CN113943467A - Fluororubber composition and preparation method and application thereof - Google Patents
Fluororubber composition and preparation method and application thereof Download PDFInfo
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Abstract
The application relates to the technical field of high polymer materials, in particular to a fluororubber composition and a preparation method and application thereof. A fluororubber composition comprising a fluororubber P757 and a fluororesin; the fluororesin is one or more of PTFE500, Miflon 3021, F-104, FL2032 and FL 2100; the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30). The preparation method comprises the following steps: mixing fluororubber; then mixing the white carbon black, the cross-linking agent, the fluororesin and the fluororubber to obtain mixed rubber; adding a vulcanizing agent into the rubber compound, mixing, and pulling to obtain the rubber. The fluororubber composition can be used in a dynamic sealing element, and has a low friction coefficient, so that the service life of the dynamic sealing element is prolonged.
Description
Technical Field
The application relates to the technical field of sealing materials, in particular to a fluororubber composition and a preparation method and application thereof.
Background
The fluororubber is a synthetic polymer elastomer having fluorine atoms in carbon atoms in the main chain or side chain. The introduction of fluorine atoms endows the rubber with excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance. Therefore, the fluororubber is widely applied in the fields of aerospace, aviation, automobiles, petroleum, household appliances and the like, and is a key material which cannot be replaced in national defense advanced industry.
For example, in the automotive industry, fluororubbers are commonly used for making sealing materials or hoses for use in automotive applications. When the dynamic sealing material is applied to an engine, an AT device or a fuel system of an automobile, the dynamic sealing material isolates parts needing to be lubricated in the engine, the AT device or the fuel system from a force-applying part in a sliding state, so that the parts can be lubricated without leakage of lubricating oil.
In the related art, due to the elastic property of the fluororubber, when the fluororubber dynamic seal and most engineering materials slide relative to each other, the fluororubber dynamic seal generates a large surface friction resistance, so that the dynamic seal is worn, and the service life of the fluororubber dynamic seal is shortened.
Disclosure of Invention
In order to prolong the service life of a fluororubber dynamic sealing material, the application provides a fluororubber composition, and a preparation method and application thereof.
In a first aspect, the present application provides a fluororubber composition, which adopts the following technical scheme:
a fluororubber composition comprising a fluororubber P757 and a fluororesin;
the fluororesin is PTFE500,
3021. One or more of F-104, FL2032, and FL 2100;
the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30).
By adopting the technical scheme, when the fluororesin is PTFE500,
3021. One or more of F-104, FL2032 and FL2100, and the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30), the final productThe dynamic friction coefficient of the fluororubber composition is 0.45-0.50, the static friction coefficient is 0.48-0.59, and the phenomena of sliding and sliding are all generated. Therefore, the fluororubber composition prepared under the above conditions has the advantages of small abrasion and long service life when in use.
Preferably, the fluororesin is
3021。
By adopting the technical scheme, when the fluororesin is
3021 when the composition has a dynamic friction coefficient of 0.45 and a static friction coefficient of 0.48, no slip is observed. Thus, it was shown that the fluororesin
3021 the coefficient of static friction and the coefficient of dynamic friction of the fluororubber composition can be reduced significantly.
Preferably, the weight ratio of the fluororubber P757 to the fluororesin is 100: 30.
By adopting the technical scheme, when the weight ratio of the fluororubber P757 to the fluororesin is 100:30, the dynamic friction coefficient is 0.45-0.50, the static friction coefficient is 0.48-0.59, and the phenomenon of sliding is not generated. Compared with the fluororubber composition prepared by the fluororubber P757 and the fluororesin with the weight ratio of 100:15, the dynamic friction coefficient is relatively reduced by 10 percent, and the static friction coefficient is relatively reduced by 18.64 percent.
Preferably, the composition comprises the following components in parts by weight:
757100 parts of fluororubber;
15-30 parts of fluororesin;
10-15 parts of white carbon black;
0.8-1.2 parts of a vulcanizing agent;
2.4-3.6 parts of a cross-linking agent.
By adopting the technical scheme, the fluororubber composition prepared from the components in parts by weight has the dynamic friction coefficient of 0.41-0.46 and the static friction coefficient of 0.43-0.49, and has no slipping phenomenon. With respect to the fluorine resinIs PTFE500,
3021. One or more of F-104, FL2032 and FL2100, the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30), the prepared fluororubber composition has a dynamic friction coefficient relatively reduced by 8.00-8.89%, and a static friction coefficient relatively reduced by 10.42-16.95%.
