CN118359920A - An infrared light-transmitting polyamide composite material and its preparation method and application - Google Patents
An infrared light-transmitting polyamide composite material and its preparation method and application Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K5/05—Alcohols; Metal alcoholates
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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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Abstract
The invention discloses an infrared light-transmitting polyamide composite material, and a preparation method and application thereof. The polyamide composite material comprises the following raw materials in percentage by weight, namely polyamide, a visible light absorber, an ultraviolet absorber and an optical anti-reflection agent; wherein the weight percentage of the visible light absorber and the ultraviolet absorber in the raw materials is 0.1-1.0 percent respectively; the weight percentage of the optical anti-reflection agent in the raw materials is 0.5-5%, the optical anti-reflection agent comprises metal chloride and polyhydroxy compound, and the polyhydroxy compound comprises one or more of pentaerythritol, dipentaerythritol and polypentaerythritol. The infrared light-transmitting polyamide composite material has higher infrared light transmittance under the condition of ensuring better processability, and can cut off visible light and ultraviolet rays.
Description
Technical Field
The invention belongs to the field of modified polyamide materials, and particularly relates to an infrared light-transmitting polyamide composite material, and a preparation method and application thereof.
Background
The infrared transmitting plastic, also called infrared transmitting plastic, is characterized by giving a black visual sense in the visible light range (400-700 nm visible light transmittance less than 1%), but transmitting in the near infrared region at wavelengths above 800-1600nm, the infrared transmittance may vary from 80% to 93% depending on the thickness of the part, the operating band and the color requirements. The infrared penetrating plastic can be applied to the fields of infrared communication, infrared shooting, infrared night vision, infrared navigation, infrared welding, infrared heat energy adjustment and the like.
Most of known infrared light transmitting plastics are black, purplish red or deep red materials formed by resin modification PC, PMMA, GPPS. Among various polymer materials, polyamide is a very important engineering plastic with excellent mechanical properties, thermal properties and corrosion resistance, and has a very wide application range, and relates to various industries such as industrial manufacturing, agricultural production, mechanical manufacturing, electronic and electric appliances, automobile manufacturing and the like. If the infrared light-transmitting polyamide composite material can be provided, the infrared light is allowed to transmit, and the visible light and the ultraviolet light are cut off, the application field of the polyamide is greatly widened, and more preferable choices are provided for infrared light-transmitting plastics adopted by infrared communication, infrared camera shooting, infrared night vision, infrared navigation, infrared welding and infrared heat energy adjusting equipment.
Disclosure of Invention
The invention aims to provide an infrared light-transmitting polyamide composite material which has higher infrared light transmittance and can cut off visible light and ultraviolet rays under the condition of ensuring better processing performance.
The invention also provides a preparation method of the infrared light-transmitting polyamide composite material and application of the infrared light-transmitting polyamide composite material in injection molding products, in particular to application in infrared photographic equipment or infrared communication equipment.
According to a first aspect of the invention, a polyamide composite material comprises, in weight percent, polyamide, a visible light absorber, an ultraviolet absorber, and an optical anti-reflection agent; wherein the weight percentage of the visible light absorber and the ultraviolet absorber in the raw materials is 0.1-1.0 percent respectively; the weight percentage of the optical anti-reflection agent in the raw materials is 1-5%, the optical anti-reflection agent comprises metal chloride and polyhydroxy compound, and the polyhydroxy compound comprises one or more of pentaerythritol, dipentaerythritol and polypentaerythritol.
In a preferred embodiment, the chloride is selected from one or more of calcium chloride, lithium chloride, aluminum chloride and lanthanum chloride.
The weight percentage of the optical anti-reflection agent is any value between 1 and 5 percent; for example, the weight percent of the optical antireflective agent may be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.7%, 1.8%, 1.9%, 2.0%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%. In a preferred embodiment, the weight percentage of the optical anti-reflection agent is 1.2-3.6%. More preferably, the weight percentage of the optical anti-reflection agent is 1.5-3%.
In a preferred embodiment, the ratio of the metal chloride to the polyhydroxy compound is 1:0.3-0.5.
In a preferred embodiment, the visible light absorber comprises nigrosine.
In a preferred embodiment, the weight percentage of the visible light absorber in the raw material is 0.1-1.0%. For example, the weight percent of the visible light absorber is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1.0%. More preferably, the weight percentage of the visible light absorber in the raw materials is 0.1-0.5%; further 0.1 to 0.3%.
