Environmentally friendly polymer nylon modified flame retardant plastic and preparation method thereof

Abstract

The invention discloses a kind of environment-friendly polymer nylon modified flame retardant plastic and preparation method thereof, relate to the field of plastic technology.The present invention uses nylon 66, branched nylon 6, ABS resin, flame retardant modified hydrotalcite, plasticizer, and the environment-friendly polymer nylon modified flame retardant plastic of preparation is excellent in flame retardancy.The present invention uses 3-aminophthalic acid radical to carry out intercalation treatment on hydrotalcite, improves the interlayer distance of hydrotalcite, improves the dispersibility of hydrotalcite, simultaneously makes the specific surface area of ​​hydrotalcite increase, has more active sites to react with tannic acid, makes more iron ions chelate, further improves the flame retardancy of polymer nylon modified flame retardant plastic.The present invention uses tannic acid to further modify intercalation hydrotalcite, then utilizes the chelating property of tannic acid to chelate iron ions, plays the effect of catalytic carbonization, strengthens the flame retardancy of polymer nylon modified flame retardant plastic.

Description

Technical Field

[0001] The present invention relates to the technical field of plastics, in particular to an environmentally friendly high-molecular nylon modified flame-retardant plastic and a preparation method thereof. Background Art

[0002] With the rapid development of industry and consumer goods, plastic materials are increasingly being used in various fields, especially in the automotive, electronics, and construction industries. Nylon is a polyamide polymer material. As an excellent engineering plastic, it occupies an important position in modern industry due to its excellent properties such as high temperature resistance, wear resistance, and high mechanical strength. However, the flammability of nylon materials and the harmful gases released when exposed to fire pose a potential threat to human health and the environment. Therefore, it cannot meet safety standards in some demanding applications. Although the use of traditional flame retardants such as bromine-based, chlorine-based, and phosphorus-based flame retardants can effectively improve the flame retardant properties of plastics, they release toxic gases during combustion, polluting the environment and endangering human health. Therefore, the development of an environmentally friendly flame-retardant nylon modified plastic to provide a safer and more environmentally friendly material option for the industrial and consumer markets has become a hot topic in materials science research.

[0003] In order to solve the above problems and improve the flame retardant properties of plastics, the present invention provides an environmentally friendly polymer nylon modified flame retardant plastic and a preparation method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide an environmentally friendly high-molecular nylon modified flame-retardant plastic and a preparation method thereof, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic comprises the following steps:

[0007] Step 1: Take ferric nitrate and deionized water, stir evenly to obtain ferric nitrate solution; take modified hydrotalcite and deionized water, stir evenly, add ferric nitrate solution dropwise, react for 3-4 hours, filter, wash and grind to obtain flame retardant modified hydrotalcite;

[0008] Step 2: Take nylon 66, branched nylon 6, ABS resin, flame retardant modified hydrotalcite, and plasticizer, stir them evenly, melt extrude, and granulate to obtain environmentally friendly polymer nylon modified flame retardant plastic.

[0009] More optimally, the preparation method of the modified hydrotalcite is: take cyanuric chloride and acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take intercalated hydrotalcite, tannic acid, and acetonitrile, ultrasonically disperse, heat to 65-70°C, stir for 30-40 minutes, add the cyanuric chloride mixed solution, stir evenly, add triethylamine, heat to 85-90°C, react for 7-9 hours, filter, wash, and grind to obtain the modified hydrotalcite.

[0010] More optimally, the preparation method of the intercalated hydrotalcite is: take sodium hydroxide, 3-aminophthalate, and deionized water, stir evenly to obtain a mixed solution; take aluminum chloride, magnesium chloride, and deionized water, stir evenly, add the mixed solution dropwise, stir for 60-90 minutes, age at 60-65°C for 24-26 hours, wash, filter, dry, and grind to obtain the intercalated hydrotalcite.

[0011] More optimally, the environmentally friendly polymer nylon modified flame retardant plastic comprises the following components, by weight: 90-100 parts of nylon 66, 24-34 parts of branched nylon 6, 28-32 parts of ABS resin, 24-30 parts of flame retardant modified hydrotalcite, and 2-3 parts of plasticizer.

