49results about How to "Reduce yellowing" patented technology

The invention relates to an anti-yellowing automobile composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The yellow-resistant automobile composite film is prepared from the following components in parts by weight: 60 to 70 parts of PVC (Polyvinyl Chloride) master batch, 10 to 20 parts of TPU (Thermoplastic Polyurethane) master batch, 1 to 2 parts of plasticizer, 0.5 to 0.8 part of flatting agent, 0.1 to 2 parts of yellowing-resistant modifier and 0.1 to 2 parts of modified flame retardant, sym-triazine cyanuric chloride and a benzotriazole intermediate in the anti-yellowing modifier absorb ultraviolet rays and reduce yellowing of the ultraviolet rays on the composite material, and maleimide groups, maleic anhydride and isocyanurate rings for increasing the crosslinking density cooperate with one another, so that the heat resistance of the material is improved, and the yellowing is reduced; phosphorus and nitrogen main chains of phosphonitrilic chloride trimer in the modified flame retardant have a conjugation effect, so that a protective film is formed, oxygen is isolated, and the phosphonitrilic chloride trimer and nitrogen are synergistically flame-retardant; the anti-yellowing automobile composite film prepared by the invention not only has excellent ultraviolet absorption performance, heat resistance and anti-yellowing effects, but also has a good flame retardant effect.

The invention discloses a high-water-resistance photovoltaic module non-glass front plate and a preparation method thereof. The non-glass front plate comprises a transparent fluorine film, a cut-off type transparent flame-retardant adhesive film and a transparent water-blocking composite plate; the transparent water-blocking composite board comprises a transparent transition layer, a transparent PET film, a water-blocking film and a transparent priming coat which are compounded in sequence; the cut-off type transparent flame-retardant adhesive film contains an ultraviolet light absorber; a transparent transition layer in the transparent water-blocking composite board is compounded with the cut-off type transparent flame-retardant adhesive film; the transparent bottom coating is provided with protruding points protruding out of the surface of the coating. The high-water-resistance photovoltaic module non-glass front plate has the advantages of high weather resistance, high light transmittance, light weight, water resistance and flame retardance, is suitable for distributed power generation scenes, and can effectively overcome the defects that a glass back plate is heavy in weight, not easy to install and high in infrastructure requirement.

The invention relates to the technical field of biology, in particular to application of coding sites of soybean PRR5a and PRR5b genes in the aspect of regulating and controlling salt tolerance and application of a mutant material generated by the coding sites in the aspect of regulating and controlling the salt tolerance of soybeans. According to the invention, an effective target for editing soybean PRR5a and PRR5b genes is subjected to double-strand breakage under mediation of endonuclease Cas9, so that different allele mutants of PRR5a and PRR5b are obtained. By knocking out the PRR5a and PRR5b genes, a new strategy is provided for enhancing the salt tolerance of the soybeans, reliable means and materials are also provided for cultivating new varieties of the soybeans and improving the salt tolerance, and the method plays an important role in research and production of crops.

The LED ceiling lamp comprises a base assembly and a lampshade assembly, the base assembly comprises a base and a light source module installed in the base, the lampshade assembly comprises a face ring, a light-transmitting plate and a reflecting cover, the light-transmitting plate and the reflecting cover are installed in the face ring, a clamping groove is formed in the outer side wall of the base, and a buckle is arranged on the inner side wall of the face ring. The lampshade assembly is installed on the base through clamping fit of the buckles on the face ring and the clamping grooves in the base. According to the LED lamp, the lampshade assembly is arranged, the light-transmitting plate and the reflecting cover are arranged in the face ring, the buckles are arranged on the inner side wall of the face ring, meanwhile, the clamping grooves are formed in the outer side wall of the base, the face ring is arranged on the base in a sleeved mode, the face ring is screwed on the base through matching of the buckles and the clamping grooves, and at least part of the base is installed in the face ring; the height of the ceiling lamp is reduced, the packaging and transportation cost is reduced, and the light effect of the whole lamp is improved.

