CN116871525A - Method for producing metal injection molding feed adhesive by using ionic TLCP - Google Patents
Method for producing metal injection molding feed adhesive by using ionic TLCP Download PDFInfo
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- CN116871525A CN116871525A CN202310837454.3A CN202310837454A CN116871525A CN 116871525 A CN116871525 A CN 116871525A CN 202310837454 A CN202310837454 A CN 202310837454A CN 116871525 A CN116871525 A CN 116871525A
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- tlcp
- injection molding
- feed
- adhesive
- metal injection
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- 239000000853 adhesive Substances 0.000 title claims abstract description 38
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 title claims abstract description 25
- 238000001746 injection moulding Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 17
- 229920000106 Liquid crystal polymer Polymers 0.000 claims abstract description 13
- 125000003010 ionic group Chemical group 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims abstract description 10
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 13
- -1 polyfluorocarbon Polymers 0.000 claims description 13
- 239000012188 paraffin wax Substances 0.000 claims description 7
- XKZQKPRCPNGNFR-UHFFFAOYSA-N 2-(3-hydroxyphenyl)phenol Chemical compound OC1=CC=CC(C=2C(=CC=CC=2)O)=C1 XKZQKPRCPNGNFR-UHFFFAOYSA-N 0.000 claims description 5
- 150000001263 acyl chlorides Chemical class 0.000 claims description 5
- 150000004985 diamines Chemical class 0.000 claims description 5
- 150000002009 diols Chemical class 0.000 claims description 5
- 239000004974 Thermotropic liquid crystal Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 238000006068 polycondensation reaction Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims 4
- 239000000956 alloy Substances 0.000 claims 4
- 239000002245 particle Substances 0.000 claims 2
- 239000011347 resin Substances 0.000 claims 2
- 229920005989 resin Polymers 0.000 claims 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims 1
- 229910000881 Cu alloy Inorganic materials 0.000 claims 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims 1
- 229910001182 Mo alloy Inorganic materials 0.000 claims 1
- 239000004677 Nylon Substances 0.000 claims 1
- 229920001744 Polyaldehyde Polymers 0.000 claims 1
- 239000004697 Polyetherimide Substances 0.000 claims 1
- 239000004698 Polyethylene Substances 0.000 claims 1
- 239000004642 Polyimide Substances 0.000 claims 1
- 239000004721 Polyphenylene oxide Substances 0.000 claims 1
- 239000004734 Polyphenylene sulfide Substances 0.000 claims 1
- 239000004793 Polystyrene Substances 0.000 claims 1
- 229910001069 Ti alloy Inorganic materials 0.000 claims 1
- 229910001080 W alloy Inorganic materials 0.000 claims 1
- 229920006020 amorphous polyamide Polymers 0.000 claims 1
- 229920006039 crystalline polyamide Polymers 0.000 claims 1
- 125000004093 cyano group Chemical group *C#N 0.000 claims 1
- 229910000833 kovar Inorganic materials 0.000 claims 1
- 150000002825 nitriles Chemical class 0.000 claims 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims 1
- 229920001778 nylon Polymers 0.000 claims 1
- 229920001643 poly(ether ketone) Polymers 0.000 claims 1
- 239000004417 polycarbonate Substances 0.000 claims 1
- 229920000515 polycarbonate Polymers 0.000 claims 1
- 229920000728 polyester Polymers 0.000 claims 1
- 229920001601 polyetherimide Polymers 0.000 claims 1
- 229920000573 polyethylene Polymers 0.000 claims 1
- 229920001721 polyimide Polymers 0.000 claims 1
- 229920001470 polyketone Polymers 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 229920000098 polyolefin Polymers 0.000 claims 1
- 229920006380 polyphenylene oxide Polymers 0.000 claims 1
- 229920000069 polyphenylene sulfide Polymers 0.000 claims 1
- 229920002223 polystyrene Polymers 0.000 claims 1
- 229920002635 polyurethane Polymers 0.000 claims 1
- 239000004814 polyurethane Substances 0.000 claims 1
- 229920001291 polyvinyl halide Polymers 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 125000000542 sulfonic acid group Chemical group 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 125000004953 trihalomethyl group Chemical group 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 2
- 229920001169 thermoplastic Polymers 0.000 abstract description 2
- 239000004416 thermosoftening plastic Substances 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 1
- 238000012797 qualification Methods 0.000 abstract 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 14
- 229920006324 polyoxymethylene Polymers 0.000 description 14
- 239000004743 Polypropylene Substances 0.000 description 10
- 229920001903 high density polyethylene Polymers 0.000 description 10
- 239000004700 high-density polyethylene Substances 0.000 description 10
