阅读说明：本技术 一种高强度海洋工程用mc尼龙传动轮的制备方法 (Preparation method of MC nylon transmission wheel for high-strength ocean engineering ) 是由 修昊 卢之国 于 2021-10-29 设计创作，主要内容包括：本发明涉及海洋工程领域的一种高强度海洋工程用MC尼龙传动轮的制备方法；如下步骤进行制备,准备700-1000重量份的尼龙原材料、含有双端羟基的聚醚或聚烯烃预聚体30-40重量份、二异氰酸酯10-20重量份、滑石粉5-8重量份、纳米二氧化钛1-2重量份、石蜡油2-3重量份、玻璃纤维剂3-5重量份、耐磨改性剂3-8计量份；将尼龙原材料投入到真空反应釜中,加热到100℃-140℃,真空度保持在0.02-0.08MPa之间,保持真空度5-10min；该发明具有高强韧、自润滑、耐老化的优点,可替代传统金属轮应用在海洋工程中并提供传动力；而且便于进行生产,成本低廉,能够进行批量化的生产。(The invention relates to a preparation method of a high-strength MC nylon transmission wheel for ocean engineering in the field of ocean engineering; preparing 700-1000 parts by weight of nylon raw material, 30-40 parts by weight of polyether containing double-end hydroxyl or polyolefin prepolymer, 10-20 parts by weight of diisocyanate, 5-8 parts by weight of talcum powder, 1-2 parts by weight of nano titanium dioxide, 2-3 parts by weight of paraffin oil, 3-5 parts by weight of glass fiber agent and 3-8 parts by weight of wear-resistant modifier; putting the nylon raw material into a vacuum reaction kettle, heating to 100-140 ℃, and keeping the vacuum degree between 0.02-0.08MPa for 5-10 min; the invention has the advantages of high toughness, self lubrication and aging resistance, can replace the traditional metal wheel to be applied to ocean engineering and provide transmission force; and the production is convenient, the cost is low, and the mass production can be carried out.)

1. A preparation method of a high-strength MC nylon transmission wheel for ocean engineering; characterized in that the preparation comprises the following steps

The method comprises the following steps: preparing 1000 parts by weight of 700-plus nylon raw material, 30-40 parts by weight of polyether containing double-end hydroxyl or polyolefin prepolymer, 10-20 parts by weight of diisocyanate, 5-8 parts by weight of talcum powder, 1-2 parts by weight of nano titanium dioxide, 2-3 parts by weight of paraffin oil, 3-5 parts by weight of glass fiber agent and 3-8 parts by weight of wear-resistant modifier;

step two: putting the nylon raw material into a vacuum reaction kettle, heating to 100-140 ℃, and keeping the vacuum degree between 0.02-0.08MPa for 5-10 min;

step three: adding polyether containing double-end hydroxyl or polyolefin prepolymer, then adding diisocyanate, keeping the vacuum degree in a reaction kettle between 0.02 MPa and 0.08MPa, heating to 120-150 ℃, and simultaneously carrying out copolymerization with caprolactam in the nylon raw material under the condition of alkaline anion catalysis;

step four: removing vacuum, cooling to normal temperature, placing the semi-finished product in the step three into a centrifugal device for centrifugation, controlling the rotation speed at 1000-; preparing polyurethane/nylon copolymer by centrifugal polymerization;

step five: meanwhile, talcum powder, nano titanium dioxide and paraffin oil are added simultaneously in the centrifugal polymerization process; the talcum powder can be used as a heterogeneous nucleating agent of a nylon raw material, and the paraffin oil can migrate to the surface of the nylon raw material in the high-speed centrifugal polymerization process, so that the hydrophobicity of the nylon raw material is improved;

step six: in the centrifugal polymerization process, the talc powder has heterogeneous nucleation effect on the nylon raw material, and high-speed centrifugal force in the centrifugal polymerization process is combined to ensure that talc powder sheets are arranged in parallel; simultaneously, the crystallinity of the nylon raw material is ensured;

step seven: keeping the temperature for 5-13min, placing into a vacuum reaction kettle for polymerization, adding glass fiber agent and wear-resistant modifier, heating to 120-140 deg.C, stirring while vacuumizing, and maintaining the vacuum degree at 0.03-0.05MPa for 5-10 min;

step eight: preheating the die to ensure that the temperature of the die and the temperature of the discharged polymer are not too different, adding the semi-finished product obtained in the step seven into the die, placing the die into a centrifuge to rotate, controlling the rotating speed at 1200-1500 rpm, keeping the rotating speed for 8-10min, continuously preserving the heat, and finally discharging the die to form an MC nylon transmission wheel blank;

step nine: and (5) cooling and soaking the MC nylon transmission wheel blank in the step eight, drying, and then machining.