[0012] More optimally, the mass ratio of the ferric nitrate to the modified hydrotalcite is (1.4-1.6):3.

[0013] More optimally, the preparation method of the branched nylon 6 is: take tris (3-aminophenyl) phosphine oxide, isophthaloyl chloride, and N, N-dimethylacetamide, stir evenly, heat to 50-55 ° C. to react for 2-2.5 hours, filter, wash, and dry to obtain compound A; take compound A and nylon 6, stir for 10-15 minutes to obtain branched nylon 6.

[0014] More optimally, the plasticizer is N-(2-hydroxypropyl)benzenesulfonamide.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention prepares a branched nylon 6 containing amino groups, which enhances the mechanical properties of the branched nylon 6. The environmentally friendly polymer nylon modified flame retardant plastic with excellent flame retardant properties is prepared using nylon 66, branched nylon 6, ABS resin, flame retardant modified hydrotalcite, and plasticizer.

[0017] (2) Hydrotalcite is a halogen-free, environmentally friendly flame retardant that is environmentally friendly, non-toxic, and smoke-suppressing. The present invention uses 3-aminophthalate to intercalate the hydrotalcite, increasing the interlayer spacing and dispersibility of the hydrotalcite. It also increases the specific surface area of ​​the hydrotalcite, providing more active sites for reaction with tannic acid and allowing for chelation of more iron ions, further improving the flame retardant properties of the polymer nylon modified flame retardant plastic.

[0018] The intercalated hydrotalcite prepared by the invention has amino groups and has good compatibility with amino-branched nylon 6, thereby improving the dispersibility of the flame-retardant modified hydrotalcite and thus improving the flame-retardant performance of the polymer nylon modified flame-retardant plastic.

[0019] (3) Tannic acid is a green and environmentally friendly biopolyphenol macromolecular substance with excellent carbonization effect. The present invention uses tannic acid to further modify the intercalated hydrotalcite, and then uses the chelating property of tannic acid to chelate iron ions, which has a catalytic carbonization effect and enhances the flame retardant properties of the polymer nylon modified flame retardant plastic. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] The sources and models of the materials involved in the present invention are not particularly limited, and illustratively include: nylon 66: model: A3HG5, which can be purchased from BASF of Germany; nylon 6: model: CM1017, which can be purchased from Toray Industries, Ltd. of Japan; ABS resin: model: PA-757, which can be purchased from Chi Mei Industrial Co., Ltd. of China.

[0022] Example 1: A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic, comprising the following steps:

[0023] Step 1: Preparation of intercalated hydrotalcite:

[0024] Take 3.4 g of sodium hydroxide, 3.2 g of 3-aminophthalate, and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 80 minutes, age at 62°C for 25 hours, wash, filter, dry, and grind to obtain intercalated hydrotalcite;

[0025] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0026] S1: Take 0.5g of cyanuric chloride and 30mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take 3g of intercalated hydrotalcite, 1.4g of tannic acid, and 200mL of acetonitrile, ultrasonically disperse, heat to 68°C, stir for 35min, add the cyanuric chloride mixed solution, stir evenly, add 7mL of triethylamine, heat to 88°C, react for 8h, filter, wash, and grind to obtain modified hydrotalcite;

[0027] S2: Take 1.5g of ferric nitrate and 50mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3g of modified hydrotalcite and 100mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 3.5h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0028] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1.5:3;

[0029] Step 3: Preparation of branched nylon 6:

[0030] Take 3g of tris(3-aminophenyl)phosphine oxide, 1.2g of isophthaloyl chloride, and 100mL of N,N-dimethylacetamide, stir evenly, heat to 53°C and react for 2.3h, filter, wash, and dry to obtain compound A; take 1g of compound A and 100g of nylon 6, stir for 12min to obtain branched nylon 6;

[0031] Step 4: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0032] Nylon 66, branched nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0033] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 95 parts of nylon 66, 28 parts of branched nylon 6, 30 parts of ABS resin, 28 parts of flame-retardant modified hydrotalcite, and 2.5 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0034] Example 2: A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic, comprising the following steps:

[0035] Step 1: Preparation of intercalated hydrotalcite:

[0036] Take 3.4 g of sodium hydroxide, 3.2 g of 3-aminophthalate, and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 60 minutes, age at 60°C for 24 hours, wash, filter, dry, and grind to obtain intercalated hydrotalcite;

[0037] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0038] S1: Take 0.5g of cyanuric chloride and 30mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take 3g of intercalated hydrotalcite, 1.4g of tannic acid, and 200mL of acetonitrile, ultrasonically disperse, heat to 65℃, stir for 30min, add the cyanuric chloride mixed solution, stir evenly, add 7mL of triethylamine, heat to 85℃, react for 7h, filter, wash, and grind to obtain modified hydrotalcite;

[0039] S2: Take 1.4 g of ferric nitrate and 50 mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3 g of modified hydrotalcite and 100 mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 3 h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0040] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1.4:3;

[0041] Step 3: Preparation of branched nylon 6:

[0042] Take 3g of tris(3-aminophenyl)phosphine oxide, 1.2g of isophthaloyl chloride, and 100mL of N,N-dimethylacetamide, stir evenly, heat to 50°C and react for 2h, filter, wash, and dry to obtain compound A; take 1g of compound A and 100g of nylon 6, stir for 10min to obtain branched nylon 6;

[0043] Step 4: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0044] Nylon 66, branched nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0045] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 90 parts of nylon 66, 24 parts of branched nylon 6, 28 parts of ABS resin, 24 parts of flame-retardant modified hydrotalcite, and 2 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0046] Example 3: A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic, comprising the following steps:

[0047] Step 1: Preparation of intercalated hydrotalcite:

[0048] Take 3.4 g of sodium hydroxide, 3.2 g of 3-aminophthalate, and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 90 minutes, age at 65°C for 26 hours, wash, filter, dry, and grind to obtain intercalated hydrotalcite;

[0049] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0050] S1: Take 0.5g of cyanuric chloride and 30mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take 3g of intercalated hydrotalcite, 1.4g of tannic acid, and 200mL of acetonitrile, ultrasonically disperse, heat to 70℃, stir for 40min, add the cyanuric chloride mixed solution, stir evenly, add 7mL of triethylamine, heat to 90℃, react for 9h, filter, wash, and grind to obtain modified hydrotalcite;

[0051] S2: Take 1.4 g of ferric nitrate and 50 mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3 g of modified hydrotalcite and 100 mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 4 h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0052] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1.4:3;

[0053] Step 3: Preparation of branched nylon 6:

[0054] Take 3g of tris(3-aminophenyl)phosphine oxide, 1.2g of isophthaloyl chloride, and 100mL of N,N-dimethylacetamide, stir evenly, heat to 55°C and react for 2.5h, filter, wash, and dry to obtain compound A; take 1g of compound A and 100g of nylon 6, stir for 15min to obtain branched nylon 6;

[0055] Step 4: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0056] Nylon 66, branched nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0057] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 100 parts of nylon 66, 34 parts of branched nylon 6, 32 parts of ABS resin, 30 parts of flame-retardant modified hydrotalcite, and 3 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0058] Comparative Example 1: Nylon 6 was not subjected to branching treatment, and the rest was the same as in Example 1:

[0059] A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic comprises the following steps:

[0060] Step 1: Preparation of intercalated hydrotalcite:

[0061] Take 3.4 g of sodium hydroxide, 3.2 g of 3-aminophthalate, and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 80 minutes, age at 62°C for 25 hours, wash, filter, dry, and grind to obtain intercalated hydrotalcite;

[0062] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0063] S1: Take 0.5g of cyanuric chloride and 30mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take 3g of intercalated hydrotalcite, 1.4g of tannic acid, and 200mL of acetonitrile, ultrasonically disperse, heat to 68°C, stir for 35min, add the cyanuric chloride mixed solution, stir evenly, add 7mL of triethylamine, heat to 88°C, react for 8h, filter, wash, and grind to obtain modified hydrotalcite;