Preferably, the weight ratio of the vulcanizing agent to the crosslinking agent is 1: 3.
By adopting the technical scheme, under the condition that other component raw materials and the proportion are the same, when the vulcanizing agent and the cross-linking agent are mixed according to the weight ratio of 1:3, the finally prepared fluororubber composition has the dynamic friction coefficient of 0.41 and the static friction coefficient of 0.49, and has no phenomenon of sliding. Compared with the fluororubber composition prepared by the vulcanizing agent and the crosslinking agent according to the weight ratio of not 1:3, the dynamic friction coefficient is relatively reduced by 2.44 percent, and the static friction coefficient is relatively reduced by 4.65-6.98 percent.
Preferably, the mold release agent HT290 is also included at 0.5-1 part.
By adopting the technical scheme, 0.5-1 part by weight of release agent HT290 is added into the total raw materials for preparing the fluororubber composition, and the finally prepared fluororubber composition has the dynamic friction coefficient of 0.39-0.45 and the static friction coefficient of 0.45-0.53, and has no slipping phenomenon.
Preferably, the white carbon black is any one of R972 and R974.
In a second aspect, the present application provides a method for preparing a fluororubber composition, which adopts the following technical scheme:
a method for preparing a fluororubber composition, comprising the steps of:
mixing the fluororubber for 2-4min at 60-70 ℃ and with the rotation speed set to 15-25 r/min; under the conditions that the temperature is 80-100 ℃ and the rotating speed is set to be 20-40r/min, then the white carbon black, the cross-linking agent, the fluororesin and the fluororubber are mixed for 8-12min to obtain mixed rubber; adding a vulcanizing agent into the rubber compound at the temperature of 60-80 ℃ and the rotating speed of 20-40r/min, mixing for 6-10min, and pulling for 5-7 times to obtain the rubber.
By adopting the technical scheme, the preparation method is simple to operate, the process is easy to control, and repeated operation is facilitated. The prepared and eaten fluororubber composition has low dynamic friction coefficient and static friction coefficient, and does not have the phenomenon of sliding in use. Therefore, the friction force is small, and the service life is long.
Preferably, 0.5 to 1 part by weight of a release agent HT290 is added in combination when the white carbon, the crosslinking agent, the fluororesin and the fluororubber are kneaded.
By adopting the technical scheme, the release agent HT290 is added under the above conditions, the release agent HT290 can exert the maximum effect, and the dynamic friction coefficient and the static friction coefficient of the finally prepared fluororubber composition are effectively reduced, so that the service life of the fluororubber composition is prolonged.
In a third aspect, the present application provides an application of a fluororubber composition, which adopts the following technical scheme:
the application of the fluororubber composition in a dynamic seal.
By adopting the technical scheme, the fluororubber composition has lower dynamic friction coefficient and static friction coefficient, and does not have the phenomenon of sliding when in use. Therefore, when the fluororubber composition is applied to a rubber seal, the abrasion of the seal can be effectively reduced, and the service life of the seal can be prolonged.
In summary, the present application has the following beneficial effects:
1. the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30), and the fluororesin is PTFE500,
3021. One or more of F-104, FL2032 and FL2100, therefore, the final fluororubber composition has the dynamic friction coefficient of 0.45-0.50 and the static friction coefficient of 0.48-0.59, and all of the two have the phenomenon of sliding, and has the advantages of small abrasion and long service life when the fluororubber composition is used;
2. fluororesin is preferably used in the present application
3021 since fluororesin
3021 and fluororubber P757 have good compounding effect, so the final fluororubber composition has a dynamic friction coefficient of 0.41 and a static friction coefficient of 0.43, and no slip phenomenon.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the examples of the present application are commercially available, except for the following specific descriptions:
fluororubber P757, model P757, purchased from Solvay group;
fluororubber G902, model G902, purchased from Dajin Fumigation (China) Co., Ltd.;
fluororesin PTFE500 with the model number of PTFE500 is purchased from Guangzhou Kangoushu Shuangye trading Co., Ltd;
fluororesin
3021 type is
3021, purchased from Jiangsu Meilan chemical Co Ltd;
fluororesin F-104, model F-104, purchased from Dajinflurane chemical (China) Co.Ltd;
the fluororesin FL2032 with the model of FL2032 is purchased from Funuolin New chemical materials Co., Ltd, Zhejiang;
the fluorine resin FL2100 with the model number of FL2100 is purchased from Funuolin New chemical materials Co., Ltd, Zhejiang;
fluororesin MP-310, manufactured by DuPont, USA, purchased from Dijie plastication, Suzhou;
white carbon black R972 and white carbon black R974 are purchased from auto-winning Chuangdegusai (China) investment Limited company;
a vulcanizing agent FRD101 with the model number of FRD101 purchased from Shanghai Kongshi Chemicals Co., Ltd;
crosslinking agent TAIC-100, model TAIC-100, procured from the winning creative goods of Desgassy (China) investment Limited;
the release agent HT290 is purchased from Dalian Olson science and technology Limited, and has the model number of HT 290;
an internal mixer, model ML-1.5L, purchased from Baihong machinery (Shanghai) Co., Ltd;
the mixed rubber has the model of KL-6 and is purchased from Baihong machinery (Shanghai) Co.