2. The method for preparing the MC nylon transmission wheel for the high-strength ocean engineering according to the claim 1, wherein in the fifth step, the talcum powder, the nano titanium dioxide and the paraffin oil are respectively added into three different openings arranged on a centrifugal device simultaneously and quantitatively; the weight ratio of the talcum powder, the nano titanium dioxide and the paraffin oil is 5-8: 1-2: 2-3.

3. The preparation method of the MC nylon transmission wheel for the high-strength ocean engineering according to the claim 1, wherein in the sixth step, the talcum powder forms a special crystal morphology of crystal interlocking in a high-speed centrifugation process, and the path length and difficulty of water molecules diffusing into MC nylon molecules are prolonged and increased.

4. The preparation method of the MC nylon transmission wheel for the high-strength ocean engineering according to the claim 1, wherein in the seventh step, when the glass fiber agent and the wear-resistant modifier are added, the glass fiber agent is added at intervals, the glass fiber agent is added in advance, and then the wear-resistant modifier is added at intervals of 2-5min, so that the reaction time is prolonged.

5. The method for preparing the MC nylon transmission wheel for the high-strength ocean engineering according to the claim 1, wherein in the step eight, the time for preheating the die is controlled to be between 30min and 1h, and then the temperature is properly increased; ensure the normal work of the die.

Technical Field

The invention relates to the field of ocean engineering, in particular to a preparation method.

Background

The transmission wheels for ocean engineering are mostly cast iron wheels, and have a series of problems of high production and transportation cost, easy corrosion, short service life and the like. The traditional MC nylon wheel is difficult to meet the application requirements of high load, high abrasion, high moisture, high ultraviolet ray, low temperature and the like in ocean engineering, and the ocean engineering is a field which is greatly supported and developed by the nation. The traditional driving wheel for ocean engineering is mostly made of metal materials, is easy to corrode and rust in ocean environment, causes the lubricating property to be obviously reduced, greatly reduces the safety performance and the service life, and has the problems of high production and transportation cost and the like. Monomer cast Nylon, also known as Monomer cast Nylon (MC Nylon), is used as a novel engineering plastic and has the outstanding advantages of high crystallinity, large molecular weight, high rigidity and strength, good chemical stability and the like, so that the Monomer cast Nylon can replace the traditional metal pulleys, transmission wheels, sliding blocks, shaft sleeves, bearing bushes and the like and is widely applied to the fields of mechanical equipment, steel industry, mining, construction, aviation, military equipment, railways, ocean engineering and the like. However, most of the MC nylon wheel products of domestic manufacturers at present cannot meet the requirements of specific application environment scenes such as high load, high abrasion, high humidity, high ultraviolet ray, low temperature and the like, so that the development of the MC nylon transmission wheel with high toughness, self-lubrication and aging resistance has urgent technical requirements and wide market prospects.

Disclosure of Invention

The invention aims to provide a preparation method of a high-strength MC nylon transmission wheel for ocean engineering, which has the advantages of high strength and toughness, self-lubrication and aging resistance, can replace the traditional metal wheel to be applied to ocean engineering and provide transmission force; and the production is convenient, the cost is low, and the mass production can be carried out.

