CN112694736B - Polycarbonate molding with high welding strength and preparation method thereof - Google Patents
Polycarbonate molding with high welding strength and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a polycarbonate molding with high welding strength and a preparation method thereof, wherein the molding comprises the following components in parts by weight: 30-70 parts of polycarbonate resin with the molecular weight of 25000 and 28000; 30-70 parts of polycarbonate resin with the molecular weight of 18000-21000; 0.2-0.8 part of welding enhancement additive A; 0.2-1 part of welding enhancing additive B; 0.1-0.5 part of antioxidant. The molding disclosed by the invention adopts the method of mixing the polycarbonates with different molecular weights and adding two types of welding enhancing additives to improve the melt strength and melt stability of the polycarbonate, thereby improving the ultrasonic welding strength of the polycarbonate and widening the process window of ultrasonic welding of the polycarbonate.
Description
Technical Field
The invention relates to the field of processing of high polymer materials, in particular to a polycarbonate molding with high welding strength and a preparation method thereof.
Background
Ultrasonic waves, when applied to a thermoplastic contact surface, generate high frequency vibrations of several tens of thousands per second, which reach a certain amplitude and transmit ultrasonic energy through the weld to the weld, which generates localized high temperatures due to the high acoustic resistance at the weld, i.e. at the interface between the two welds. And because the plastic has poor thermal conductivity, the plastic cannot be diffused in time and is gathered in a welding area, so that the contact surfaces of the two plastics are quickly melted, and the two plastics are fused into a whole after a certain pressure is applied.
Ultrasonic welding is a convenient and fast welding mode, and is widely applied to the fields of automobiles, power adapters and the like at the present stage. The power adapter shell usually uses the polycarbonate material, when carrying out ultrasonic bonding, because polycarbonate self glass transition temperature is high, and melt strength and melt stability are relatively poor, appear easily that welding strength hangs down the scheduling problem, and then influence the use of power adapter product.
Disclosure of Invention
In order to solve the technical problems, the invention provides a polycarbonate molding with high welding strength and a preparation method thereof, so as to achieve the purposes of improving the melt strength and stability of polycarbonate during ultrasonic welding and improving the ultrasonic welding strength of the polycarbonate.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a polycarbonate molding with high welding strength comprises the following components in parts by weight:
30-70 parts of polycarbonate resin with the molecular weight of 25000 and 28000; 30-70 parts of polycarbonate resin with the molecular weight of 18000-21000; 0.2-0.8 part of welding enhancement additive A; 0.2-1 part of welding enhancing additive B; 0.1-0.5 part of antioxidant.
In the scheme, the welding enhancing additive A is one or more selected from calcium carbonate, kaolin, talc, aluminum hydroxide, silica, glass spheres or mica.
In the scheme, the welding enhancement additive B is selected from one or more of PTFE, PE and PF.
Preferably, the welding enhancing additive A is ultrafine talcum powder or active coated calcium carbonate.
Further, the D50 of the superfine talcum powder is 1-3 μm.
Preferably, the weld enhancing additive B is PTFE having a molecular weight of 300-500 ten thousand.
In the scheme, the antioxidant is selected from one or more of hydroquinone, thiobisphenol, triphenol, trimethyl phosphite and dialkyl phosphite.
Further, the phenolic antioxidant is selected from one or more of hydroquinone, thiobisphenol and triphenol.
In the above scheme, the viscosity of the polycarbonate resin with molecular weight of 25000-28000 is 0.650-0.780 dL/g; the viscosity of the polycarbonate resin with the molecular weight of 18000-21000 is 0.320-0.630 dL/g.
A method for preparing the polycarbonate molding with high welding strength comprises the following steps:
and (3) mixing the substances in percentage by weight, feeding the mixture into a double-screw extruder, and carrying out melt extrusion and granulation to obtain the polycarbonate molding with high welding strength.
The action mechanism of the invention is as follows:
the glass transition temperature of the polycarbonate is reduced, the melt strength is improved by adding the welding enhancing additive A and the welding enhancing additive B, the melt strength is ensured without adding an internal lubricant, and the lubricant is prevented from reducing the transmission efficiency of ultrasonic waves in a base material. Meanwhile, a reactive compatilizer is added and is combined in a chemical bond mode, so that the compatibility of the special welding enhancement additive and the matrix is improved.
The welding reinforcing agent active coated calcium carbonate or superfine talcum powder is added, so that the rigid component in the alloy can be increased, the melt strength of the material is effectively improved, and the ultrasonic energy transmission in the welding process is facilitated. The coated small-particle-size welding reinforcing agent prevents the antioxidant from being separated out and influences the appearance of the welding surface. The aliphatic polycarbonate resin is in a linear molecular structure, and after the welding reaches the melting point, the glass transition temperature of dissimilar materials is similar, so that better compatibility brings stronger welding strength.
