Flame-retardant polyurethane and preparation method thereof

Abstract

The invention provides flame-retardant polyurethane and a preparation method thereof, and belongs to the technical field of new material preparation. The flame-retardant polyurethane comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 40-60 parts of hydroxyl-terminated polybutadiene, 10-30 parts of polymer polyol, 10-30 parts of polypropylene glycol, 5-10 parts of a cross-linking agent and 5-10 parts of a flame retardant; the component B is isocyanate; the component A and the component B in the polyurethane are mixed according to the weight ratio of (1.4-1.6): 1. The DOPO and the HTPB are added at the same time, the good mechanical property and flame retardant property can be guaranteed, the requirements for equipment and the environment are low, the technology is simple, operation is convenient, and economical efficiency is good.

Description

technical field

[0001] The invention belongs to the technical field of new materials, and relates to a flame-retardant polyurethane and a preparation method thereof. Background technique

[0002] Polyurethane (PU) is a block polymer formed by the reaction of diisocyanate or polyisocyanate (hard segment) and polyol (soft segment) with more than 2 hydroxyl groups. The PU main chain contains many carbamate groups, so a large number of hydrogen bonds can be formed in the molecule and between the molecules, so that physical cross-linking occurs in the molecular chain. Due to the thermodynamic incompatibility of the cross-linked soft and hard phases, it makes The aggregation of hard segments and soft segments leads to microphase separation, that is, the uniform cross distribution of soft and hard segments acts as an elastic crosslinking effect, which makes polyurethane have excellent mechanical properties and various characteristics such as insulation, oil resistance, hydrolysis r...

Examples

Embodiment 1

[0032] (1) Preparation of component A

[0033] In parts by weight, 50 parts of hydroxyl-terminated polybutadiene, 10 parts of polycaprolactone diol, 30 parts of polypropylene glycol, 10 parts of trimethylolpropane, 5 parts of 9,10-dihydro-9-oxygen Hetero-10-phosphaphenanthrene-10-oxide was stirred at 1000 rpm and vacuum at 120°C for 3 hours, mixed evenly and cooled to 50°C to obtain the component A.

[0034] (2) Take 56 parts of component A and 40 parts of component B (4,4'-diphenylmethane diisocyanate) in the same container, and stir at room temperature for 5 minutes until the mixture is uniform to obtain a solvent-free two-component polyurethane.

Embodiment 2

[0036] (1) Preparation of component A

[0037] In parts by weight, 60 parts of hydroxyl-terminated polybutadiene, 10 parts of polycaprolactone triol, 10 parts of polypropylene glycol, 5 parts of trimethylolethane, 10 parts of 9,10-dihydro-9- Oxa-10-phosphaphenanthrene-10-oxide, stirred at 1500 rpm and vacuum at 100°C for 3 hours, mixed uniformly and cooled to 70°C to obtain the component A.

[0038] (2) Take 60 parts of component A and 40 parts of component B (toluene diisocyanate) in the same container, stir at room temperature for 6 minutes until they are evenly mixed to obtain a solvent-free two-component polyurethane.

Embodiment 3

[0040] (1) Preparation of component A

[0041] In parts by weight, 40 parts of hydroxyl-terminated polybutadiene, 25 parts of polycaprolactone diol, 25 parts of polypropylene glycol, 10 parts of trimethylolpropane, 10 parts of 9,10-dihydro-9-oxygen Hetero-10-phosphaphenanthrene-10-oxide was stirred at 1600 rpm and vacuum at 110°C for 2.5 hours, mixed evenly and cooled to 50°C to obtain the component A.

[0042] (2) Take 60 parts of component A and 40 parts of component B (toluene diisocyanate) in the same container, stir at room temperature for 8 minutes until they are evenly mixed to obtain a solvent-free two-component polyurethane.

technical field

[0001] The invention belongs to the technical field of new materials, and relates to a flame-retardant polyurethane and a preparation method thereof. Background technique

[0002] Polyurethane (PU) is a block polymer formed by the reaction of diisocyanate or polyisocyanate (hard segment) and polyol (soft segment) with more than 2 hydroxyl groups. The PU main chain contains many carbamate groups, so a large number of hydrogen bonds can be formed in the molecule and between the molecules, so that physical cross-linking occurs in the molecular chain. Due to the thermodynamic incompatibility of the cross-linked soft and hard phases, it makes The aggregation of hard segments and soft segments leads to microphase separation, that is, the uniform cross distribution of soft and hard segments acts as an elastic crosslinking effect, which makes polyurethane have excellent mechanical properties and various characteristics such as insulation, oil resistance, hydrolysis r...

Examples

Embodiment 1

[0032] (1) Preparation of component A

[0033] In parts by weight, 50 parts of hydroxyl-terminated polybutadiene, 10 parts of polycaprolactone diol, 30 parts of polypropylene glycol, 10 parts of trimethylolpropane, 5 parts of 9,10-dihydro-9-oxygen Hetero-10-phosphaphenanthrene-10-oxide was stirred at 1000 rpm and vacuum at 120°C for 3 hours, mixed evenly and cooled to 50°C to obtain the component A.

[0034] (2) Take 56 parts of component A and 40 parts of component B (4,4'-diphenylmethane diisocyanate) in the same container, and stir at room temperature for 5 minutes until the mixture is uniform to obtain a solvent-free two-component polyurethane.

Embodiment 2

[0036] (1) Preparation of component A

[0037] In parts by weight, 60 parts of hydroxyl-terminated polybutadiene, 10 parts of polycaprolactone triol, 10 parts of polypropylene glycol, 5 parts of trimethylolethane, 10 parts of 9,10-dihydro-9- Oxa-10-phosphaphenanthrene-10-oxide, stirred at 1500 rpm and vacuum at 100°C for 3 hours, mixed uniformly and cooled to 70°C to obtain the component A.

[0038] (2) Take 60 parts of component A and 40 parts of component B (toluene diisocyanate) in the same container, stir at room temperature for 6 minutes until they are evenly mixed to obtain a solvent-free two-component polyurethane.

Embodiment 3

[0040] (1) Preparation of component A

[0041] In parts by weight, 40 parts of hydroxyl-terminated polybutadiene, 25 parts of polycaprolactone diol, 25 parts of polypropylene glycol, 10 parts of trimethylolpropane, 10 parts of 9,10-dihydro-9-oxygen Hetero-10-phosphaphenanthrene-10-oxide was stirred at 1600 rpm and vacuum at 110°C for 2.5 hours, mixed evenly and cooled to 50°C to obtain the component A.

[0042] (2) Take 60 parts of component A and 40 parts of component B (toluene diisocyanate) in the same container, stir at room temperature for 8 minutes until they are evenly mixed to obtain a solvent-free two-component polyurethane.

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