CN114734693B - 一种高阻尼降噪竹纤维砧板及其制备方法 - Google Patents
一种高阻尼降噪竹纤维砧板及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种高阻尼降噪竹纤维砧板制备方法,该方法为:在模具中按照一定的顺序铺装竹纤维砧板的板坯,并在板坯内预留孔道,然后对模具的内腔抽真空,将改性胶黏剂注入模具内腔用于浸润板坯,旋转离心,将改性胶黏剂均匀地浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间进行板坯定型,然后向预留孔道内注入聚氨酯发泡预聚体发泡压缩后,经修边、抛光、烙印和涂植物油后,获得高阻尼降噪竹纤维砧板成品。本发明将竹纤维进行分散制作成一定形状的竹纤维毡,采用板坯预成型体铺装、真空辅助改性施胶、模具离心定型、注射微发泡填充等方式,实现具有高阻尼特征和吸声降噪的竹纤维砧板制造。
Description
技术领域
本发明属于砧板技术领域,具体涉及一种高阻尼降噪竹纤维砧板及其制备方法。
背景技术
目前,竹砧板通常是利用竹条或者展平竹板直接压制而成,在制作过程中,竹材多以脲醛树脂为胶黏剂,热压胶合而成,制作方法工序复杂,刨削量大,竹材利用率和生产效率低。由于制作中需要较大的施胶量,而产品胶接面与食材直接接触难以避免,产品中残留的部分游离甲醛易污染食材和室内空气。最为重要的是现有的竹砧板为实心竹板,不具有降噪吸音的能力,竹砧板在使用时会因为振动而产生噪音,从而影响到他人的生活。
高阻尼材料是指阻尼本领较高的材料,可以解决因为振动而产生的噪音,通过使用高阻尼材料,将振动噪声抑制在发生源处。高分子阻尼材料是阻尼材料中最有效的一类,高分子材料的粘弹性是其在受到交变力场的作用下发生的位移滞后现象,产生的力学损耗是其产生阻尼作用的根本原因。当振动或噪音由基体传递到高分子材料时,由于分子链段间的内摩擦阻力,机械能部分转变为热能而散失,起到阻尼效果。高分子阻尼材料的减振降噪性能主要取决于所选用的树脂基料、功能填料的种类以及改性的方法。
发明内容
本发明所要解决的技术问题在于针对上述现有技术的不足,提供了一种高阻尼降噪竹纤维砧板制备方法。该制备方法将竹纤维进行分散制作成一定形状的竹纤维毡,采用板坯预成型体铺装、真空辅助改性施胶、模具离心定型、注射微发泡填充等方式,实现具有高阻尼特征和吸声降噪的竹纤维砧板制造。
为解决上述技术问题,本发明采用的技术方案是:一种高阻尼降噪竹纤维砧板制备方法,其特征在于,该方法包括以下步骤:
步骤一、铺装竹纤维砧板的板坯:
筛选长度1-5cm的竹纤维,然后针刺梳理成厚度为5-10mm、密度为0.15-0.20g/cm3的竹纤维毡,作为竹纤维毡A;
在竹纤维毡A上加工出3-5个绕中心位置均匀分布的通孔,将加工好通孔的竹纤维毡A作为竹纤维毡B;
选择模具铺装竹纤维砧板的板坯,所述模具由上模具板、下模具板和模具框组成,所述上模具板和下模具板分别扣合在模具框的上开口和下开口处,所述模具框的侧边开设有注胶口、注料口和抽气口;
首先将所述模具框与下模具板固定,将树脂导流网铺设在所述模具框的内侧壁上,然后按照从下到上的顺序将1层竹单板、1层竹纤维毡A、4-7层竹纤维毡B、1层竹纤维毡A和1层竹单板组成板坯置于模具框中,所述板坯的长度为30-60cm,宽度为20-40cm,厚度为5-10cm,其中竹纤维毡A与竹纤维毡B的竹纤维方向垂直,然后扣合上模具板,固定上模具板和模具框;
