JP4749045B2 - Method for producing reinforced fiber for modified polyphenylene ether resin molding material, and fiber reinforced modified polyphenylene ether resin molding material - Google Patents

Description

  The present invention relates to a method for producing a reinforced fiber for a modified polyphenylene ether resin molding material used for obtaining a modified polyphenylene ether resin molded article having excellent mechanical strength, and the reinforcing fiber for a modified polyphenylene ether resin molding material obtained thereby is reinforced. The present invention relates to a fiber-reinforced modified polyphenylene ether resin molding material used as a fiber.

  The modified polyphenylene ether resin is a material excellent in heat resistance, durability, mechanical properties and the like, and is a resin molding material that is widely used as an engineering plastic. A long-fiber reinforced modified polyphenylene ether resin molding material reinforced with reinforcing fibers such as glass fibers is known in order to improve its mechanical properties, particularly impact resistance.

  However, many modified polyphenylene ether resins generally do not have a reactive functional group. Therefore, depending on the sizing agent applied to the single fiber, when it is kneaded with the modified polyphenylene ether resin to form a resin molded product, it tends to be inferior in mechanical properties or fiber dispersibility and poor in appearance.

  Therefore, in order to improve the adhesion between the modified polyphenylene ether resin and the reinforcing fiber and to improve the required properties such as mechanical strength of the molded product obtained by molding the molding material, it adheres to the reinforcing fiber. The selection of the sizing agent is extremely important.

In improving the adhesiveness with the modified polyphenylene ether resin, for example, in Patent Document 1 below, alkoxysilane having a phenyl group is reported to have good adhesiveness with the modified polyphenylene ether resin. There is disclosed a reinforcing fiber for a modified polyphenylene ether resin molding material obtained by surface-treating an alkoxysilane having at least one phenyl group at a treatment amount of 0.5 to 3.0% by mass.
Japanese Patent Laid-Open No. 2004-323783

  Since alkoxysilane having a phenyl group (hereinafter referred to as phenylalkoxysilane) is hardly soluble in water, it is usually necessary to use it by dissolving it in a large amount of solvent such as ethanol in combination with water. there were. Therefore, in order to increase the adhesion amount of phenylalkoxysilane to the strand, it is necessary to increase the amount of sizing agent applied, but a large amount of moisture (solvent) adheres to the strand along with it, The bundling property was inferior, it was difficult to spin the strands, and fluff was likely to occur. Moreover, since time is required in the subsequent drying step, the productivity tends to be inferior.

  Therefore, the present invention has been made in view of the above-mentioned problems, and the object thereof is a modified polyphenylene ether resin molding which has less fluff and is excellent in mechanical strength of a resin molded product obtained by reinforcing the modified polyphenylene ether resin. An object of the present invention is to provide a reinforcing fiber for material and a fiber reinforced modified polyphenylene ether resin molding material containing the reinforcing fiber.

  As a result of various investigations on a sizing agent component having good adhesion to the modified polyphenylene ether resin and good compatibility with water, the present inventors have found that aminosilane is particularly good. And as a result of earnestly examining about improving the adhesion amount of aminosilane, improving the convergence of a strand, it came to this invention.

That is, the production method of the modified polyphenylene ether resin molding material for the reinforcing fiber of the present invention, the glass fibers, imparting a primary treatment sizing agent containing a polyurethane resin and an amino silane coupling agent, by spinning the glass fiber strands And a secondary treatment step of cutting the strand into a chopped strand, and applying a secondary treatment sizing agent containing an aminosilane coupling agent as a main component to the chopped strand. The total adhesion amount of the primary treatment sizing agent and the secondary treatment sizing agent is 0.3 to 1.5 parts by mass in terms of solid content with respect to 100 parts by mass of the strand, and the aminosilane coupling agent adhesion amount Is 0.1 to 1.0 part by mass in terms of solid content.

  According to this, since the stranding property of the strand is good, the generation amount of fluff is small. And since the adhesion amount of the aminosilane coupling agent can be increased without degrading the convergence, the adhesion with the modified polyphenylene ether resin can be improved, and a modified polyphenylene ether resin molded product having excellent mechanical strength can be obtained. It is done.