The dynamic friction coefficient, the static friction coefficient and whether the phenomenon of sliding is generated or not are detected for the fluororubber compositions prepared in the examples and the comparative examples, and the detection method is as follows:
with reference to GB/T10006-.
Examples and comparative examples
Example 1
A fluororubber composition comprising the components and the respective weights shown in Table 1, prepared by the following steps:
s1: 100kg of fluororubber is added into an internal mixer, the temperature of the internal mixer is adjusted to 65 ℃, and the mixture is mixed for 3min under the condition that the rotating speed is 20 r/min.
S2: 2.4kg of cross-linking agent and 15kg of fluororesin are sequentially added into an internal mixer, the temperature of the internal mixer is adjusted to 90 ℃, and the cross-linking agent, the fluororesin and the fluororubber are mixed for 10min under the condition that the rotating speed is 30r/min, so that the mixed rubber is obtained.
S3: and (3) introducing the rubber compound into an open mill, adjusting the temperature of the open mill to 70 ℃, adding 0.8kg of vulcanizing agent under the condition that the rotating speed is 30r/min, mixing for 8min, and pulling for 5 times to obtain the rubber compound.
Wherein the fluororubber is P757;
the cross-linking agent is TAIC-100;
the fluororesin is
3021；
The vulcanizing agent is FRD 101.
Examples 2 to 5
A fluororubber composition which is different from example 1 in that each component and the corresponding weight are shown in Table 1.
TABLE 1 Components and weights (kg) thereof in examples 1-5
The fluororubber compositions obtained in examples 1 to 5 were examined for the static friction coefficient, the dynamic friction coefficient and the occurrence of the slip phenomenon, and the examination results are shown in Table 2.
TABLE 2 examination results of examples 1 to 5
As can be seen from the analysis of the measured data of the properties in Table 2, the fluororubber compositions prepared in examples 1 to 5 of the present application had a dynamic friction coefficient of 0.45 to 0.50 and a static friction coefficient of 0.48 to 0.59, and were free from the phenomenon of slip. Therefore, the fluororubber composition prepared by the method has low dynamic friction coefficient and static friction coefficient, and does not have the phenomenon of sliding. Therefore, the fluororubber composition prepared by the method is less worn in use, and the service life of the fluororubber composition can be prolonged.
In particular, as is clear from examples 1 and 4 to 5, examples 1 and 4 to 5 are different in weight of the fluororesin. The fluororubber compositions obtained in examples 4 to 5 had a dynamic friction coefficient of 0.47 to 0.50 and a static friction coefficient of 0.50 to 0.59, and the dynamic friction coefficient and the static friction coefficient were relatively increased by 4.44 to 11.11% and 4.17 to 22.92%, respectively, as compared with the fluororubber composition obtained in example 1. It was thus shown that, in the total raw materials for producing the fluororubber composition, when the weight ratio of the fluororubber P757 to the fluororesin was 100:30, the produced fluororubber composition had a low coefficient of dynamic friction and a low coefficient of static friction.
As can be seen from examples 1 to 3, examples 1 to 3 differ in that the fluorine treeThe lipid species are different. The fluororubber compositions obtained in example 1 had a dynamic friction coefficient of 0.45 and a static friction coefficient of 0.48, and the dynamic friction coefficient and the static friction coefficient were relatively reduced by 6.25 to 10.00% and 17.24 to 18.64%, respectively, as compared with the fluororubber compositions obtained in examples 2 and 3. This shows that, in the total raw materials for producing the fluororubber composition, when the weight ratio of the fluororubber P757 to the fluororesin is 100:30, the fluororesin is used
3021 the resulting fluororubber composition has a smaller coefficient of dynamic friction and a smaller coefficient of static friction.
