Study of Heat-Resistant Cotton Stalk Bast Fibers Reinforced Polylactic Acid Composites

2012 ◽  
Vol 583 ◽  
pp. 53-56 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Wang Xiao
Keyword(s):  
Heat Resistance ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Processing Condition ◽  
Cotton Stalk ◽  
Molding Temperature ◽  
Bast Fibers ◽  
Optimal Processing ◽  
Good Heat Resistance ◽  
Good Heat

The heat-resistance of PLA is so poor that its application area was limited. It can be widely applied after improvement. In the process of making cotton stalk bast fibers reinforced PLA composites, adding TAIC a type of cross-linking agent in the experiment produces a kind of composites with good heat-resistance. Orthogonal experiment table including length and mass fraction of fibers, molding temperature and addition of TAIC was devised. Then the study focused on the heat-resistance of the composites and the analysis of range and variance were done. The optimal processing condition was obtained: length of fibers was 10mm, mass fraction of fibers was 30%, molding temperature was 175°C and addition of TAIC was 1%. In addition, fibers reinforced PLA composites without TAIC had better heat-resistance than the pure PLA material, the HDT raised 54°C, and the composites added TAIC obtained the best heat-resistance of all. This composite can be extensively used in many fields.

Study of Flame-Retardant Cotton Stalk Bast Fibers Reinforced Polylactic Acid Composites

2012 ◽  
Vol 583 ◽  
pp. 228-231 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Wang Xiao
Keyword(s):  
Flame Retardant ◽  
Mass Fraction ◽  
Flame Retardants ◽  
Orthogonal Experiment ◽  
Processing Condition ◽  
Cotton Stalk ◽  
Molding Temperature ◽  
Flame Retardant Property ◽  
Bast Fibers ◽  
Optimal Processing

As PLA composites are easy to kindle, making flame-retardant composites is particularly important. PLA can be widely used after improvement. In the process of making cotton stalk bast fibers reinforced PLA composites, adding APP/PER a type of flame-retardants in the experiment produces a kind of composites with good flame-retardant property. Orthogonal experiment table including length and mass fraction of fibers, molding temperature and addition of flame-retardants was devised. Then the study focused on the flame-retardant property of the composites and the analysis of range and variance were done. The optimal processing condition was obtained: length of fibers was 8mm, mass fraction of fibers was 30%, molding temperature was 175°C and addition of flame-retardants was 10%. Fibers reinforced PLA composites with APP/PER got better flame-retardant property than the composites without APP/PER, with the LOI rising 6.61. This kind of composite can be extensively applied in many fields.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polypropylene Composites

2012 ◽  
Vol 482-484 ◽  
pp. 929-932 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Li Hua Lv
Keyword(s):  
Mechanical Properties ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Matrix Material ◽  
Processing Condition ◽  
Molding Pressure ◽  
Cotton Stalk ◽  
Cold Forming ◽  
Molding Temperature ◽  
Bast Fibers

The cotton stalk bast fibers are a new kind of natural cellulose fibers, which have the similar properties as the flax fibers. Polypropylene (PP) is a type of matrix material and commonly used in composites. The cotton stalk bast fibers as reinforced materials and PP as matrix were used to make a new kind of composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including mass fraction of fibers, molding temperature, molding pressure and molding time was devised. Then the flexural strength, tensile strength and impact strength were tested and the analysis of range was done. The optimal processing condition was obtained as follows: mass fraction of fibers was 30%, molding temperature was 190°C, molding pressure was 12MPa and molding time was 480s. The result showed that the cotton stalk bast fibers reinforced PP composites had good mechanical properties.