The invention aims to provide a preparation method of the MC nylon transmission wheel for high-strength ocean engineering; comprises that

The method comprises the following steps: preparing 1000 parts by weight of 700-plus nylon raw material, 30-40 parts by weight of polyether containing double-end hydroxyl or polyolefin prepolymer, 10-20 parts by weight of diisocyanate, 5-8 parts by weight of talcum powder, 1-2 parts by weight of nano titanium dioxide, 2-3 parts by weight of paraffin oil, 3-5 parts by weight of glass fiber agent and 3-8 parts by weight of wear-resistant modifier;

step two: putting the nylon raw material into a vacuum reaction kettle, heating to 100-140 ℃, and keeping the vacuum degree between 0.02-0.08MPa for 5-10 min;

step three: adding polyether containing double-end hydroxyl or polyolefin prepolymer, then adding diisocyanate, keeping the vacuum degree in a reaction kettle between 0.02 MPa and 0.08MPa, heating to 120-150 ℃, and simultaneously carrying out copolymerization with caprolactam in the nylon raw material under the condition of alkaline anion catalysis;

step four: removing vacuum, cooling to normal temperature, placing the semi-finished product in the step three into a centrifugal device for centrifugation, controlling the rotation speed at 1000-; preparing polyurethane/nylon copolymer by centrifugal polymerization;

step five: meanwhile, talcum powder, nano titanium dioxide and paraffin oil are added simultaneously in the centrifugal polymerization process; the talcum powder can be used as a heterogeneous nucleating agent of a nylon raw material, and the paraffin oil can migrate to the surface of the nylon raw material in the high-speed centrifugal polymerization process, so that the hydrophobicity of the nylon raw material is improved;

step six: in the centrifugal polymerization process, the talc powder has heterogeneous nucleation effect on the nylon raw material, and high-speed centrifugal force in the centrifugal polymerization process is combined to ensure that talc powder sheets are arranged in parallel; simultaneously, the crystallinity of the nylon raw material is ensured;

step seven: keeping the temperature for 5-13min, placing into a vacuum reaction kettle for polymerization, adding glass fiber agent and wear-resistant modifier, heating to 120-140 deg.C, stirring while vacuumizing, and maintaining the vacuum degree at 0.03-0.05MPa for 5-10 min;

step eight: preheating the die to ensure that the temperature of the die and the temperature of the discharged polymer are not too different, adding the semi-finished product obtained in the step seven into the die, placing the die into a centrifuge to rotate, controlling the rotating speed at 1200-1500 rpm, keeping the rotating speed for 8-10min, continuously preserving the heat, and finally discharging the die to form an MC nylon transmission wheel blank;

step nine: and (5) cooling and soaking the MC nylon transmission wheel blank in the step eight, drying, and then machining.

During preparation, 1000 parts by weight of 700-plus nylon raw material, 30-40 parts by weight of polyether containing double-end hydroxyl or polyolefin prepolymer, 10-20 parts by weight of diisocyanate, 5-8 parts by weight of talcum powder, 1-2 parts by weight of nano titanium dioxide, 2-3 parts by weight of paraffin oil, 3-5 parts by weight of glass fiber agent and 3-8 parts by weight of wear-resistant modifier are prepared; putting the nylon raw material into a vacuum reaction kettle, heating to 100-140 ℃, and keeping the vacuum degree between 0.02-0.08MPa for 5-10 min; adding polyether containing double-end hydroxyl or polyolefin prepolymer, then adding diisocyanate, keeping the vacuum degree in a reaction kettle between 0.02 MPa and 0.08MPa, heating to 120-150 ℃, and simultaneously carrying out copolymerization with caprolactam in the nylon raw material under the condition of alkaline anion catalysis; removing vacuum, cooling to normal temperature, placing the semi-finished product in the step three into a centrifugal device for centrifugation, controlling the rotation speed at 1000-; preparing polyurethane/nylon copolymer by centrifugal polymerization; meanwhile, talcum powder, nano titanium dioxide and paraffin oil are added simultaneously in the centrifugal polymerization process; the talcum powder can be used as a heterogeneous nucleating agent of a nylon raw material, and the paraffin oil can migrate to the surface of the nylon raw material in the high-speed centrifugal polymerization process, so that the hydrophobicity of the nylon raw material is improved; in the centrifugal polymerization process, the talc powder has heterogeneous nucleation effect on the nylon raw material, and high-speed centrifugal force in the centrifugal polymerization process is combined to ensure that talc powder sheets are arranged in parallel; simultaneously, the crystallinity of the nylon raw material is ensured; keeping the temperature for 5-13min, placing into a vacuum reaction kettle for polymerization, adding glass fiber agent and wear-resistant modifier, heating to 120-140 deg.C, stirring while vacuumizing, and maintaining the vacuum degree at 0.03-0.05MPa for 5-10 min; preheating the die to ensure that the temperature of the die and the temperature of the discharged polymer are not too different, adding the semi-finished product obtained in the step seven into the die, placing the die into a centrifuge to rotate, controlling the rotating speed at 1200-1500 rpm, keeping the rotating speed for 8-10min, continuously preserving the heat, and finally discharging the die to form an MC nylon transmission wheel blank; and (5) cooling and soaking the MC nylon transmission wheel blank in the step eight, drying, and then machining.