Comparative example 1
A fluororubber composition comprising the components and the respective weights shown in Table 3, prepared by the following steps:
s1: 100kg of fluororubber is added into an internal mixer, the temperature of the internal mixer is adjusted to 65 ℃, and the mixture is mixed for 3min under the condition that the rotating speed is 20 r/min.
S2: 2.4kg of cross-linking agent and 30kg of fluororesin are sequentially added into an internal mixer, the temperature of the internal mixer is adjusted to 90 ℃, and the cross-linking agent, the fluororesin and the fluororubber are mixed for 10min under the condition that the rotating speed is 30r/min, so that the mixed rubber is obtained.
S3: and (3) introducing the rubber compound into an open mill, adjusting the temperature of the open mill to 70 ℃, adding 0.8kg of vulcanizing agent under the condition that the rotating speed is 30r/min, mixing for 8min, and pulling for 5 times to obtain the rubber compound.
Wherein, the fluororubber is G902;
the cross-linking agent is TAIC-100;
the fluororesin is
3021；
The vulcanizing agent is FRD 101.
Comparative examples 2 to 4
A fluororubber composition different from comparative example 1 in that each component and the respective weights thereof are shown in Table 3.
TABLE 3 Components and weights (kg) of comparative examples 1-4
The fluororubber compositions prepared in comparative examples 1 to 4 were subjected to static friction coefficient, dynamic friction coefficient and occurrence of the slip phenomenon, and the results are shown in Table 4.
Table 4 test results of example 1 and comparative examples 1 to 4
As shown by the performance tests in Table 4, the fluororubber G902 in the comparative example 1 is used instead of the fluororubber P757, and compared with the fluororubber composition prepared by using the fluororubber P757 in the example 1, the dynamic friction coefficient is relatively increased by 51.11%, the static friction coefficient is relatively increased by 54.17%, and the phenomenon of sliding is caused.
Comparative example 2 Using 5kg of fluororesin
3021 instead of 15kg of fluororesin
3021 Using 15kg of fluororesin similar to that used in example 1
3021 compared with the fluororubber composition, the dynamic friction coefficient is increased by 51.11% and the static friction coefficient is increased by 56.25%, and the phenomena of slip and sliding occur.
Comparative example 3 Using 32kg of fluororesin
3021 instead of 15kg of fluororesin
3021 Using 15kg of fluororesin similar to that used in example 1
3021 compared with the fluororubber composition, the dynamic friction coefficient is increased by 40.00% and the static friction coefficient is increased by 43.75%, and the phenomena of slip and sliding occur.
Comparative example 4 Using fluororesin MP-310 instead of fluororesin
3021 compared with the fluororubber composition prepared in example 1 using the fluororesin MP-310, the dynamic friction coefficient was increased by 51.11% and the static friction coefficient was increased by 60.42%, and the phenomenon of slip occurred.
It was thus found that when the fluororubber P757 and the fluororesin were mixed in a weight ratio of 100 (15-30), and the fluororesin was PTFE500,
3021. F-104, FL2032 and FL2100, the final fluororubber composition has low dynamic friction coefficient and static friction coefficient, and no slip phenomenon. On the contrary, the raw materials outside the above range, the dynamic friction coefficient and the static friction coefficient of the finally obtained fluororubber composition increase, and the phenomenon of slip occurs. Therefore, the fluororubber composition prepared by the method is less worn in use, and the service life of the fluororubber composition can be prolonged.
Example 6
A fluororubber composition comprising the components and the respective weights shown in Table 5, prepared by the following steps:
s1: 100kg of fluororubber is added into an internal mixer, the temperature of the internal mixer is adjusted to 65 ℃, and the mixture is mixed for 3min under the condition that the rotating speed is 20 r/min.
S2: adding 10kg of white carbon black, 2.4kg of cross-linking agent and 15kg of fluororesin into an internal mixer in sequence, adjusting the temperature of the internal mixer to be 90 ℃, and mixing the white carbon black, the cross-linking agent, the fluororesin and the fluororubber for 10min under the condition that the rotating speed is 30r/min to obtain the rubber compound.
