A kind of polyamide barrier material and preparation method thereof

Abstract

The invention discloses a polyamide barrier material, which is made of the following components in parts by weight: 670-948 parts of caprolactam, 1-10 parts of catalyst, 1-10 parts of activator, 50-150 parts of polyvinyl alcohol, Polyamide 66 0-150 parts, other additives 0-10 parts. The invention also discloses a preparation method of the polyamide barrier material. The polyamide barrier material of the present invention has the characteristics of high barrier property and high toughness, and other mechanical properties are relatively excellent, and the cost of raw materials is low. It has very broad application prospects.

Description

technical field

[0001] The invention relates to the technical field of polymer materials, in particular to a polyamide barrier material and a preparation method thereof. Background technique

[0002] Polyamide, commonly known as nylon, is an engineering plastic with excellent performance. It has good wear resistance, plasticity and mechanical properties. It is widely used in construction, machinery, automobiles, electronics, home appliances and other fields. Polyamide contains strong polar amide groups, which have better barrier properties to gases and non-polar liquids, but poor barrier properties to polar small molecules such as water molecules. On this basis, researchers at home and abroad have carried out various chemical and physical modifications on polyamides to improve their barrier properties.

[0003] Chinese patent CN1117123C uses polyethylene, polypropylene to modify nylon 1212 to prepare barrier materials; 66 and other materials are mechanically blended and to...

Examples

Embodiment 1

[0042] (a) caprolactam dissolving polyamide 66, polyvinyl alcohol stage

[0043] Heat 795 parts by weight of caprolactam to 160°C, under the protection of nitrogen gas, add 100 parts by weight of polyamide 66, stir for 90 minutes, then add 100 parts by weight of polyvinyl alcohol, and stir for 45 minutes.

[0044] (b) Water removal stage

[0045] Turn on the vacuum pump, and vacuumize for 20 minutes at 150°C.

[0046] (c) Casting stage

[0047] Add 2 parts by weight of sodium hydroxide and 3 parts by weight of toluene diisocyanate into the above mixture, mix quickly and uniformly, pour into a mold for casting; the casting temperature is 160° C., and react for 15 minutes. The obtained polyamide barrier material was subjected to a performance test, and the specific performance test results are shown in Table 1.

Embodiment 2

[0049] (a) Caprolactam dissolving polyvinyl alcohol stage

[0050] Heat 948 parts by weight of caprolactam to 160°C, add 50 parts by weight of polyvinyl alcohol under the protection of carbon dioxide gas, and stir for 10 minutes.

[0051] (b) Water removal stage

[0052] Turn on the vacuum pump, and vacuumize for 10 minutes at 140°C.

[0053] (c) Casting stage

[0054] Add 1 part by weight of sodium cyanide and 1 part by weight of toluene diisocyanate to the above mixture, mix quickly and uniformly, pour into a mold for casting; casting temperature is 180°C, and react for 5 minutes. The obtained polyamide barrier material was subjected to a performance test, and the specific performance test results are shown in Table 1.

Embodiment 3

[0056] (a) caprolactam dissolving polyamide 66, polyvinyl alcohol stage

[0057] Heat 670 parts by weight of caprolactam to 180°C, under the protection of nitrogen gas, add 150 parts by weight of polyamide 66, stir for 120 minutes, then add 150 parts by weight of polyvinyl alcohol, and stir for 40 minutes.

[0058] (b) Water removal stage

[0059] Turn on the vacuum pump, and vacuumize for 30 minutes at 160°C.

[0060] (c) Casting stage

[0061] Add 10 parts by weight of sodium caprolactam, 10 parts by weight of triphenylmethane triisocyanate, 2 parts by weight of antioxidant 1010, 3 parts by weight of antioxidant 168, and 5 parts by weight of light stabilizer 442 into the above mixture, mix quickly and uniformly, Pour into a mold for casting; the casting temperature is 180°C, and the reaction takes 5 minutes. The obtained polyamide barrier material was subjected to a performance test, and the specific performance test results are shown in Table 1.

technical field

[0001] The invention relates to the technical field of polymer materials, in particular to a polyamide barrier material and a preparation method thereof. Background technique

[0002] Polyamide, commonly known as nylon, is an engineering plastic with excellent performance. It has good wear resistance, plasticity and mechanical properties. It is widely used in construction, machinery, automobiles, electronics, home appliances and other fields. Polyamide contains strong polar amide groups, which have better barrier properties to gases and non-polar liquids, but poor barrier properties to polar small molecules such as water molecules. On this basis, researchers at home and abroad have carried out various chemical and physical modifications on polyamides to improve their barrier properties.

[0003] Chinese patent CN1117123C uses polyethylene, polypropylene to modify nylon 1212 to prepare barrier materials; 66 and other materials are mechanically blended and to...

Examples

Embodiment 1

[0042] (a) caprolactam dissolving polyamide 66, polyvinyl alcohol stage

[0043] Heat 795 parts by weight of caprolactam to 160°C, under the protection of nitrogen gas, add 100 parts by weight of polyamide 66, stir for 90 minutes, then add 100 parts by weight of polyvinyl alcohol, and stir for 45 minutes.

[0044] (b) Water removal stage

[0045] Turn on the vacuum pump, and vacuumize for 20 minutes at 150°C.

[0046] (c) Casting stage

[0047] Add 2 parts by weight of sodium hydroxide and 3 parts by weight of toluene diisocyanate into the above mixture, mix quickly and uniformly, pour into a mold for casting; the casting temperature is 160° C., and react for 15 minutes. The obtained polyamide barrier material was subjected to a performance test, and the specific performance test results are shown in Table 1.

Embodiment 2

[0049] (a) Caprolactam dissolving polyvinyl alcohol stage

[0050] Heat 948 parts by weight of caprolactam to 160°C, add 50 parts by weight of polyvinyl alcohol under the protection of carbon dioxide gas, and stir for 10 minutes.

[0051] (b) Water removal stage

[0052] Turn on the vacuum pump, and vacuumize for 10 minutes at 140°C.

[0053] (c) Casting stage

[0054] Add 1 part by weight of sodium cyanide and 1 part by weight of toluene diisocyanate to the above mixture, mix quickly and uniformly, pour into a mold for casting; casting temperature is 180°C, and react for 5 minutes. The obtained polyamide barrier material was subjected to a performance test, and the specific performance test results are shown in Table 1.

Embodiment 3

[0056] (a) caprolactam dissolving polyamide 66, polyvinyl alcohol stage

[0057] Heat 670 parts by weight of caprolactam to 180°C, under the protection of nitrogen gas, add 150 parts by weight of polyamide 66, stir for 120 minutes, then add 150 parts by weight of polyvinyl alcohol, and stir for 40 minutes.

[0058] (b) Water removal stage

[0059] Turn on the vacuum pump, and vacuumize for 30 minutes at 160°C.

[0060] (c) Casting stage

[0061] Add 10 parts by weight of sodium caprolactam, 10 parts by weight of triphenylmethane triisocyanate, 2 parts by weight of antioxidant 1010, 3 parts by weight of antioxidant 168, and 5 parts by weight of light stabilizer 442 into the above mixture, mix quickly and uniformly, Pour into a mold for casting; the casting temperature is 180°C, and the reaction takes 5 minutes. The obtained polyamide barrier material was subjected to a performance test, and the specific performance test results are shown in Table 1.

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