw materials, modifying the surface of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers;

[0108] Adding 5% of the total amount of the surface-modified bamboo fiber coupling agent and 2% of the total amount of the surface-modified bamboo fiber binder to the surface-modified bamboo fiber and mixing evenly to obtain a bamboo fiber additive;

[0109] Step 2: Use 85% PE raw material as composite material and mix it with 15% bamboo fiber through self-priming or screw feeding, and put it into the mixing barrel for standby;

[0110] Step 3: Install an automatic weighing and metering system under the material barrel, keep the material discharge port, discharge the material to the mixer feed port, use forced feeding, and install forward and reverse spiral mixers inside the barrel to prevent bamboo powder from bridging inside the barrel;

[0111] Step 4: Use 5-zone heating after mixing and extrusion;

[0112] Step 5: The bamboo fiber composite material after mixing and extrusion enters the feed port of the pipe extrusion equipment, enters the barrel, and is extruded into a bamboo fiber composite pipe through a screw.

[0113] The specific treatment method of the surface modifier of the present embodiment for modifying the surface of bamboo fiber is as follows:

[0114] S1: 3.5 parts of chitosan solution, 5.5 parts of ethanol solvent and 3.5 parts of water are mixed to obtain chitosan solution;

[0115] S2: Mix hydroxyapatite and sodium silicate solution in a weight ratio of 2:5, and then add 5.5% of kaolin agent to the total amount of hydroxyapatite, and stir thoroughly to obtain a blending agent;

[0116] The kaolin was heat treated at 147° C. for 12.5 min, and then air-cooled to room temperature. The kaolin and lanthanum nitrate solution cooled to room temperature were stirred and mixed in a weight ratio of 2:5, and then washed with water, filtered, and dried to obtain a kaolin agent.

[0117] S3: mixing the conditioning agent and chitosan solution in a weight ratio of 2:5 to obtain a surface modifier;

[0118] S4: Spray the surface modifier until the surface of the bamboo fiber is completely soaked, and then dry it at 58°C for 12 hours.

[0119] The mass fraction of the sodium silicate solution in this embodiment is 3.5%; the mass fraction of the lanthanum nitrate solution is 4%.

[0120] The mass fraction of the chitosan solution in this embodiment is 3.5%.

[0121] The coupling agent in this embodiment is silane coupling agent KH560.

[0122] The binder in this embodiment is polyacrylic acid.

[0123] The 5-zone heating in this embodiment: the temperature of zone 1 is 145°C, the temperature of zone 2 is 150°C, the temperature of zone 3 is 160°C, the temperature of zone 4 is 150°C, and the temperature of the die head of zone 5 is 130°C.

[0124] In this embodiment, 12.5% ​​of the total amount of PE raw materials is added to the PE raw materials. The specific modification method is as follows:

[0125] S11: stirring and mixing the nano-calcium carbonate in a sufficient amount of yttrium nitrate solution, and then washing, filtering and drying to obtain yttrium-doped nano-calcium carbonate;

[0126] S12: 6.5 parts of yttrium-doped nano-calcium carbonate, 5.5 parts of sodium alginate solution, 4 parts of flaky talc and 4.5 parts of nano-silica sol are mixed and stirred, and after the stirring is completed, the mixture is washed with water, filtered and dried to obtain modified nano-calcium carbonate.

[0127] The mass fraction of the sodium alginate solution in this embodiment is 3.5%; the mass fraction of the yttrium nitrate solution is 4.5%.

[0128] The stirring speed of the blending and stirring process in this embodiment is 500 r / min, and the stirring is performed for 25 minutes.

[0129] Comparative Example 1.

[0130] The difference from Example 3 is that no surface modifier is used to modify the surface of the bamboo fiber.

[0131] Comparative Example 2.

[0132] The difference from Example 3 is that no conditioning agent is added to the surface modifier.

[0133] Comparative Example 3.

[0134] The difference from Example 3 is that no kaolin agent is added to the blending agent.

[0135] Comparative Example 4.

[0136] The difference from Example 3 is that the kaolin agent is replaced by kaolin.

[0137] Comparative Example 5.

[0138] The difference from Example 3 is that no modified nano calcium carbonate is added.

[0139] Comparative Example 6.

[0140] The difference from Example 3 is that step S11 is not used in the preparation of modified nano-calcium carbonate.

[0141] Comparative Example 7.

[0142] The difference from Example 3 is that step S12 is not used in the preparation of modified nano-calcium carbonate.

[0143] Conventional tests, product performance tests of Examples 1 to 3 and Comparative Examples 1 to 7, and placing the products at 65°C for 12 hours, and then placing them under 2% hydrochloric acid mist conditions for 12 hours, testing the heat resistance and acid corrosion resistance stability of the products, the test results are as follows;

[0144]

[0145]

[0146] It can be seen from Comparative Examples 1 to 7 and Examples 1 to 3 that;

[0147] The product of Example 3 has excellent tensile strength and elastic modulus, and is also excellent in heat resistance and acid corrosion resistance. The performance effects of Comparative Examples 1-7 are not as good as those of Example 3.

[0148] From Comparative Examples 1 to 7 and Example 3, it can be seen that the product does not use a surface modifier to modify the surface of the bamboo fiber, and does not add modified nano calcium carbonate, the product performance deteriorates significantly. The coordinated use of the two has the most obvious product performance effect.