The invention belongs to the field of polymer compositions, and particularly relates to an anti-yellowing polyphenyl ether composite material as well as a product and application thereof. The invention provides a yellowing-resistant polyphenyl ether composite material, which is prepared from the following components in parts by weight: 30 to 70 parts of polyphenyl ether resin, 15 to 40 parts of polystyrene, 0 to 15 parts of flame retardant, 0 to 30 parts of reinforcing filler, 0 to 10 parts of compatilizer, 0.1 to 1 part of benzoin, 0.01 to 0.3 part of DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) and 0 to 5 parts of other auxiliaries. The application accidentally finds that 0.01-0.3 part of DOPO with extremely low parts is introduced into the benzoin processing yellowing resistant system of polyphenyl ether, and through the synergistic effect of benzoin and DOPO components and contents, the processing yellowing resistant performance of polyphenyl ether is further improved in the processing process of polyphenyl ether, and the processing yellowing resistant performance of the polyphenyl ether is further improved. And the yellowing resistance in a hot oxygen environment, a natural environment and a humid and hot environment is also greatly improved.

The application discloses an anti-ultraviolet aging polycarbonate modified material and application thereof, and belongs to the technical field of polymer material modification. The material comprises synergistically modified polycarbonate, an organic small-molecule functional regulator, an antioxidant, a light stabilizer, a lubricating dispersant and an inorganic filler, wherein the synergistically modified polycarbonate is constructed into a multiple synergistic network by introducing a borate dynamic covalent structure, a Schiff base structure and a rare earth coordination structure, and the organic small-molecule functional regulator is p-hydroxybenzophenone. The preparation method comprises preparation of the synergistically modified polycarbonate and a subsequent melt blending and extrusion process. Through the technical scheme, the synergistic effect of ultraviolet absorption, energy transfer and free radical inhibition is realized, the yellowing degree of the material is significantly reduced, the mechanical property retention rate and the optical stability are improved, and the material is suitable for the fields of automobile transparent parts, outdoor optical materials and electronic and electrical shell.

The invention relates to the technical field of fabrics, in particular to a long-term preservation post-treatment method for silk brocade, which comprises the following steps: step 1, preparation of a finishing agent: mixing a Chinese waxgourd peel extract, hydrogen peroxide, an ultraviolet light absorber, a nano ultraviolet finishing agent and deionized water to prepare a finishing liquid; step 2, pretreatment of the brocade fabric: performing plasma treatment on the brocade fabric; step 3, finishing the brocade fabric; the brocade fabric is put into the finishing liquid for two times of dipping and two times of rolling, the antibacterial and anti-aging brocade fabric is obtained through hot drying, the Chinese waxgourd peel extract is cooperatively matched with hydrogen peroxide, an ultraviolet light absorber and an ultraviolet finishing agent, the anti-ultraviolet and antibacterial properties of the fabric are further optimized, the service life of the silk brocade fabric is prolonged, and the silk brocade fabric is worthy of popularization and application. The technical effect that the beauty of the silk brocade fabric is kept for a long time is achieved.

The invention relates to the field of high-adhesion finishing paint, in particular to PU (polyurethane) matte white finishing paint applied to a melamine board and a preparation method of the PU matte white finishing paint. The PU matte white finish applied to the melamine board comprises a main agent, a curing agent and a diluent, the mass ratio of the main agent to the curing agent to the diluent is 1: (0.1-0.3): (0.5-0.8); the main agent is prepared from acrylic resin, a dispersing agent, a defoaming agent, pigment, filler, matting powder, an auxiliary agent, a flatting agent, a viscosity reducer, corn fiber, lotus leaf powder, coconut fiber and a coupling agent. Compared with the prior art, the adhesive force of the PU matte white finish on a melamine board can be enhanced, the PU matte white finish can be well attached under the condition that polishing is not in place or even polishing is not conducted, and therefore a good surface effect is provided, and the PU matte white finish has high yellowing resistance and high toughness.

The invention relates to the technical field of building waterproof composite materials, in particular to an organic silicon modified resin building waterproof composite material and a preparation method thereof. Comprising a waterproof roll and a waterproof coating arranged on the surface of the waterproof roll, the waterproof coating is prepared from the following components in parts by weight: 20 to 32 parts of silane modified polyether, 15 to 30 parts of organic silicon modified resin, 5 to 10 parts of polysaccharide-based composite polylactic acid, 8 to 12 parts of plasticizer, 1 to 3 parts of curing agent, 0.5 to 2 parts of titanium dioxide and 0.5 to 3 parts of water removal agent. An organic silicon structure in the prepared waterproof composite material has the characteristic of low surface energy, so that the surface of a coating presents strong hydrophobicity, and liquid water permeation is effectively blocked; the waterproof coating can be matched with a compact cross-linked network structure to form a continuous and seamless waterproof film, realizes high hydrostatic pressure resistance and low water absorption, and is suitable for key waterproof parts such as roofs, basements and toilets.