In a preferred embodiment, the weight percentage of the ultraviolet absorber in the raw materials is 0.1-1.0%. For example, the weight percent of the ultraviolet absorber is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1.0%. More preferably, the weight percentage of the ultraviolet absorber in the raw materials is 0.1-0.5%; further 0.1 to 0.3%.
In a preferred embodiment, the ultraviolet light absorber is selected from one or more combinations of 2- (2 ' -hydroxy-5 ' -methylphenyl) benzotriazole (ultraviolet light absorber UV-P), 2, 4-dihydroxybenzophenone (ultraviolet light absorber UV-0 (BP-1)), 2-hydroxy-4-methoxybenzophenone (ultraviolet light absorber UV-9), 2-hydroxy-4-N-octoxybenzophenone (ultraviolet light absorber UV-531), 2- (2 ' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole (ultraviolet light absorber UV-327), isooctyl 2-cyano-3, 3-diphenylacrylate (octocrylene, N-539), hexamethylphosphoric triamide (ultraviolet light inhibitor, light stabilizer HPT), 2- (2-hydroxy-3 ',5' -dicumylphenyl) -benzotriazole (ultraviolet light absorber UV-234).
In a preferred embodiment, the feedstock further comprises an ultraviolet absorbing synergist. In a preferred embodiment, the weight percentage of the ultraviolet absorption synergist in the raw materials is 0.05-0.5%; for example, it may be 0.05%, 0.08%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.4% or 0.5%. More preferably, the weight percentage of the ultraviolet absorption synergist in the raw materials is 0.1-0.3%.
In a preferred embodiment of the present invention, the ultraviolet absorption synergist is selected from 4-benzoyloxy-2, 6-tetramethylpiperidine (light stabilizer 744), tris (1, 2, 6-pentamethylpiperidyl) phosphite (light stabilizer GW-540) poly [ [6- [ (1, 3-tetramethylbutyl) amino ] -S-triazine-2, 4-diyl ] [ 2, 6-tetramethyl-4-piperidinyl) imino ] ] hexamethylene [ (2, 6-tetramethyl-4-piperidinyl) imino ] (light stabilizer 944) and bis (2, 6-tetramethyl-4-piperidinyl) sebacate (light stabilizer 770).
In a preferred embodiment, the feedstock further comprises an acid binding agent. More preferably, the weight percentage of the acid binding agent is 0.1-1%; for example, it may be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1.0%. Further, the weight percentage of the acid binding agent is 0.3-0.8%.
More preferably, the acid binding agent is selected from one or more of calcium stearate, sodium stearate, barium stearate or zinc stearate.
In a preferred embodiment, the feedstock does not include a lubricant and/or a nucleating agent.
In a preferred embodiment, the polyamide is present in the starting material in an amount greater than 93% by weight.
In a preferred embodiment, the polyamide is selected from one of polyamide 6 or its copolymers, polyamide 66, polyamide 56, polyamide 610, polyamide 612.
According to a second aspect of the present invention, a method for producing the polyamide composite material comprises: the raw materials are weighed according to the proportion, evenly mixed and extruded for molding, and the polyamide composite material particles are prepared.
According to a third aspect of the invention, the use of a polyamide composite material as described in injection molded articles.
In a preferred embodiment, the injection molded article comprises an infrared camera or an accessory for an infrared communication device, or an infrared receiving window.
According to a further aspect of the invention, the use of the polyamide composite material in a sheet. The polyamide composite material is extruded into a sheet by an extruder.
In a preferred embodiment, the thickness of the sheet is 0.2-0.6 mm; more preferably 0.4.+ -. 0.1mm.
The mechanism of the invention is as follows: if only metal chloride is used, the metal ion and the amide group are bonded through coordination bond, the bond energy is between covalent bond and hydrogen bond, and higher energy is required to be given to break the coordination bond than hydrogen bond, therefore, when only metal chloride is used to improve the light transmittance of polyamide, the movement of polyamide chain segment is limited due to a large number of covalent bonds during melt processing, the coordination bond density is increased with the increase of the chloride consumption, and the fluidity of polyamide is reduced with the increase of the chloride consumption. The metal chloride and polyhydroxy small molecular compound are compounded, partial hydrogen bonds replace coordination bonds, the hydrogen bonds are more easily damaged during melt processing, and the polyamide chain segments with partial restricted movement are released, and meanwhile, the polyhydroxy compound can also act as an internal lubricant, so that the purpose of improving the flowability of the polymer is realized.