S3: and (3) introducing the rubber compound into an open mill, adjusting the temperature of the open mill to 70 ℃, adding 0.8kg of vulcanizing agent under the condition that the rotating speed is 30r/min, mixing for 8min, and pulling for 5 times to obtain the rubber compound.
Wherein, the fluororubber is G902;
white carbon black is R972;
the cross-linking agent is TAIC-100;
the fluororesin is
3021；
The vulcanizing agent is FRD 101.
Examples 7 to 11
A fluororubber composition which differs from example 6 in that the components and their respective weights are shown in Table 5.
TABLE 5 compositions and weights (kg) thereof in examples 6-11
The fluororubber compositions obtained in examples 6 to 13 were examined for the static friction coefficient, the dynamic friction coefficient and the occurrence of the slip phenomenon, and the examination results are shown in Table 6.
TABLE 6 test results of examples 6 to 13
As can be seen from the analysis of the measured data of the properties in Table 6, the fluororubber compositions prepared in examples 6 to 13 had dynamic friction coefficients of 0.41 to 0.46 and static friction coefficients of 0.43 to 0.49, and were free from the phenomenon of slip. Therefore, in the total raw materials for preparing the fluororubber composition, when the fluororubber P757100 parts, the fluororesin 15-30 parts, the white carbon black 10-15 parts, the vulcanizing agent 0.8-1.2 parts and the crosslinking agent 2.4-3.6 parts are used, wherein the white carbon black is any one of R972 and R974, the finally prepared fluororubber composition has smaller dynamic friction coefficient and static friction coefficient, and the phenomenon of sliding stagnation does not occur. When in use, the friction force is small, and the service life is long.
As can be seen from the comparison of the properties of the fluororubber compositions obtained in examples 6 to 8 with those of the fluororubber composition obtained in example 1, the fluororubber compositions obtained in examples 6 to 8 have a relative decrease in the coefficient of dynamic friction of 4.44 to 8.89% and a relative decrease in the coefficient of static friction of 8.33 to 10.42%. Therefore, the white carbon black R972 or R974 is added into the total raw materials for preparing the fluororubber composition, so that the dynamic friction coefficient and the static friction coefficient of the fluororubber composition can be reduced.
In particular, the properties of example 6 are optimal relative to those of examples 7 and 8.
As compared with the fluororubber compositions obtained in examples 10 to 11, the fluororubber compositions obtained in examples 10 to 11 have a dynamic friction coefficient increased by 2.44% and a static friction coefficient increased by 4.65 to 6.98%. It is thus shown that, in the total raw materials for the preparation of the fluororubber compositions of the present application, the fluororesins
3021 when the amount of the fluorine-containing rubber composition is 30Kg, 10Kg of white carbon black is added to effectively reduce the dynamic friction coefficient and the static friction coefficient of the fluorine-containing rubber composition.
As compared with the properties of the fluororubber compositions obtained in examples 12 to 13, the fluororubber compositions obtained in examples 12 to 13 had a dynamic friction coefficient increased by 12.20% and a static friction coefficient increased by 11.63 to 13.95%. It is thus shown that, when the vulcanizing agent and the cross-linking agent are mixed in a weight ratio of 1:3 in the total raw materials for preparing the fluororubber composition of the present application, the finally obtained fluororubber composition has a low dynamic friction coefficient and a low static friction coefficient.
In particular, the fluororubber composition obtained in example 6 is excellent in properties as compared with examples 7 to 13.
Comparative example 5
A fluororubber composition which is different from the fluororubber composition obtained in example 6 in that the fluororubber composition is obtained
3021 the preparation method is the same as that of example 6 except that the weight of the composition is 32 Kg. The specific components and their respective weights are shown in table 7.
Comparative example 6
A fluororubber composition which is different from the fluororubber composition obtained in example 6 in that a fluororesin is used
3021 the preparation method is the same as that of example 6 except that the weight of the composition is 5 Kg. The specific components and their respective weights are shown in table 7.
Comparative example 7
A fluororubber composition differing from example 6 in that the production method was the same as in example 6 except that 0.6kg of a vulcanizing agent FRD101 and 1.8kg of a crosslinking agent TAIC-100 were used. The specific components and their respective weights are shown in table 7.