[0149] The performance of the products tended to deteriorate when no conditioning agent was added to the surface modifier, no kaolin agent was added to the conditioning agent, kaolin agent was replaced by kaolin, S11 step was not used in the preparation of modified nano calcium carbonate, and S12 step was not used in the preparation of modified nano calcium carbonate.

[0150] Only when the kaolin agent prepared by the method of the present invention is combined with the blending agent of the present invention for surface modification treatment and specific modified nano calcium carbonate, the performance effect of the product is the most significant, and the effect of the present invention is not as obvious as that of other methods.

[0151] The surface of bamboo fiber is modified by surface modifier and coordinated with modified nano-calcium carbonate to jointly optimize the poor interface between bamboo fiber and PE material, improve the mechanical strength and elastic modulus performance of the product which is difficult to coordinate, as well as the heat resistance and corrosion resistance stability of the product.

[0152] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0153] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A bamboo fiber PE continuous composite production and processing method, characterized in that: The following steps are involved: Step 1: Using bamboo fibers with mesh sizes of 80-100 or above as raw materials, modifying the surface of the bamboo fibers by using a surface modifier to obtain surface-modified bamboo fibers; Adding 5% of the total amount of the surface-modified bamboo fiber coupling agent and 2% of the total amount of the surface-modified bamboo fiber binder to the surface-modified bamboo fiber and mixing evenly to obtain a bamboo fiber additive; Step 2: Use 15-85% PE raw material as composite material and mix it with 15-85% bamboo fiber through self-priming or screw feeding, and put it into the mixing barrel for standby; Step 3: Install an automatic weighing and metering system under the material barrel, keep the material discharge port, discharge the material to the mixer feed port, use forced feeding, and install forward and reverse spiral mixers inside the barrel to prevent bamboo powder from bridging inside the barrel; Step 4: Use 5-zone heating after mixing and extrusion; Step 5: The bamboo fiber composite material after mixing and extrusion enters the feed port of the pipe extrusion equipment, enters the barrel, and is extruded into a bamboo fiber composite pipe through a screw.

2. The bamboo fiber PE continuous composite production and processing method according to claim 1 is characterized in that: The specific treatment method of the surface modifier for modifying the surface of bamboo fiber is as follows: S1: Mix 2-5 parts of chitosan solution, 4-7 parts of ethanol solvent, and 3-4 parts of water to obtain chitosan solution; S2: Mix hydroxyapatite and sodium silicate solution in a weight ratio of 2:5, and then add 4-7% of kaolin agent to the total amount of hydroxyapatite, and stir thoroughly to obtain a blending agent; The kaolin is heat treated at 145-150° C. for 10-15 minutes, and then air-cooled to room temperature, and the kaolin and lanthanum nitrate solution cooled to room temperature are stirred and mixed in a weight ratio of 2:5, and then washed with water, filtered, and dried to obtain a kaolin agent; S3: mixing the conditioning agent and chitosan solution in a weight ratio of 2:5 to obtain a surface modifier; S4: Spray the surface modifier until the surface of the bamboo fiber is completely soaked, and then dry it at 55-60℃ for 12h. When the drying is completed, it is done.

3. The method for continuous composite production and processing of bamboo fiber PE according to claim 2, characterized in that: The mass fraction of the sodium silicate solution is 2-5%; the mass fraction of the lanthanum nitrate solution is 3-5%.

4. The method for continuous composite production and processing of bamboo fiber and PE according to claim 2, characterized in that: The mass fraction of the chitosan solution is 2-5%.

5. The method for continuous composite production and processing of bamboo fiber and PE according to claim 1, characterized in that: The coupling agent is silane coupling agent KH560.

6. The method for continuous composite production and processing of bamboo fiber and PE according to claim 1, characterized in that: The binder is polyacrylic acid.

7. The bamboo fiber PE continuous composite production and processing method according to claim 1 is characterized in that: The 5 zones are heated as follows: the temperature of zone 1 is 145°C, the temperature of zone 2 is 150°C, the temperature of zone 3 is 160°C, the temperature of zone 4 is 150°C, and the temperature of the die head of zone 5 is 130°C.

8. The bamboo fiber PE continuous composite production and processing method according to claim 1 is characterized in that: 10-15% of the total amount of PE raw materials is also added to the PE raw materials. The specific modification method is as follows: S11: stirring and mixing the nano-calcium carbonate in a sufficient amount of yttrium nitrate solution, and then washing, filtering and drying to obtain yttrium-doped nano-calcium carbonate; S12: 5-8 parts of yttrium-doped nano-calcium carbonate, 4-7 parts of sodium alginate solution, 3-5 parts of flaky talc and 3-6 parts of nano-silica sol are mixed and stirred, and after the stirring is completed, the mixture is washed with water, filtered and dried to obtain modified nano-calcium carbonate.

9. The bamboo fiber PE continuous composite production and processing method according to claim 8, characterized in that: The mass fraction of the sodium alginate solution is 2-5%; the mass fraction of the yttrium nitrate solution is 3-6%.

10. The method for continuous composite production and processing of bamboo fiber and PE according to claim 8, characterized in that: The stirring speed of the blending and stirring treatment is 450-550r / min, and the stirring is performed for 20-30min.

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