Jiangxi San Yue new Material Co., Ltd
Qiaonan industrial park, Yongfeng County, Jian City, Jiangxi Province, China 331500
T: +86 0796 2272555
F: +86 0796 2218737
The varieties of auxiliaries are great and their performance is very different. Only when they are used properly can the effect be highlighted. This is the question of selecting the auxiliaries carefully, reasonably and correctly.
(1) the compatibility of auxiliaries with adhesives
The compatibility of additives refers to the compatibility, dispersion and stability of the polymers with the adhesives, otherwise it will precipitate (spray or migration) or precipitate inorganic filler, which makes the function of the auxiliaries difficult to show. Therefore, various auxiliaries must be compatible with adhesives, process formulations and preparation conditions in order to give full play to their effectiveness. For most auxiliaries, the long-term, uniform and stable presence in the adhesive system is the fundamental guarantee for its lasting utility. Of course, there are some additives that play a role in the use of limited compatibility, for example, surfactants added antistatic agents.
(2) the amount of auxiliaries should be appropriate
The amount of auxiliaries should be suitable, many of which are not good, and few can not be achieved. The optimum quantity should be determined according to the varieties of auxiliaries and the performance requirements of adhesives. Some auxiliaries are less effective than others, resulting in better performance. Some auxiliaries are more expensive and cost less, resulting in obvious economic benefits. The dosage and addition method of the additives are very important, and the different adhesives system is very different. The different addition methods are also the prerequisite to ensure the full use of the effectiveness of the additives.
(3) synergistic effect and antagonism of additives in mixed use
Generally speaking, the effect of 2 or more than 2 different additives is higher than that of the same additive, which is called "synergistic effect" or "synergistic effect". For example, when the antioxidant and UV absorber are used together, it can be used in polyurethane adhesives (adding 0.1% to 0.5%). The antioxidant 616 (CY666) is more effective than phosphite antioxidant. After matching with different auxiliaries, the effect is lower than that of a single assistant, which is called "antagonistic effect" or "antagonistic effect". For example, the hindered amine light stabilizer (HALS), because of its height and alkalinity, produces an insoluble salt when it is combined with acid auxiliaries. It can not be regenerated as a nitrogen oxygen radical, so the effect of its light stabilization is largely inferior, showing a antagonistic effect. Therefore, when different auxiliaries are used together, special attention should be paid to the synergy effect and antagonistic effect. We should give full play to the synergy effect and avoid the antagonistic effect. .
(4) consideration of the adaptability of process conditions
The auxiliaries used for adhesives must be suitable for the technological conditions of synthesis and preparation, and should not decompose, volatilize or sublimate at high temperatures. The antioxidants used for hot melt adhesives and hot melt pressure sensitive adhesives must be sufficiently heat-resistant, otherwise the efficiency of the auxiliaries will be lost or weakened.
(5) pay attention to the environmental protection of auxiliaries.
The choice of auxiliaries should be guided by the concept of environmental protection. If the additives with better performance are not environmentally friendly, they can only discard them. We must choose, do not have "three", no allergy, no irritation, no pollution auxiliaries.