阅读说明：本技术 一种提高鳞片石墨抗氧化性的抗氧化剂及其应用 (A kind of antioxidative antioxidant of raising crystalline flake graphite and its application ) 是由 黄兴 王文虎 耿艳春 于 2019-09-12 设计创作，主要内容包括：本发明提供一种提高鳞片石墨抗氧化性的抗氧化剂及其应用,属于石墨材料领域。本发明抗氧化剂包括磷酸、草酸、乙醇和聚乙二醇,其中磷酸和草酸能协同提高鳞片石墨的抗氧化性以及膨化后柔性石墨的产出率；乙醇作为稀释剂能使磷酸、草酸、聚乙二醇与鳞片石墨充分接触；聚乙二醇作为分散剂,能使磷酸和草酸均匀地、结合力强地分散于鳞片石墨中,确保所述抗氧化剂处理过的石墨成分均一,抗氧化速率稳定；采用溶液浸渍法使该抗氧化剂充分地浸透到鳞片石墨层隙间,不仅能均匀且大幅度地提高石墨的抗氧化性,而且方法简单,不易扬尘。(The present invention provides a kind of antioxidative antioxidant of raising crystalline flake graphite and its application, belongs to graphite material field.Antioxidant of the present invention includes the output capacity that phosphoric acid, oxalic acid, ethyl alcohol and polyethylene glycol, wherein phosphoric acid and oxalic acid can cooperate with soft graphite after the inoxidizability and extruding that improve crystalline flake graphite；Ethyl alcohol can be such that phosphoric acid, oxalic acid, polyethylene glycol and crystalline flake graphite comes into full contact with as diluent；Polyethylene glycol as dispersing agent, can make phosphoric acid and oxalic acid equably, binding force is scattered in crystalline flake graphite by force, it is ensured that the processed graphite content of antioxidant is uniform, and speed of composite coating is stablized；Between so that the antioxidant is fully impregnated into crystalline flake graphite layer gap using solution dipping method, uniformly and the inoxidizability of graphite can not only be significantly increased, and method is simple, is not easy fugitive dust.)

1. a kind of antioxidative antioxidant of raising crystalline flake graphite, it is characterised in that: the antioxidant includes phosphoric acid, grass Acid, diluent and dispersing agent, the diluent include ethyl alcohol, and the dispersing agent includes polyethylene glycol.

2. antioxidant according to claim 1, it is characterised in that: it is calculated on the basis of the total amount of antioxidants, Phosphoric acid accounts for 1-3.5%, and oxalic acid accounts for 0.5-1.5%, and ethyl alcohol accounts for 94.5-98.2%, and polyethylene glycol accounts for 0.3-0.5%；Preferably, phosphorus Acid accounts for 2-3.5%, and oxalic acid accounts for 1-1.5%, and ethyl alcohol accounts for 94.5-96.5%, and polyethylene glycol accounts for 0.3-0.5%.

3. a kind of purposes of antioxidant as claimed in claim 1 or 2, it is characterised in that: the antioxidant is applied to mention The inoxidizability of high crystalline flake graphite.

4. a kind of crystalline flake graphite is using oxidation-resistant graphite made of antioxidant as claimed in claim 1 or 2.

5. a kind of preparation method of oxidation-resistant graphite as claimed in claim 4, it is characterised in that: the preparation method passes through molten Oxidation-resistant graphite is made in graphite raw material by liquid infusion process, and the graphite raw material is crystalline flake graphite.

6. the preparation method according to claim 4, it is characterised in that: partial size mesh number≤80 of the graphite raw material.

7. the preparation method according to claim 4, it is characterised in that: the dipping temperature is 75-85 DEG C.

8. the preparation method according to claim 4, it is characterised in that: the weight of the antioxidant and the graphite raw material Than for 3:2.

9. the preparation method according to claim 4, it is characterised in that: the preparation method additionally uses stirring.

10. the preparation method according to claim 4, it is characterised in that: the preparation method is partly led using made of tripoli Body constant temperature system carries out temperature control.

Technical field

The invention belongs to graphite material field, it is related to a kind of antioxidative antioxidant of raising crystalline flake graphite and its answers With.

Background technique

There is carcinogenic risk to people after asbestos material, after by world disabling, soft graphite is as a kind of with preferable The sealing material of resilience, self-lubrication and high temperature resistance has been widely used in various superhigh temperature building rings The sealing of the high temperature and pressure of border, especially fluid device.All graphite is improved in research in the world now to resist in a high temperauture environment Oxidisability is to improve anti-burning disability power at a high temperature of graphite.Currently, being pushed up the most with the graphite antioxygenic property of German SGL company Point can accomplish 670 DEG C/h (1h at 670 DEG C) loss on ignition less than 1% on their best technique parameter process；Royal Dutch Shell is public simultaneously Department's regulation also wants loss on ignition≤4% under 670 DEG C/h to the buying technical indicator of supplier；And China standard JB/T7758.2- On 2005, loss on ignition≤20% under 600 DEG C/h of graphite material ((1h at 600 DEG C)) is only provided, this obvious far behind world It is horizontal.

China is the big country of soft graphite production, and world market occupancy volume up to 70%, answer by graphite material deep processing and industry It is the task of a urgent national strategy with the Study of Lifting of performance.