TABLE 7 Components and weights (kg) thereof in comparative examples 5-7
The fluororubber compositions prepared in comparative examples 5 to 7 were subjected to static friction coefficient, dynamic friction coefficient and occurrence of the slip phenomenon, and the results are shown in Table 8.
TABLE 8 test results of example 6 and comparative examples 5 to 7
As can be seen from the analysis of the various performance test data in Table 8, in comparative example 5, 32Kg of fluororubber was used
3021 instead of 30kg of fluororubber
3021 Using 30kg of fluororubber in example 6
3021 compared with the fluororubber composition, the dynamic friction coefficient is increased by 53.66% and the static friction coefficient is increased by 51.16%, resulting in slip.
Comparative example 65 Kg of fluororubber
3021 instead of 30kg of fluororubber
3021 Using 30kg of fluororubber in example 6
3021 compared with the fluororubber composition, the dynamic friction coefficient is increased by 51.22% and the static friction coefficient is increased by 53.49%, resulting in slip.
Therefore, after the white carbon black R972 or R974 is added into the total raw materials for preparing the fluororubber composition, when the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30), the finally prepared fluororubber composition has small dynamic friction coefficient and static friction coefficient, and the phenomenon of sliding is avoided. On the contrary, the raw materials outside the above range, the dynamic friction coefficient and the static friction coefficient of the finally obtained fluororubber composition increase, and the phenomenon of slip occurs.
In comparative example 7, in which 0.6kg of vulcanizing agent FRD101 and 1.8kg of crosslinking agent TAIC-100 were used instead of 0.8kg of vulcanizing agent FRD101 and 2.4kg of crosslinking agent TAIC-100, the coefficient of dynamic friction was relatively increased by 17.07% and the coefficient of static friction was relatively increased by 27.91% compared with the fluororubber composition prepared in example 6 using 0.8kg of vulcanizing agent FRD101 and 2.4kg of crosslinking agent TAIC-100.
Therefore, the fluororubber composition prepared by 0.2-1.2 parts of vulcanizing agent and 2.4-3.6 parts of crosslinking agent in the total raw materials prepared from the fluororubber composition has lower dynamic friction coefficient and static friction coefficient. On the contrary, the raw materials outside the above range, the dynamic friction coefficient and the static friction coefficient of the finally obtained fluororubber composition increase, and the phenomenon of slip occurs.
Examples 14 to 18
A fluororubber composition which differs from example 6 in that each component and the corresponding weight are shown in Table 9.
TABLE 9 test results of example 6 and examples 14 to 18
The fluororubber compositions obtained in examples 14 to 18 were examined for the static friction coefficient, the dynamic friction coefficient and the occurrence of the slip phenomenon, and the examination results are shown in Table 10.
TABLE 10 test results of example 6 and comparative examples 14 to 18
As is clear from the analysis of the respective performance test data in Table 10, the fluororubber compositions obtained in examples 14 to 17 of the present application had a dynamic friction coefficient of 0.39 to 0.45 and a static friction coefficient of 0.45 to 0.53, and were free from the phenomenon of slip.
Comparing the properties of the fluororubber composition prepared in example 14 with those of the fluororubber composition prepared in example 6, it can be seen that the fluororubber composition prepared in example 14 has a relative decrease in the coefficient of dynamic friction of 2.44% and a relative increase in the coefficient of static friction of 4.65%.
Comparing the properties of the fluororubber composition prepared in example 15 with those of the fluororubber composition prepared in example 6, it can be seen that the fluororubber composition prepared in example 15 has a relative increase in the coefficient of dynamic friction of 14.63% and a relative increase in the coefficient of static friction of 23.26%.
Comparing the properties of the fluororubber composition obtained in example 16 with those of the fluororubber composition obtained in example 6, it can be seen that the fluororubber composition obtained in example 16 has a relative decrease in the coefficient of dynamic friction of 4.88% and a relative increase in the coefficient of static friction of 9.30%.
Comparing the properties of the fluororubber composition obtained in example 17 with those of the fluororubber composition obtained in example 6, it can be seen that the fluororubber composition obtained in example 16 has a relative increase in the coefficient of dynamic friction of 9.76% and a relative increase in the coefficient of static friction of 13.95%.
Thus, it is shown that the addition of the release agent HT290 to the total raw materials for the preparation of the fluororubber compositions of the present application is effective in reducing the coefficient of dynamic friction. When the amounts of the mold release agent, the crosslinking agent and the vulcanizing agent are increased, the amount of the fluororesin can be reduced, and the coefficient of dynamic friction and the coefficient of static friction can be reduced to some extent.
