JPS62135542A - Production of expanded amide resin molding - Google Patents

Abstract

PURPOSE:To obtain the titled molding having excellent mechanical characteristics and surface appearance, by adding a specified aliph. polyamide to at least one of molten omega-lactams contg. a polymn. catalyst (cocatalyst) and injecting or pouring the mixture into a mold. CONSTITUTION:At least three compds. selected from among at least three groups of aliph. dicarboxylic acids, diamines, aminocarboxylic acids and lactams are copolymerized to obtain an aliph. polyamide (C) soluble in molten omega-lactam. The component (C) is added to at least one of a molten omega-lactam (a) contg. a polymn. catalyst and an omega-lactam (h) contg. a cocatalyst which is a functional acid halide or a functional acyllactam selected from compds. of formulas I-V [wherein A is halogen, a group of formula VI; Y is a 3-11C alkylene; a is 1-3; b is 1 or above; R1 is an alkyl(oxy), etc.; R2 is a bi- or polyvalent group selected from among hydrocarbon groups and hydrocarbons having an ether linkage; Z is a polyether having an MW of at least 2,000, etc.]. The mixture is injected or poured into a mold.

Description

[Detailed description of the invention]

[industry! Field of Application of -1 1 The present invention relates to a method for producing an amide resin foam molded product. More specifically, it relates to a method for producing amide-based resin casting foam molded products and reaction injection foam molded products, which are easy to repeat during molding, and the obtained molded products have good mechanical properties. , relates to a method for producing a molded product that improves the surface appearance by stabilizing the air bubbles generated by foaming, suppressing the generation of voids on the surface of the molded product, and making the air bubbles in the molded product finer and more uniform. . ``Junibei Technique 1 In recent years, highly reactive liquid raw materials are injected or injected into a mold,
Polymerization and molding with gold 1. ! 9 to directly obtain a molded article, the so-called reaction injection molding method or pour molding method is attracting attention. Conventionally, polyurethane molded products have made great progress using the above molding method, but recently polyamide,
New materials such as unsaturated polyester and epoxy are also beginning to be used. Among them, polyamide has strong toughness, high rigidity,
It has excellent heat resistance, friction resistance, and wear characteristics.
Furthermore, due to the good fluidity of the raw material composition and the low heat generation during polymerization, molding can be performed at low injection pressure, the transferability of the mold surface is good, and it is possible to mold from thin to thick walls. Since molded products can be obtained at will, it is attracting particular attention as a material for reaction injection molding and cast molding. The uR of such polyamide is produced, and gold 7 (+4
A method of foaming during molding has been proposed in order to improve the filling properties of molded products, reduce sink marks, warpage, etc., and reduce the weight of molded products. -1; As a method for obtaining a foamed molded article that meets the above purpose, there is a method described in JP-A-60-18332. However, according to experiments conducted by the present inventors, when molding is performed using this method, air bubbles appear on the surface of the molded product, pinholes, voids, etc. are created on the surface of the molded product, and agglomeration of air bubbles occurs. It has been found that there is a drawback that the internal bubbles become coarse and non-uniform, making it impossible to obtain a molded product with a good surface appearance. In addition, in reaction injection molding, cast molding, etc. of polyurethane, silicone surfactants, etc. are blended into the raw material composition, and the foam regulating effect of this makes the surface appearance, internal bubbles finer, and more uniform. However, amide type 0 (
It has been found that these foam stabilizers are not sufficiently effective in reaction injection molding and cast molding of oils. The appearance of amide resin reaction injection molded products and cast molded products is extremely good compared to, for example, reaction injection molded products or cast molded products such as polyurethane.