- 229920001684 low density polyethylene Polymers 0.000 description 10
- 239000004702 low-density polyethylene Substances 0.000 description 10
- 239000008188 pellet Substances 0.000 description 9
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 7
- 239000001993 wax Substances 0.000 description 7
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical group 0.000 description 1
- 229910002065 alloy metal Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004993 liquid crystal window Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
Abstract
The invention discloses a method for producing a metal injection molding feed adhesive by using an ionic TLCP. To meet the demands of metal injection molding, a feed with high fluidity, high mechanical strength and low linear expansion coefficient is produced. The method selects the liquid crystal polymer with ion groups and the thermoplastic binder to prepare the feed according to a certain proportion. The TLCP generates liquid crystal phase change in the range of injection processing temperature, so that the feed has low linear expansion coefficient and good processing performance. Under the action of the jet force field, rigid molecules in the liquid crystal form a highly oriented condensed state structure, so that the fluidity and the processing performance of the feed are improved. The ionic group can improve interfacial compatibility, and the similar low linear expansion coefficient with metal can ensure the mechanical stability of the metal and the adhesive system in the sintering process and prevent cracking. Thereby effectively improving the qualification rate of the metal injection molding product. The invention can be applied to the production of superfine powder feeding, thin-wall metal parts and metal injection molding of precise parts.
Description
Technical Field
The invention relates to the technical field of powder metallurgy, in particular to a method for preparing a high-performance metal injection molding feed adhesive with controllable use temperature by utilizing the arrangement characteristic of phase change molecules of an ionic TLCP (thermotropic liquid crystal polymer).
Background
The metal injection molding is a molding method for injecting a mixture of metal powder and a binder thereof into a mold, and has the advantages of high material utilization rate, capability of integrally molding parts with complex structures, high molding efficiency and the like. The adhesive performance of the feeding is an important factor affecting the metal injection molding product, and generally thermoplastic resin, gel-based and wax-based substances are mainly adopted, wherein the thermoplastic resin has high strength and strong powder grabbing capability as a main filler, so that the uniformity and the processability are good, the high-temperature and rapid solidification can be realized, the injection molding efficiency is improved, and the main-stream adhesive gradually becomes a main-stream adhesive component. TLCP (thermotropic liquid crystal polymer) is a class of high performance liquid crystal polymer materials with a broad liquid crystal window. In the injection process, under the action of stress, TLCP liquid crystal molecular chains are aligned along the flow field direction, and are arranged to form a highly aligned condensed structure. This structure gives the feed excellent overall properties in the direction of injection: low linear expansion coefficient, good processability, high strength, high modulus, high toughness and other mechanical properties. In the processing process of blending and compounding with other adhesives, under the action of external force, molecular chains are aligned along the flowing direction, so that the processing viscosity is reduced, the shrinkage rate of the product in the forming process is small, flash is not easy to generate, the rejection rate is low, the precision of the finished product is high, and meanwhile, the loss of equipment in the polymer processing engineering is reduced. Meanwhile, the ionic groups introduced in the TLCP molecular chain play a role in interfacial compatibilization, and stabilize a feeding system.
The invention aims at the optimal design of the feed formula and the production process of the injection molding high-fluidity superfine metal powder, adopts TLCP mixed addition, improves the comprehensive processing performance of the feed, and ensures the high yield of injection molding.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a forming method for injecting a mixture of metal powder and a binder thereof into a mold, which has the advantages of high material utilization rate, capability of integrally forming parts with complex structures, high forming efficiency and the like.
