阅读说明：本技术 一种增强型氟橡胶23及其制备方法 (Enhanced fluororubber 23 and preparation method thereof ) 是由 蔡贾林 刘国强 王德海 于 2019-10-14 设计创作，主要内容包括：本发明公开一种增强型氟橡胶23及其制备方法,其配方组成为：氟橡胶23：70～80份、HTPB：18～20份、固化剂：1.5～2份、增容剂：2～3份、改性剂：0.8～1.2份。本发明通过采用HTPB预聚体、固化剂、增溶剂和改性剂在氟橡胶23中引入网状HTPB,在传统氟橡胶中加入弹性网络结构提高了氟橡胶23的弹性和低温力学性能。(The invention discloses an enhanced fluororubber 23 and a preparation method thereof, and the enhanced fluororubber comprises the following components in formula: fluororubber 23: 70-80 parts of HTPB: 18-20 parts of curing agent: 1.5-2 parts of a compatibilizer: 2-3 parts of a modifier: 0.8 to 1.2 portions. According to the invention, the HTPB is introduced into the fluororubber 23 by adopting the HTPB prepolymer, the curing agent, the solubilizer and the modifier, and the elasticity and the low-temperature mechanical property of the fluororubber 23 are improved by adding the elastic network structure into the traditional fluororubber.)

1. The reinforced fluororubber 23 is characterized by comprising the following components in parts by weight: fluororubber 23: 70-80 parts of HTPB: 18-20 parts of curing agent: 1.5-2 parts of a compatibilizer: 2-3 parts of a modifier: 0.8 to 1.2 portions.

2. The reinforced fluororubber 23 according to claim 1, wherein the HTPB has an average molecular weight of 1000 to 1500 g/mol.

3. The reinforced fluoroelastomer 23 of claim 1 wherein said curing agent is diphenylmethane diisocyanate.

4. The reinforced fluoroelastomer 23 of claim 1 wherein said compatibilizer is a vinyl acrylate.

5. The reinforced fluororubber 23 according to claim 1, wherein said modifier is an epoxy acrylic resin.

6. A preparation method of reinforced fluororubber 23 is characterized by comprising the following steps:

step A: adding the fluororubber 23 into butyl acetate to prepare a fluororubber solution with the mass fraction of 7-9%;

and B: b, sieving the solution obtained in the step A by using a 100-mesh sieve to remove large-particle prepolymer in the solution;

and C: adding the solution obtained in the step B into a vacuum stirrer, and controlling the rotating speed to be 100-150 revolutions per minute and the temperature to be room temperature;

step D: weighing the compatibilizer and the modifier, adding the compatibilizer and the modifier into the solution obtained in the step C under the stirring condition, and stirring for 10-15 minutes;

step E: weighing HTPB and a curing agent, adding the curing agent into the HTPB, and manually stirring uniformly to obtain an HTPB solution;

step F: adding the HTPB solution into the fluororubber solution in the step D, and mechanically stirring for 10-15 minutes;

step F: starting heating and vacuum, controlling the heating temperature to be 60-65 ℃, controlling the vacuum degree to be-3 Mpa-5 Mpa, controlling the stirring speed to be 80-100 rpm, and stirring for 30-40 min;

step G: after the step F is finished, adjusting the heating temperature to be 40-45 ℃, controlling the vacuum degree to be-8-10 Mpa, controlling the stirring speed to be 20-30 rpm, and slowly stirring for 2-2.5 hours;

step H: taking out the viscous fluororubber solution obtained in the step G, and pouring the solution into a mold;

step I: and D, taking out the die in the step H, putting the die into a vacuum oven, controlling the vacuum degree to be-8 Mpa to-10 Mpa and the temperature to be 40-45 ℃, curing for 24-35 hours to solidify and form the material, and then opening the die to obtain the required enhanced fluororubber 23.

Technical Field

The invention belongs to the field of high polymer materials, and particularly relates to enhanced fluororubber 23 and a preparation method thereof.