The invention has the advantages of high toughness, self lubrication and aging resistance, and can replace the traditional metal wheel to be applied to ocean engineering and provide transmission force; and the production is convenient, the cost is low, and the mass production can be carried out.

As a further improvement of the invention, in order to ensure that the talcum powder can be fully polymerized, the polymerization effect is improved; in the sixth step, the talcum powder forms a special crystal shape with crystal interlocking in the high-speed centrifugation process, and the path length and difficulty of water molecules diffusing into MC nylon molecules are prolonged and increased.

As a further improvement of the invention, in order to ensure that the glass fiber agent and the wear-resistant modifier can be fully polymerized with the nylon raw material; and seventhly, adding the glass fiber agent and the wear-resistant modifier at intervals, adding the glass fiber agent in advance, and adding the wear-resistant modifier at intervals of 2-5min to prolong the reaction time.

As a further improvement of the invention, in order to ensure the stable work and avoid damaging the die and excessively consuming energy; in the step eight, the time for preheating the die is controlled to be between 30min and 1h, and then the temperature is properly increased; ensure the normal work of the die.

Drawings

FIG. 1 is a first polyurethane copolymerization scheme in accordance with the present invention;

FIG. 2 is a second scheme for the copolymerization of polyurethanes in accordance with the present invention;

FIG. 3 is a third diagram of the copolymerization scheme of polyurethane according to the present invention;

FIG. 4 is a microscopic scanning electron micrograph of the interlocking crystalline morphology MC nylon;

FIG. 5 is a schematic diagram of the mechanism of interlocking crystalline morphologies to resist hydrolysis.

Detailed Description

Example 1

As shown in figures 1-5, the invention, when applied for the purpose, comprises a preparation method of a high-strength MC nylon transmission wheel for ocean engineering; comprises that

The method comprises the following steps: preparing 750 parts by weight of nylon raw material, 35 parts by weight of polyether containing double end hydroxyl groups or polyolefin prepolymer, 15 parts by weight of diisocyanate, 6.5 parts by weight of talcum powder, 1.3 parts by weight of nano titanium dioxide, 2.2 parts by weight of paraffin oil, 3.6 parts by weight of glass fiber agent and 4.5 parts by weight of wear-resistant modifier;

step two: putting a nylon raw material into a vacuum reaction kettle, heating to 120 ℃, and keeping the vacuum degree at 0.03MPa for 6.5 min;

step three: adding polyether containing double-end hydroxyl or polyolefin prepolymer, then adding diisocyanate, keeping the vacuum degree in a reaction kettle at 0.03MPa, heating to 130 ℃, and simultaneously carrying out copolymerization with caprolactam in the nylon raw material under the alkaline anionic catalysis condition;

step four: removing vacuum, cooling to normal temperature, placing the semi-finished product in the third step into a centrifugal device for centrifugation, controlling the rotation speed at 1200 r/min, and keeping for 6 min; preparing polyurethane/nylon copolymer by centrifugal polymerization;

step five: meanwhile, talcum powder, nano titanium dioxide and paraffin oil are added simultaneously in the centrifugal polymerization process; the talcum powder can be used as a heterogeneous nucleating agent of a nylon raw material, and the paraffin oil can migrate to the surface of the nylon raw material in the high-speed centrifugal polymerization process, so that the hydrophobicity of the nylon raw material is improved;

