خصوصيات مكانيكي پانل ساندويچي سبك ساخته شده از خاك اره و ضايعات لاستيك

mechanical properties of light weight sandwich panel made of sawdust and waste rubber

در اﯾﻦ ﺗﺤﻘﯿﻖ از ﭼﺴﺐ اوره/ ﻣﻼﻣﯿﻦ ﻓﺮﻣﺎﻟﺪﻫﯿﺪ ﺑﺎ ﻧﺴﺒﺖﻫﺎي ﻣﺨﺘﻠﻒ )10:90، 20:80 و 30:70( ، ﺧﺎك اره و ﺿﺎﯾﻌﺎت ﻻﺳﺘﯿﮏ ﺑﺎ ﻧﺴﺒﺖ اﺧﺘﻼط )10:90 ،0:100 و 20:80( و دﻣﺎي ﭘﺮس )170 ،160 و 180 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد( ﭘﺎﻧﻞﻫﺎي ﺳﺎﻧﺪوﯾﭽﯽ ﺳﺒﮏ ﺳﺎﺧﺘﻪ ﺷﺪﻧﺪ. ﻫﻤﭽﻨﯿﻦ ﻻﯾﻪ ﺻﻨﻮﺑﺮ 2 ﻣﯿﻠﯽﻣﺘﺮي روي ﺳﻄﻮح ﭘﺎﻧﻞ ﭘﺮس ﺷﺪﻧﺪ. آزﻣﻮنﻫﺎي ﻣﻘﺎوﻣﺖ ﺧﻤﺸﯽ، ﻣﺪول اﻻﺳﺘﯿﺴﯿﺘﻪ، ﭼﺴﺒﻨﺪﮔﯽ داﺧﻠﯽ و ﻣﻘﺎوﻣﺖ ﺑﻪ ﻓﺸﺎر ﻣﻮازي اﻟﯿﺎف ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺮ اﺳﺎس اﺳﺘﺎﻧﺪارد ASTM آﯾﯿﻦ ﻧﺎﻣﻪ D1037 ، C393 و C364اﻧﺠﺎم ﺷﺪ. ﻧﺘﺎﯾﺞ آزﻣﻮنﻫﺎي ﻣﮑﺎﻧﯿﮑﯽ ﺗﻮﺳﻂ ﺗﺠﺰﯾﻪ وارﯾﺎﻧﺲ و ﮔﺮوهﺑﻨﺪي ﻣﯿﺎﻧﮕﯿﻦﻫﺎ ﺑﺎ آزﻣﻮن ﭼﻨﺪ داﻣﻨﻪاي داﻧﮑﻦ ﺑﺎ ﺳﻄﺢ اﻃﻤﯿﻨﺎن 95 درﺻﺪ از ﻧﻈﺮ آﻣﺎري ﺗﺠﺰﯾﻪ و ﺗﺤﻠﯿﻞ ﺷﺪﻧﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﮐﻪ ﺑﯿﺸﺘﺮﯾﻦ ﻣﻘﺪار ﺧﻮاص ﻣﮑﺎﻧﯿﮑﯽ ﭘﺎﻧﻞﻫﺎي ﺳﺎﻧﺪوﯾﭽﯽ در دﻣﺎي 170 درﺟﻪ ﺳﺎﻧﺘﯽﮔﺮاد ﺑﻮد. اﻓﺰودن 30 درﺻﺪ رزﯾﻦ ﻣﻼﻣﯿﻦ ﻓﺮﻣﺎﻟﺪﻫﯿﺪ ﻣﻮﺟﺐ اﻓﺰاﯾﺶ ﺣﺪاﮐﺜﺮي ﺧﻮاص ﻣﮑﺎﻧﯿﮑﯽ ﺷﺪ. اﻓﺰاﯾﺶ ﻣﯿﺰان ﻻﺳﺘﯿﮏ ﺗﺎ 10 درﺻﺪ ﻣﻮﺟﺐ اﻓﺰاﯾﺶ ﺣﺪاﮐﺜﺮي ﻣﻘﺎوﻣﺖ ﻓﺸﺎري، ﻣﻘﺎوﻣﺖ ﺧﻤﺸﯽ و ﭼﺴﺒﻨﺪﮔﯽ داﺧﻠﯽ ﺷﺪ و ﺗﺨﺘﻪﻫﺎي ﻓﺎﻗﺪ ﻻﺳﺘﯿﮏ ﺣﺪاﮐﺜﺮ ﻣﺪول اﻻﺳﺘﯿﺴﯿﺘﻪ را دارا ﺑﻮدﻧﺪ.

In this research, urea melamine formaldehyde resin with the different ratio (90:10, 80”20 and 70:30) of sawdust and rubber waste with the ratio (100:0, 90:10, 80:20) and press temperature (160, 170 and 180 oC) sandwich panels was made. Populous layers with 2 mm thickness also were pressed on the surface of the panels. Flexural strength, modulus of elasticity, internal bonding and compression parallel to the grain tests were used in accordance with the ASTM standard C393, D1037 and C364, respectively. The results of the mechanical tests were analyzed by analysis of variance and averages of groups with Duncan's multiple range test with 95% confidence level. The results showed that the temperature of 170 ° C was the best temperature in terms of mechanical properties of sandwich panels. Addition of 30% melamine formaldehyde resin increased the mechanical properties. Increasing the rubber up to 10% resulted in a maximum increase in compressive strength, flexural strength and internal bonding, and the samples without rubber increased the maximum elasticity modulus.