  In the primary treatment step, the amount of the aminosilane coupling agent in the primary treatment sizing agent is 0.02 to 0.3 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strand, and the secondary treatment. It is preferable that the adhesion amount of the aminosilane coupling agent in the secondary treatment sizing agent in the step is 0.18 to 0.7 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strands. Moreover, it is preferable that the adhesion amount of an aminosilane coupling agent shall be 0.3-0.8 mass part in conversion of solid content with respect to 100 mass parts of the said chopped strands. The solid content of the aminosilane coupling agent contained in the secondary treatment sizing agent is 2-10 times the mass ratio of the solid content of the aminosilane coupling agent contained in the primary treatment sizing agent. It is preferable to use an agent. Moreover, it is preferable to use a polyether polyurethane resin as the polyurethane resin. And it is preferable to use a monoaminosilane coupling agent as an aminosilane coupling agent used for the said secondary processing sizing agent.

  On the other hand, in the fiber-reinforced modified polyphenylene ether resin molding material of the present invention, the reinforcing fiber for the modified polyphenylene ether resin molding material obtained as described above is added to the modified polyphenylene ether resin, so that the fiber content is 5 to 60% by mass. It is characterized by that. By molding this molding material, a modified polyphenylene ether resin molded article having excellent mechanical strength can be obtained.

  According to the present invention, it is possible to obtain a reinforcing fiber that has good strand convergence and a large amount of aminosilane coupling agent. Moreover, since the aminosilane coupling agent has good adhesion to the modified polyphenylene ether resin, the reinforcing fiber of the present invention can impart a high reinforcing effect to the modified polyphenylene ether resin. And the fiber-reinforced modified polyphenylene ether resin molding material using the reinforcing fiber can provide a modified polyphenylene ether resin molded product having excellent mechanical strength.

The reinforcing fiber for a modified polyphenylene ether resin molding material of the present invention is obtained by applying a secondary treatment sizing agent to a strand obtained by applying a primary treatment sizing agent to glass fibers and focusing a predetermined number of fibers. It is.

In the present invention, 100 to 4000 present a glass fiber sizing agent, Ru preferably focuses present 800 to 3,000.

The average fiber diameter of the glass fibers are 6～23Myuemu, preferably 9～16Myuemu.

  The primary treatment sizing agent used in the present invention contains a polyurethane resin and an aminosilane coupling agent as main components.

  The polyurethane resin used for the primary treatment sizing agent is necessary for improving the sizing property of the strand and the adhesion to the matrix resin, and is formed from a polymer polyol, an organic diisocyanate, and, if necessary, a chain extender and / or a crosslinking agent. The conventionally known ones can be preferably used, and are preferably used in the form of an aqueous dispersion such as an emulsion or a dispersion.

  Specific examples of the polymer polyol include, for example, polyester polyol [polyethylene adipate diol, polybutylene adipate direel, polyethylene butylene adipate diol, polyneopentyl adipate diol, polyneopentyl terephthalate diol, polycaprolactone diol, polyvalerolactone diol. Polyhexamethylene carbonate diol, etc.] and polyether polyols [polyethylene glycol, polypropylene glycol, polyoxyethyleneoxypropylene glycol, polyoxytetramethylene glycol, ethylene oxide and / or propylene oxide adducts of bisphenols, etc.].

  Specific examples of the organic diisocyanate include, for example, aromatic disissocyanate [2,4′- or 4,4′-diphenylmethane diisocyanate (MDI), 2,4- or 2,6-tolylene diisocyanate (TDI), 4,4′-dibenzyl diisocyanate, 1,3- or 1.4-phenylene diisocyanate, 1,5-naphthylene diisocyanate, xylylene diisocyanate (XDI), etc.], aliphatic diisocyanate [ethylene diisocyanate, hexamethylene diisocyanate (HDI) ), Lysine diisocyanate, etc.], cycloaliphatic diisocyanate [isophorone diisocyanate (IPDI), 4,4′-dicyclohexylmethane diisocyanate (H12MDI), etc.]. Good.

  The chain extension and / or crosslinking agent is preferably an active hydrogen-containing compound having a number average molecular weight of less than 60 to 500, such as a polyhydric alcohol [ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butanediol. 1,6-hexanediol, 3-methylpentanediol, diethylene glycol, neopentyl glycol, 1,4-bis (hydroxymethyl) cyclohexane, 1,4-bis (hydroxyethyl) benzene, 2,2-bis (4 4′-hydroxycyclohexyl) propane and other dihydric alcohols; glycerin, trimethylolpropane and other trihydric alcohols; pentaerythritol, diglycerin, α-methylglucoside, sorbitol, xylit, mannitol, dipentaerythritol, glucose, Lactose, sucrose and other 4- to 8-valent alcohols], polyphenols (pyrogallol, catechol, hydroquinone, bisphenol A, bisphenol F, bisphenol S, etc.), polyamines [aliphatics such as ethylenediamine, hexamethylenediamine, diethylenetriamine, etc. Polyamines; alicyclic polyamines such as isophorone diamine and 4,4′-dicyclohexylmethanediamine; aromatic polyamines such as 4,4′-diaminodiphenylmethane; aromatic alicyclic polyamines such as xylylenediamine, hydrazine or derivatives thereof, etc. ], Water, etc. are mentioned.