[This is a great advantage because the appearance is maintained well even when post-processing the pot 1, 7, 51-1, and 51-1+. Therefore, a foam molded product that maintains these excellent characteristics! ! ! It was hoped that a new method would emerge. 1. Problem 1 that the present invention attempts to solve 1. +8 When manufacturing resin foam molded products using reaction injection molding or cast molding, the molded product has fine and uniform air bubbles inside the molded product without pinholes, voids, or agglomeration of air bubbles on the surface of the molded product. The purpose is to provide a way to obtain. [Means for Solving the Problems 1] However, the gist of the present invention is that the amide tree IJ
II. In producing the foamed molded article, at least one of the omega-lactam melt containing the monomer catalyst and the omega-lactam melt containing the m-cocatalyst is added to the omega-lactam melt soluble in the omega-lactam melt. The present invention relates to a method for producing an amide-based resin foam molded article, which comprises blending polyamides and injecting or injecting the mixture into a mold to form a molded article. The present invention will be explained in detail below. Amide R+H fat reaction injection molding or note 1! In molding, several types of raw materials used are prepared separately into two component systems or h compositions, and during molding, the raw material compositions divided into two component systems or h are mixed by impact mixing or The materials are combined using a clay state mixer, a Guina mink mixer, etc., and polymerization and molding are performed simultaneously within the metal rim. In amide resin reaction injection molding or cast molding, 2
One component system (hereinafter referred to as component system (A)) of the raw material composition consisting of component systems is a melt of a polymerization catalyst and ω-lactam, and the other component system (hereinafter referred to as component system (B)) is It consists of a host cocatalyst, various additives, and a molten omega-lactam. The polyamides that are soluble in the omega-lactam melt used in the method of the present invention improve the uniformity of the cells in the foamed molded product, causing pinholes, voids, agglomeration of air bubbles, etc. on the surface of the molded product. It functions to prevent unevenness from occurring on the surface of the molded product. However, as polyamides that are soluble in a melt of ω-lactam, the following four 'lj
fit group, i.e. (a) dicarboxylic acids, (11)
Examples include copolymers composed of at least three types of 'lj'Ql: body components selected from the group of at least three types of noaminos, (c) ami/carboxylic acids, and (d) lactams. As (a) dicarboxylic acids, which are one of the heavy electric substance group,
Ambic acid, sebacic acid, corkic acid, geltaric acid, azelaic acid, β-methyl 7nobic acid, terephthalic acid, isophthalic acid, decamethylene carboxylic acid, dodecamethylene carboxylic acid, 1,10-decanocarboxylic acid, pimeline Examples include acids. Among this group (a), 7 nobic acid and sebacic acid are preferred. (b) Examples of the amino acids include ethylene diamine, tetramethylene diamine, hexamethylene diamine, octamethylene diamine, decamethylene diamine, metaxylene diamine, paraxylene diamine, and the like. Among this group (b), hexamethylene diamine is preferred. (c) Amino/carboxylic acids as a monocholine group include 6
-7 minocaproic acid, 7-7 mi/7 enanthic acid, 9-amino/nonanoic acid, 11-aminoundecanoic acid, 17-7 mi/
Examples include heptadecanoic acid. (d) Lactams include ε-caprolactam, enantlactam, caprylolactam, ε-undeca/lactam, ω-laurinlactam, decyllactam, andecyllactam, and the like. At least 3 of the above 4 groups (a)-u(d)
A copolymer composed of at least three kinds of Ill electric components selected from the following groups can be easily produced by a known method for producing polyamides. The Hokki polyamides used in the present invention can be added to either the component system (A) or the component system (B),
It is also possible to add it to both component system (A) and component M (B) at the same time. One example of an omega-lactam shellfish used in the present invention is:
Examples include γ-butyrolactam, δ-valerolactam, ε-caprolactam, ω-enantholactam, ω-cabryl lactam, ω-undecanolactam, and ω-laurinlactam. These ω-lactams may be used alone or in combination of two or more. As the polymerization catalyst contained in the component system (A), the known ω
- Any compound used in the 7-ion polymerization of lactams can be used. Examples include alkali metals, alkaline earth metals, their hydrides, oxides, hydroxides, carbonates, alkyl compounds, aryl compounds, alkoxides, Grignard compounds, and the metal compounds mentioned above. and reaction products of ω-lactams, such as sodium salts, potassium salts of ω-lactams,