Background

The fluororubber 23 is a vinylidene fluoride and chlorotrifluoroethylene copolymer, has the characteristics of stable physical and chemical properties, excellent electrical insulation performance and excellent radiation resistance, and is widely applied to the fields of aerospace, military industry, automobiles, petrochemical industry and the like. However, the fluororubber 23 has the disadvantage of poor elasticity and cold resistance, mainly because fluorine atoms in the fluororubber have strong electronegativity, and the strong electron-withdrawing ability causes the C-C bond energy on the molecular chain of the polymer to change greatly, so that the rigidity of the molecular chain is poor. Because the elasticity and the cold resistance of the rubber 23 are not good, the low-temperature environment adaptability of the formed part of the rubber 23 is seriously influenced, and the application range of the rubber 23 is limited. Therefore, it is of great practical significance to improve the elasticity and cold resistance of the fluororubber 23.

The invention provides an enhanced fluororubber 23 and a preparation method thereof, the method can increase the elasticity of the fluororubber 23, reduce the brittleness temperature of the fluororubber 23 and improve the comprehensive performance of the fluororubber, and the method for enhancing the fluororubber 23 is not reported at present.

Disclosure of Invention

The invention aims to provide a reinforced fluororubber 23 and a preparation method thereof, which can improve the elasticity of the fluororubber 23 and reduce the brittleness temperature of the fluororubber 23.

In order to achieve the technical effects, the invention adopts the following technical scheme:

the reinforced fluororubber 23 comprises the following components in parts by weight: fluororubber 23: 70-80 parts of HTPB: 18-20 parts of curing agent: 1.5-2 parts of a compatibilizer: 2-3 parts of a modifier: 0.8 to 1.2 portions.

The average molecular weight of the HTPB is 1000-1500 g/mol;

the curing agent is diphenylmethane diisocyanate (MDI);

the compatibilizer is vinyl acrylate;

the modifier is epoxy acrylic resin;

a preparation method of reinforced fluororubber 23 comprises the following steps:

step A: quantitatively weighing fluororubber 23, and adding the fluororubber 23 into butyl acetate to prepare a fluororubber solution with the mass content of 7-9%;

and B: b, sieving the solution obtained in the step A by using a 100-mesh sieve to remove large-particle prepolymer in the solution;

and C: adding the solution obtained in the step B into a vacuum stirrer, and controlling the rotating speed to be 100-150 revolutions per minute and the temperature to be room temperature;

step D: quantitatively weighing the compatibilizer and the modifier, adding the compatibilizer and the modifier into the solution obtained in the step C under the stirring condition, and stirring for 10-15 minutes;

step E: quantitatively weighing HTPB and MDI, adding MDI into the HTPB, and manually stirring uniformly;

step F: adding the HTPB solution into the fluororubber solution in the step D, and mechanically stirring for 10-15 minutes;

step F: starting heating and vacuum, controlling the heating temperature to be 60-65 ℃, controlling the vacuum degree to be-3 Mpa-5 Mpa, controlling the stirring speed to be 80-100 rpm, and stirring for 30-40 min;

step G: after the step F is finished, adjusting the heating temperature to be 40-45 ℃, controlling the vacuum degree to be-8-10 Mpa, controlling the stirring speed to be 20-30 rpm, and slowly stirring for 2-2.5 hours;

step H: taking out the viscous fluororubber solution obtained in the step G, and pouring the solution into a mold;

step I: and D, taking out the die in the step H, putting the die into a vacuum oven, controlling the vacuum degree to be-8 Mpa to-10 Mpa and the temperature to be 40-45 ℃, curing for 24-35 hours to solidify and form the material, and then opening the die to obtain the required enhanced fluororubber 23.

The invention is further explained and illustrated below.

The HTPB crosslinking curing system is adopted to reinforce the fluororubber 23, so that a crosslinking and mutual transmission network structure can be formed in the fluororubber system, and the elasticity of the fluororubber 23 is improved.

By adopting MDI as the curing agent of HTPB in the fluororubber, the degree of hydroxyl groups in the HTPB participating in the reaction curing reaction can be increased, and the crosslinking curing density can be improved.

The vinyl acrylate is used as a solubilizer, so that the compatibility of the HTPB and the fluororubber 23 and the mixing uniformity of long chains and short chains can be improved.

The epoxy acrylic resin is used as a modifier to promote the compatibility of HTPB and fluororubber and promote HTPB crosslinking.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the HTPB is introduced into the fluororubber 23 by adopting the HTPB prepolymer, the curing agent, the solubilizer and the modifier, and the elasticity and the low-temperature mechanical property of the fluororubber 23 are improved by adding the elastic network structure into the traditional fluororubber.

Detailed Description

The invention will be further elucidated and described with reference to the embodiments of the invention described hereinafter.