Effect of Boronizing Treatment on the Conductivity of a High-Conductivity and Heat-Resisting Al-Zr Alloy Conductor Material

2021 ◽  
Vol 1035 ◽  
pp. 83-88
Author(s):  
Zhi Kai Zheng ◽  
Xiang Xiao ◽  
Hao Wu ◽  
Hong Ying Li ◽  
Pi Zhi Zhao
Keyword(s):  
Heat Resistance ◽  
Mass Fraction ◽  
Transition Element ◽  
High Conductivity ◽  
Transition Elements ◽  
Heat Resistant ◽  
Good Heat Resistance ◽  
Good Heat ◽  
State Form ◽  
Zr Alloy

The effect of boronizing treatment on the conductivity of a high-conductivity and heat-resistant Al-Zr alloy conductor material was studied. The results showed that the conductivity of industrial pure Al containing transition element (Ti, V, Cr, Mn)>0.01 wt % (mass fraction, the same below) was improved to a certain extent by using boronizing treatment to remove transition metal elements through the formation of borides. Using the boronizing treatment, B can react with transition elements to form blocky (Ti, V, Fe)B2 and flocculent (Ti, V, Fe, Zr)B2. The boronizing treatment makes Ti and V out of the solid solution state, form borides and finally deposit to the bottom of the furnace, thus significantly improving the conductivity of the ingot. In addition, Cr and Mn were not found in the borides at the bottom of the furnace. However, for the high-conductivity and heat-resisting Al-Zr alloy conductor material, B will have poison effects on Zr during boronizing treatment, thus reducing the heat-resistance of the alloy. Therefore, in the preparation process of high-conductivity and heat-resistant Al-Zr alloy conductor material, the converter process should be added after boronizing treatment to ensure that the Al-Zr alloy conductor material has good heat-resistance and conductivity at the same time.

scholarly journals Silicone Resin-Based Intumescent Paints

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4785
Author(s):  
Maria Zielecka ◽  
Anna Rabajczyk ◽  
Krzysztof Cygańczuk ◽  
Łukasz Pastuszka ◽  
Leszek Jurecki
Keyword(s):  
Heat Resistance ◽  
Expanded Graphite ◽  
Steel Structures ◽  
Silicone Resin ◽  
Hydroxyl Groups ◽  
The Novel ◽  
Coating Materials ◽  
Good Heat Resistance ◽  
Good Heat

Silicone resins are widely applied as coating materials due to their unique properties, especially those related to very good heat resistance. The most important effect on the long-term heat resistance of the coating is connected with the type of resin. Moreover, this structure is stabilized by a chemical reaction between the hydroxyl groups from the organoclay and the silicone resin. The novel trends in application of silicone resins in intumescent paints used mostly for protection of steel structures against fire will be presented based on literature review. Some examples of innovative applications for fire protection of other materials will be also presented. The effect of silicone resin structure and the type of filler used in these paints on the properties of the char formed during the thermal decomposition of the intumescent paint will be discussed in detail. The most frequently used additives are expanded graphite and organoclay. It has been demonstrated that silicate platelets are intercalated in the silicone matrix, significantly increasing its mechanical strength and resulting in high protection against fire.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polylactic Acid Biodegradable Composites

2011 ◽  
Vol 399-401 ◽  
pp. 1367-1371
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Zhi Fang Tian
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Mass Fraction ◽  
Molding Pressure ◽  
Molding Temperature ◽  
Bast Fibers ◽  
Flax Fibers ◽  
Biodegradable Composites ◽  
Cotton Stalks ◽  
Reinforced Materials

The cotton stalks bast fiber was a new kind of natural cellulose fiber, the fibers had the similar properties as the flax fibers. Polylactic acid (PLA) is a class of biodegradable matrix material. As the flax fibers can be reinforced materials and then compounded with PLA, cotton stalks bast fibers as reinforced materials and PLA as matrix were used to make a kind of green and biodegradable composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including length of the fibers, mass fraction of PLA, molding temperature and molding pressure was devised. Then the tensile strength, flexural strength and impact strength were tested and the analysis of range and variance was done. The optimal processing condition was obtained as follows: length of the fibers was 6mm, mass fraction of PLA was 75%, molding temperature was 175°C and molding pressure was 12MPa. The result showed that the cotton stalks bast fibers reinforced PLA biodegradable composites had good mechanical properties. Through this study waste cotton stalks basts were turned into useful resources and provided a kind of environmentally friendly composites.

