Lignin (gnin) is a polydisperse amorphous natural high molecular polymer. It not only has all the thermoplastic, glassy transition properties of artificial polymer materials, but also has excellent properties of natural degradability. However, the lignin used in chemical and polymer materials so far only accounts for 1% of the total amount of 111, most of which are burned or directly discharged in the form of papermaking black liquor without being well-proportioned 03- 16 Received a revised manu Contact: Luo Xuegang. Author: Zhou Jian (1981-) male, graduate u Fund Project: the National High Technology Research and Development Program (2002AA322050) type of bamboo single-screw extruder screw a beat 201, E gserved with aspect ratio. In terms of foamed materials, due to its excellent properties, the application in the industries of machinery, chemicals, food, decoration, electronics, etc. is increasing at a faster rate. However, it is mainly made of artificial polymer materials, and there are generally problems such as high cost and difficulty in degradation.
As a natural polymer material, lignin is filled into artificial polymer materials, which not only can significantly improve various application properties such as mechanical strength, but also reduce the use of artificial polymer materials and reduce costs. In the blending system, with the degradation of lignin, the specific surface area of ​​the artificial polymer material is increased, and the degradation performance is improved. M. In the blending of lignin and artificial polymer materials, more and more Research and made great progress 4-7. Among them, Feldman181 investigated the partial or complete replacement of Ti2 in organic lignin into polyvinyl chloride (PVC) by differential scanning calorimetry (DSC) and scanning electron microscopy ( SEM) found that lignin has a good blending effect with PVC, and its mechanical strength has been improved. Luo Xuegang et al. studied the blending properties of lignin and ethylene-vinyl acetate copolymer (EVA), and obtained a lignin base film with excellent mechanical strength by extrusion blow molding. 131. Due to the blending of polyethylene (PE) and EVA The obtained material has good foaming properties such as adhesiveness and flexibility. The lignin can be added into the PE/EVA blend to obtain a foamed material by molding foaming. This work is rare at home and abroad. Report. The lignin, low density polyethylene (LDPE) and EVA were used as the main raw materials to study the blending properties of the three and the mechanical properties of the foamed material prepared by further using azodicarbonamide (AC) as a foaming agent. Its further development and application provide a certain theoretical basis.
1 Test part 11 Raw materials and instruments 5 ° C, the sol shows the pseudoplastic behavior of non-Newtonian fluid, the viscosity decreases with the increase of temperature, the average particle size is 31 186m, Shandong Wuyuan Xuemei Paper Co., Ltd.; LDPE, 951000 , Guangdong Maoming Petrochemical Ethylene Industry Co., Ltd.; EVA, VA content 14% (quality), Beijing Organic Chemical Plant; AC, Shandong Haiming Chemical Co., Ltd.; Dicumyl peroxide (DCP), Mianyang Chemical Company; low density poly Ethylene grafted maleic anhydride (LDPE-g-MAH), graft ratio 12%, melt flow rate 215g (190 ° C), Dalian Haizhou Chemical Co., Ltd.; dioctyl phthalate (DOP), Chengdu Kelon Chemical Reagent Factory.
Torque rheometer, XSS-300; mixer, LH60 are provided by Shanghai Kechuang Rubber & Plastic Machinery Co., Ltd.
12 test method 121 preparation of the test using lignin content (phantom), LDPE and EVA ratio (X2), compatibilizing dose (xO, plasticizer dose (4) and temperature (X5) 5 factors 5 horizontal orthogonal test (Table 1), the effects of various factors on the equilibrium torque (Nb) and plasticizing time in the blending process were studied. The formulation of Table 1 was unchanged with 100 parts of LDPE-EVA, and other components were used as benchmarks. The level of 2 to 2 is changed as shown in Table 1. The test conditions (temperature and speed, etc.) are input into the computer. After the temperature reaches the requirement, the temperature is kept for 30 minutes. The blended materials are added to the mixing chamber of the torque rheometer according to the test formula. After 15 minutes of mixing, the sample was scanned by scanning electron microscopy and analyzed by thermal analysis.
Table 1 Preparation of lignin/LDPE-EVA blend ratio 122 foaming material According to the rheological properties (balance torque and plasticizing time) of the blend and the blending performance characterization (SEM and thermal analysis) The formulation is combined with a blowing agent AC, a crosslinking agent DCP and other auxiliaries in a single screw extruder (re-extrudable) and granulated. The obtained lignin-based particles containing a foaming agent are placed in a mold previously coated with silicone oil as a release agent, and foamed, cooled, demolded, aged, and tested under certain conditions.
123 Performance Characterization The microscopic morphology of the blend was observed using an electron microscope (S440 stereo scanning electron microscope, LeicaCambridge Ltd). After the samples of the blend were frozen and fractured, gold was sprayed under vacuum for scanning electron microscopy analysis to observe the dispersion of lignin in PE/EVA. The thermal analysis of the obtained blend was characterized by STA449C comprehensive thermal analyzer (Nexus, Germany). The sample loading was 25 mg, the nitrogen atmosphere was at a heating rate of 10 ° C ° mind, and the scanning range was room temperature ~ 170 °. The mechanical properties of the foamed material produced were based on the results of GB 2 on the CMT 61.04 million capacity test machine (Shenzhen Xinsisi Material Testing Co., Ltd.) and discussed the rheological properties of the 211 blend of lignin/LDPE-EVA blending properties. The equilibrium torque of the mixed system refers to a relatively stable value obtained by the plastic material being gradually plasticized and the torque is reached after the raw material is added to the mixing chamber. The plasticizing time refers to the time required for the blend to start from the start of the feed until the blend is completely plasticized. The maximum torque and plasticization time data of the blend system were nonlinearly fitted by DPS software. After the significant level = 0.10, the insignificant term was removed, and the regression equation was obtained after simplification. As can be seen, the equilibrium torque of the blend system and x1 The quadratic squares of x2, x3, and x5 are positively correlated and negatively correlated with x5. At the same time, from. Lignin (lignin). Beng: (Li Xianfa), Luo (Li Xianfa) Luo (a practical analysis technique for polymer materials).
(Kingdom), Wang
(Finish)
Naipu ZJQ submersible Slurry pump is a kind of hydraulic mechanism which motor connects directly with pump.the pump adopts excellent material, advanced structure, and it is with wide flowing passage & strong delivery ability. The hydraulic parts are wear-resistant. The pump is yet completed with control unit. The pump set consists of main impeller and vice impeller. The main impeller is used for absorbing and delivering solid-liquid mixture, the vice impeller is used for spraying or stirring solid-liquid mixture to help the impeller delivering.
Typical Applications---
Delivering Liquid Sand, Coal Cinder Solid
Clearing The Mud In Lake, River, Sea
Dredging Widening Channel
ZJQ Submersible Slurry Pump Configuration Drawing
Performance Parameters
ZJQ Submersible Slurry Pump, High Chrome Submersible Pump, High Duty Mini Submersible Pump
Shijiazhuang Naipu Pump Co., Ltd. , https://www.naipu-pump.com