The key steps of the technical scheme adopted by the invention are as follows:
1. synthesis of TLCP
The liquid crystal polymer with ionic group is formed by polycondensation of one or several of diol, diphenol or diamine and intermediate with ionic group, and the TLCP is organic polymer formed by R1, R2 and R3 in the molar ratio of (30-48): 2-20): 50 and R.
Wherein R1 isExpressed building blocks and/or +.>The structural unit represented by R2 is +.>Represented structural units or->Represented structural unit, R3 isAnd R is aromatic hydrocarbon or alkane.
The diphenol is one or more of the following structural formulas:
wherein a=1 to 2.
The diol has the following structural formula:
wherein b=2 to 12.
The diamine is one or more of the following structural formulas:
wherein c=1 to 3 and d=2 to 12.
The acyl chloride isAnd/or +.>Wherein n=1 to 3, m=2 to 12.
The preparation method of the liquid crystal polymer with the ionic group comprises the following steps:
(1) Weighing 1-20% of monomer with ionic groups, 50% of acyl chloride and the balance of one or more of diol, diphenol or diamine according to a molar ratio for later use;
(2) Dissolving one or more of diol, diphenol or diamine, and monomer with ionic group in solvent, wherein the solvent is one of DMF, THF, acetonitrile, ethyl acetate or DMSO, to obtain mixed solution A;
(3) Adding an acid binding agent into the mixed solution A to obtain a mixed solution B;
(4) Dissolving acyl chloride in the same solvent used in the step (2), slowly dripping the acyl chloride into the mixed solution B, uniformly stirring, slowly heating to 60-120 ℃, and reacting for 12-36 h to obtain a mixed solution C;
(5) Adding alcohol substances into the mixed solution C to separate out solids, and washing, filtering and drying for multiple times to obtain the liquid crystal polymer with ionic groups.
Wherein DMF is N, N dimethylformamide; THF is tetrahydrofuran; DMSO is dimethyl sulfoxide; the acid binding agent can be or, and the alcohol substance can be ethanol; the preferred molar ratio of monomers with ionic groups in step (1) is from 5 to 16%. Since the reaction for synthesizing the liquid crystal polymer of the present invention is a polycondensation reaction, the sum of the molar numbers of the alcoholic hydroxyl group, the phenolic hydroxyl group and the amino group in the reaction should be the same as the molar number of the acid chloride in the above-mentioned production method to achieve a higher weight average molecular weight.
2. Banburying and mixing
The addition amount of TLCP is not high and thus is not suitable in the case of using a large-scale blending apparatus (uniform dispersion of TLCP in thermoplastic adhesive can be obtained by one or more blending operations). At least one binder is first mixed with a sufficient amount of TLCP in an internal mixer to form a mixture a containing more than 2% TLCP. More binder was then added to the masterbatch by twin screw extrusion, the amount of addition being calculated to control the TLCP content in the final product. The formation of the feed pellets is a process of diluting the concentration of TLCP in the binder system to the desired concentration, while in the molten state at extrusion, where TLCP is in the liquid state. The feed formation step and subsequent dilution may be repeated if desired. The dilution process can be performed in steps in which the concentration of TLCP in the blend can be continuously reduced by adding a binder to the blend. While the actual conditions for the blending of the adhesive and TLCP will vary with the nature of the actual component, the basic sequence of processing is independent of the component. First, TLCP is blended at a temperature at which the binder is in a molten state and TLCP is in a solid state to produce a mixture. The proportion of TLCP in the initial mixture is variable, i.e. the relative amounts of adhesive and LCP are variable. The adhesive and LCP are then further processed with the former melting and the latter being in the liquid crystalline state, and a feed of TLCP uniformly dispersed in the adhesive system is produced.
When the adhesive and TLCP are blended in the molten state of the adhesive and the LCP is in the liquid crystal state, the processing parameters vary with the properties of the mixing ingredients, the relative amounts of each, the type and size of the mixing equipment, and the effective shear rate. However, at the optimum blending temperature, less torque is required to mix or extrude the feed than is required to mix or extrude the adhesive alone.
3. Granulating injection
And injecting the plastic-increasing mixture of the alloy metal powder and the binder thereof into a mould for forming by adopting metal injection forming MIM (Metal injection Molding), and sintering to obtain a final product.