On the other hand, only metal chloride is used as an anti-reflection agent, the polyamide chain segments are more easily restricted from movement, the stress relaxation is slowed down, the internal stress of the product is relatively large during injection molding, and the impact resistance of the material, particularly the dry impact resistance is reduced; the polyhydroxy small molecular compound is introduced, and the polyhydroxy small molecular compound has larger degree of freedom, so that dynamic balance is easy to achieve in a shorter time in the stress relaxation process, thereby being beneficial to improving the shock resistance of the material.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
According to the polyamide composite material, the metal chloride, the polyhydroxy compound selected from pentaerythritol, dipentaerythritol and polypentaerythritol and the ultraviolet absorber are compounded, and the metal chloride, the polyhydroxy compound selected from pentaerythritol, dipentaerythritol and polypentaerythritol and the ultraviolet absorber are mutually coordinated, so that the composite material has high infrared transmittance, can block visible light and ultraviolet, simultaneously keeps the excellent processing performance of polyamide, and the obtained polyamide composite material is not brittle, has good impact resistance, good fluidity and good toughness and processing performance.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a DSC of the polyamide composite of example 1.
FIG. 2 is a DSC of the polyamide composite of example 3.
FIG. 3 is a DSC of the polyamide composite of example 5.
Fig. 4 is a DSC diagram of the polyamide composite material of comparative example 1.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The inventor finds that: the addition of the metal chloride to the polyamide can improve the infrared permeability of the polyamide, however, the addition of the metal chloride also leads to the deterioration of the fluidity of the polyamide material, and the obtained polyamide composite material is brittle and has poor impact resistance. The material is brittle and easy to crack in a dry state. Based on the above, the inventors further studied and found that when the metal chloride and the polyhydroxy compound selected from pentaerythritol, dipentaerythritol and polypentaerythritol are compounded for use, the infrared transmittance of the polyamide material can be improved, and the defects of brittleness and poor processability of the material can be overcome. The polyamide composite material of the application: the metal chloride and the polyhydroxy compound selected from pentaerythritol, dipentaerythritol and polypentaerythritol are added into the polyamide in a compounding way, and then the visible light absorber and the ultraviolet absorber are matched in a synergistic way, so that the hydrogen bond of the polyamide is broken by the pentaerythritol, the dipentaerythritol and the polypentaerythritol at high temperature to increase the fluidity of the material, the material stably exists at low temperature to play a role similar to that of a nucleating agent, and the material is finer in crystallization and better in toughness; the polyamide composite material has higher infrared light transmission capability, can block visible light and ultraviolet light, is not brittle, and has better toughness and processability.
The application relates to a polyamide composite material capable of transmitting infrared light, which comprises the following raw materials in percentage by weight:
90-98% of polyamide;
0.1-1.0% of visible light absorber;
0.1-1.0% of ultraviolet absorber;
0.5-5% of a light anti-reflection agent;
0.05-0.5% of ultraviolet absorption synergist;
the other is processing aid.
Wherein the polyamide may be selected from one or more of polyamide 6 or its copolymers, polyamide 66, polyamide 56, polyamide 610, polyamide 612. The visible light absorber includes nigrosine. The ultraviolet absorbent is selected from one or more of 2- (2 ' -hydroxy-5 ' -methylphenyl) benzotriazole, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorinated benzotriazole, isooctyl 2-cyano-3, 3-diphenylacrylate, hexamethylphosphoric triamide and 2- (2-hydroxy-3 ',5' -dicumylphenyl) -benzotriazole. 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole (ultraviolet absorber UV-P) capable of absorbing ultraviolet light of 270 to 380nm wavelength; 2, 4-dihydroxybenzophenone (ultraviolet absorber UV-O) has a maximum absorption wavelength range of 280-340 nm; 2-hydroxy-4-methoxybenzophenone (ultraviolet absorber UV-9) with a maximum absorption wavelength range of 280-340 nm; 2-hydroxy-4-n-octoxybenzophenone (ultraviolet absorber UV-531) strongly absorbs ultraviolet rays with the wavelength of 240-340 nm;2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole (ultraviolet absorber UVP-327), which strongly absorbs ultraviolet rays with the wavelength of 270-380 nm; isooctyl 2-cyano-3, 3-diphenylacrylate with a maximum absorption wavelength range of 290-400 nm; hexamethylphosphoric triamide (light stabilizer HPT) can effectively absorb ultraviolet light with the wavelength of 270-380 nanometers. The ultraviolet absorption synergist is selected from 4-benzoyloxy-2, 6-tetramethylpiperidine, tris (1, 2, 6-pentamethylpiperidyl) phosphite Poly [ [6- [ (1, 3-tetramethylbutyl) amino ] -S-triazine-2, 4-diyl ] [2, 6-tetramethyl-4-piperidinyl) imino ] ] hexamethylenej [ a combination of one or more of (2, 6-tetramethyl-4-piperidinyl) imino ] and bis (2, 6-tetramethyl-4-piperidinyl) sebacate. Among them, 4-benzoyloxy-2, 6-tetramethylpiperidine (light stabilizer 744) has excellent synergistic effect when used in combination with an antioxidant and an ultraviolet absorber.