step six: in the centrifugal polymerization process, the talc powder has heterogeneous nucleation effect on the nylon raw material, and high-speed centrifugal force in the centrifugal polymerization process is combined to ensure that talc powder sheets are arranged in parallel; simultaneously, the crystallinity of the nylon raw material is ensured;

step seven: keeping the temperature for 7min, placing into a vacuum reaction kettle for polymerization, adding glass fiber agent and wear-resistant modifier, heating to 125 deg.C, stirring while vacuumizing, and keeping the vacuum degree at 0.04MPa for 6 min;

step eight: preheating the die to ensure that the temperature of the die and the temperature of the discharged polymer do not differ too much, adding the semi-finished product obtained in the step seven into the die, placing the die into a centrifuge to rotate, controlling the rotation speed at 1300 revolutions per minute, keeping the rotation speed for 8.5 minutes, keeping the temperature continuously, and finally demoulding to form an MC nylon transmission wheel blank;

step nine: and (5) cooling and soaking the MC nylon transmission wheel blank in the step eight, drying, and then machining.

In the sixth step, the talcum powder forms a special crystal shape with crystal interlocking in the high-speed centrifugation process, and the path length and difficulty of water molecules diffusing into MC nylon molecules are prolonged and increased.

And in the seventh step, when the glass fiber agent and the wear-resistant modifier are added, the glass fiber agent is required to be added at intervals, the glass fiber agent is required to be added in advance, and then the wear-resistant modifier is added at intervals of 2.5min, so that the reaction time is prolonged.

In the step eight, the time for preheating the die is controlled to be 35min, and then the temperature is properly increased; ensure the normal work of the die.

Example two:

as shown in figures 1-5, the invention, when applied for the purpose, comprises a preparation method of a high-strength MC nylon transmission wheel for ocean engineering; comprises that

The method comprises the following steps: preparing 795 parts by weight of nylon raw material, 38 parts by weight of polyether containing double end hydroxyl groups or polyolefin prepolymer, 17 parts by weight of diisocyanate, 6.7 parts by weight of talcum powder, 1.4 parts by weight of nano titanium dioxide, 2.4 parts by weight of paraffin oil, 3.8 parts by weight of glass fiber agent and 4.7 parts by weight of wear-resistant modifier;

step two: putting a nylon raw material into a vacuum reaction kettle, heating to 125 ℃, and keeping the vacuum degree at 0.04MPa for 7.5 min;

step three: adding polyether containing double-end hydroxyl or polyolefin prepolymer, then adding diisocyanate, keeping the vacuum degree in a reaction kettle at 0.04MPa, heating to 140 ℃, and simultaneously carrying out copolymerization with caprolactam in the nylon raw material under the alkaline anionic catalysis condition;

step four: removing vacuum, cooling to normal temperature, placing the semi-finished product in the third step into a centrifugal device for centrifugation, controlling the rotation speed at 1300 rpm, and keeping for 7 min; preparing polyurethane/nylon copolymer by centrifugal polymerization;

step five: meanwhile, talcum powder, nano titanium dioxide and paraffin oil are added simultaneously in the centrifugal polymerization process; the talcum powder can be used as a heterogeneous nucleating agent of a nylon raw material, and the paraffin oil can migrate to the surface of the nylon raw material in the high-speed centrifugal polymerization process, so that the hydrophobicity of the nylon raw material is improved;

step six: in the centrifugal polymerization process, the talc powder has heterogeneous nucleation effect on the nylon raw material, and high-speed centrifugal force in the centrifugal polymerization process is combined to ensure that talc powder sheets are arranged in parallel; simultaneously, the crystallinity of the nylon raw material is ensured;

step seven: keeping the temperature for 9min, placing into a vacuum reaction kettle for polymerization, adding glass fiber agent and wear-resistant modifier, heating to 132 deg.C, stirring while vacuumizing, and maintaining the vacuum degree at 0.045MPa for 7 min;

step eight: preheating the die to ensure that the temperature of the die and the temperature of the discharged polymer are not too different, adding the semi-finished product obtained in the step seven into the die, placing the die into a centrifugal machine to rotate, controlling the rotating speed at 1400 revolutions per minute, keeping the rotating speed for 9 minutes, keeping the temperature continuously, and finally demoulding to form an MC nylon transmission wheel blank;

step nine: and (5) cooling and soaking the MC nylon transmission wheel blank in the step eight, drying, and then machining.