The product production is completed in eight steps as shown in fig. 4. The selected powder is first matched to the binder. The powder and the binder are mixed and banburying to become a feed. The mixture is then granulated and injection molded into the desired shape. After the binder is removed after forming, the degreased blank is sintered. And finally, carrying out densification treatment, heat treatment or machining on the sintered product to obtain the final product.
The sintered product has the same complex shape and high precision as the product obtained by the plastic injection molding method, and has physical, chemical and mechanical properties close to those of the forging.
Drawings
FIG. 1 shows a TLCP liquid crystal polarization microscope image of a wide liquid crystal temperature range;
three-dimensional infrared analysis of the binder without the ion-containing TLCP of fig. 2 shows that the different binders are unevenly dispersed with agglomeration;
FIG. 3 is a three-dimensional infrared analysis of a mixed binder containing ions TLCP, the presence of ions and TLCP acting to provide interfacial compatibilization to provide a more uniform and stable feed system;
FIG. 4 product production flow diagram;
fig. 5 changes in the physical and mechanical properties of TLCP composites with different levels of ionic groups.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
Example 1 preparation of feed POM (polyoxymethylene), WAX (paraffin WAX), HDPE (high density polyethylene), LDPE (low density polyethylene), PP (polypropylene) and TLCP were taken. POM (polyoxymethylene), WAX (paraffin WAX), HDPE (high density polyethylene), LDPE (low density polyethylene), PP (polypropylene) are dried under vacuum for about 24 hours, and the raw materials are all rectangular parallelepiped granules of about 0.1X0.1X0.5 cm.
Manual mixing was performed as dry pellets of POM (polyoxymethylene)/WAX (paraffin WAX)/HDPE (high density polyethylene) in a weight ratio of 7:1:2, which was then added to an internal mixer, slowly added to 20% wt TLCP, and mixed at 120℃for 30min to form mixture A.
Adding A into an extrusion mixer, continuously adding POM, and reducing the TLCP content to 10%. The extruder was maintained at 170℃and the high shear mixing screw speed was 30rpm, the length to diameter ratio of the extruder was 25, and the ports were equipped with a head assembly and a cutter assembly for continuously producing strands. The masterbatch was immediately cut into pellets of about 0.1X0.1X0.5 cm in size as it was extruded through a die,
then pass through the extruder a second time under similar conditions as the first time to reduce the TLCP content to 5% and collect the pellets again. It can be seen that the TLCP is substantially uniformly dispersed throughout the adhesive system matrix, characterized by substantially no noticeable (non-macroscopic) TLCP pieces on the surface of the pellet, and the adhesive material exhibits little or no noticeable degradation. The amount of torque required to extrude the adhesive and TLCP compound is less than the amount of torque required to extrude the adhesive alone.
Example 2
Example 2 preparation of feed POM (polyoxymethylene), WAX (paraffin WAX), HDPE (high density polyethylene), LDPE (low density polyethylene), PP (polypropylene) and TLCP were taken. POM (polyoxymethylene), WAX (paraffin WAX), HDPE (high density polyethylene), LDPE (low density polyethylene), PP (polypropylene) are dried under vacuum for about 24 hours, and the raw materials are all rectangular parallelepiped granules of about 0.1X0.1X0.5 cm.
Manual mixing was performed as dry pellets of POM (polyoxymethylene)/WAX (paraffin WAX)/LDPE (low density polyethylene)/PP (polypropylene) in a weight ratio of 7:1:1:1, which was then added to an internal mixer, slowly added to 30% wt TLCP, and mixed at 120℃for 30min to form mixture A.
Adding A into an extrusion mixer, continuously adding POM, and reducing the TLCP content to 20%. The extruder was maintained at 170℃and the high shear mixing screw speed was 30rpm, the length to diameter ratio of the extruder was 25, and the ports were equipped with a head assembly and a cutter assembly for continuously producing strands. The masterbatch was immediately cut into pellets of about 0.1X0.1X0.5 cm in size as it was extruded through a die,
then pass through the extruder a second time under similar conditions as the first time to reduce the TLCP content to 10% and collect the pellets again. It can be seen that the TLCP is substantially uniformly dispersed throughout the adhesive system matrix, characterized by substantially no noticeable (non-macroscopic) TLCP pieces on the surface of the pellet, and the adhesive material exhibits little or no noticeable degradation. The amount of torque required to extrude the adhesive and TLCP compound is less than the amount of torque required to extrude the adhesive alone.