Optical antireflective agents include metal chlorides and polyhydroxy compounds; the metal chloride is selected from one or more of calcium chloride, lithium chloride, aluminum chloride and lanthanum chloride; the polyhydroxy compound comprises a combination of one or more of pentaerythritol, dipentaerythritol, and dipentaerythritol.
The processing aid comprises an acid binding agent, wherein the weight percentage of the acid binding agent is 0.1-1%, and the acid binding agent is one or a combination of a plurality of calcium stearate, sodium stearate, barium stearate or zinc stearate.
The processing aid further comprises one or more of a plasticizer, a lubricant, a mold release agent, a nucleating agent, an antioxidant, and a filler.
In some preferred embodiments, the processing aid does not include a lubricant, and the polyhydroxy compound acts as a lubricant. The formula is specifically as follows: 90-98% of polyamide; 0.1-1.0% of visible light absorber; 0.1-1.0% of ultraviolet absorber; 0.5-5% of a light anti-reflection agent; 0.05-0.5% of ultraviolet absorption synergist; the others are processing aids, which do not include lubricants. Further, the processing aid includes an acid-binding agent; the processing aid also comprises one or more of a nucleating agent, a plasticizer, a mold release agent, an antioxidant and a filler.
In other preferred embodiments, the processing aid does not include a nucleating agent, and the polyhydroxy compound acts as a nucleating agent. The formula is specifically as follows: 90-98% of polyamide; 0.1-1.0% of visible light absorber; 0.1-1.0% of ultraviolet absorber; 0.5-5% of a light anti-reflection agent; 0.05-0.5% of ultraviolet absorption synergist; the others are processing aids that do not include a nucleating agent. Further, the processing aid includes an acid-binding agent; the processing aid also comprises one or more of a lubricant, a plasticizer, a mold release agent, an antioxidant and a filler.
In still other preferred embodiments, the processing aid does not include a lubricant and a nucleating agent, and the polyhydroxy compound functions as both a lubricant and a nucleating agent. The formula is specifically as follows: 90-98% of polyamide; 0.1-1.0% of visible light absorber; 0.1-1.0% of ultraviolet absorber; 0.5-5% of a light anti-reflection agent; 0.05-0.5% of ultraviolet absorption synergist; the others are processing aids that do not include lubricants and nucleating agents. Further, the processing aid includes an acid-binding agent; the processing aid also comprises one or more of a plasticizer, a mold release agent, an antioxidant and a filler.
The components are uniformly mixed according to the proportion, and the mixture is granulated by a double-screw extruder. The temperature of the twin-screw extruder is 120 ℃, 180 ℃, 220 ℃ from the first zone to the eleventh zone 240 ℃, 240 DEG C240 ℃, 235 ℃, the die temperature is 235 ℃; the main screw speed was 300 rpm. In use, the article can be injection molded, with the test sample injection molding temperature being 235 ℃, 255 ℃ and 255 ℃ from the first zone to the fourth zone at a time.
The polyamide composite material can be formed into a sheet by an extruder, and the thickness of the sheet is 0.2-0.6 mm; more preferably 0.4.+ -. 0.1mm.
As sheet material, the formulation of the polyamide composite material may also preferably be as follows:
90-98% of polyamide;
0.1-1.5% of visible light absorber;
0.1-1.5% of ultraviolet absorber;
0.5-5% of a light anti-reflection agent;
0.05-0.5% of ultraviolet absorption synergist;
the other is processing aid.
The selection of specific components is the same as above.
The raw materials used in the following examples and comparative examples are shown in Table 1.
The performance test method comprises the following steps:
tensile test method testing according to ASTM-D638
The bending test is performed according to ASTM-D790.
Notched impact is tested according to ASTM-D256.