组板坯时铺装的4-7层竹纤维毡B上每层分布的3-5个通孔竖向连通形成3-5个预留孔道,位于处于4-7层中间层的竹纤维毡B上预设有3-5个与所述预留孔道连通的支通道,所述支通道的数量与预留孔道的数量相同,所有支通道的一端汇聚连通在竹纤维毡B的中心位置,所有支通道的汇聚端通过导流管与注料口连通;所述支通道可以采用模压的方式获得;
步骤二、竹纤维毡改性施胶:对模具的内腔抽真空,然后从模具的注胶口将改性胶黏剂注入模具内腔用于浸润板坯,所述改性胶黏剂均匀地浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间,所述改性胶黏剂的施加量为所述板坯质量的20%-30%;
步骤三、板坯定型与注射微发泡填充:对步骤二中已注入改性胶黏剂的模具以垂直于板坯厚度方向的轴线为旋转轴进行旋转离心,优化板坯的层与层之间的结合状态,使得竹纤维砧板板坯的密度沿厚度方向呈现出中间低,两边高的状态,同时对模具进行预热,保持温度50℃,然后打开上模具板,经注料口将聚氨酯发泡预聚体注射到板坯的预留孔道和支通道中,取出导流管,然后闭合上模具板,压制上模具板压缩板坯的厚度至30%-40%,再加热模具至60℃,保持90s-120s,继续升温至100℃-110℃,保温3min,待板坯自然冷却后取出,得到竹纤维砧板粗产品;
步骤四、步骤三中得到的竹纤维砧板粗产品经修边、抛光、烙印和涂植物油后,获得高阻尼降噪竹纤维砧板成品。
优选地,步骤一中所述通孔的直径为2cm~5cm。
优选地,步骤一中4-7层竹纤维毡B的厚度为板坯厚度的60%-70%。
优选地,步骤二中所述改性胶黏剂的制备方法为:将脲醛树脂、柠檬酸三丁酯、二氧化硅按照质量比为100:(30~40):(10~15)混合,以1000~2000r/min的速度搅拌20~30min,得到混合物,然后加入中空微珠以500~1000r/min的速度搅拌60min,得到改性胶黏剂,所述中空微珠加入体积为所述混合物体积的20%~40%,所述改性胶黏剂在25℃时粘度280~300mPa·s。
优选地,步骤三中所述聚氨酯发泡预聚体的制备过程如下:将聚醚4110、聚醚210、硅油、双二甲氨基乙基醚、33%三亚乙基二胺的二丙二醇溶液、乙二醇、三乙醇胺、水、一氟二氯乙烷按照质量比900:100:1:0.2:1.5:4:0.3:4:12混合,搅拌搅匀,得到A组分,然后用异氰酸酯作为B组份与A组份按照质量比为(0.9~1.1):1搅拌均匀,制备成聚氨酯发泡预聚体。
优选地,步骤三中控制所述聚氨酯发泡材料注入量,调整所述竹纤维砧板粗产品的密度为0.45g/cm3~0.5g/cm3。
优选地,步骤三中旋转离心的转速为1500-3000r/min,离心的时间为2-5min,板坯的竹纤维毡的芯层和表层密度差10%-20%。
本发明还公开上述方法制备的高阻尼降噪竹纤维砧板。
本发明与现有技术相比具有以下优点:
1、本发明利用竹纤维毡表面粗糙有孔的结构特征,实现改性胶黏剂从周侧注入模具中,从竹纤维毡的微通道浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间,而且在注胶时在真空条件下,能够加快改性胶黏剂的渗入和渗入均匀性,保证板坯的后续定型需要。而且在改性胶黏剂属于凝胶态,未干透时,在板坯上预留3-5个预留孔道中注入聚氨酯发泡预聚体,然后压缩板坯增加板坯层间结合力,且发泡预聚体进行发泡填充后属于高阻尼材料,实现高阻尼特征和吸声降噪的竹纤维砧板的制造,并是砧板保持良好的弯曲性能和浸渍剥离性能。
2、本发明预留3-5个预留孔道绕板坯的中心位置对称设置,每个预留孔道的直径2-5cm,该结构设置既能提成高阻尼性能的聚氨酯发泡预聚体,又不会很大的影响砧板的结构强度。
3、本发明已注入改性胶黏剂的模具以垂直于板坯厚度方向的轴线为旋转轴进行旋转离心,使得竹纤维砧板板坯5的密度沿厚度方向呈现出中间低,两边高的状态,使得最后获得的砧板的上下两面的强度较高,能满足切菜时刀具对砧板的高强度要求。
下面通过附图和实施例对本发明的技术方案作进一步的详细说明。
附图说明
图1本发明实施例所用的装有板坯的模具的结构示意图。
图2本发明实施例所用的装有板坯的模具的结构示意图。
附图标记说明:
1—模具框;2—注胶口;3—抽气孔;4—注料口;5—板坯;6—预留孔道;7—支通道;8—导流管。
具体实施方式
实施例1
本实施例的一种高阻尼降噪竹纤维砧板制备方法包括以下步骤:
步骤一、铺装竹纤维砧板的板坯:
筛选长度2-4cm的竹纤维,然后针刺梳理成厚度为10mm、密度为0.18g/cm3的竹纤维毡,作为竹纤维毡A;
在竹纤维毡A上加工出3个绕中心位置均匀分布的通孔,所述通孔的直径为5cm,将加工好通孔的竹纤维毡A作为竹纤维毡B;
选择模具铺装竹纤维砧板的板坯,所述模具由上模具板、下模具板和模具框1组成,模具框1为上下开口的立方体框体结构,所述上模具板和下模具板分别嵌套在模具框1的上开口和下开口处,所述模具框1的侧边开设有注胶口2、注料口4和抽气口3;
首先将所述模具框1与下模具板固定,将树脂导流网铺设在所述模具框1的内侧壁上,然后按照从下到上的顺序将1层竹单板、1层竹纤维毡A、5层竹纤维毡B、1层竹纤维毡A和1层竹单板组成板坯置于模具框1中,所述板坯5的长度为60cm,宽度为30cm,厚度为7cm,5层竹纤维毡B的厚度为板坯厚度的65%,其中竹纤维毡A与竹纤维毡B的竹纤维方向垂直,然后扣合上模具板,固定上模具板和模具框1;
组板坯时铺装的5层竹纤维毡B上每层分布的3个通孔竖向连通形成3个预留孔道6,位于第3层的竹纤维毡B上预设有3个与所述预留孔道连通的支通道,所有支通道7的一端汇聚连通在竹纤维毡B的中心位置,所有支通道的汇聚端通过导流管8与注料口3连通,如图1所示;由于竹纤维毡B上的竹纤维蓬松,所述支通道7可以采用模压竹纤维毡B的方式获得,所述导流管可以采用PVC管;
步骤二、竹纤维毡改性施胶:采用抽真空设备,连接抽气孔3,堵塞注胶口2和注料口4,对模具的内腔抽真空,至真空度达-0.098MPa时,开始从模具的注胶口将改性胶黏剂注入模具内腔用于浸润板坯,树脂导流网利于改性胶黏剂顺着树脂导流网流向板坯的周侧,真空条件利于将所述改性胶黏剂均匀地浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间,优化板坯的层与层之间的结合状态,所述改性胶黏剂的施加量为所述板坯质量的20%;