  In the present invention, the polyol component of the polyurethane resin is preferably a polyether polyol among the polymer polyols listed above. As the isocyanate component of the polyurethane resin, among the organic diisocyanates listed above, aliphatic diisocyanates such as HDI and alicyclic diisocyanates such as IPDI are more preferable because they can suppress the coloring of the molded product.

In addition, the aminosilane coupling agent used in the primary treatment sizing agent of the present invention imparts an organic functional group to the fiber surface to improve the adhesion with the matrix resin, and further improves the adhesion between the glass fiber and the urethane resin. Such aminosilane coupling agents are necessary for improving the stranding property of the strand. Examples of such aminosilane coupling agents include γ-aminopropyltriethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N Specific examples include -β- (aminoethyl) -N'-β-aminopropyltriethoxysilane, γ-anilinopropyltrimethoxysilane, and the like. And from the reason of high mechanical strength and low coloration, monoaminosilane-based coupling agents such as γ-aminopropyltriethoxysilane are preferred.

  The solid content of the urethane resin contained in the primary treatment sizing agent is preferably 0.5 to 20% by mass, more preferably 1.0 to 10% by mass. If it is less than 0.5% by mass, there is a possibility that the convergence will be inferior and fluff will be generated, or the adhesiveness with the matrix resin will be insufficient and the strength of the molded product will decrease. Moreover, it is preferable that solid content of an aminosilane coupling agent is 0.1-3 mass%, More preferably, it is 0.2-1.5 mass%. If the amount is less than 0.1% by mass, the adhesiveness to the matrix resin is insufficient and the strength of the molded product may be lowered. Even if the amount exceeds 3% by mass, an improvement in strength cannot be expected.

  The primary treatment sizing agent of the present invention may further contain various additives such as a surfactant, a lubricant and an antistatic agent in addition to the above components.

  As the surfactant, nonionic surfactants are preferable, and examples thereof include ethylene oxide propylene oxide copolymers, synthetic alcohols, natural alcohols, fatty acid esters, and distyrenated phenols.

  Examples of the lubricant include fatty acid amides and quaternary ammonium salts. Examples of the fatty acid amide include dehydration condensates of polyethylene polyamines such as diethylenetriamine, triethylenetetramine, and tetraethylenepentamine with fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid. Moreover, as a quaternary ammonium salt, lauryl trimethyl ammonium chloride, an alkyl trimethyl ammonium salt, etc. can be used.

  Examples of the antistatic agent include inorganic salts such as lithium chloride and potassium iodide, and quaternary ammonium salts such as ammonium chloride type and ammonium ethosulphate type.

  The secondary treatment sizing agent used in the present invention contains an aminosilane coupling agent as a main component.

  The aminosilane coupling agent used in the secondary processing sizing agent is necessary to form an amino group on the surface layer of the strand (chopped strand) and to improve the adhesion between the reinforcing fiber and the modified polyphenylene ether resin as the matrix resin. As such an aminosilane coupling agent, the same ones that can be used in the primary treatment sizing agent can be used, and it is particularly preferable to use a monoaminosilane coupling agent. The primary treatment sizing agent and the aminosilane coupling agent contained in the secondary treatment sizing agent may be the same or different.

  And it is preferable that solid content of the aminosilane coupling agent contained in a secondary processing sizing agent is 1-60 mass%, More preferably, it is 5-40 mass%. If it is less than 1% by mass, it is difficult to ensure a sufficient amount of aminosilane attached to the strands (chopped strands), and the adhesion to the modified polyphenylene ether resin may be insufficient. Also, hydrolyzing 60% by mass of the aminosilane coupling agent results in a relatively small amount of water, making it difficult to produce.

  Further, the secondary treatment sizing agent may further contain various additives such as urethane resin, surfactant, lubricant, antistatic agent and the like in addition to the aminosilane coupling agent, if necessary. These urethane resins and various additives can be the same as the primary treatment sizing agent. In addition, it is preferable that the solid content of these components in the secondary treatment sizing agent is less than 20% by mass in total.