Magnesium halide salt etc.1. The amount of polymerization catalyst used is based on the total ω-lactam, ('1.01~1
5, or 2 (mol% or more). Regarding the one-piece catalyst contained in the component system (B), ω-
Any compound known to Io Ogawa 5-1 can be used in the 7-ion deuterium of lactam. Specific examples thereof include incyanates such as toluene noisocyanate), 4,4'-nophenylmethane diisocyanate, hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, and carboimide-modified noisocyanate; Hexamethylene-1,6-piscarbamite, caprolactam, N,N'-diphenyl-
P-phenylene biscarbamint caprolactam, N. N'-nophenyl-P-phenylene biscarbamate V,
Carbamide lactams such as pyrrolidone, acid halides such as terephthaloyl chloride, 7-dipic acid chloride, and sebacic acid chloride, polyacyls such as adipoyl biscaprolactam, adipoyl bispyrrolidone, terephthaloyl biscaprolactam, and terephthaloyl bispyrrolidone. lactams, or formula /nJ C, alkylene), and a is 1.2
or 3, b is an integer of 2 or more], R1 is an alkyl group, an aralkyl group, an alkyloxy group, an aryloxy group, a halogen group, or an aralkyloxy group, and R7 is a carbonized is a divalent or higher group selected from hydrocarbons containing hydrogen groups and ether bonds, and Z is (1) a polyether having a minimum molecular weight of about 2,000; (2) a polyether having a minimum molecular weight of about 2,000; or (3) an acid halide-functional material or a lactam-functional material selected from the group consisting of (3) a hydrocarbon having a minimum molecular weight of 1,000. The component system (B) can contain crosslinks (, 5 cuts, modifiers (soft segments), etc. that enter the polymer chain when reacting with the component system (A) in the mold. Examples of the compound include compounds having a polyvalent hydroxyl group, a mercapto group, an amide group, and an epoxy group. Polyvalent hydroxyl7. Examples of compounds with a % of alkylene glycols such as diethylene glycol, ° triethylene glycol, tetraethylene glycol, tetramethylene glycol, propylene glycol, dipropylene glycol, xylene glycol, 1.2
-propanol, 1,3-propanol, 1,
3-hexaneol, butylene glycol, 1.4-
Butanol, nocyclopentanoene glycol, heptaethyleneglyfur and impropylidene bis(
Polyols other than P-phenyleneoxypropa7-2Lfulkylene glycol, such as glycero-+1.
# N * f II -I II
k -11-+ 9a -a 4 -I
J--/triols and 1-trimethylolpropane, polymeric polyols such as polyethylene glycol,
Polypropylene glycols, polyoxypropylene nols, and triols, polytetramethylene glycols, castor oil, polybutanoene glycols, polyester glycols, poly(ε-cabrolactone) diols and numerous compounds containing substituents other than hydroxy groups, such as 2゜4-Nochlorobutyleneglyfur etc. ζ) Alternatives. Examples of compounds having a polyvalent mercapto group include hydroxyethyl thioglycolate, ethylene glycol bis(thio-glycolate), pentaerythritol tetrakis-(thioglycolate), and thionoglyfur, which have a polyvalent amide 7 group. Compounds include hexamethylene diamine, tolylene diamine, 2,4-noethyl tolylene diamine, polyoxyethylene diamine, polyoxypropylene diamine and triamine, polyoxypropylene diamine, copolymerized polyamide with 7 amino terminal groups, etc. Compounds with polyvalent epoxy groups include resorcinol noglycinole ether, diglycinole ether to bisphenol, vinylic acid noglycinole ether, butanediol noglycinole ether, polyglycinol ester of polycarboxylic acid, and epoxidized Polyolefins and glycylate ether a (fat), epoxy/borac δ (fat, etc.) are included. The component system (B) further contains compounds that naturally do not inhibit the normal reaction, such as plasticizers, dyes and pigments, and antioxidants. A mold release agent, an internal mold release agent, etc. can be blended.Next, to describe the method for manufacturing an amide-based a (fat molded product) according to the present invention, first, a polymerization catalyst is added to an ω-lactam,
The component system (A) is heated to a temperature below the melting point of the ω-lactam (for example, 70°C or higher when the ω-lactam is caprolactam).
Make a molten substance. This melt of component system (A) is maintained at a temperature below 100 DEG C. due to its own polymerization reaction ratio of 11-. Similarly, for component system (II), a polymerization cocatalyst, additives, etc. are added to ω-lactam, heated above the melting point of ω-lactam, and maintained at 140°C or below to form an r-18 melt. . Next, the above [! In the component system, the total amount of polyamides specified in one prefecture in the present invention, which has a required electric power for the total amount of the two-component polyamide component, is added to the component system (Δ).