步骤二中所述改性胶黏剂的制备方法为:将脲醛树脂、柠檬酸三丁酯、二氧化硅按照质量比为100:30:15混合,以2000r/min的速度搅拌30min,得到混合物,然后加入直径为50μm的VS5500型中空微珠以500r/min的速度搅拌60min,得到改性胶黏剂,所述中空微珠加入体积为所述混合物体积的20%,所述改性胶黏剂在25℃时粘度280~300mPa·s。
步骤三、板坯定型与注射微发泡填充:对步骤二中已注入改性胶黏剂的模具以垂直于板坯5厚度方向的轴线为旋转轴进行旋转离心,使得竹纤维砧板板坯5的密度沿厚度方向呈现出中间低,两边高的状态,同时对模具进行预热,保持温度50℃;然后打开上模具板,将聚氨酯发泡预聚体经注料口注射到板坯5的预留孔道6和支通道7中,取出导流管8,控制所述聚氨酯发泡材料注入量,调整所述竹纤维砧板粗产品的密度为0.45g/cm3,然后闭合上模具板,压制上模具板压缩板坯5的厚度至40%,再加热模具至60℃,保持120s,继续升温至110℃,保温3min,待板坯自然冷却后取出,得到竹纤维砧板粗产品;
所述聚氨酯发泡预聚体的制备过程如下:将聚醚4110、聚醚210、硅油、双二甲氨基乙基醚、33%三亚乙基二胺的二丙二醇溶液、乙二醇、三乙醇胺、水、一氟二氯乙烷按照质量比900:100:1:0.2:1.5:4:0.3:4:12混合,搅拌搅匀,得到A组分,然后用异氰酸酯作为B组份与A组份按照质量比为0.95:1搅拌均匀,制备成聚氨酯发泡预聚体;
所述旋转离心的转速为3000r/min,离心的时间为2min,板坯的竹纤维毡的芯层和表层密度差20%左右;
步骤四、步骤三中得到的竹纤维砧板粗产品经修边、抛光、烙印和涂植物油后,获得高阻尼降噪竹纤维砧板成品。
本实施例制备的高阻尼降噪竹纤维砧板成品的性能:密度0.45g/cm3,参考GB/T3222.2-2009中测试方法,制备的高阻尼降噪竹纤维砧板成品的振动噪音衰减为20db,平均吸声系数为0.4;参考GB/T 17657-2013中的测试方法,在制备的高阻尼降噪竹纤维砧板成品中选择6个侧量点测量砧板成品的弯曲强度,6个测量点的平均弯曲强度为70MPa,浸渍剥离性能小于2mm,因此,其具有良好的降噪和使用性能。
实施例2
本实施例的一种高阻尼降噪竹纤维砧板制备方法包括以下步骤:
步骤一、铺装竹纤维砧板的板坯:
筛选长度1-4cm的竹纤维,然后针刺梳理成厚度为7mm、密度为0.157g/cm3的竹纤维毡,作为竹纤维毡A;
在竹纤维毡A上加工出4个绕中心位置均匀分布的通孔,所述通孔的直径为4cm,将加工好通孔的竹纤维毡A作为竹纤维毡B;
选择模具铺装竹纤维砧板的板坯,所述模具由上模具板、下模具板和模具框1组成,模具框1为上下开口的立方体框体结构,所述上模具板和下模具板分别嵌套在模具框1的上开口和下开口处,所述模具框1的侧边开设有注胶口2、注料口4和抽气口3;
首先将所述模具框1与下模具板固定,将树脂导流网铺设在所述模具框1的内侧壁上,然后按照从下到上的顺序将1层竹单板、1层竹纤维毡A、7层竹纤维毡B、1层竹纤维毡A和1层竹单板组成板坯置于模具框1中,所述板坯5的长度为50cm,宽度为25cm,厚度为10cm,7层竹纤维毡B的厚度为板坯厚度的70%,其中竹纤维毡A与竹纤维毡B的竹纤维方向垂直,然后扣合上模具板,固定上模具板和模具框1;
