CN107418197B - Heat-conducting nylon engineering plastic and preparation method thereof - Google Patents

Heat-conducting nylon engineering plastic and preparation method thereof Download PDF

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CN107418197B
CN107418197B CN201710255936.2A CN201710255936A CN107418197B CN 107418197 B CN107418197 B CN 107418197B CN 201710255936 A CN201710255936 A CN 201710255936A CN 107418197 B CN107418197 B CN 107418197B
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heat
plasticizer
nylon
engineering plastic
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CN107418197A (en
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冉进成
刘典典
官炳荣
官炳桂
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Guangdong Huaju Technology Co ltd
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Huaju Plastics Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/02Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2217Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224Magnesium hydroxide
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/02Flame or fire retardant/resistant

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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Abstract

The invention discloses a heat-conducting nylon engineering plastic and a preparation method thereof. The engineering plastic comprises the following components in parts by weight: 100 parts of nylon matrix resin; 150-300 parts of magnesium hydroxide; 2-10 parts of a toughening agent; 1-20 parts of a plasticizer; 0-5 parts of a processing aid. The preparation method comprises the steps of mixing the toughening agent, the plasticizer, the processing aid and the nylon matrix resin, granulating by a double-screw extruder, and adding the magnesium hydroxide from the middle section of the side surface of the extruder through forced feeding. The heat-conducting engineering plastic prepared by the invention has excellent toughness and flame retardant property, good ductility and low cost, and can be applied to injection molding for preparing LED lamp radiators and other electronic and electric parts needing heat dissipation.