The application discloses a kind of high-performance outdoor full package imitation wood composite board and preparation method thereof, relate to polyurethane composite board technical field, the full package imitation wood composite board includes base board, and the polyurethane material of setting in the lower surface and the four around of base board, and the resin material of setting in upper surface.Its preparation method includes the following steps: pouring polyurethane material in the silica gel mould after surface treatment, place base board, mould pressing, make the polyurethane material with wood texture around and lower surface of base board composite, obtain intermediate product A;Resin material is rolled on the upper surface of intermediate product A, and is dried, to obtain full package imitation wood composite board;The silica gel mould after surface treatment is prepared by transferring real solid wood board texture.

The invention discloses a cotton fabric crease-resistant finishing method for constructing a simulated semi-interpenetrating polymerization network based on in-situ polymerization, isopentenol polyoxyethylene ether macromonomer copolymerization is introduced in the method, and on the basis of in-situ polymerization, maleic anhydride and acrylic acid are used for jointly realizing the crease-resistant finishing effect of polycarboxylic acid; by means of the structural characteristics of the isopentenol polyoxyethylene ether macromonomer, an imitated semi-interpenetrating polymerization network structure is constructed in the cotton fabric, and anti-wrinkle finishing of the cotton fabric is achieved. Under the optimal process conditions, the optimal anti-wrinkle finishing effect is obtained, the wrinkle recovery angle WRA is 252.2 degrees, and the whiteness is 73.6. The obtained wrinkle recovery angle WAR of the original cloth sample is 141.5 degrees, and the whiteness is 80.7. The wrinkle recovery angle is obviously increased, the anti-wrinkle effect is obvious, the whiteness maintaining effect is good, and yellowing is small. The method is easy to operate, raw materials are easy to obtain, enterprise cost can be saved, and environmental protection and industrial production are facilitated.

The application provides a self-repairing silicone resin and a preparation method thereof, OCA optical glue containing the self-repairing silicone resin and application of the self-repairing silicone resin. The self-repairing silicone resin contains a disulfide bond and a mercapto group in a molecular structure. The content of the disulfide bond in the self-repairing silicone resin is greater than 0.6 mmol / g. The self-repairing silicone resin is used for preparing OCA optical glue. While ensuring high light transmittance, low yellowing and good mechanical properties of the OCA optical glue, the self-repairing silicone resin can improve the initial adhesion of the OCA optical glue, and can also endow the OCA optical glue with a self-repairing function and improve the repair efficiency.

The invention belongs to the technical field of lampshade materials of automobile atmosphere lamps, and discloses a chemical-resistant photodiffusion polycarbonate material for a CL process and a preparation method of the chemical-resistant photodiffusion polycarbonate material. Comprising the following raw materials in parts by weight: 75-95 parts of polycarbonate, 30-50 parts of bio-based polycarbonate, 1-5 parts of an acrylate and polycarbonate copolymer, 0.1-1 part of an ester exchange inhibitor, 0.1-0.5 part of an antioxidant, 0.1-0.5 part of a lubricant, 0.5-1.5 parts of a light diffusion agent, 1-3 parts of nano silicon dioxide and 0.5-2 parts of benzophenone. By adding the acrylate and polycarbonate copolymer, the photodiffusion polycarbonate material can effectively resist corrosion of chemical solvents, so that the anti-cracking performance of the material in a chemical environment is enhanced, meanwhile, bio-based polycarbonate has relatively good chemical stability in a molecular structure, and the photodiffusion performance of the material is improved. And the chemical resistance of the light diffusion polycarbonate material is further enhanced through the addition of the light diffusion polycarbonate material, so that the material is slightly influenced when being processed by a CL process, and the product quality is improved.