组板坯时铺装的7层竹纤维毡B上每层分布的4个通孔竖向连通形成4个预留孔道6,位于第4层的竹纤维毡B上预设有4个与所述预留孔道连通的支通道,所有支通道7的一端汇聚连通在竹纤维毡B的中心位置,所有支通道的汇聚端通过导流管8与注料口3连通,如图2所示;由于竹纤维毡B上的竹纤维蓬松,所述支通道7可以采用模压竹纤维毡B的方式获得,所述导流管可以采用PVC管;
步骤二、竹纤维毡改性施胶:采用抽真空设备,连接抽气孔3,堵塞注胶口2和注料口4,对模具的内腔抽真空,至真空度达-0.098MPa时,开始从模具的注胶口将改性胶黏剂注入模具内腔用于浸润板坯5,树脂导流网利于改性胶黏剂顺着树脂导流网流向板坯5的周侧,真空条件利于将所述改性胶黏剂均匀地浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间,优化板坯的层与层之间的结合状态,所述改性胶黏剂的施加量为所述板坯5质量的25%;
步骤二中所述改性胶黏剂的制备方法为:将脲醛树脂、柠檬酸三丁酯、二氧化硅按照质量比为100:40:10混合,以1500r/min的速度搅拌25min,得到混合物,然后加入直径为60μm的VS5500型中空微珠以700r/min的速度搅拌60min,得到改性胶黏剂,所述中空微珠加入体积为所述混合物体积的30%,所述改性胶黏剂在25℃时粘度280~300mPa·s。
步骤三、板坯定型与注射微发泡填充:对步骤二中已注入改性胶黏剂的模具以垂直于板坯5厚度方向的轴线为旋转轴进行旋转离心,使得竹纤维砧板板坯的密度沿厚度方向呈现出中间低,两边高的状态,同时对模具进行预热,保持温度50℃;然后打开上模具板,将聚氨酯发泡预聚体经注料口注射到板坯5的预留孔道6和支通道7中,取出导流管8,控制所述聚氨酯发泡材料注入量,调整所述竹纤维砧板粗产品的密度为0.5g/cm3,然后闭合上模具板,压制上模具板压缩板坯的厚度至30%,再加热模具至60℃,保持100s,继续升温至105℃,保温3min,待板坯自然冷却后取出,得到竹纤维砧板粗产品;
所述聚氨酯发泡预聚体的制备过程如下:将聚醚4110、聚醚210、硅油、双二甲氨基乙基醚、33%三亚乙基二胺的二丙二醇溶液、乙二醇、三乙醇胺、水、一氟二氯乙烷按照质量比900:100:1:0.2:1.5:4:0.3:4:12混合,搅拌搅匀,得到A组分,然后用异氰酸酯作为B组份与A组份按照质量比为1.1:1搅拌均匀,制备成聚氨酯发泡预聚体;
所述旋转离心的转速为2000r/min,离心的时间为4min,板坯的竹纤维毡的芯层和表层密度差15%左右;
步骤四、步骤三中得到的竹纤维砧板粗产品经修边、抛光、烙印和涂植物油后,获得高阻尼降噪竹纤维砧板成品。
本实施例制备的高阻尼降噪竹纤维砧板成品的性能:密度0.5g/cm3,参考GB/T3222.2-2009中测试方法,制备的高阻尼降噪竹纤维砧板成品的振动噪音衰减为35db,平均吸声系数为0.6;参考GB/T 17657-2013中的测试方法,在制备的高阻尼降噪竹纤维砧板成品中选择6个侧量点测量砧板成品的弯曲强度,6个测量点的平均弯曲强度为80MPa,浸渍剥离性能小于1mm,因此,其具有良好的降噪和使用性能。
实施例3
本实施例的一种高阻尼降噪竹纤维砧板制备方法包括以下步骤:
步骤一、铺装竹纤维砧板的板坯:
筛选长度1-5cm的竹纤维,然后针刺梳理成厚度为5mm、密度为0.20g/cm3的竹纤维毡,作为竹纤维毡A;