Description

Heat-conducting nylon engineering plastic and preparation method thereof
Technical Field
The invention relates to the field of polymer composite materials, in particular to a heat-conducting nylon engineering plastic with excellent toughness and a preparation method thereof.
Background
The heat-conducting polymer composite material has the advantages of simple processing and forming, low density, corrosion resistance, good insulating property and the like, and becomes a preferable material for solving the problem of heat dissipation of the LED lamp. With the rapid development of scientific technology, the demand for polymer materials with excellent thermal conductivity is increasing. However, the development of the existing heat-conducting polymer materials still faces many problems, for example, when the filling amount of the existing filling type heat-conducting materials which are researched more intensively is large, the physical and mechanical properties of the materials are obviously reduced, and the materials become seriously brittle, so that the application of the materials is greatly limited.
Magnesium hydroxide [ Mg (OH)2Abbreviated as MH]Belongs to an additive inorganic flame retardant, and compared with the similar inorganic flame retardants, the flame retardant has excellent flame retardant effect on high polymer materialsBesides, the magnesium hydroxide can also inhibit the generation of toxic gases such as smoke, hydrogen halide and the like, namely, the magnesium hydroxide has triple functions of flame retardance, smoke abatement and filling, and has the characteristics of no toxicity, no corrosion and the like. MH has higher decomposition temperature (300-320 ℃), is not easy to decompose at the melting processing temperature of nylon, and is an ideal flame retardant for flame-retardant nylon. The amount added is often very high (typically 60% to 200% of the resin) to achieve a certain flame retardant rating. Because magnesium hydroxide has large polarity and poor compatibility with a base material, the processing performance of the polymer and the mechanical property of the polymer are influenced by high addition amount.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a heat conductive nylon engineering plastic with excellent processability and toughness and a preparation method thereof. The heat-conducting nylon engineering plastic with excellent processability and toughness is obtained by matching and using the toughening agent and the plasticizer.
In a first aspect, the invention provides a heat-conducting nylon engineering plastic with excellent toughness, which comprises the following components in parts by weight:
Figure BDA0001272617320000021
the plasticizer is N- (2-hydroxypropyl) benzene sulfonamide.
Preferably, the paint comprises the following components in parts by weight:
Figure BDA0001272617320000022
the plasticizer is N- (2-hydroxypropyl) benzene sulfonamide.
Preferably, the matrix resin is one or more of nylon 6(PA6), nylon 66(PA66), nylon 610(PA610), nylon 612(PA612), nylon 1010(PA1010) and nylon 1212(PA 1212).
Preferably, the magnesium hydroxide is prepared by a chemical method or a mineral method, the particle size is 0.5-5 microns, and the surface of the magnesium hydroxide is treated by a silane coupling agent.
Preferably, the toughening agent is a vinyl graft or copolymer.
More preferably, the toughening agent is one or two of polyethylene grafted maleic anhydride (PE-MAH), polyethylene octene copolymer grafted maleic anhydride (POE-MAH), hydrogenated styrene-butadiene-styrene triblock copolymer grafted maleic anhydride (SEBS-MAH), ethylene-acrylate-glycidyl methacrylate copolymer (E-BA-GMA) and ethylene-glycidyl methacrylate copolymer (E-GMA).
Preferably, the processing aid is selected from one or more of an antioxidant, a heat stabilizer, a lubricant and a toner.
More preferably, the antioxidant is 1010 and 168, the heat stabilizer is SEED, and the lubricant is pentaerythritol tetrastearate.
In a second aspect, the invention provides a preparation method of a heat-conducting nylon engineering plastic with excellent toughness, which comprises the following steps:
step 1: the following components are taken according to parts by weight: 100 parts of nylon matrix resin; 150-250 parts of magnesium hydroxide; 2-10 parts of a toughening agent; 1-20 parts of a plasticizer; 0-5 parts of a processing aid. (ii) a
Step 2: adding nylon matrix resin and a toughening agent into a mixer, and continuously stirring for 1-3 minutes;
and step 3: adding a plasticizer into the mixer, and continuously stirring for 1-3 minutes;
and 4, step 4: adding a processing aid into the mixer, and continuously stirring for 1-2 minutes;
and 5: and respectively adding the mixture and the insulating heat-conducting filler into a main feeding hopper and a side feeding hopper of the extruder, and extruding and granulating to obtain the heat-conducting nylon engineering plastic with excellent toughness.
The heat-conducting nylon engineering plastic with excellent toughness provided by the invention has the following beneficial effects:
(1) the toughening agent and the plasticizer are matched for use, so that the toughness of the heat-conducting nylon composite material is well improved, and compared with the toughening of a simple toughening agent, the influence of the addition of the plasticizer on the heat-conducting property and the flame retardant property is small.
(2) The N- (2-hydroxypropyl) benzene sulfonamide plasticizer does not belong to an environmentally-friendly limited o-benzene plasticizer, and the addition of the plasticizer improves the coating capability of the resin on the powder, and is safe and environmentally-friendly. The hydrogen bonding effect between nylon molecular chains is influenced, and the nylon becomes softer.
(3) The heat-conducting nylon engineering plastic provided by the invention has the advantages that the processing current is reduced by about 20% compared with the normal current due to the addition of the liquid plasticizer, the productivity is improved, the energy is saved, and the cost performance of the product is higher.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a heat-conducting nylon engineering plastic which has excellent toughness. The composition comprises the following components: 100 parts of nylon matrix resin; 150-250 parts of magnesium hydroxide; 2-10 parts of a toughening agent; 1-20 parts of a plasticizer; 0-5 parts of a processing aid.
In the formulations of the examples and comparative examples, PA6 is available under the trademark PA6M200, manufactured by Nippon Mada; the magnesium hydroxide is HO 12FM, produced by Jiangsu Ettke company; the toughening agent SEBS-g-MAH is of the mark
Figure BDA0001272617320000041
FG1901, manufactured by kraton, usa; plasticizer grade 2102, produced by Proviron corporation, belgium; the processing aid is an antioxidant 1098: antioxidant 168: the lubricant is a mixture of 1:1:2, wherein the antioxidant 1098 and the antioxidant 168 are produced by BASF company in Germany, and the lubricant is pentaerythritol stearate with the mark number of
Figure BDA0001272617320000042
P (ETS), manufactured by Lonza, USA.
Example 1
A heat-conducting nylon engineering plastic with excellent toughness is prepared by the following steps: adding the PA6 resin and the toughening agent into a mixer, and stirring for 2 min; then adding a plasticizer into the mixer, and continuously stirring for 2 min; adding antioxidant and lubricant into the mixer, and stirring for 2 min; adding the mixture into a main feeding hopper of a double-screw extruder, and adding magnesium hydroxide into a side feeding hopper of the double-screw extruder; extruding and granulating, setting the temperature to be 220-260 ℃, preparing high-toughness heat-conducting nylon 6 engineering plastic particles, and testing the performance by injection molding.
Examples 2 to 4
The preparation method is the same as that of example 1, except that the components and the dosage are different, and the specific reference is made to table 1.
Comparative example 1
An insulating engineering plastic is prepared by the following steps: adding the PA6 resin and the toughening agent into a mixer, and stirring for 2 min; adding antioxidant and lubricant into the mixer, and stirring for 2 min; adding the mixture into a main feeding hopper of a double-screw extruder, and adding magnesium hydroxide into a side feeding hopper of the double-screw extruder; extruding and granulating, setting the temperature to be 220-260 ℃, preparing high-toughness heat-conducting nylon 6 engineering plastic particles, and testing the performance by injection molding.
Comparative example 2
The preparation method is the same as that of comparative example 1, only the differences of the components and the dosage are shown in Table 1.
TABLE 1 Components and parts by weight (unit: parts) of examples 1 to 4 and comparative examples 1 to 2
Matrix resin Magnesium hydroxide Toughening agent Plasticizer Processing aid
Example 1 100 150 2 1 0
Example 2 100 250 2 1 0
Example 3 100 200 10 10 2
Example 4 100 250 10 20 5
Comparative example 1 100 200 10 0 2
Comparative example 2 100 200 0 10 2
Effects of the embodiment
The products obtained in examples 1-4 and comparative examples 1-2 were injection molded to prepare standard test sample strips, and the test results are shown in Table 2.
TABLE 2 Performance test results of examples 1 to 4 and comparative examples 1 to 2
Figure BDA0001272617320000051
In comparative example 1, a toughening agent is added, no plasticizer is added, and the material has strong rigidity and weak deformability.
In the comparative example 2, the plasticizer is used for replacing the toughening agent, the rigidity of the material is reduced, the elongation at break and the deflection are improved, the heat conductivity coefficient is also higher, and the extrusion current is reduced by 20%.
From examples 1-4, it can be seen that the addition of the toughening agent and the plasticizer greatly reduces the flexural modulus of the material, and the impact strength, the elongation at break and the deflection are all significantly increased, indicating that the ductility of the material becomes better and the deformation resistance is enhanced. The tensile strength of the composite material is always kept above 40MPa, which is higher than that of general plastics (such as polypropylene PP), and the requirement of products such as LED radiators and the like on the strength can be met. In example 3, the addition of the plasticizer reduced the extrusion current by about 10% compared to comparative example 1, but had substantially no effect on the thermal conductivity. The reduction in current means that the material is more fluid, that lower processing temperatures can be used or that a greater capacity is obtained, and is therefore very significant in terms of energy consumption and production efficiency.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (3)