[0064] S2: Take 1.5g of ferric nitrate and 50mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3g of modified hydrotalcite and 100mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 3.5h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0065] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1.5:3;

[0066] Step 3: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0067] Nylon 66, nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0068] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 95 parts of nylon 66, 28 parts of nylon 6, 30 parts of ABS resin, 28 parts of flame-retardant modified hydrotalcite, and 2.5 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0069] Comparative Example 2: No 3-aminophthalate was used for modification, and the rest was the same as in Example 1:

[0070] A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic comprises the following steps:

[0071] Step 1: Preparation of hydrotalcite:

[0072] Take 3.4 g of sodium hydroxide and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 80 minutes, age at 62°C for 25 hours, wash, filter, dry, and grind to obtain hydrotalcite;

[0073] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0074] S1: Take 0.5 g of cyanuric chloride and 30 mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixture; take 3 g of hydrotalcite, 1.4 g of tannic acid, and 200 mL of acetonitrile, ultrasonically disperse, heat to 68°C, stir for 35 minutes, add the cyanuric chloride mixture, stir evenly, add 7 mL of triethylamine, heat to 88°C, react for 8 hours, filter, wash, and grind to obtain modified hydrotalcite;

[0075] S2: Take 1.5g of ferric nitrate and 50mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3g of modified hydrotalcite and 100mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 3.5h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0076] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1.5:3;

[0077] Step 3: Preparation of branched nylon 6:

[0078] Take 3g of tris(3-aminophenyl)phosphine oxide, 1.2g of isophthaloyl chloride, and 100mL of N,N-dimethylacetamide, stir evenly, heat to 53°C and react for 2.3h, filter, wash, and dry to obtain compound A; take 1g of compound A and 100g of nylon 6, stir for 12min to obtain branched nylon 6;

[0079] Step 4: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0080] Nylon 66, branched nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0081] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 95 parts of nylon 66, 28 parts of branched nylon 6, 30 parts of ABS resin, 28 parts of flame-retardant modified hydrotalcite, and 2.5 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0082] Comparative Example 3: Tannic acid was not used to modify the intercalated hydrotalcite, and the rest was the same as in Example 1:

[0083] A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic comprises the following steps:

[0084] Step 1: Preparation of intercalated hydrotalcite:

[0085] Take 3.4 g of sodium hydroxide, 3.2 g of 3-aminophthalate, and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 80 minutes, age at 62°C for 25 hours, wash, filter, dry, and grind to obtain intercalated hydrotalcite;

[0086] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0087] S1: Take 0.5g of cyanuric chloride and 30mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take 3g of intercalated hydrotalcite and 200mL of acetonitrile, ultrasonically disperse, heat to 68℃, stir for 35min, add the cyanuric chloride mixed solution, stir evenly, add 7mL of triethylamine, heat to 88℃, react for 8h, filter, wash, and grind to obtain modified hydrotalcite;

[0088] S2: Take 1.5g of ferric nitrate and 50mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3g of modified hydrotalcite and 100mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 3.5h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0089] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1.5:3;

[0090] Step 3: Preparation of branched nylon 6:

[0091] Take 3g of tris(3-aminophenyl)phosphine oxide, 1.2g of isophthaloyl chloride, and 100mL of N,N-dimethylacetamide, stir evenly, heat to 53°C and react for 2.3h, filter, wash, and dry to obtain compound A; take 1g of compound A and 100g of nylon 6, stir for 12min to obtain branched nylon 6;

[0092] Step 4: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0093] Nylon 66, branched nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0094] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 95 parts of nylon 66, 28 parts of branched nylon 6, 30 parts of ABS resin, 28 parts of flame-retardant modified hydrotalcite, and 2.5 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0095] Comparative Example 4: The mass ratio of ferric nitrate to modified hydrotalcite is 1:3, and the rest is the same as Example 1:

[0096] A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic comprises the following steps:

[0097] Step 1: Preparation of intercalated hydrotalcite:

[0098] Take 3.4 g of sodium hydroxide, 3.2 g of 3-aminophthalate, and 60 mL of deionized water, stir evenly to obtain a mixed solution; take 2.4 g of aluminum chloride, 4 g of magnesium chloride, and 100 mL of deionized water, stir evenly, add the mixed solution dropwise, stir for 80 minutes, age at 62°C for 25 hours, wash, filter, dry, and grind to obtain intercalated hydrotalcite;

[0099] Step 2: Preparation of flame retardant modified hydrotalcite, comprising the following steps:

[0100] S1: Take 0.5g of cyanuric chloride and 30mL of acetonitrile, stir evenly to obtain a cyanuric chloride mixed solution; take 3g of intercalated hydrotalcite, 1.4g of tannic acid, and 200mL of acetonitrile, ultrasonically disperse, heat to 68°C, stir for 35min, add the cyanuric chloride mixed solution, stir evenly, add 7mL of triethylamine, heat to 88°C, react for 8h, filter, wash, and grind to obtain modified hydrotalcite;

[0101] S2: Take 1g of ferric nitrate and 50mL of deionized water, stir evenly to obtain a ferric nitrate solution; 3g of modified hydrotalcite and 100mL of deionized water, stir evenly, add the ferric nitrate solution dropwise, react for 3.5h, filter, wash, and grind to obtain a flame-retardant modified hydrotalcite;

[0102] The mass ratio of the ferric nitrate to the modified hydrotalcite is 1:3;

[0103] Step 3: Preparation of branched nylon 6:

[0104] Take 3g of tris(3-aminophenyl)phosphine oxide, 1.2g of isophthaloyl chloride, and 100mL of N,N-dimethylacetamide, stir evenly, heat to 53°C, react for 2.3h, filter, wash, and dry to obtain compound A; take 1g of compound A and 100g of nylon 6, stir for 12min to obtain branched nylon 6;

[0105] Step 4: Preparation of environmentally friendly polymer nylon modified flame retardant plastic:

[0106] Nylon 66, branched nylon 6, ABS resin, flame-retardant modified hydrotalcite, and plasticizer N-(2-hydroxypropyl)benzenesulfonamide are mixed evenly, melt-extruded, and granulated to obtain an environmentally friendly polymer nylon modified flame-retardant plastic.

[0107] The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 95 parts of nylon 66, 28 parts of branched nylon 6, 30 parts of ABS resin, 28 parts of flame-retardant modified hydrotalcite, and 2.5 parts of plasticizer N-(2-hydroxypropyl)benzenesulfonamide.

[0108] experiment:

[0109] The environmentally friendly polymer nylon modified flame retardant plastics prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to performance testing. The nylon modified flame retardant plastics were cut into 160 mm × 10 mm × 3 mm specimens to test their tensile strength; and their limiting oxygen index was tested to characterize their flame retardant properties. The data obtained are shown in the following table:

[0110] Tensile strength / MPa LOI / % Example 1 135 31.8 Example 2 134 31.6 Example 3 135 31.9 Comparative Example 1 123 30.9 Comparative Example 2 122 30.7 Comparative Example 3 127 28.4 Comparative Example 4 129 29.2

[0111] Conclusion: From the comparison of the data in the table, it can be seen that in Comparative Example 1, nylon 6 is not subjected to branching treatment, and the flame retardant properties of the environmentally friendly polymer nylon modified flame retardant plastic deteriorate, and the mechanical properties deteriorate. In Comparative Example 2, 3-aminophthalate is not used to intercalate the hydrotalcite, and the dispersibility of the hydrotalcite is poor, the specific surface area is small, the chelated iron ions are reduced, and the flame retardant properties of the polymer nylon modified flame retardant plastic deteriorate, and the mechanical properties deteriorate. In Comparative Example 3, tannic acid is not used to modify the intercalated hydrotalcite, and the flame retardant properties of the polymer nylon modified flame retardant plastic deteriorate. In Comparative Example 4, the mass ratio of ferric nitrate to modified hydrotalcite is 1:3, the ferric nitrate content is reduced, and the flame retardant properties of the polymer nylon modified flame retardant plastic deteriorate. Examples 1 to 3 of the present invention prepare a branched nylon 6 containing amino groups, which enhances the mechanical properties of branched nylon 6. The present invention uses 3-aminophthalate to intercalate the hydrotalcite, thereby increasing the interlayer spacing of the hydrotalcite and improving the dispersibility of the hydrotalcite. At the same time, the specific surface area of ​​the hydrotalcite is increased, and more active sites can react with tannic acid, so that more iron ions can be chelated, further improving the flame retardant properties of the polymer nylon modified flame retardant plastic. The intercalated hydrotalcite prepared by the present invention has amino groups and can have good compatibility with amino-branched nylon 6, thereby improving the dispersibility of the flame retardant modified hydrotalcite and thus improving the flame retardant properties of the polymer nylon modified flame retardant plastic. Examples 1 to 3 of the present invention use tannic acid to further modify the intercalated hydrotalcite, and then utilize the chelating property of the tannic acid to chelate the iron ions, thereby achieving a catalytic carbonization effect and enhancing the flame retardant properties of the polymer nylon modified flame retardant plastic.