Comparing the properties of the fluororubber composition obtained in example 18 with those of the fluororubber composition obtained in example 15, it can be seen that the fluororubber composition obtained in example 18 has a relative increase in the coefficient of dynamic friction of 42.55% and a relative increase in the coefficient of static friction of 33.96%. Therefore, the addition of the release agent HT290 and the white carbon black R974 in the total raw materials for preparing the fluororubber composition has a good compounding effect, and the dynamic friction coefficient and the static friction coefficient of the fluororubber composition can be effectively reduced.
Example 19
A fluororubber composition which is different from the fluororubber composition of the embodiment 6 in that except for the preparation process S1, the temperature of an internal mixer is 60 ℃, the rotating speed is 15r/min, and the mixing time is 2 min; in the preparation process S2, the temperature of the internal mixer is 80 ℃, the rotating speed is 20r/min, and the mixing time is 8 min; in the preparation process S3, the temperature of the internal mixer is 60 ℃, the rotating speed is 20r/min, the mixing time is 6min, and the rest is the same as that of the example 6.
Example 20
A fluororubber composition which is different from the fluororubber composition of the embodiment 6 in that except for the preparation process S1, the temperature of an internal mixer is 70 ℃, the rotating speed is 25r/min, and the mixing time is 4 min; in the preparation process S2, the temperature of the internal mixer is 100 ℃, the rotating speed is 40r/min, and the mixing time is 12 min; in the preparation process S3, the temperature of the internal mixer is 80 ℃, the rotating speed is 40r/min, the mixing time is 10min, and the rest is the same as that of the example 6.
The fluororubber compositions obtained in examples 19 to 20 were examined for the static friction coefficient, the dynamic friction coefficient and the occurrence of the slip phenomenon, and the examination results are shown in Table 11.
TABLE 11 test results of examples 19 to 20
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A fluororubber composition characterized by comprising a fluororubber P757 and a fluororesin;
the fluororesin is one or more of PTFE500, Miflon 3021, F-104, FL2032 and FL 2100;
the weight ratio of the fluororubber P757 to the fluororesin is 100 (15-30).
2. The fluororubber composition according to claim 1, wherein the fluororesin is Miflon 3021.
3. The fluororubber composition according to claim 1 or 2, wherein the weight ratio of the fluororubber P757 to the fluororesin is 100: 30.
4. The fluororubber composition according to claim 1, comprising the following components in parts by weight:
757100 parts of fluororubber;
15-30 parts of fluororesin;
10-15 parts of white carbon black;
0.8-1.2 parts of a vulcanizing agent;
2.4-3.6 parts of a cross-linking agent.
5. The fluororubber composition according to claim 4, wherein the weight ratio of the vulcanizing agent and the crosslinking agent is 1: 3.
6. The fluororubber composition according to claim 4, further comprising 0.5 to 1 part of a release agent HT 290.
7. The fluororubber composition according to claim 4, wherein said white carbon is any one of R972 and R974.
8. A process for producing a fluororubber composition according to any one of claims 4 to 7, characterized by comprising the steps of:
mixing the fluororubber for 2-4min at 60-70 ℃ and with the rotation speed set to 15-25 r/min; under the conditions that the temperature is 80-100 ℃ and the rotating speed is set to be 20-40r/min, then the white carbon black, the cross-linking agent, the fluororesin and the fluororubber are mixed for 8-12min to obtain mixed rubber; adding a vulcanizing agent into the rubber compound at the temperature of 60-80 ℃ and the rotating speed of 20-40r/min, mixing for 6-10min, and pulling for 5-7 times to obtain the rubber.
9. The method for producing a fluororubber composition according to claim 8, wherein 0.5 to 1 part by weight of a release agent HT290 is added to the mixture during kneading of the white carbon, the crosslinking agent, and the fluororesin with the fluororubber.
10. Use of a fluororubber composition according to any one of claims 1 to 7 in dynamic seals.
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| JP2017019263A (en) * | 2015-07-07 | 2017-01-26 | 上海交通大学 | Production method for fluorocarbon resin composite body, and molded body production method |
| WO2021099336A1 (en) * | 2019-11-22 | 2021-05-27 | Solvay Specialty Polymers Italy S.P.A. | Method for improving coefficient of friction in cured fluororubber parts |
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