Transmittance: testing was performed according to ASTM D1003.
Melt index was measured according to ASTM D1238 at 260 ︒ C under a load of 2.16kg.
The DSC (thermal analysis) crystallization temperature test method comprises the following steps: the sample is heated from room temperature to 260 ℃ at a rate of 10 ℃ per minute, and after being kept at the constant temperature for 2 minutes, the sample is cooled to the room temperature at a rate of 10 ℃ per minute, and the peak value of the cooling crystallization peak is defined as the crystallization temperature.
Examples 1 to 5 and comparative examples 1 to 3
The raw materials were weighed according to table 2, uniformly mixed, extruded with a screw extruder, and pelletized to obtain polyamide composite materials of examples 1 to 5. The results of the performance tests are shown in Table 2 below. Among them, the DSC charts of examples 1, 3, 5 and comparative example 1 are shown in sequence in fig. 1 to 4, and the crystallization temperatures are shown in the following table 2. The materials of comparative examples 1 to 3 were fabricated into color plates having a thickness of 1mm, and transmittance for light rays of different wavelength bands was shown in table 2 below.
As is clear from Table 2, as the addition amount of the above-mentioned polyhydroxy compound increases, the crystallization temperature of the polyamide composite material decreases, the MFR value increases, and the above-mentioned polyhydroxy compound contributes to improvement of the melt flowability of the polyamide composite material. The crystallization temperature of the pure polyamide material without pentaerythritol addition is significantly lower than in examples 1, 3 and 5, and the mfr value is also lower than in examples 1 to 5.
From the DSC thermograms of FIGS. 1 to 4, it is clear that the above-mentioned polyhydroxy compounds (e.g., pentaerythritol) can also function as nucleating agents at the same time. Thus, in the formulation of the above examples, the polyhydroxy compound (e.g., pentaerythritol) is present as both a lubricant and a nucleating agent. In addition, the applicant also carries out DSC thermal analysis on the composite material compounded by PA6 and a plurality of nucleating agents, and the results are compared as follows:
pa6+ pentaerythritol: the crystallization peak temperature is 191.3 ℃, 190.4 ℃ and 189.6 ℃ in sequence, and the addition amount of pentaerythritol is 0.2 wt%, 0.6 wt% and 1.0 wt% in sequence;
PA6+0.2 wt% P22: the crystallization peak temperature is 193.0 ℃;
pa6+0.3 wt% MMT: the crystallization peak temperature is 192.4 ℃;
PA6+0.15 wt% MMT +0.05 wt% P22: the crystallization peak temperature was 191.6 ℃.
The amount of the above-mentioned polyhydroxy compound (e.g., pentaerythritol) is preferably 0.1 to 0.3 wt% for the nucleation effect of the polyamide, and if the amount is increased, the crystallization peak temperature is shifted in the low temperature direction, the crystallization peak is widened, and the tailing phenomenon becomes serious.
Examples 6 to 16
The raw materials were weighed according to Table 3, uniformly mixed, extruded with a screw extruder, and pelletized to obtain polyamide composites of examples 6 to 16. The results of the performance tests are shown in Table 3 below. The composites of examples 6 to 16 were fabricated into color plaques having a thickness of 1mm, see table 3 below, for transmittance of light in different wavelength bands.
Comparative examples 4 to 5
The raw materials were weighed according to Table 4, uniformly mixed, extruded with a screw extruder, and pelletized to obtain polyamide composites of comparative examples 4 and 5. The results of the performance tests are shown in Table 4 below. The composites of comparative examples 4 and 5 were fabricated into color plaques having a thickness of 1mm, see Table 4 below for light transmittance at different wavebands.
In tables 3 and 4, glyceryl triacetate was used as a plasticizer and an internal lubricant, and if the amount was too large, there was a risk of precipitation, thereby contaminating the adjacent optical element. EBS is ethylene stearate as an internal and external lubricant. CaSt 2 is calcium stearate and has the efficacy of an external lubricant, a mold release agent and an acid binding agent. P22 is nylon 22, which is used as an organic nucleating agent; MMT is modified montmorillonite as inorganic nucleating agent; the two nucleating agents can be compounded to adjust the proportion of different types of unit cells so as to balance the strength or rigidity and toughness. AO1098 is an antioxidant 1098. The pigment carbon black is used as a filler, and can also endow black to block light transmission. TiO 2 is titanium white, baSO 4 is barium sulfate, and is used for blocking light transmission.
