Special-type sealing wax

[0032] The preparation method of special sealing wax of the present invention comprises following concrete steps (as figure 1 shown):

[0033] Step 1 (i.e. the first stage), put paraffin wax and polyethylene wax in the first blending kettle according to the ratio of the above raw materials, stir and heat, at 130°C, the stirring speed is 70 rpm, and mix for 1 hour to obtain the first stage mixture ;

[0034] Step 2 (that is, the second stage), stir and heat the microcrystalline wax and beeswax in the second blending kettle according to the above raw material ratio, at 100°C, the stirring speed is 50 rpm, and mix for 0.5h to obtain the second stage mixture ;

[0035] Step 3 (that is, the third section), add the first-stage mixture obtained in step 1 and the second-stage mixture obtained in step 2 into the third blending tank and stir and heat, at 120°C, the stirring speed is 60- 70 revs/min, mix 1h, obtain the third stage mixture;

[0036] Step 4 (that is, the fourth stage), and then add the third-stage mixture obtained in step 3 together with the tackifier into the fourth blending tank and stir and heat, at 100 ° C, the stirring speed is 40-50 rpm, mix After 0.5h, cool down naturally, form, and pack to obtain the finished product of special sealing wax of the present invention.

[0037] The present invention selects segmental blending, and each segment adopts different processing temperatures and stirring speeds. As shown in Table 2, for the same raw materials, under the same proportioning conditions, the performance comparison of the products prepared by the four-stage process of the present invention and the one-stage, two-stage, and three-stage processes of the prior art. Among them, the formula is as follows (by weight): 76 parts of No. 64 fully refined paraffin wax, 12 parts of No. 80 refined microcrystalline wax, 6 parts of white beeswax, 5 parts of WE-3 polyethylene wax, and 1 part of LAN603 type tackifier . The test of the performance index adopts the internationally common American ASTM test method.

[0038] Table 2: Under the condition of the same raw materials and the same proportion, the comparison of different feeding methods

[0039]

[0040] One-stage processing is to add all the ingredients into a blending tank, heat and stir to form a mixed solution. The test shows that the processing cycle is long, the yield is low (hardness is reduced), resulting in high energy consumption for processing, and the quality cannot meet the target requirements, as shown in Table 2. . And, adopt two-stage, three-stage processing method, its result quality index also can't meet the requirement. By adopting the four-stage processing method of the present invention, the quality can reach the index requirement, and it is easier to control within the index requirement range. Repeated tests have shown that the quality index is all within the standard requirement range; and the production cycle is short, the operation is convenient, and the yield high.

[0041] Through experiments, it is found that the reaction temperature, stirring speed and mixing time also have an impact on the quality index under the same material ratio. In the same section (such as step 4, the fourth section) of processing, the reaction temperature and stirring speed have an impact on the oil content: when the heating temperature is greater than 100°C or the stirring speed is greater than 50r/min, the oil content will increase and affect the quality Index; when the stirring speed is lower than 40r/min, the mixture is not fully fused, which also affects the quality (at the same temperature). It has been proved by experiments that the heating temperature in the fourth stage is controlled at 100°C, the stirring speed is controlled at 40-50r/min, and the reaction period is 0.5h.

[0042] Further, in the same section of processing (such as step 4, the fourth section), under the same heating time, the reaction temperature and stirring speed have an impact on the melting point: under the same heating time, the rotation speed is 40r/min , the melting point rises before the temperature is 100°C, when the stirring speed is >50r/min, and the heating temperature is above 110°C, the melting point tends to decrease, resulting in an inflection point of melting point change. It can be seen that the stirring speed is ideal at 40-50r/min; at this speed state, the heating temperature is preferably controlled at 100°C. At this time, the viscosity of the tackifier is better, and the viscosity will decrease if the temperature is higher than 100°C. .

[0043] Using the same method as above, it has been verified by experiments: the ideal mixing time for the first stage is 1h, the stirring speed is 70 rpm, and the heating temperature is 130°C. Because the melting point of paraffin wax and polyethylene wax is high, it can only be mixed under this temperature condition. Complete fusion, when the temperature is lower than 130°C, the miscibility of paraffin wax and polyethylene wax is not good; the ideal mixing time for the second stage is 0.5h, the stirring speed is 50 rpm, and the heating temperature is 100°C, because when the temperature is higher ( For example, when the temperature is as high as 130°C), the acid in the beeswax will be destroyed, resulting in a decrease in the moisture resistance of the product; the ideal mixing time for the third stage is 1 hour, the stirring speed is 60-70 rpm, and the heating temperature is 120°C.

[0044] In the embodiment of the present invention, different materials form processing sections according to their different properties, the purpose is to shorten the processing period and not to change the structure of the materials to ensure that their performance characteristics remain unchanged.

[0045] Embodiment 2-3 and comparative example 4-8

[0046] Using the four-stage processing technology of the present invention, the sealing wax is prepared by feeding according to the ratio in Table 3, and the performance test is carried out.

[0047] Table 3: Feeding situation and performance test of embodiment 2-3 and comparative example 4-8

[0048]

[0049] In some embodiments of the present invention, it is shown that the addition amount of polyethylene wax has a certain relationship with the melting point of the sealing wax product: when the addition amount is at 1-3%, the melting point rises faster, and when the addition amount is at 3-4% When the melting point rises relatively steadily, when the addition amount is 5-5.5%, the melting point can meet the requirements. But when the addition amount exceeds 5.5%, the melting point shows a downward trend.

[0050] In some embodiments of the present invention, experiments have shown that low molecular weight polyethylene wax should be selected to avoid wax cracking in low temperature environments. When the addition amount is 5-5.5%, the melting point can reach the target, and has no effect on other performance indicators.

[0051] It is determined that the comprehensive performance index of the sealing wax product obtained in the present invention is better than that of 602 special wax. It can also be used in optical fiber cable communication and oil pipeline sealing materials.