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Method for preparing plant fiber-based foamed thermoplastic masterbatch

A technology of plant fiber and foaming heat, which is applied in the field of preparation of natural plant fiber-based foaming thermoplastic masterbatch, can solve the problems of degradation of lignocellulosic materials, affect product quality, and decrease in mechanical strength, and achieve the improvement of mechanical properties and Improvement of plasticizing efficiency and hot-melt fluidity

Active Publication Date: 2017-01-04
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, the extrusion process barrel temperature range of wood-plastic composite materials is: 150-170°C for section I, 160-190°C for section II, 170-190°C for section III, 180-190°C for section IV, and the temperature of the head is 180-190°C. ℃ (Wood-plastic composite materials and products [M]. Chemical Industry Press, 2007), the temperature of the traditional wood-plastic composite material barrel is too high, which will easily cause the degradation of wood fiber materials, decrease the mechanical strength, and darken the color, which will affect the product quality

Method used

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  • Method for preparing plant fiber-based foamed thermoplastic masterbatch
  • Method for preparing plant fiber-based foamed thermoplastic masterbatch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1), mix 100g of dried plant fiber (rice straw crushed to 20 meshes in this example) and 200ml of lye swelling agent (sodium hydroxide solution with a concentration of 5%), and place at -10°C Immerse in the environment for 45 minutes, then move into an ultrasonic reactor with an ultrasonic frequency of 22kHz, the working pressure is 2Mpa (in the specific implementation, the working pressure can be selected in the range of 2-6MPa according to the actual situation), the stirring speed is 100rpm, and the ultrasonic reaction is 5min (the specific implementation During the process, the reaction time can also be selected according to the actual situation (5-40min); Drain the natural plant fiber powder and dry it at 103±2°C to obtain alkalized plant fiber powder (NaO-Wd);

[0036] Put 100g NaO-Wd and 100g modified plasticizer (obtained by mixing lauroyl chloride, benzyl chloride and maleic anhydride with a mass ratio of 5:4:1 in sequence) in a double-layer glass reactor, an...

Embodiment 2

[0045] Step 1) Mix 100g of dry and crushed wheat straw powder to 80 mesh with 250ml of 30% potassium hydroxide solution evenly, place it at -10°C for 45min, and then move it into an ultrasonic reactor with an ultrasonic frequency of 22kHz and a working pressure of 6MPa, stirring Rotate at 100rpm, sonicate for 40 minutes, drain the natural plant fiber powder, and dry it at 103±2°C to obtain alkalized plant fiber powder (NaO-Wd);

[0046] Put 100g NaO-Wd and 250g modified plasticizer (obtained by mixing lauroyl chloride, benzyl chloride and maleic anhydride with a mass ratio of 5:2:3 in turn) in a double-layer glass reactor. ℃ / min, heat up to 100°C, react for 90 minutes, cool down to 45°C naturally, filter with suction and wash the filter residue alternately with water and ethanol until the eluate is neutral, place the filter residue at 73°C for 24 hours in vacuum to obtain Plasticized natural plant fiber powder (ArO-Wd).

[0047] Step 2), 300g ArO-Wd, 100g polypropylene, 2.5g ...

Embodiment 3

[0054] Adjust step 2) in Example 2 to 400g ArO-Wd, 100g polypropylene, 2.5g foaming agent (azodicarbonamide 1-2: sodium bicarbonate: zinc oxide = 1:1:0.5), 3g calcium Zinc composite stabilizer, 5g titanium dioxide, 5g nano-calcium carbonate, and 5g coloring agent were placed in a high-speed mixer, heated at 100°C for 8 minutes, stirred evenly, cooled to 45°C, and discharged into the feed truck to obtain a Bubble thermoplastic compound. Other steps are the same as in Example 2), and the temperature setting of the extruder is shown in Table 1. The prepared natural plant fiber-based foamed thermoplastic masterbatch is marked as C.

[0055] Examples 2 and 3 prepared natural plant fiber-based foamed thermoplastic masterbatches, using a φ65 / 132 conical twin-screw extruder, heating temperature and other main parameters are shown in Table 1.

[0056] The performance testing data of natural plant fiber-based foamed thermoplastic masterbatch are shown in Table 2:

[0057] Table 2 Melt...

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Abstract

The invention discloses a method for preparing plant fiber-based foamed thermoplastic masterbatch. The method comprises the following specific steps: (A) crushing plant fibers, adding an alkali liquor swelling agent, soaking the processed plant fibers, and drying the soaked plant fibers after carrying out ultrasonic reaction; (B) adding a modified plasticizer, carrying out heating reaction for 30-90min, carrying out filtration after cooling, cleaning filter residues, and drying the cleaned filter residues; and (C) mixing plasticized plant fiber powder, a plastic matrix and auxiliaries, adding the mixture in an extruder, carrying out squeezing granulation to obtain the plant fiber-based foamed thermoplastic masterbatch. By the adoption of the invention, the glass transition temperature of natural plant fibers is optimized, the hot melting flowing property of the natural plant fibers is improved after being modified by the composite modified plasticizer, the wood-plastic plasticizing torsional force is effectively reduced, the energy consumption is greatly reduced, the cost is reduced, meanwhile, the mechanical property of the foamed thermoplastic masterbatch product can be improved by more than 25%, the impact resistance and the ductility are greatly improved, the material density is reduced, and thus the method has relatively high promotion and application values.

Description

technical field [0001] The invention belongs to the technical field of preparation of wood-plastic masterbatch, and in particular relates to a preparation method of natural plant fiber-based foamed thermoplastic masterbatch. Background technique [0002] Wood-plastic composite (WPC) is a modified thermoplastic material that is filled and reinforced with wood fiber or plant fiber, and made by hot-compression compounding, melt extrusion and other processing methods. In recent years, with the depletion of global resources, social awareness of environmental protection has been increasing, and higher requirements have been put forward for the application of wood and petrochemical products. WPC has good processing performance, strength, water resistance, corrosion resistance, long service life and wide processing methods. WPC can not only give full play to the advantages of each component in the material, overcome the use limitations caused by the low strength of wood, large va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L23/12C08L27/06C08L23/06C08K13/02C08K3/34C08K3/22C08K3/26C08J9/10C08J9/08
CPCC08J9/08C08J9/103C08J2203/02C08J2203/04C08J2203/204C08J2397/02C08J2423/06C08J2423/12C08J2427/06C08K2201/011C08L97/02C08L2203/14C08L2207/066C08L27/06C08K13/02C08K2003/2241C08K3/34C08K2003/2296C08L23/12C08K2003/265C08L23/06
Inventor 孙恩惠黄红英孙丰文常志州武国峰靳红梅
Owner JIANGSU ACAD OF AGRI SCI
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