  The fiber-reinforced modified polyphenylene ether resin molding material of the present invention is obtained by using a modified polyphenylene ether resin as a matrix resin and adding the reinforcing fibers. The modified polyphenylene ether resin is not particularly limited, and is a styrene homopolymer such as polystyrene, poly α-methylstyrene, polychlorostyrene, modified styrene such as rubber-modified polystyrene, styrene, α-methylstyrene, vinyltoluene, Examples thereof include copolymers obtained by graft polymerization of chlorostyrene and the like. Examples of such a modified polyphenylene ether resin include (trade name; “Noryl SE1-802” manufactured by GE).

  The fiber content is 5 to 60% by mass, preferably 15 to 45% by mass. If the fiber content is less than 5% by mass, the mechanical strength is poor and is not suitable for practical use. If the fiber content exceeds 60% by mass, the fiber is damaged so much that the strength cannot be improved so much and the fluidity during molding may be inferior. There is.

  In the present invention, the method for producing the reinforcing fiber is not particularly limited, and various conventionally known methods can be used.

For example , the molten glass is drawn out from a number of nozzles attached to the bottom of the bushing to form glass fibers having a fiber diameter of preferably 6 to 15 μm, and a primary processing sizing agent is applied to the glass fibers with an applicator or spray, Preferably, 800 to 3000 strands are bundled into strands, and the strands are preferably cut to 1.5 to 6.0 mm. At that time, the glass strand may be wound once and then cut, or may be cut as it is without being wound. In addition, it is preferable that the moisture content at the time of cut | disconnecting a strand is 3-15 mass%, More preferably, it is 5-12 mass%. When the water content is less than 3% by mass, the strands are likely to be broken during cutting and fluff is likely to occur. On the other hand, if it is more than 15% by mass, it is not preferable because it requires time and effort in the subsequent drying step.

  And as application amount of a primary processing sizing agent, it is preferable that it is 0.1-1.2 mass parts in conversion of solid content with respect to 100 mass parts of strands, More preferably, it is 0.2-0.8 mass parts It is.

  The applied amount of the urethane resin is preferably 0.1 to 1.2 parts by mass, more preferably 0.2 to 0.8 parts by mass in terms of solid content with respect to 100 parts by mass of the strand. When the applied amount of the urethane resin is less than 0.1 parts by mass, the stranding property tends to be inferior and fluff tends to occur. When the amount is more than 1.2 parts by mass, the strands are not sufficiently opened and molded. In addition to the undispersed defect on the surface of the product, there is a possibility that the mechanical strength is lowered.

  Moreover, as an application amount of an aminosilane coupling agent, it is preferable that it is 0.02-0.3 mass part in conversion of solid content with respect to 100 mass parts of strands, More preferably, 0.03-0.2 mass part It is. If the amount is less than 0.02 parts by mass, the stranding property tends to be inferior and fluff tends to occur. If the amount is more than 0.3 parts by mass, the adhesiveness to the matrix resin is insufficient and the strength of the molded product is low. There is a possibility that the strength is lowered, and even if the amount exceeds 0.3% by mass, an improvement in strength cannot be expected.

Next, a secondary treatment sizing agent is applied to the chopped strand. When applying this secondary treatment sizing agent, applying the secondary treatment sizing agent while applying vibration to the top, bottom, left and right, etc., or after applying the secondary processing sizing agent, applying vibration to the top, bottom, left and right, etc. preferable. By doing so, the glass fibers can sufficiently adhere to each other, and a chopped strand having good convergence can be obtained.

  And as a secondary processing sizing agent, the solid content of the aminosilane coupling agent may be 1 to 10 times the mass ratio of the solid content of the aminosilane coupling agent contained in the primary processing sizing agent. Preferably, it is 2 to 5 times. If it is less than 1 time, the adhesiveness to the matrix resin is insufficient, and the strength of the molded product may be lowered, and even if the amount exceeds 10 times, improvement in strength cannot be expected.

  The amount of the secondary treatment sizing agent applied is preferably 0.18 to 0.9 parts by mass, more preferably 0.2 to 0.7 parts by mass in terms of solid content with respect to 100 parts by mass of chopped strands. It is.

  Moreover, it is preferable to provide the secondary treatment sizing agent so that the amount of the aminosilane coupling agent applied is 0.18 to 0.7 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strands. Is 0.2 to 0.5 parts by mass. If the amount is less than 0.18 parts by mass, the strength of the resulting molded product tends to be insufficient, and if the amount is more than 0.7 parts by mass, an improvement in the reinforcing effect of the molded product cannot be expected.

