阅读说明：本技术 一种高超声波焊接强度聚丙烯材料及其制备方法 (Polypropylene material with high ultrasonic welding strength and preparation method thereof ) 是由 姜之涛 周正发 王杰中 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种高超声波焊接强度的聚丙烯材料,包括以下重量份数的原料:聚丙烯44-82.6份、增韧剂5-20份、偶联剂1-3份、无机填充母粒8-25份、超声焊接敏化剂3-5份、热稳定剂0.2-1份、光稳定剂0.1-1份、加工助剂0.1-1份。上述制备方法为称取各原料；将各原料混合,将混合后的物料用挤出机熔融挤出、造粒即得提高超声波焊接强度聚丙烯的材料。本发明中获得的聚丙烯材料促进超声波能量的传导及热量的吸收,从而提高聚丙烯焊接面焊接强度。(The invention discloses a polypropylene material with high ultrasonic welding strength, which comprises the following raw materials, by weight, 44-82.6 parts of polypropylene, 5-20 parts of a toughening agent, 1-3 parts of a coupling agent, 8-25 parts of an inorganic filling master batch, 3-5 parts of an ultrasonic welding sensitizer, 0.2-1 part of a heat stabilizer, 0.1-1 part of a light stabilizer and 0.1-1 part of a processing aid. The preparation method comprises weighing the raw materials; mixing the raw materials, and carrying out melt extrusion and granulation on the mixed materials by using an extruder to obtain the polypropylene material for improving the ultrasonic welding strength. The polypropylene material obtained in the invention promotes the conduction of ultrasonic energy and the absorption of heat, thereby improving the welding strength of the polypropylene welding surface.)

1. The polypropylene material with high ultrasonic welding strength is characterized by comprising the following raw materials in parts by weight:

2. The polypropylene material with high ultrasonic welding strength as claimed in claim 1, wherein the toughening agent is one or more of ethylene-propylene-octene terpolymer, ethylene-propylene-diene terpolymer, styrene-butadiene copolymer and hydrogenated ethylene-butadiene-styrene copolymer.

3. The high ultrasonic welding strength polypropylene material as claimed in claim 1, wherein the coupling agent is polypropylene maleic anhydride graft.

4. the polypropylene material with high ultrasonic welding strength as claimed in claim 1, wherein the inorganic filler masterbatch is composed of 80-98 wt% of inorganic mineral and 12-20 wt% of polypropylene filler masterbatch.

5. The polypropylene material with high ultrasonic welding strength as claimed in claim 4, wherein the inorganic mineral is one or more of talc powder, calcium carbonate, wollastonite, whisker, mica and barium sulfate.

6. The high ultrasonic welding strength polypropylene material of claim 1, wherein the ultrasonic welding sensitizer is a mixture of furfuryl methacrylate and N, N '- (4,4' -methylenediphenyl) bismaleimide; the weight component ratio of the furfuryl methacrylate to the N, N '- (4,4' -methylene diphenyl) bismaleimide is 1 (0.5-2).

7. the polypropylene material with high ultrasonic welding strength as claimed in claim 1, wherein the heat stabilizer is any one of phenols, amines, phosphites, hindered phenols, complexes of acryloyl functional groups and thioesters, and calixarenes.

8. The polypropylene material with high ultrasonic welding strength as claimed in claim 1, wherein the light stabilizer is hindered amine and/or ultraviolet absorber.

9. A preparation method of a polypropylene material with high ultrasonic welding strength is characterized by comprising the following steps:

Weighing the raw materials according to the parts by weight of the polypropylene material with high ultrasonic welding strength as defined in any one of claims 1 to 8;

And (2) mixing the raw materials in the step (1), and performing melt extrusion and granulation on the mixed materials by using an extruder to obtain the polypropylene material for improving the ultrasonic welding strength.

10. The method for preparing a polypropylene material with high ultrasonic welding strength as claimed in claim 9, wherein in the extruder in the step (2), the temperature of the feeding section is 160 ℃ to 180 ℃, the temperature of the compression section is 170 ℃ to 190 ℃, the temperature of the plasticizing section is 180 ℃ to 190 ℃, the temperature of the homogenizing section is 190 ℃ to 200 ℃, and the temperature of the die opening is 190 ℃ to 200 ℃.

Technical Field

The invention relates to the technical field of polymer composite materials, in particular to a polypropylene modified material with high ultrasonic welding strength and a preparation method thereof.

background

The polypropylene (PP) has simple and convenient synthesis process, good balance, easy processing, excellent performance and low price, and becomes one of the fastest-developing varieties in plastics.

Ultrasonic welding is a kind of thermal welding, and the outstanding advantage shows: the welding method has the advantages of high speed, high efficiency, low energy consumption and high welding strength, can achieve the strength of the material, and does not need to add solvents, adhesives or other auxiliary products during welding; the welding material has no surface damage, the operation is simple, and the mechanization and the automation are convenient to realize; the method is widely applied to the fields of automobiles, electronics, aerospace and the like.

The main factor influencing ultrasonic welding is the heat transfer property of plastic, the plastic with good transferability is easy to weld than the plastic with poor transferability, the heat conductivity of polypropylene is poor, under the ordinary condition, the welding strength of a welding surface can be increased by increasing the welding time, increasing the ultrasonic vibration frequency, prolonging the welding time and the like, but under certain special conditions, welding equipment cannot be set differently according to different materials, when the welding strength of the materials cannot meet the design requirements, proper adjustment needs to be carried out from the angle of the materials, the ultrasonic welding process is realized, the loss modulus is improved, the melting degree of the materials of the welding surface is increased, and further the welding depth and the welding strength are increased. In the aspect of materials, the method for modifying the heat-conducting polypropylene material is to add aluminum oxide and silicon carbide, but the adding proportion is more than 50%, other mechanical properties of the material are greatly influenced, the cost is very high, and the material cannot be applied to common modified polypropylene products needing to be welded.