The invention relates to the technical field of high polymer materials, and particularly discloses anti-yellowing polyester resin for an MDF plate and a preparation method of the anti-yellowing polyester resin. An antioxidant unit and a formaldehyde reactive unit are simultaneously bonded on a molecular chain of the polyester resin through covalent bonds, and the two functional units are connected to a polyester main chain through flexible chain segments. The preparation method comprises the following steps: firstly, synthesizing a difunctional linking agent of which one end contains an antioxidant group, the other end contains a formaldehyde reactive group and the middle is connected by a flexible chain segment; and carrying out melt polycondensation reaction on the coupling agent serving as an end-capping reagent or a comonomer, polyhydric alcohol and polybasic acid to obtain the target resin. The problems of migration, loss and failure caused by traditional physical addition of small-molecule auxiliaries are fundamentally solved, so that when the obtained polyester resin is used for an MDF plate facing coating, lasting and efficient hot-pressing yellowing resistance and weather yellowing resistance can be provided, the free formaldehyde release amount of a plate can be continuously captured and reduced, and the service life of the plate is prolonged. The decorative property and the environment-friendly property are both improved.

The invention provides nano-imprinting glue with ultraviolet aging resistance and high refractive index and a preparation method of the nano-imprinting glue, and the glue comprises the following components in percentage by mass: 45-95% of inorganic composite nanoparticles containing titanium oxide, 1-45% of a light-cured resin monomer, 0.5-15% of a photoinitiator, 0.05-15% of a UV absorbent and 0.05-10% of a leveling aid. The inorganic composite nanoparticles containing titanium oxide are matched with the light-cured resin monomer, so that on one hand, the glue has high refractive index, and on the other hand, the content of titanium oxide in the glue is reduced, thereby reducing the number of free radicals generated by titanium oxide in the glue under the photocatalysis of outdoor ultraviolet light, and improving the light-cured property of the glue. Therefore, the yellowing and aging speed of a resin monomer material in the glue is slowed down. The UV absorbent of the components is further matched with the inorganic composite nanoparticles containing the titanium oxide, and the UV absorbent absorbs outdoor ultraviolet rays irradiating the titanium oxide in the glue, so that free radicals, which cause yellowing and aging of resin monomers, of the titanium oxide are prevented from being generated due to ultraviolet irradiation.

The application belongs to the technical field of thermoplastic elastomer modification, and discloses a silane coupling agent modified thermoplastic elastomer and a preparation method thereof, and aims to solve the technical defects of the existing thermoplastic elastomer, such as uncoordinated strength and toughness, poor temperature change resistance, insufficient ultraviolet stability, and poor comprehensive performance coordination. The modified thermoplastic elastomer is prepared by compounding a thermoplastic elastomer base material, a silane coupling agent modification liquid, a boron nitride-kaolin combined agent and other auxiliary agents according to specific weight parts. The preparation process of the application is simple and controllable, the obtained modified thermoplastic elastomer has balanced strength and toughness, a wide temperature change resistance range, excellent ultraviolet stability and outstanding comprehensive performance.

The invention discloses a chemical stripping solution as well as a preparation method and application thereof. The chemical stripping liquid is prepared from the following components in parts by weight: 39 to 51 parts of ether-based ionic liquid, 1 to 21 parts of carboxyl ionic liquid and 39 to 51 parts of pyrrolidine ionic liquid. When the chemical deplating solution is used for deplating metal on the surface of plastic through an electrolytic method, the excellent deplating rate is achieved, and recycled plastic still has good impact resistance and low yellowing.

The utility model discloses a high-light-transmission plastic packaging film which has excellent gloss and light transmission, high weather resistance and good wear-resistant and scratch-resistant effects. Comprising a base material, a first diffusion layer, an anti-reflection layer, an anti-ultraviolet layer, an anti-oxidation layer, a damp-proof layer, a wear-resistant layer and a scratch-resistant layer are sequentially arranged on the upper surface of the base material, a second diffusion layer and a transparent adhesive layer are sequentially arranged on the lower surface of the base material, and the base material is made of a high-transparency PET sheet.

The invention belongs to the field of polyamide, and particularly relates to high-viscosity polyamide 66 resin as well as a preparation method and application thereof. The relative viscosity of the high-viscosity polyamide 66 resin is 3.0-6.5, and the amino-terminated group content is less than or equal to 50mmol / kg. The method for preparing the high-viscosity polyamide 66 resin is carried out under the positive pressure condition, the nitrogen atmosphere is adopted, and the temperature is always below the melting point of polyamide 66, so that materials are uniformly heated, and yellowing of the materials caused by air entering can be avoided. Downstream products prepared from the high-viscosity polyamide 66 resin have excellent properties such as high impact resistance, high shear resistance, high toughness and low-temperature toughness meeting use requirements.