在竹纤维毡A上加工出5个绕中心位置均匀分布的通孔,所述通孔的直径为2cm,将加工好通孔的竹纤维毡A作为竹纤维毡B;
选择模具铺装竹纤维砧板的板坯,所述模具由上模具板、下模具板和模具框组成,模具框为上下开口的立方体框体结构,所述上模具板和下模具板分别嵌套在模具框的上开口和下开口处,所述模具框的侧边开设有注胶口、注料口和抽气口;
首先将所述模具框与下模具板固定,将树脂导流网铺设在所述模具框的内侧壁上,然后按照从下到上的顺序将1层竹单板、1层竹纤维毡A、4层竹纤维毡B、1层竹纤维毡A和1层竹单板组成板坯置于模具框中,所述板坯5的长度为30cm,宽度为20cm,厚度为6cm,4层竹纤维毡B的厚度为板坯厚度的60%,其中竹纤维毡A与竹纤维毡B的竹纤维方向垂直,然后扣合上模具板,固定上模具板和模具框;
组板坯时铺装的4层竹纤维毡B上每层分布的5个通孔竖向连通形成5个预留孔道,位于第2层或第3层的竹纤维毡B上预设有5个与所述预留孔道连通的支通道,所有支通道的一端汇聚连通在竹纤维毡B的中心位置,所有支通道的汇聚端通过导流管与注料口连通;由于竹纤维毡B上的竹纤维蓬松,所述支通道可以采用模压竹纤维毡B的方式获得,所述导流管可以采用PVC管;
步骤二、竹纤维毡改性施胶:采用抽真空设备,连接抽气孔,堵塞注胶口和注料口,对模具的内腔抽真空,至真空度达-0.098MPa时,开始从模具的注胶口将改性胶黏剂注入模具内腔用于浸润板坯,树脂导流网利于改性胶黏剂顺着树脂导流网流向板坯的周侧,真空条件利于将所述改性胶黏剂均匀地浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间,优化板坯的层与层之间的结合状态,所述改性胶黏剂的施加量为所述板坯质量的30%;
步骤二中所述改性胶黏剂的制备方法为:将脲醛树脂、柠檬酸三丁酯、二氧化硅按照质量比为100:35:15混合,以1500r/min的速度搅拌20min,得到混合物,然后加入直径为70μm的VS5500型中空微珠以1000r/min的速度搅拌60min,得到改性胶黏剂,所述中空微珠加入体积为所述混合物体积的40%,所述改性胶黏剂在25℃时粘度280~300mPa·s。
步骤三、板坯定型与注射微发泡填充:对步骤二中已注入改性胶黏剂的模具以垂直于板坯厚度方向的轴线为旋转轴进行旋转离心,使得竹纤维砧板板坯的密度沿厚度方向呈现出中间低,两边高的状态,同时对模具进行预热,保持温度50℃;然后打开上模具板,将聚氨酯发泡预聚体经注料口注射到板坯的预留孔道和支通道中,取出导流管,控制所述聚氨酯发泡材料注入量,调整所述竹纤维砧板粗产品的密度为0.5g/cm3,然后闭合上模具板,压制上模具板压缩板坯的厚度至40%,再加热模具至60℃,保持90s,继续升温至100℃,保温3min,待板坯自然冷却后取出,得到竹纤维砧板粗产品;
所述聚氨酯发泡预聚体的制备过程如下:将聚醚4110、聚醚210、硅油、双二甲氨基乙基醚、33%三亚乙基二胺的二丙二醇溶液、乙二醇、三乙醇胺、水、一氟二氯乙烷按照质量比900:100:1:0.2:1.5:4:0.3:4:12混合,搅拌搅匀,得到A组分,然后用异氰酸酯作为B组份与A组份按照质量比为1:1搅拌均匀,制备成聚氨酯发泡预聚体;
所述旋转离心的转速为1500r/min,离心的时间为5min,板坯的竹纤维毡的芯层和表层密度差10%左右;