Only in force, or part of the component system < A) or component system 1), the rest to component system (B) or component system (A),
Alternatively, it is evenly mixed into component system (l\) and component system (13). The above-mentioned distributive mixing of polyamides is determined each time depending on the viscosity of the component system (Δ) or component system (B), the type of ω-lactam, etc. In the method of the present invention, a blowing agent is added to the raw material composition. Foaming materials used in the method of the present invention include nitrogen gas, dry air, inert gases such as argon and helium, and low-boiling organic compounds such as hebutane, pentane, hexane, cyclohexane, and benzene. (If the blowing agent is an inert gas,
A preferred method is to dissolve or disperse the component in one or both of component system (A) and component system (B) in a tank. When the blowing agent is a low-boiling organic compound, it is preferably dissolved in one or both of component system (A) and component system (B) in a tank. The amount of the blowing agent to be dissolved or dispersed in the raw material composition can be varied depending on the purpose of the molded article to be manufactured, the properties of the molded article, the 11'IIM of the blowing agent used, the porosity of the molded article, etc. The porosity of a molded article refers to the volume ratio of fine air bubbles formed in the molded article by a blowing agent to the molded article. The porosity of the molded article is preferably in the range of 0, 1-90%. When the porosity is 0.1% or less, there are few air bubbles formed in the molded product, so there are no pinholes or holes on the surface of the molded product.
The problem of voids and bubble aggregation does not occur. If the porosity is 90% or more, too many bubbles will be generated in the molded product, making it difficult to achieve the object of the invention, which is not preferable. As per 1-, the following procedure is used to produce a foamed molded product from amyl'-based cedar (fat molding composition) in which the foamed shavings are dissolved or dispersed: First, The two components of the component system (A) and the component system (B) can be mixed by collision in a device called a mixing hand, or by (soil state 7).
Stir and mix using a mink mixer or a mink mixer. The mixing ratio of component system (A) and component system ([ is S!
! It can be changed depending on the ITI application of the molded product to be sent and the properties to be prepared. The mixing ratio in this case is preferably in the range of 5/1 to 115 by volume. The mold temperature during molding is 1' (1 (1...,
It is preferable to maintain the temperature in the range of 20G'C, preferably 120..7160°C. In the mold, the component system (A) and the components, v. (B) causes a chemical reaction, and gold 1 (hardens or solidifies within a short time after injection, depending on the size of the molded product, within 4 minutes, and in some cases within 2 minutes, and the chemical reaction ends. After the chemical reaction is complete, the product removed from the mold is ■
] It is a molded product. [Effect of the invention 1 The present invention is as explained below, and has particularly remarkable effects as follows, and its utilization value in industry 1- (】) When using the method of the present invention, flexible polyamides are blended into the raw material ω-lactam melt, and the ω-lactam melt blended with this has good fluidity and is stable. Therefore, it is easy to handle, and the vertical molding and \ injection during molding is i'+' 54. (2) When the method of the present invention is used, the polyamide compounded in the omega-lactam melt is This function improves the uniformity of the bubbles in the foam molded product and suppresses pinholes, voids, and unevenness on the surface of the molded product caused by the agglomeration of air bubbles, resulting in a foam molded product with an excellent appearance. (3) Since the foamed molded product obtained by the method of the present invention has fine and uniform λ, the foamed molded product has excellent properties such as tensile strength. 1 Example 1 Next, the present invention will be explained with reference to Examples and Comparative Examples, but the present invention is not limited to the following examples as long as the essential points 19 are not exceeded. The polyamides soluble in the omega-lactam melt used in the following examples are as follows: Evaluation of the appearance of the obtained molded product, average cell diameter of the molded product, porosity, and bending of the molded product stiffness, tensile strength and elongation;
The measurements were carried out according to the following method. Nylon M- is a copolymer containing five monomer components: ω-caprolactam, hexamethylenezamine, anovic acid, sebacic acid, and lauryl lactam, and as a polyamide, it is nylon 6, nylon 66: nylon 610: nylon. 6
The composition ratio of No. 12 is 5:45:45:5 and the average molecular weight is about 70.00 ('). It is a copolymer containing nylon ω-caprolactam, hexamethylene diamine, ano-acid, and ε-7/lauryllactam, and when expressed as a polyamide, it has a composition of nylon 6, nylon 66: nylon 12. The ratio is 2
:2:3, and its average molecular weight is approximately 80,00 (1
Of things. The appearance of the molded product was mainly evaluated by n-view observation, but in some cases, a surface roughness tester (Model SE-:'IA, manufactured by Complaint Research Institute) was used to evaluate the appearance. The display criteria for the results are: ◎; Best; ○; Good; △;
It was set as the 412th floor of town, ×; not possible. Measurement of porosity of molded product A dry test piece is cut out from the knee molded product and JISK-6
I stopped at 911 and measured the ratio, and calculated i1% using the following formula.
l-ta. ×100 Measurement of average bubble diameter in molded product A thin section was cut from the cross section of the flower of the molded product and the bubble diameter was measured using an optical microscope, and the number average was taken as the average bubble diameter. Measurement of bending rigidity of molded product Cut a dry test piece from a knee 1L plate molded product, and perform AST
The measurement was based on MD-790. Measurement of tensile strength and elongation of molded product A dry test piece was cut from a knee flat molded product and tested according to JIS K-71.