A process for making a grafted polyolefin having improved yellowness properties, the process comprising reacting a blend of: (i) at least one polyolefin; (ii) at least one monomer; wherein the at least one monomer is selected from one or more acid compounds having the following general chemical formula (I) or formula (II): wherein in formula (I) and formula (II), R1 or R2 is H, with the proviso that neither R1 nor R2 is H; wherein at least one of R1 and R2 is an alkyl or alkenyl group having 1 to 20 carbon atoms; and wherein R1, R2, or both R1 and R2 can further comprise an ester, a heteroatom, an aryl group, or a halogen; and (iii) at least one radical initiator to form a grafted polyolefin; wherein the grafted polyolefin has lt; and the yellowness index YIE313 of the product is 30. # imgabs0 #

The invention discloses application of a furo-benzopyrone derivative in preparation of a product for reducing accumulation of advanced glycosylation end products, and belongs to the technical field of preparation of anti-saccharification products. The furo-benzopyrone derivative not only has a remarkable AGEs inhibition effect, can avoid accumulation of AGEs, but also can reduce skin yellowing caused by accumulation of AGEs, plays an anti-aging role by reducing AGEs, has no toxic effect on cells, has good safety, can meet the general requirements of anti-saccharification, and has good application prospects. The compound is used for preventing and / or treating diseases related to AGEs accumulation, such as senescence and diabetes, cardiovascular diseases, metabolic syndrome, obesity, hypertension, arteriosclerosis, neurodegenerative diseases and other degenerative diseases.

The present invention discloses a transparent display screen based on plasmon particles, comprising a horizontally arranged transparent substrate, wherein a blue light display metal particle layer, a green light display metal particle layer and a red light display metal particle layer are sequentially arranged on the upper surface of the transparent substrate. The transparent display screen of the present invention comprises a transparent substrate and a metal nanoparticle layer for realizing red, green and blue light intensity scattering, wherein the metal nanoparticles have wavelength selective strong resonance scattering characteristics, so that a clear pattern can be displayed on the screen when light near the resonance wavelength is projected on the screen. Compared with the previous preparation method based on coating and drying of a silver nanoparticle solution, the production process of the present invention has the advantages of low cost, short preparation cycle, convenient tuning of the display wavelength and the like, and has important application value.

The invention discloses an application of a MtCIPK12 gene in regulating plant resistance to low-iron stress and riboflavin synthesis, comprising: step one, obtaining a plant mutant by reducing the expression of a MtCIPK12 gene and a MtCIPK12 protein of a wild-type plant; the amino acid sequences of the MtCIPK12 gene and the MtCIPK12 protein are sequence 1 and sequence 2; step two, observing the expression and function of key enzyme genes in the riboflavin biosynthesis process of the plant mutant under iron deficiency; step three, increasing the accumulation of riboflavin in the plant mutant, and enhancing the stress resistance to low-iron stress; the MtCIPK12 gene mutant material has a stronger low-iron resistance, that is, exhibits lower leaf yellowing, higher leaf and root biomass, higher iron content, and higher riboflavin accumulation, proving that the MtCIPK12 gene mutation can improve the plant's resistance to low-iron stress and improve the plant's riboflavin content.

The present application relates to a kind of photocuring composition and its preparation method and application, the photocuring composition includes the following components: resin, active monomer and photoinitiator.The photocuring composition described in the present application has low photoinitiator mobility, good solubility of photoinitiator in monomer, low energy required when the photocuring composition is cured, high adhesion on the surface of various substrates such as plastic, metal and other difficult to adhere substrates, and the photocuring composition has low odor during curing process, low yellowing degree after curing, high stability and repeatability of the system, and excellent comprehensive performance.

The invention provides nicotinamide whitening, moisturizing and beautifying cream and a preparation method thereof, and belongs to the technical field of cosmetics. According to the nicotinamide whitening, moisturizing and beautifying cream, the nicotinamide derivative, the fermentation extract and other components are added, so that the prepared nicotinamide whitening, moisturizing and beautifying cream has better functions of whitening, moisturizing, diminishing inflammation, resisting bacteria and enhancing skin barrier, the absorption of active components by skin can be improved, the addition amount of the active components is reduced, the cost is reduced, the effect is improved, and the nicotinamide whitening, moisturizing and beautifying cream has a good application prospect. Wide application prospects are realized.