[0112] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A method for preparing an environmentally friendly polymer nylon modified flame retardant plastic, characterized by: The following steps are involved: Step 1: Take ferric nitrate and deionized water, stir evenly to obtain ferric nitrate solution; take modified hydrotalcite and deionized water, stir evenly, add ferric nitrate solution dropwise, react for 3-4 hours, filter, wash and grind to obtain flame retardant modified hydrotalcite; Step 2: taking nylon 66, branched nylon 6, ABS resin, flame retardant modified hydrotalcite, and plasticizer, stirring evenly, melt-extruding, and granulating to obtain an environmentally friendly polymer nylon modified flame retardant plastic; The preparation method of the modified hydrotalcite comprises: taking cyanuric chloride and acetonitrile, stirring evenly to obtain a cyanuric chloride mixed solution; taking intercalated hydrotalcite, tannic acid, and acetonitrile, ultrasonically dispersing, heating to 65-70° C., stirring for 30-40 minutes, adding the cyanuric chloride mixed solution, stirring evenly, adding triethylamine, heating to 85-90° C., reacting for 7-9 hours, filtering, washing, and grinding to obtain the modified hydrotalcite; The preparation method of the intercalated hydrotalcite comprises: taking sodium hydroxide, 3-aminophthalate and deionized water, stirring evenly to obtain a mixed solution; taking aluminum chloride, magnesium chloride and deionized water, stirring evenly, adding the mixed solution dropwise, stirring for 60-90 minutes, aging at 60-65° C. for 24-26 hours, washing, filtering, drying and grinding to obtain the intercalated hydrotalcite.

2. The method for preparing an environmentally friendly polymer nylon modified flame retardant plastic according to claim 1, characterized in that: The environmentally friendly high-molecular nylon modified flame-retardant plastic comprises the following components, by weight: 90-100 parts of nylon 66, 24-34 parts of branched nylon 6, 28-32 parts of ABS resin, 24-30 parts of flame-retardant modified hydrotalcite, and 2-3 parts of plasticizer.

3. The method for preparing an environmentally friendly polymer nylon modified flame retardant plastic according to claim 1, characterized in that: The mass ratio of the ferric nitrate to the modified hydrotalcite is (1.4-1.6):

3.

4. The method for preparing an environmentally friendly polymer nylon modified flame retardant plastic according to claim 2, characterized in that: The preparation method of the branched nylon 6 is as follows: taking tris(3-aminophenyl)phosphine oxide, isophthaloyl chloride, and N,N-dimethylacetamide, stirring evenly, heating to 50-55° C. and reacting for 2-2.5 hours, filtering, washing, and drying to obtain compound A; taking compound A and nylon 6, stirring for 10-15 minutes to obtain branched nylon 6.

5. The method for preparing an environmentally friendly polymer nylon modified flame retardant plastic according to claim 2, characterized in that: The plasticizer is N-(2-hydroxypropyl)benzenesulfonamide.

6. An environmentally friendly polymer nylon modified flame retardant plastic prepared according to the method for preparing an environmentally friendly polymer nylon modified flame retardant plastic according to any one of claims 1 to 5.