  And the total adhesion amount of a primary processing sizing agent and a secondary processing sizing agent shall be 0.3-1.5 mass parts in conversion of solid content with respect to 100 mass parts of chopped strands, Preferably it is 0.5-1. 2 parts by mass. Moreover, the total adhesion amount of an aminosilane coupling agent shall be 0.1-1.0 mass part in conversion of solid content with respect to 100 mass parts of chopped strands, Preferably it is 0.3-0.8 mass part. If the adhesion amount of the sizing agent and aminosilane coupling agent is within the above range, the strands have good sizing properties, and sufficient adhesion with the modified polyphenylene ether resin can be secured. A modified polyphenylene ether resin molded article having excellent aqueous properties can be provided.

  The amount of sizing agent applied is a value calculated based on the ignition loss measurement method based on JIS-R-3420.

  Subsequently, it moves to the drying process of a chopped strand. The drying temperature and the drying time are arbitrary and not particularly limited, but the drying temperature is set to 100 to 250 ° C. and the drying time is set to 10 to 100 seconds without impairing the convergence and efficiently performing the drying process. It is preferable to do.

  Thus, the reinforcing fiber for a modified polyphenylene ether resin molding material of the present invention is obtained.

  Moreover, a fiber-reinforced modified polyphenylene ether resin molding material can be obtained by adding and mixing the above-mentioned reinforcing fibers to the molten modified polyphenylene ether resin.

  In the present invention, the method for producing the fiber-reinforced modified polyphenylene ether resin molding material is not particularly limited, and various conventionally known methods can be used.

  For example, while the molten modified polyphenylene ether resin is plasticized from a screw extruder, the reinforcing fiber is supplied and melt kneaded. The melt-kneaded product is molded into a linear fiber-reinforced modified polyphenylene ether resin molding material, and then cut with a pelletizer or the like to obtain a fiber-reinforced modified polyphenylene ether resin molding material. Further, a fiber-reinforced modified polyphenylene ether resin molding material can be obtained by a known method using an injection molding machine.

  Hereinafter, the present invention will be specifically described with reference to examples. However, these examples are illustrative of embodiments of the present invention and are not intended to limit the scope of the present invention.

[Preparation of specimen]
3,000 glass fibers having an average diameter of 13 μm were bundled, and a primary treatment sizing agent was applied so that each component had an adhesion amount shown in Table 1 to obtain glass strands. Then, this glass strand was cut | disconnected to 3 mm, it was set as the chopped strand, the secondary treatment bundling agent was provided so that it might become the adhesion amount shown in Table 2, and it was made to dry, and the reinforced fiber was obtained. This reinforcing fiber is added to modified polyphenylene ether (trade name; “Noryl SE1-802” manufactured by GE) and melt-mixed using a single screw extruder with a screw diameter of 40 mm under the conditions of a rotation speed of 65 rpm and a cylinder temperature of 300 ° C. By extrusion, a pellet-shaped molding material having a glass content of 30% by mass was obtained. Then, this molding material is molded under the conditions of a back pressure of 5 kgf / cm ² , a rotation speed of 55 rpm, a cylinder temperature of 300 ° C., and a mold temperature of 80 ° C., using an injection molding machine with a mold clamping of 75 t. Obtained.

[Performance evaluation of reinforcing fibers]
<Evaluation of convergence (blend value)>
The amount of fluff generated when 3 kg of reinforcing fiber was put into a V blender having a comb-like rod inserted therein and stirred and mixed for 15 minutes was measured. If the fluff weight was 2 g or less, it was judged that the convergence was good.
[Performance evaluation of resin molding materials]
<Tensile strength measurement>
It was measured by a method based on ASTM D-638 and judged to be good if it was 95 MPa or more.

<Measurement of bending strength>
It was measured by a method based on ASTM D-790 and judged to be good if it was 150 MPa or more.

<Measurement of bending strength>
It measured by the method based on JIS-K-7171.

<IZOD impact strength measurement>
It measured with the method based on ASTM D-256 with a 1/8 inch notch, and judged that it was favorable if it was 7.5 KJ / m < ² > or more.

<Heat resistant water>
The tensile strength of the reinforcing fiber after the tensile test piece was put into autoclave water and treated at 120 ° C. for a predetermined time was measured. It was judged that the tensile strength after 100 hr treatment was 90 MPa or more and the tensile strength after 500 hr treatment was 80 MPa or more.

