Polyfoam using plant fiber as material and its preparation method
A technology of plant fibers and foam plastics, applied in the field of foam plastics and its preparation, can solve the problems of unsuitable economy, increased environmental burden, and increased liquefaction cost, and achieve the effects of improving liquefaction efficiency, low cost, and reducing pollution
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Embodiment 1-5
[0017] The preparation steps are:
[0018] 1), preparation of liquefied plant fiber:
[0019] Raw materials: 40 mesh pine wood powder, phenol as solvent. Reaction temperature: 150°C, reaction time: 90min. Feeding method: one-time addition or divided into two additions (first add 2 / 3, then add 1 / 3), the results of the liquefaction reaction are shown in Table 1. Metal chloride salts are penetrating agents, which can enhance the diffusion of phenol in plant fibers and increase the probability of reaction. Adding pine wood powder in batches can increase the proportion of solvent in the initial reaction system, which is beneficial to the liquefaction of plant fibers.
[0020] 2), preparation of lignocellulosic base resole phenolic resin:
[0021] Get each example liquefied pine wood as raw material, after measuring the phenolic hydroxyl value of liquefied wood, phenol: formaldehyde=1: 1.6; Catalyst NaOH consumption accounts for 1% of phenol. Weigh the above-mentioned liquefied...
Embodiment 6~9
[0028] The preparation method is the same as that of Examples 1-5. However, before the original plant fiber is liquefied, the plant fiber powder is subjected to ultraviolet radiation pretreatment for different periods of time using ultraviolet lamps of different powers. The specific method is as follows: raw materials: 40 mesh pine wood powder, phenol as solvent, pine wood powder / phenol=1. During ultraviolet treatment, the distance between pine wood powder and ultraviolet lamp is: 20cm; reaction temperature: 100°C, reaction time: 90min; catalyst: 1% sulfuric acid, 5% p-toluenesulfonic acid, 1% stannous chloride; The way of adding pine wood powder: one-time addition; the results of liquefaction reaction are shown in Table 2. Ultraviolet light irradiation may accelerate the degradation of lignin, thereby improving the liquefaction performance of plant fibers. It can also be seen from Table 2 that with the increase of the power of the ultraviolet lamp, the liquefaction performa...
Embodiment 10-11
[0031] The preparation method is the same as that of Examples 1-5. However, prior to liquefaction, the raw plant fibers are pretreated with gamma rays or gamma rays combined with ultraviolet radiation. The specific method is as follows: raw materials: 40 mesh pine wood powder, phenol as solvent, pine wood powder / phenol=1. After irradiating the pine wood powder with different doses of gamma rays, and then irradiating it with a 2000W ultraviolet lamp, the distance between the pine wood powder and the ultraviolet lamp is: 20cm, and the irradiation time is 10 hours; the reaction temperature is 100°C, the reaction time is 90min; the catalyst is : 1% sulfuric acid, 5% p-toluenesulfonic acid, 1% stannous chloride; the addition method of pine wood powder: one-time addition; specific reaction results are shown in Table 3. Pine flour by Co 60 After irradiation, the chemical structure of the lignocellulosic material will change, and the high-energy radiation will destroy the crystallin...
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