Summary of the invention

In order to overcome the disadvantages mentioned above and deficiency of the prior art, the purpose of the present invention is to provide a kind of raising crystalline flake graphites Antioxidative antioxidant and its application, poor to solve existing graphite product heat-resisting ability, output is rolled over when high temperature puffing The technical problems such as damage is big, and antioxidant dispersion is uneven and poor with material binding force, and antioxygen rate is unstable.

In a first aspect, the present invention provides a kind of antioxidative antioxidants of raising crystalline flake graphite comprising phosphoric acid, grass Acid, diluent and dispersing agent, the diluent include ethyl alcohol, and the dispersing agent includes polyethylene glycol.In the antioxidant, phosphorus Acid and oxalic acid can cooperate with the output capacity of soft graphite after the inoxidizability and extruding that improve crystalline flake graphite；Ethyl alcohol is as dilution Agent not only can be such that phosphoric acid, oxalic acid, dispersing agent and crystalline flake graphite comes into full contact with, and volatile, convenient for removing；Polyethylene glycol is made For dispersing agent, can make phosphoric acid and oxalic acid equably, binding force is scattered in crystalline flake graphite by force, it is ensured that the antioxidant processing The graphite content crossed is uniform, and speed of composite coating is stablized.In addition, natural flake graphite be floatability is best in nature ore it One, floatability, lubricity and plasticity are more superior than other types graphite；Other kinds of graphite is compared, using described Antioxidant can more significantly improve the inoxidizability of crystalline flake graphite.

As the preferred embodiment of antioxidant of the present invention, calculated on the basis of the total amount of antioxidants, phosphoric acid 1-3.5% is accounted for, oxalic acid accounts for 0.5-1.5%, and ethyl alcohol accounts for 94.5-98.2%, and polyethylene glycol accounts for 0.3-0.5%.Through described anti-oxidant 670 DEG C/h loss on ignition≤10.2% of the processed graphite of agent, carbon content >=98%, the output capacity of soft graphite after extruding >= 83%.

As the preferred embodiment of antioxidant of the present invention, calculated on the basis of the total amount of antioxidants, phosphorus Acid accounts for 2-3.5%, and oxalic acid accounts for 1-1.5%, and ethyl alcohol accounts for 94.5-96.5%, and polyethylene glycol accounts for 0.3-0.5%.Through described anti-oxidant 670 DEG C/h loss on ignition≤5.6% of the processed graphite of agent, carbon content >=98%, the output capacity of soft graphite reaches after extruding 89%.

Second aspect, the present invention also provides a kind of purposes of above-mentioned antioxidant, i.e., are applied to the antioxidant Improve the inoxidizability of crystalline flake graphite.

The third aspect, the present invention also provides a kind of crystalline flake graphites using oxidation-resistant graphite made of above-mentioned antioxidant.

Fourth aspect, the present invention also provides a kind of preparation methods of above-mentioned oxidation-resistant graphite, pass through solution dipping method Oxidation-resistant graphite is made in graphite raw material, the graphite raw material is crystalline flake graphite.The preparation method passes through the graphite is former Material is completely infused in the antioxidant, between enabling the fully penetrated layer gap to the graphite raw material of the antioxidant, no Only method is simple, and is not easy fugitive dust.

As preparation method preferred embodiment of the present invention, partial size mesh number≤80 of the graphite raw material, such as 10 mesh, 20 Mesh, 50 mesh, 80 mesh.The partial size mesh number of the raw material is smaller, and partial size is bigger, and the quality of gained oxidation-resistant graphite is better.

As the preferred embodiment of preparation method of the present invention, the partial size mesh number of the graphite raw material is 10~80.

As preparation method preferred embodiment of the present invention, the dipping temperature of the preparation method is 75-85 DEG C.

As the preferred embodiment of preparation method of the present invention, the dipping temperature of the preparation method is 80 DEG C.

As preparation method preferred embodiment of the present invention, the weight ratio of the antioxidant and the graphite raw material is 3:2。

As the preferred embodiment of preparation method of the present invention, the preparation method also promotes antioxidant using stirring It penetrates between the layer gap of graphite raw material.

As the preferred embodiment of preparation method of the present invention, the preparation method utilizes the Double shaft stirring of horizontal alignment Paddle is stirred.The twin shaft difference tooth of the horizontal alignment is any obvious change of Double shaft stirring paddle disclosed in CN 204638036U Shape mode.

As the preferred embodiment of preparation method of the present invention, the preparation method is using semiconductor thermostatic and temperature made of tripoli System carries out temperature control.Semiconductor thermostatic and temperature system made of tripoli can control system temperature difference and meet: -2 DEG C≤temperature difference≤2 ℃。

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

(1) present invention improves the antioxidative antioxidant of crystalline flake graphite, on the one hand can be cooperateed with by phosphoric acid and oxalic acid The output capacity of soft graphite after the inoxidizability and extruding of raising crystalline flake graphite；On the one hand using ethyl alcohol as diluent, can make Phosphoric acid, oxalic acid, polyethylene glycol and crystalline flake graphite come into full contact with；On the other hand using polyethylene glycol as dispersing agent, can make phosphoric acid with Oxalic acid is equably, binding force is scattered in crystalline flake graphite by force, it is ensured that the processed graphite content of antioxidant is uniform, resists Oxidation rate is stablized.

(2) preparation method of oxidation-resistant graphite of the present invention can not only be uniform and the anti-oxidant of crystalline flake graphite is significantly increased Property, and method is simple, is not easy fugitive dust.

Specific embodiment

To better illustrate the object, technical solutions and advantages of the present invention, below in conjunction with specific embodiment to the present invention It is described further.