The above evaluation is performed on the reinforcing fibers and the molding materials of Examples 1 to 4 and Comparative Examples 1 to 10, and the results are summarized in Table 2.

  From the above results, Comparative Examples 1 and 2 in which the secondary treatment sizing agent was not applied were inferior in mechanical strength and water resistance of the resin molded product.

  Further, the reinforcing fibers of Comparative Examples 3, 4, 8, 9, and 10 in which the coupling agent applied to the reinforcing fibers is other than the aminosilane coupling agent are easily fluffed, and the resin using the reinforcing fibers as a reinforcing material The molded product was inferior in tensile strength and impact strength.

  Further, the reinforcing fibers of Comparative Examples 5, 6, 8, and 9 using a primary treatment sizing agent that did not contain a urethane resin had a very large amount of fluff generation.

  And the comparative example 7 using the thing which does not contain an aminosilane coupling agent as a primary processing sizing agent was inadequate in adhesiveness with modified polyphenylene ether resin, and was inferior in tensile strength.

  On the other hand, Examples 1-4 which used what contains an aminosilane coupling agent as a main component as a secondary processing bundling agent were used as a primary processing bundling agent, and the thing containing aminosilane coupling agent and urethane resin was used as a bundling. A resin molded product that is a reinforced fiber with good properties and that uses the reinforcing fiber as a reinforcing material has excellent physical properties such as mechanical strength and water resistance. Among them, a polyether polyurethane resin is used as the urethane resin of the primary treatment sizing agent, a monoaminosilane coupling agent is used as the aminosilane coupling agent of the secondary treatment sizing agent, and the total adhesion amount of the aminosilane coupling agent is 0.3 mass. Part 1 or more of Example 1 was extremely excellent in mechanical strength and water resistance.

  Reinforced fiber with less fuzz and good resin impregnation property can be obtained, and the fiber-reinforced modified polyphenylene ether resin molding material using the reinforcing fiber can be a resin molded product having excellent mechanical strength. It can be suitably used as a plastic.

Claims (7)

Glass fiber, impart primary treatment sizing agent containing a polyurethane resin and an amino silane coupling agent, a primary processing step of the strand by spinning the glass fiber, and chopped strands by cutting the strand, the chopped A secondary treatment step of providing a strand with a secondary treatment sizing agent containing an aminosilane coupling agent as a main component;
The total adhesion amount of the primary treatment sizing agent and the secondary treatment sizing agent is 0.3 to 1.5 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strand, and the aminosilane coupling agent The manufacturing method of the reinforced fiber for modified polyphenylene ether resin molding materials characterized by making adhesion amount into 0.1-1.0 mass part in conversion of solid content.   In the primary treatment step, the adhesion amount of the aminosilane coupling agent in the primary treatment sizing agent is 0.02 to 0.3 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strand, and in the secondary treatment step The modified polyphenylene according to claim 1, wherein the adhesion amount of the aminosilane coupling agent in the secondary treatment sizing agent is 0.18 to 0.7 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strands. A method for producing a reinforcing fiber for an ether resin molding material.   The reinforcing fiber for a modified polyphenylene ether resin molding material according to claim 1 or 2, wherein the amount of the aminosilane coupling agent attached is 0.3 to 0.8 parts by mass in terms of solid content with respect to 100 parts by mass of the chopped strands. Manufacturing method.   A secondary treatment sizing agent in which the solid content of the aminosilane coupling agent contained in the secondary treatment sizing agent is 1 to 10 times the mass ratio of the solid content of the aminosilane coupling agent contained in the primary treatment sizing agent. The manufacturing method of the reinforced fiber for modified polyphenylene ether resin molding materials as described in any one of Claims 1-3 used.   The method for producing reinforcing fibers for a modified polyphenylene ether resin molding material according to any one of claims 1 to 4, wherein a polyether polyurethane resin is used as the polyurethane resin.   The method for producing a reinforced fiber for a modified polyphenylene ether resin molding material according to any one of claims 1 to 5, wherein a monoaminosilane coupling agent is used as the aminosilane coupling agent used in the secondary treatment sizing agent. Reinforcing fiber for modified polyphenylene ether resin molding material obtained by the production method according to any one of claims 1 to 6 is added to the modified polyphenylene ether resin so that the fiber content is 5 to 60% by mass. A fiber-reinforced modified polyphenylene ether resin molding material.