As can be seen from a combination of tables 3 and 4, the polyamide composites of examples 6 to 16 have higher infrared light transmittance and/or higher MFR values than the comparative examples. Among them, the composite materials of examples 10 to 13, 15 and 16 also had excellent barrier properties against both ultraviolet light and visible light, while still maintaining an infrared light transmittance of more than 30%, and a higher MFR value, which were superior to those of comparative examples 4 and 5.
As used in this specification and in the claims, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. If a definition used herein contradicts or is inconsistent with a definition set forth in other publications, the definition used herein should prevail.
The above-described embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to be preferred embodiments for those skilled in the art to understand the present invention and implement the same according to the present invention, not to limit the scope of the present invention. All equivalent changes or modifications made according to the principles of the present invention should be construed to be included within the scope of the present invention.
Claims (13)
1. The polyamide composite material is characterized by comprising the following raw materials in percentage by weight, namely polyamide, a visible light absorber, an ultraviolet absorber and a light anti-reflection agent; wherein the weight percentage of the visible light absorber and the ultraviolet absorber in the raw materials is 0.1-1.0 percent respectively; the weight percentage of the optical anti-reflection agent in the raw materials is 0.5-5%, the optical anti-reflection agent comprises metal chloride and polyhydroxy compound, and the polyhydroxy compound comprises one or more of pentaerythritol, dipentaerythritol and polypentaerythritol.
2. The polyamide composite material of claim 1 wherein said metal chloride is selected from the group consisting of one or more of calcium chloride, lithium chloride, aluminum chloride, and lanthanum chloride.
3. The polyamide composite material according to claim 1, wherein the weight percentage of the optical antireflective agent is 1.2-3.6%, and wherein the ratio of the metal chloride to the polyhydroxy compound is 1:0.3-0.5.
4. The polyamide composite material of claim 1 wherein said visible light absorber comprises nigrosine.
5. The polyamide composite material of claim 1 wherein said ultraviolet absorber is selected from the group consisting of one or more of 2- (2 ' -hydroxy-5 ' -methylphenyl) benzotriazole, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorinated benzotriazole, isooctyl 2-cyano-3, 3-diphenylacrylate, hexamethylphosphoric triamide, and 2- (2-hydroxy-3 ',5' -dicumylphenyl) -benzotriazole.
6. The polyamide composite material according to claim 1, wherein the raw material further comprises an ultraviolet absorption synergist, and the weight percentage of the ultraviolet absorption synergist in the raw material is 0.05-0.5%.
7. The polyamide composite material as claimed in claim 6, wherein, the ultraviolet absorption synergist is selected from 4-benzoyloxy-2, 6-tetramethylpiperidine, tris (1, 2, 6-pentamethylpiperidyl) phosphite ester Poly [ [6- [ (1, 3-tetramethylbutyl) amino ] -S-triazine-2, 4-diyl ] [2, 6-tetramethyl-4-piperidinyl) imino ] ] hexamethylenej [ a combination of one or more of (2, 6-tetramethyl-4-piperidinyl) imino ] and bis (2, 6-tetramethyl-4-piperidinyl) sebacate.
8. The polyamide composite material according to claim 1, wherein the raw material further comprises an acid-binding agent, the weight percentage of the acid-binding agent is 0.1-1%, and the acid-binding agent is one or a combination of more of calcium stearate, sodium stearate, barium stearate or zinc stearate.
9. The polyamide composite material according to claim 1, wherein the polyamide is present in the raw material in an amount of more than 93% by weight.
10. The polyamide composite material according to claim 1, wherein the polyamide is selected from one of polyamide 6 or its copolymers, polyamide 66, polyamide 56, polyamide 610, polyamide 612.
11. A process for the preparation of a polyamide composite material according to any one of claims 1 to 10, characterized in that it comprises: the raw materials are weighed according to the proportion, evenly mixed and extruded for molding, and the polyamide composite material particles are prepared.
12. Use of a polyamide composite material according to any one of claims 1 to 10 in injection molded articles.
13. The use according to claim 12, wherein the injection molded article comprises an infrared photographic equipment or an accessory of an infrared communication device, or an infrared receiving window.
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| CN119350833A (en) * | 2024-12-25 | 2025-01-24 | 张家港绿洲新材料科技有限公司 | A nucleating agent for improving the crystallization behavior of polyamide and its application |
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| CN118359920B (en) | 2024-10-01 |
| CN119391173A (en) | 2025-02-07 |
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