Compared with the prior art, the polycarbonate molding provided by the invention utilizes the polycarbonate with low glass transition temperature to improve the compatibility of the whole molding and a power adapter; and a proper amount of cladding type and small-particle-size welding reinforcing additives are added, so that the melt strength is improved, and meanwhile, the melting point of the polycarbonate alloy is close to that of a power adapter by adding the reaction type compatilizer, so that the melt strength is improved, and the performance of high ultrasonic welding strength is achieved. And can be applied to a wide range of ultrasonic welding conditions.
The addition of the antioxidant can effectively block air, and prevent oxygen from entering a welding area to influence the welding effect. Meanwhile, the addition amount of the antioxidant cannot exceed 0.5 part, and excessive antioxidant can affect the performance of the welding reinforcing agent, so that the brittleness of a welded molded product is easily enhanced, and the molded product is easy to crack. The two welding reinforcing agents belong to different types of reinforcing agents, and the welding reinforcing additive A is inorganic powder and is beneficial to increasing the lubricating property; the welding reinforcing additive B is a resin reinforcing agent and has good heat resistance and cold resistance, the two welding reinforcing additives are matched with each other, the welding reinforcing additive A can play a good reinforcing effect within the dosage range of 0.2-0.8 part of the welding reinforcing additive A and 0.2-1 part of the welding reinforcing additive B, and experiments prove that the cost is increased and the welding strength is greatly reduced after the dosage range is exceeded.
Through the technical scheme, the polycarbonate molding with high welding strength and the preparation method thereof provided by the invention have the following beneficial effects:
(1) the invention adopts the polycarbonate resins with different molecular weights, the viscosity of the polycarbonate resins is different due to the difference of the molecular weights, and the two kinds of polycarbonate resins with different viscosities are intertwined, restricted and balanced, so that the stability of the polycarbonate melt during ultrasonic welding can be improved.
(2) The invention adopts the superfine talcum powder, which is beneficial to improving the melt strength of polycarbonate during welding.
(3) The addition of high molecular weight PTFE in the invention is helpful for improving the melt strength of polycarbonate during welding.
According to the invention, the polycarbonate with different molecular weights is mixed, and the melt strength and the melt stability of the polycarbonate are improved by adding the superfine talcum powder and the high molecular weight PTFE, so that the ultrasonic welding strength of the polycarbonate is improved, and the process window of ultrasonic welding of the polycarbonate is widened.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below.
Example 1
Polycarbonate resin: 30 portions of PC 1300-03 with molecular weight of 25000 and viscosity of 0.650 dL/g;
polycarbonate resin: PC 1300-22 has molecular weight of 21000, viscosity of 0.620dL/g, 70 parts;
welding enhancing additive A: 0.2 portion of aluminum hydroxide with the D50 being 1 mu m;
welding enhancing additive B: PTFE with the molecular weight of 300 ten thousand and 1 part;
antioxidant: 0.5 part of hydroquinone.
Example 2
Polycarbonate resin: PC 1300-03 molecular weight 28000, viscosity 0.780dL/g, 70 parts;
polycarbonate resin: 30 portions of PC 1300-22 with the molecular weight of 18000 and the viscosity of 0.320 dL/g;
welding enhancing additive A: 0.8 part of active coated calcium carbonate D50 with the particle size of 3 mu m;
welding enhancing additive B: PF, molecular weight 500 ten thousand, 0.2 portion;
antioxidant: 0.1 part of trimethyl phosphite.
Example 3
Polycarbonate resin: PC 1300-03 molecular weight 26500, viscosity 0.700dL/g, 70 parts;
polycarbonate resin: 30 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 0.5 portion of superfine talcum powder D50 with the diameter of 3 mu m;
welding enhancing additive B: PTFE with molecular weight of 300 ten thousand and 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Example 4
Polycarbonate resin: PC 1300-03 molecular weight 26500, viscosity 0.700dL/g, 70 parts;
polycarbonate resin: 30 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 0.5 portion of aluminum hydroxide with the D50 being 3 mu m;
welding enhancing additive B: PE with molecular weight of 300 ten thousand in 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Example 5
Polycarbonate resin: the molecular weight of PC 1300-03 is 26500, the viscosity is 0.700dL/g, and 70 parts are used;
polycarbonate resin: 30 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 0.5 portion of superfine talcum powder D50 with the diameter of 5 mu m;
welding enhancing additive B: PE with molecular weight of 300 ten thousand in 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Comparative example 1
Polycarbonate resin: PC 1300-03 with molecular weight 22000 and viscosity 0.700dL/g in 70 weight portions;
polycarbonate resin: 30 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 0.5 portion of superfine talcum powder D50 with the diameter of 3 mu m;
welding enhancing additive B: PTFE with molecular weight of 300 ten thousand and 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Comparative example 2
Polycarbonate resin: PC 1300-03 molecular weight 26500, viscosity 0.650dL/g, 70 parts;
polycarbonate resin: PC 1300-22 has molecular weight 22000, viscosity 0.670dL/g, 30 portions;
welding enhancing additive A: 0.5 portion of superfine talcum powder D50 with the diameter of 3 mu m;
welding enhancing additive B: PTFE with molecular weight of 300 ten thousand and 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Comparative example 3
Polycarbonate resin: PC 1300-03 molecular weight 26500, viscosity 0.700dL/g, 80 portions;
polycarbonate resin: 20 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 0.5 portion of superfine talcum powder D50 with the diameter of 3 mu m;
welding enhancing additive B: PTFE with molecular weight of 300 ten thousand and 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Comparative example 4
Polycarbonate resin: PC 1300-03 molecular weight 26500, viscosity 0.700dL/g, 70 parts;
polycarbonate resin: 30 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 1 part of superfine talcum powder D50 with the particle size of 3 mu m;
welding enhancing additive B: PTFE with molecular weight of 300 ten thousand and 0.6 portion;
antioxidant: dialkyl phosphite, 0.3 part.