In the sixth step, the talcum powder forms a special crystal shape with crystal interlocking in the high-speed centrifugation process, and the path length and difficulty of water molecules diffusing into MC nylon molecules are prolonged and increased.

And seventhly, adding the glass fiber agent and the wear-resistant modifier at intervals, adding the glass fiber agent in advance, adding the wear-resistant modifier at intervals of 3min, and prolonging the reaction time.

In the step eight, the time for preheating the die is controlled to be 40min, and then the temperature is properly increased; ensure the normal work of the die.

Example three:

as shown in figures 1-5, the invention, when applied for the purpose, comprises a preparation method of a high-strength MC nylon transmission wheel for ocean engineering; comprises that

The method comprises the following steps: preparing 850 parts by weight of nylon raw material, 39 parts by weight of polyether containing double end hydroxyl groups or polyolefin prepolymer, 18 parts by weight of diisocyanate, 6.8 parts by weight of talcum powder, 1.7 parts by weight of nano titanium dioxide, 2.6 parts by weight of paraffin oil, 4.2 parts by weight of glass fiber agent and 5.5 parts by weight of wear-resistant modifier;

step two: putting a nylon raw material into a vacuum reaction kettle, heating to 135 ℃, and keeping the vacuum degree at 0.06MPa for 8 min;

step three: adding polyether containing double-end hydroxyl or polyolefin prepolymer, then adding diisocyanate, keeping the vacuum degree in a reaction kettle at 0.07MPa, heating to 145 ℃, and simultaneously carrying out copolymerization with caprolactam in the nylon raw material under the alkaline anionic catalysis condition;

step four: removing vacuum, cooling to normal temperature, placing the semi-finished product in the third step into a centrifugal device for centrifugation, controlling the rotation speed at 1400 rpm, and keeping for 9 min; preparing polyurethane/nylon copolymer by centrifugal polymerization;

step five: meanwhile, talcum powder, nano titanium dioxide and paraffin oil are added simultaneously in the centrifugal polymerization process; the talcum powder can be used as a heterogeneous nucleating agent of a nylon raw material, and the paraffin oil can migrate to the surface of the nylon raw material in the high-speed centrifugal polymerization process, so that the hydrophobicity of the nylon raw material is improved;

step six: in the centrifugal polymerization process, the talc powder has heterogeneous nucleation effect on the nylon raw material, and high-speed centrifugal force in the centrifugal polymerization process is combined to ensure that talc powder sheets are arranged in parallel; simultaneously, the crystallinity of the nylon raw material is ensured;

step seven: keeping the temperature for 12min, placing into a vacuum reaction kettle for polymerization, adding glass fiber agent and wear-resistant modifier, heating to 135 deg.C, stirring while vacuumizing, and keeping the vacuum degree at 0.048MPa for 9.5 min;

step eight: preheating the die to ensure that the temperature of the die and the temperature of the discharged polymer are not too different, adding the semi-finished product obtained in the step seven into the die, placing the die into a centrifuge to rotate, controlling the rotation speed at 1450 revolutions per minute, keeping the rotation speed for 9 minutes, keeping the temperature for continuous preservation, and finally demoulding to form an MC nylon transmission wheel blank;

step nine: and (5) cooling and soaking the MC nylon transmission wheel blank in the step eight, drying, and then machining.

In the sixth step, the talcum powder forms a special crystal shape with crystal interlocking in the high-speed centrifugation process, and the path length and difficulty of water molecules diffusing into MC nylon molecules are prolonged and increased.

And in the seventh step, when the glass fiber agent and the wear-resistant modifier are added, the glass fiber agent is required to be added at intervals, the glass fiber agent is required to be added in advance, and then the wear-resistant modifier is added at intervals of 4.5min, so that the reaction time is prolonged.

In the step eight, the time for preheating the die is controlled to be 50min, and then the temperature is properly increased; ensure the normal work of the die.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications should also be considered as within the scope of the invention.