Therefore, how to provide a polypropylene material with high ultrasonic welding strength is a problem to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a polypropylene material with high ultrasonic welding strength. In order to achieve the purpose, the invention adopts the following technical scheme: the polypropylene material with high ultrasonic welding strength is characterized by comprising, by weight, 41-82.6 parts of polypropylene, 5-20 parts of a toughening agent, 1-3 parts of a coupling agent, 8-25 parts of an inorganic filling master batch, 3-5 parts of an ultrasonic welding sensitizer, 0.2-1 part of a heat stabilizer, 0.1-1 part of a light stabilizer and 0.1-1 part of a processing aid.

The invention has the beneficial effects that: according to the invention, the furfuryl methacrylate and the N, N '- (4,4' -methylene diphenyl) bismaleimide are added in the base material modification process, and the cycloaddition effect of the conjugated diene and the dienophile of the furfuryl methacrylate and the N, N '- (4,4' -methylene diphenyl) bismaleimide, namely Diels-Alder reaction, is utilized, so that the surface of a welding part is subjected to a crosslinking reaction under the heated condition, and a crosslinking structure is generated on the material, so that the welding strength is higher.

The crosslinking reaction is:

Preferably, the toughening agent is any one or a mixture of several of ethylene-propylene-octene terpolymer, ethylene-propylene-diene terpolymer, styrene-butadiene copolymer and hydrogenated ethylene-butadiene-styrene copolymer. More preferably, POE8200 and POE8842 are available.

Preferably, the coupling agent is a polypropylene maleic anhydride graft.

Preferably, the inorganic filling master batch consists of 80-98% of inorganic mineral and 12-20% of polypropylene filling master batch by weight percentage. More preferably, the inorganic filling master batch is 80 weight percent of talcum powder master batch.

Preferably, the ultrasonic welding sensitizer is a mixture of furfuryl methacrylate and N, N '- (4,4' -methylenediphenyl) bismaleimide; the weight component ratio of the furfuryl methacrylate to the N, N '- (4,4' -methylene diphenyl) bismaleimide is 1 (0.5-2).

Preferably, the heat stabilizer is any one of hindered phenols, hindered amines, phosphites, complexes of acryloyl functional groups and thioesters, and calixarenes. More preferably, the hindered phenol is hindered phenol 1010 and/or hindered phenol 1076, the hindered amine is hindered amine 944 and/or hindered amine 770, the phosphite is Irgafos168/IrgafosP-EPQ, and the thioester compound is DSTDP and/or DLTDP.

Preferably, the light stabilizer is a hindered amine and/or an ultraviolet absorber. More preferably, the hindered amine is any one or a mixture of several of poly- [6- (1,1,3, 3-tetramethylbutyl) -imino ] -1,3, 5-triazine-2, 4-dimethyl ], [2- (2-2,6, 6-tetramethylpiperidyl) -sulfenyl ] -hexamethylene- [4- (2, 2,6, 6-tetramethylpiperidyl) ] -sulfenyl and N-alkylated and piperazinone structured compounds; the ultraviolet absorbent is benzotriazole and/or benzophenone. More preferably, the benzotriazole is any one or a mixture of several of UV-P, UV-326, UV-327 and UV-360; the benzophenone is UV-244 and/or UV-531.

Preferably, the processing aid is calcium stearate, zinc stearate or erucamide, more preferably calcium stearate.

The invention also provides a preparation method of the polypropylene material with high ultrasonic welding strength, which comprises the following steps:

Weighing raw materials according to the parts by weight of the high-ultrasonic-welding-strength polypropylene material;

And (2) mixing the raw materials in the step (1), and performing melt extrusion and granulation on the mixed materials by using an extruder to obtain the polypropylene material with improved ultrasonic welding strength.

the preparation method is simple, easy to operate and suitable for large-scale industrial production.

Preferably, in the extruder in the step (2), the temperature of a feeding section is 160-180 ℃, the temperature of a compression section is 170-190 ℃, the temperature of a plasticizing section is 180-190 ℃, the temperature of a homogenizing section is 190-200 ℃, and the temperature of a die orifice is 190-200 ℃.

Preferably, the raw materials are mixed in step (2) by using a high-speed mixer at the rotation speed of 650-.

Preferably, the extruder in the step (2) is a twin-screw extruder, the rotating speed is 250-400rpm, the barrel temperature is 160-200 ℃, and the water temperature of the water tank is as follows: 20-50 ℃.

Preferably, a granulator is selected for granulation after granulation, and the rotation speed is 600-900 rpm.

According to the technical scheme, compared with the prior art, the invention discloses the polypropylene material with high ultrasonic welding strength and the preparation method thereof. The added ultrasonic welding sensitizer has extremely small addition amount, does not influence the comprehensive mechanical properties of the material, and has low modification cost, thereby having extremely deep application value in the application field of required ultrasonic welding. The conduction of ultrasonic energy and the absorption of heat are promoted, so that the welding strength of the polypropylene welding surface is improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following examples, the polypropylene is block-copolymerized with a Basel melt flow rate (230 ℃ C. times.2.16 KG) of 0.5 to 60g/10 min. The CAS number of the furfuryl methacrylate is 3454-28-2, and the CAS number of the N, N '- (4,4' -methylenediphenyl) bismaleimide is 13676-54-5; the furfuryl methacrylate is preferably a product commercially available from Huaxia reagent company, and the N, N '- (4,4' -methylenediphenyl) bismaleimide is preferably a product commercially available from Wuhan Yao Tonghe Chemicals company, Inc.