It was measured in accordance with 13. Example 1 The following component system (A) and component system (B) were each prepared in a component system holding tank, and each was heated to 2 kg/cm2・f while stirring while maintaining the temperature at 90°C once every 7 times. It was sealed with nitrogen gas. Ingredient system (A) ε-caprolactam 46.9kg Sonium virolidone 0.7〃Nylon 1
2.5 #Component system (B) ε-caprolactam 26.9 kg Tele7 Lyroyl biscaprolactam 3,9 Polypropylene glyfur (molecular weight 2.000) 19.3 // Nylon I 1 , 471 Next, the component system ( A> and the component system (r3) were impact-mixed using a reaction injection molding machine, and injected into a sheet mold having a cavity of 500+nm in length and width and 3+am in depth and temperature-controlled at 140°C. The foamed molded product was obtained by holding for a minute. The physical property measurement results for this foamed molded product are shown in Table 1. Comparative Example 1 In the example described in Example 1, except that nylon I was not used. In the same manner as in the same example, the component system (A),
A component system (B) was prepared. A foam molded article was obtained from these two components by the same reaction injection molding method as in the same example. Table 1 shows the results of measuring the physical properties of this foam molded product. Example 2 The following component system (A) and component system (B) were each prepared in a component system holding tank, and each was heated with nitrogen gas at 2 kg/cI112·f while stirring while maintaining the temperature at 90°C. I sealed it. Component system (A) ε-caprolactam 40.1kg Bromomagnesium caprolactam 2.4〃Nylon l
2.1//Component system (B) ε-caprolactam 23.5 kg Polymerization promoter (X) 19.0//Nylon I
1.2//The polymerization promoter (X) added to the component system (I3) has the following formula (wherein, Z is a block copolymer of ethylene oxide and propylene oxide with a molecular weight of about 6,000. This is a compound represented by: Next, the above two components were treated in the same manner as described in Example 1 to obtain a foam molded product using a reaction injection molding machine. The results of measuring the physical properties of this foam molded product are shown in Table fjSi. Comparative Example 2 In the example described in Comparative Example 2, the component system (A),
A component system (B) was prepared. A foam molded article was obtained using these two components using the same reaction injection molding method as in the same example. Table 1 shows the results of measuring the physical properties of this foamed molded product in 1-1. Example 3 The following component system (A) and component system (B') were each prepared in a component system holding tank, and while maintaining each at a temperature of 90°C, nitrogen gas of 2 kg/can2. Component system (A) ε-caprolactam 33.0kg Bromomagnesium caprolactam 2.0 Nylon I
1.7/component system (B) ε-caprolactam 19.4 kg Polymerization cocatalyst (y) 15.6// Milled (a) l, 7 tt component system (
The polymerization cocatalyst (y) added to B> is a compound represented by the following formula (where Z represents polybutadiene with a molecular weight of about 6,000), and the milled glass (a) has a fiber diameter of 11 μm and a weight of Average fiber length 75μm, fiber length 25μm
Those with physical properties of less than 5% by weight and those with #&#I length of more than 300 μm of 7% by weight were surface treated with γ-7/propyltriethoxysilane. Table 1 shows the results of measuring the physical properties of a foamed molded product obtained by using a reaction injection molding machine in the same manner as described in Example 1. Comparative Example 3 The same procedure as in Example 3 was carried out except that nylon I was not used. The physical property measurement results for the obtained foam molded product were
It is shown in Table 1. Example 4 The example described in Example 3 was the same as in Example 3, except that instead of milled brass (a), lath fibers having the following properties were used. The physical property measurement results for the obtained foamed molded product are shown in Table 1. The glass fiber has a diameter in the range of 90 to 150 μm and a 7 major aspect ratio of 50. Comparative Example 4 The same procedure as in Example 4 was carried out except that nylon I was not used. The physical property measurement results for the obtained foam molded product were
Shown in Table J1. Example 5 In the example described in Example 2, nylon I is replaced by nylon ■
The component system (A
), component system (B) was prepared. A foamed injection molded article was obtained from these two components by the same reaction injection molding method as in the same example. The results of measuring the physical properties of this foam molded product are
It is shown in the tJIJ1 table. Example 6 In the example described in Example 3, Nylon I is replaced by Nylon H.