Synthesis of Tung Oil-Based Bi-Dihydrogen-Maleimide

2012 ◽  
Vol 554-556 ◽  
pp. 787-791
Author(s):  
Jin Hua Zhou ◽  
Xun Jun Du ◽  
Han Zhou Sun ◽  
Yu Xiong Wu ◽  
Xiao Feng Tan ◽  
...  
Keyword(s):  
Heat Resistance ◽  
Polymeric Materials ◽  
Decomposition Temperature ◽  
Target Product ◽  
Optimal Conditions ◽  
Initial Decomposition Temperature ◽  
Tung Oil ◽  
Renewable Biomass ◽  
Good Heat Resistance ◽  
Good Heat

Started from Tung oil, a renewable biomass material of china, a new kind of bismaleimide, Tung oil-based bi-dihydrogen-maleimide (TOBBDHMI) was synthesized by the reaction of methyl-α-eleostearate-maleic anhydride adduct (MEMAA) and 4,4'-diphenylmethane disocyanate (MDI). The optimal conditions for synthesis were catalyst triethylamine dosage 1.0%, mole ratio of MEMAA to MDI 2.4:1, reaction temperature 75°C and reaction time 2 h, which gave yield 82.4% for TOBBDHMI (calculated from MDI). The melting point of the product was 186.6 °C~189.3 °C, initial decomposition temperature was 270 °C and final decomposition temperature was 510 °C, which showed the product has good heat resistance. The target product is potential to be used alone or with other bismaleimide monomers to improve polymeric materials’ heat resistance and/or mechanical properties.

Filler Effect on the Heat Stability of Vulcanized Elastomeric Compositions

1973 ◽  
Vol 46 (4) ◽  
pp. 927-937 ◽  
Author(s):  
M. Q. Fetterman
Keyword(s):  
Elevated Temperature ◽  
Carbon Black ◽  
Heat Resistance ◽  
Elevated Temperatures ◽  
Heat Stability ◽  
Rubber Compound ◽  
Hydrated Silica ◽  
Serviceable Life ◽  
Good Heat Resistance ◽  
Good Heat

Abstract The purpose of this study was to determine filler effects on heat stability of vulcanized elastomeric compositions. Carbon-black reinforced compounds, designed to have good heat resistance, were modified by substituting hydrated silica for all or part of the black. Since a simple replacement of silica for black would result in dissimilar original properties, the substituted compounds were further revised to minimize this dissimilarity. This was accomplished through curative correction and/or addition of an organosilane coupling agent. Silica substitution did not provide permanency of properties at elevated temperatures, but in all cases the serviceable life of the compound was extended. Since silica substitution had minimum effect on other properties and reduced the rate of degradation at elevated temperature, this may be considered a reasonable alternative to completely redesigning a proven rubber compound in order to improve its heat resistance.

Synthesis and Heat Resistance of Arylenedioxy-organosilanylene Polymers with Adamantane Units

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1567-1570
Author(s):  
Takayuki Maehara ◽  
Hiroshi Hashimoto ◽  
Joji Ohshita
Keyword(s):  
Weight Loss ◽  
Thermogravimetric Analysis ◽  
Heat Resistance ◽  
Good Heat Resistance ◽  
Good Heat

Arylenedioxy-organosilanylene polymers with adamantane units in the backbone were prepared by Rh-catalyzed dehydrocoupling of bis(4-hydroxyphenyl)adamantanes with organohydrosilanes, and their heat resistance was evaluated by thermogravimetric analysis in nitrogen. Among these polymers, the highest Td10 (10% weight loss temperature) of 547 °C was achieved for polymer 2a prepared from 1,3-bis(4-hydroxyphenyl)adamantane and phenylsilane. Polymer 2a exhibited good heat resistance even in air with Td10 = 387 °C, and standing of the polymer at 150 °C for 8 h resulted in no evident weight loss

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