Comparative example 5
Polycarbonate resin: PC 1300-03 molecular weight 26500, viscosity 0.700dL/g, 70 parts;
polycarbonate resin: 30 portions of PC 1300-22 with molecular weight of 20000 and viscosity of 0.510 dL/g;
welding enhancing additive A: 0.5 portion of superfine talcum powder D50 with the diameter of 3 mu m;
welding enhancing additive B: PTFE with molecular weight of 300 ten thousand and 1.2 portions;
antioxidant: dialkyl phosphite, 0.3 part.
And respectively mixing the substances in the weight percentage, feeding the mixture into a double-screw extruder, carrying out melt extrusion and granulating to obtain the molding materials of the examples and the comparative examples.
The moldings obtained in examples 1 to 5 and comparative examples 1 to 5 were injection-molded into 100mm by 50mm by 4mm welded bars by performing a welding test on the moldings of the above examples and comparative examples, and the two power adapters were put together and welded by an ultrasonic instrument. The amplitude was 25KHZ, the welding time was 0.3s, and the dwell time was 0.5 s. And clamping the welding sample strip by using one end of a clamp of the tensile testing machine, clamping a power adapter by using one end of the clamp, and evaluating the welding strength by measuring the tensile strength when the welding seam is broken, wherein the welding tensile force is the maximum force when the welding sample strip is broken. The test results are shown in Table 1.
Table 1 examples and comparative welding tensions and conditions
As can be seen from the above table, the welding tension of the polycarbonate molding of the inventive example is significantly higher than that of the comparative example, and the welding range of the inventive example is also significantly wider than that of the comparative example. In the case where the molecular weight range or the raw material amount range defined in the present invention is exceeded in the comparative example, the welding tension is remarkably decreased and the welding conditions are remarkably narrowed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A polycarbonate molding with high welding strength is characterized by comprising the following components in parts by weight:
30-70 parts of polycarbonate resin with the molecular weight of 25000-28000 and the viscosity of 0.650-0.780 dL/g; 30-70 parts of polycarbonate resin with the molecular weight of 18000-21000 and the viscosity of 0.320-0.630 dL/g; 0.2-0.8 part of welding enhancement additive A; 0.2-1 part of welding enhancing additive B; 0.1-0.5 part of antioxidant;
the welding enhancement additive A is selected from any one of superfine talcum powder with D50 of 1-3 mu m, aluminum hydroxide with D50 of 1 mu m, aluminum hydroxide with D50 of 3 mu m and active coated calcium carbonate with D50 of 3 mu m;
the welding enhancement additive B is any one selected from PTFE with molecular weight of 300-500 ten thousand, PF with molecular weight of 500 ten thousand and PE with molecular weight of 300 ten thousand.
2. The polycarbonate molding with high weld strength according to claim 1, wherein the antioxidant is a phenolic antioxidant and/or a phosphite.
3. The polycarbonate molding with high weld strength according to claim 2, wherein the antioxidant is one or more selected from hydroquinone, thiobisphenol, triphenol, trimethyl phosphite, and dialkyl phosphite.
4. A method for producing a polycarbonate molding with high weld strength according to claim 1, comprising the steps of:
and (3) mixing the substances in parts by weight, feeding the mixture into a double-screw extruder, and carrying out melt extrusion and granulation to obtain the polycarbonate molding with high welding strength.
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| CN105440639B (en) * | 2015-12-24 | 2018-01-26 | 上海锦湖日丽塑料有限公司 | A kind of polycarbonate compositions of laser welding easy processing and preparation method thereof |
| CN106751409B (en) * | 2016-12-27 | 2019-05-24 | 上海锦湖日丽塑料有限公司 | A kind of polycarbonate alloy and preparation method thereof of praetersonic weld strength |
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