Claims (7)
1. A method for preparing a high performance metal injection molding feed adhesive with controllable use temperature by using an ionic TLCP (thermotropic liquid crystal polymer), which is characterized in that: the adhesive is mixed with the ionic TLCP, so that the processing performance of the feeding formula is improved, and the yield of metal injection molding products is improved.
2. The method of preparing a temperature-controlled high performance metal injection molding feed adhesive according to claim 1, wherein:
the feeding formula is that the ionic TLCP is the liquid crystal polymer with ionic groups, and is formed by polycondensation of one or more of diol, diphenol or diamine, a synthetic intermediate with ionic groups (sulfonic acid group, cyano group, hydroxyl group, nitro group and trihalomethyl) and acyl chloride; the ionic groups improve the interfacial compatibility of the feed mixture and stabilize the feed system.
3. The method of preparing a temperature-controlled high performance metal injection molding feed adhesive according to claim 1, wherein:
the feeding formula selects alloy powder according to the product requirement, and comprises one or more of stainless steel, titanium alloy, kovar alloy, copper alloy, molybdenum alloy and tungsten alloy; mixing superfine alloy powder A (the particle size ranges are 0.3-1 mu m respectively) with an ionic TLCP-containing binder to form a feed; the ratio of the alloy powder to the binder is 1:25-2:25.
4. The method of preparing a temperature-controlled high performance metal injection molding feed adhesive according to claim 1, wherein:
the adhesive contains an ionic TLCP adhesive, which is prepared from TLCP, polyolefin, polyvinyl halide, nylon (crystalline and amorphous polyamide), polyester, polyaldehyde, polyfluorocarbon, polyimide, polyphenylene oxide, polyketone, polyether ketone, polyphenylene sulfide, polyethylene vinyl alcohol, polyether imide, polycarbonate, polyurethane, polystyrene, acrylic acid and methacrylic acid resin, high nitrile resin, paraffin wax and various blends of any two or more of the polymers, wherein the weight percentage of the TLCP is 1-20 percent.
5. The method of preparing a temperature-controlled high performance metal injection molding feed adhesive according to claim 1, wherein:
the adhesive is added with TLCP (105-270 ℃) with a wide liquid crystal temperature range, so that the processing temperature range of the feeding adhesive can be adjusted.
6. The method of preparing a temperature-controlled high performance metal injection molding feed adhesive according to claim 1, wherein:
firstly, under the condition that the feed has fluidity at a lower heating temperature (lower than the phase transition temperature of liquid crystal), TLCP powder is added, banburying and mixing are carried out uniformly, and a product A is formed; and then mixing and extruding the A and other adhesive components into feeding particles in the TLCP liquid crystal temperature range.
7. The method of preparing a temperature-controlled high performance metal injection molding feed adhesive according to claim 1, wherein:
in the process of feeding and injecting, after the feeding is heated and melted to generate fluidity, the temperature of the feeding is controlled in a liquid crystal phase change region and is kept warm, so that the fluidity and the processing performance of the feeding are improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310837454.3A CN116871525A (en) | 2023-07-07 | 2023-07-07 | Method for producing metal injection molding feed adhesive by using ionic TLCP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310837454.3A CN116871525A (en) | 2023-07-07 | 2023-07-07 | Method for producing metal injection molding feed adhesive by using ionic TLCP |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116871525A true CN116871525A (en) | 2023-10-13 |
Family
ID=88270893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310837454.3A Pending CN116871525A (en) | 2023-07-07 | 2023-07-07 | Method for producing metal injection molding feed adhesive by using ionic TLCP |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116871525A (en) |
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2023
- 2023-07-07 CN CN202310837454.3A patent/CN116871525A/en active Pending
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