The invention discloses soybean endophyte HML5368, application of the soybean endophyte HML5368 and a plant leaf spraying agent, the soybean endophyte HML5368 is named as Bacillus cereus according to taxonomy and is preserved in China General Microbiological Culture Collection Center on September 23, 2024, and the preservation number of the soybean endophyte HML5368 is CGMCC NO: 32043. In the invention, the soybean endophyte HML5368 is found and separated by the inventor for the first time, the secreta of the soybean endophyte HML5368 serves as an effective component of the plant leaf spraying agent, the benefit of the soybean endophyte HML5368 on plant growth is reserved, the soybean endophyte HML5368 can be used for other plants except soybeans, the requirement of the endophyte on specificity is avoided, and the application prospect is wide. The endophyte has important significance in popularization and application of the endophyte in crops.

The present application discloses an ethylene-vinyl alcohol copolymer (EVOH) resin composition, which is prepared by polymerization and alcoholysis reaction, and the content of EVOH with ethylene content less than 15 mol% is less than 3 wt%. The present application also discloses a preparation method of the EVOH resin composition. The EVOH resin composition prepared by the present application has the content of EVOH with ethylene content less than 15 mol% less than 3 wt%, and the processing performance is significantly improved, the yellowing at high temperature is obviously reduced, and the defect number after melt blowing is reduced; thus the multilayer sheet, film and container prepared by the present application do not have crystal point, stripe and other defects.

The application discloses a kind of UV yellowing resistant cable protection pipe and preparation method thereof, it is related to polymer composite material and cable protection pipe technical field.A kind of UV yellowing resistant cable protection pipe, the cable protection pipe includes the following mass parts of raw material composition: matrix resin 100 parts, toughening agent 6-10 parts, compatible agent 1-5 parts, composite anti-UV yellowing agent 6-10 parts, inorganic reinforcing filler 10-15 parts, antioxidant 0.5-1.0 parts, lubricant 0.8-1.5 parts, flame retardant 8-15 parts.The composite anti-UV yellowing agent is multilayer organic-inorganic hybrid core-shell particle, the core-shell structure is through the synergistic effect of ultraviolet shielding, ultraviolet absorption, free radical capture, antioxidant complex and interface compatibility, significantly inhibit the surface yellowing and mechanical property attenuation caused by outdoor light oxygen aging, simultaneously improve the dispersibility of inorganic particle in polyolefin matrix, so that pipe material has excellent tensile strength, toughness, flame retardancy and long-term weathering stability.

The polymer of the present application is represented by the following general formula (P). In general formula (P), Y is a 1 to 6-valent organic group having 1 or more and 30 or less carbon atoms derived from a thiol group-containing compound having 2 or more functional groups, Chain contains a structural unit represented by the following general formula (AE-1) and a structural unit represented by the following general formula (AE-2), and n is an integer of 1 to 6.

The purpose of the present invention is to provide a method for producing a plate-shaped molded article having a fine convex shape on one main surface and having a large projected area on the main surface, wherein yellowing, appearance defects, and warpage of the molded article can be reduced. The present invention is a method for producing a plate-like molded article comprising a methacrylic resin composition having a glass transition temperature (Tg) of 115-160 DEG C and a melt viscosity of 20-235 Pa.sec under the conditions of 270 DEG C and 1000 sec <-1 >, the plate-like molded article being configured from a single resin composition without having an adhesive interface, and the sheet-like molded article being characterized in that: the sheet-like molded article contains a methacrylic resin composition having a glass transition temperature (Tg) of 115-160 DEG C and a melt viscosity of 20-235 Pa.sec under the conditions of 270 DEG C and 1000 sec <-1 >; one main surface (first main surface) of the plate-shaped molded article has a plurality of fine convex shapes, the other main surface (second main surface) is a flat surface, the height a of the convex shapes is 0.5-600 [mu] m, the ratio b / a of the pitch b to the height a of the convex shapes is 0.1-2.0, the projected area of the first main surface is 225 cm2 or more, and the projected area of the second main surface is 225 cm2 or more. The manufacturing method includes performing injection molding using a first mold on the first main surface side and a second mold on the second main surface side, the maximum temperature Tmax of the first mold being (Tg + 40) DEG C to (Tg + 70) DEG C, and the temperature of the second mold being (Tmax-90) DEG C to (Tmax-65) DEG C.