1. The heat-conducting nylon engineering plastic is characterized by comprising the following components in parts by weight:
100 parts of nylon matrix resin;
150-250 parts of magnesium hydroxide;
2-10 parts of a toughening agent;
1-20 parts of a plasticizer;
0-5 parts of a processing aid;
the plasticizer is N- (2-hydroxypropyl) benzene sulfonamide;
the nylon matrix resin is one or a mixture of more than one of PA6, PA66, PA612 and PA 610;
the magnesium hydroxide is prepared by a chemical method or a mineral method, the particle size is 0.5-5 microns, and the surface of the magnesium hydroxide is treated by a silane coupling agent;
the toughening agent is one or two of polyethylene grafted maleic anhydride (PE-MAH), polyethylene octene copolymer grafted maleic anhydride (POE-MAH), hydrogenated styrene-butadiene-styrene triblock copolymer grafted maleic anhydride (SEBS-MAH), ethylene-acrylate-glycidyl methacrylate copolymer (E-BA-GMA) and ethylene-glycidyl methacrylate copolymer (E-GMA);
the processing aid is selected from one or more of an antioxidant, a heat stabilizer, a lubricant and a toner;
the lubricant is pentaerythritol tetrastearate;
the heat stabilizer is SEED.
2. The heat-conducting nylon engineering plastic as claimed in claim 1, which is characterized by comprising the following components in parts by weight:
100 parts of nylon matrix resin;
200 parts of magnesium hydroxide;
10 parts of a toughening agent;
10 parts of a plasticizer;
and 2 parts of a processing aid.
3. The preparation method of the heat-conducting nylon engineering plastic as claimed in any one of claims 1-2, characterized by comprising the following steps:
step 1: taking the following components in parts by weight: nylon matrix resin; magnesium hydroxide; a toughening agent; a plasticizer; a processing aid;
step 2: adding nylon matrix resin and a toughening agent into a mixer, and continuously stirring for 1-3 minutes;
and step 3: adding a plasticizer into the mixer, and continuously stirring for 1-3 minutes;
and 4, step 4: adding a processing aid into the mixer, and continuously stirring for 1-2 minutes;
and 5: and respectively adding the mixture and the magnesium hydroxide into a main feeding hopper and a side feeding hopper of the extruder, and extruding and granulating to obtain the heat-conducting nylon engineering plastic with excellent toughness.
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CN108178922A (en) * 2017-12-28 2018-06-19 南京鸿瑞塑料制品有限公司 One kind is for super flexible PA6 composite materials of car floor boring cover and preparation method thereof
CN111171563A (en) * 2020-03-06 2020-05-19 广州华新科智造技术有限公司 Polyamide material and preparation method thereof
CN112430391A (en) * 2020-11-23 2021-03-02 山东星达新材料有限公司 Super-tough super-low temperature-resistant super-wear-resistant flexible nylon alloy material and preparation method thereof
CN112724662B (en) * 2020-12-08 2022-12-06 金发科技股份有限公司 Toughened wear-resistant polyamide composition and preparation method and application thereof

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Address after: 512529 No. 3 Zhongtai Road, Shashui Industrial Park, Shixing County, Shaoguan City, Guangdong Province

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Address before: 516127 Jiaoyuan Industrial Zone, Jiaoxian Village, Shiwan, Boluo County, Huizhou City, Guangdong Province

Patentee before: HUAJU PLASTICS TECHNOLOGY CO.,LTD.

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