The component system (A
), and prepare component M(B). From these two ingredients,
A foamed injection molded article was obtained by the same reaction injection molding method as in the same example. The physical property measurement results for this foam molded product are
Shown in Table 1. Example 7 In the example described in Example 2, the pressure of the nitrogen gas sealed in each component tank was set to 0.8 kHz/can2・r.
Other than that, it was the same as in the same example. Table 1 shows the results of measuring the physical properties of the foamed molded product obtained. Comparative Example 5 The same procedure as in Example 7 was carried out except that nylon (■) was not used. Table 1 shows the results of measuring the physical properties of the foamed molded product obtained. Example 8 In the example described in Example 3, the same procedure as in Example 3 was performed except that the pressure of the nitrogen gas that sealed each component system tank was 0.8 kg/cIfi2·f. Table 1 shows the results of measuring the physical properties of the foamed molded product obtained. Comparative Example 6 In the example described in Example 8, the same procedure as in the same example was made except that nylon l was not used. The physical property measurement results for the obtained foam molded product were
It is shown in Table 1. Example 9 The example described in Example 2 was the same as in Example 2, except that the pressure of the nitrogen gas that sealed each component tank was 5 kg/cm2·f. The physical property measurement results for the obtained foamed molded product are shown in Table fjS1. Comparative Example 7 In the example described in Example 9, the same procedure as in the same example was made except that nylon I was not used. Table 1 shows the results of measuring the physical properties of the foamed molded product obtained. Example 10 The same procedure as in Example 3 was performed except that the pressure of the nitrogen gas that sealed each component tank was 5 kg/eta2·r. Table 1 shows the results of measuring the physical properties of the foamed molded product obtained. Comparative Example 8 The same procedure as in Example 10 was carried out except that nylon I was not used. Table 1 shows the results of measuring the physical properties of the foamed molded product obtained. From Table 1, it can be seen that the amide resin foam molded product obtained by the method of the present invention, compared to the foam molded product obtained by the method of the comparative example,
It is clear that the appearance of the molded product is excellent, and its tensile strength, elongation, etc. are also excellent.

Claims (8)

[Claims] (1) When producing amide resin foam molded products, at least one of the omega-lactam melt containing a polymerization catalyst and the omega-lactam melt containing a polymerization co-catalyst is added to the omega-lactam melt. A method for producing an amide-based resin foam molded article, which comprises blending a molten polyamide and injecting or injecting the mixture into a mold to form a molded article. (2) Polyamides soluble in a melt of omega-lactam are composed of the following four monomer groups constituting the polyamides: (a) dicarboxylic acids, (b) diamic acids, (c) aminocarboxylic acids. Claim (1), characterized in that it is a copolymer composed of at least three types of monomer components selected from the group of at least three types of acids and (d) lactams. The method for producing the amide resin foam molded product described above. (3) The blending amount of polyamides soluble in the omega-lactam melt is 0.1 to 3 parts per 100 parts by weight of the total raw material composition.
A method for producing an amide-based resin foam molded article according to claims (1) to (2), characterized in that the content is in the range of 0 parts by weight. (4) The omega-lactam melt containing a polymerization cocatalyst has the following properties:
A method for producing an amide resin foam molded article according to claims (1) to (3), which comprises blending a crosslinking agent or a reaction product modifier. (5) An amide system according to claims (1) to (3), characterized in that an inert gas is dissolved or dispersed in the raw material composition, or a low boiling point organic compound is dissolved in the raw material composition. Method for manufacturing resin foam molded products. (6) The porosity of the amide resin foam molded product is 0.1 to 9.
A method for producing an amide resin foam molded article according to claims (1) to (5), characterized in that the content is in the range of 0%. (7) Amide-based resin foaming according to claims (1) to (5), characterized in that fillers such as glass fibers, glass flakes, and glass beads are blended into the raw material composition. Method of manufacturing molded products. (8) Amide resin foaming according to claim (7), characterized in that the blending amount of the filler is in the range of 1 to 50 parts by weight per 100 parts by weight of the total amount of the raw material composition. Method of manufacturing molded products.