步骤四、步骤三中得到的竹纤维砧板粗产品经修边、抛光、烙印和涂植物油后,获得高阻尼降噪竹纤维砧板成品。
本实施例制备的高阻尼降噪竹纤维砧板成品的性能:密度0.5g/cm3,参考GB/T3222.2-2009中测试方法,制备的高阻尼降噪竹纤维砧板成品的振动噪音衰减为35db,平均吸声系数为0.7;参考GB/T 17657-2013中的测试方法,在制备的高阻尼降噪竹纤维砧板成品中选择6个侧量点测量砧板成品的弯曲强度,6个测量点的平均弯曲强度为85MPa,浸渍剥离性能:无明显剥离,因此,其具有良好的降噪和使用性能。
以上所述,仅是本发明的较佳实施例,并非对本发明作任何限制。凡是根据发明技术实质对以上实施例所作的任何简单修改、变更以及等效变化,均仍属于本发明技术方案的保护范围内。
Claims (8)
1.一种高阻尼降噪竹纤维砧板制备方法,其特征在于,该方法包括以下步骤:
步骤一、铺装竹纤维砧板的板坯:
筛选长度1-5cm的竹纤维,然后针刺梳理成厚度为5-10mm、密度为0.15-0.20g/cm3的竹纤维毡,作为竹纤维毡A;
在竹纤维毡A上加工出3-5个绕中心位置均匀分布的通孔,将加工好通孔的竹纤维毡A作为竹纤维毡B;
选择模具铺装竹纤维砧板的板坯,所述模具由上模具板、下模具板和模具框组成,所述上模具板和下模具板分别扣合在模具框的上开口和下开口处,所述模具框的侧边开设有注胶口、注料口和抽气口;
首先将所述模具框与下模具板固定,将树脂导流网铺设在所述模具框的内侧壁上,然后按照从下到上的顺序将1层竹单板、1层竹纤维毡A、4-7层竹纤维毡B、1层竹纤维毡A和1层竹单板组成板坯置于模具框中,所述板坯的长度为30-60cm,宽度为20-40cm,厚度为5-10cm,其中竹纤维毡A与竹纤维毡B的竹纤维方向垂直,然后扣合上模具板,固定上模具板和模具框;
组板坯时铺装的4-7层竹纤维毡B上每层分布的3-5个通孔竖向连通形成3-5个预留孔道,位于处于4-7层中间层的竹纤维毡B上预设有3-5个与所述预留孔道连通的支通道,所述支通道的数量与预留孔道的数量相同,所有支通道的一端汇聚连通在竹纤维毡B的中心位置,所有支通道的汇聚端通过导流管与注料口连通;
步骤二、竹纤维毡改性施胶:对模具的内腔抽真空,然后从模具的注胶口将改性胶黏剂注入模具内腔用于浸润板坯,所述改性胶黏剂均匀地浸入竹纤维毡A和竹纤维毡B,以及竹纤维毡A、竹纤维毡B和竹单板的层间,所述改性胶黏剂的施加量为所述板坯质量的20%-30%;
步骤三、板坯定型与注射微发泡填充:对步骤二中已注入改性胶黏剂的模具以垂直于板坯厚度方向的轴线为旋转轴进行旋转离心,优化板坯的层与层之间的结合状态,使得竹纤维砧板板坯的密度沿厚度方向呈现出中间低,两边高的状态,同时对模具进行预热,保持温度50℃,然后打开上模具板,经注料口将聚氨酯发泡预聚体注射到板坯的预留孔道和支通道中,取出导流管,然后闭合上模具板,压制上模具板压缩板坯的厚度至30%-40%,再加热模具至60℃,保持90s-120s,继续升温至100℃-110℃,保温3min,待板坯自然冷却后取出,得到竹纤维砧板粗产品;
步骤四、步骤三中得到的竹纤维砧板粗产品经修边、抛光、烙印和涂植物油后,获得高阻尼降噪竹纤维砧板成品。
2.根据权利要求1所述的一种高阻尼降噪竹纤维砧板制备方法,其特征在于,步骤一中所述通孔的直径为2cm~5cm。
3.根据权利要求1所述的一种高阻尼降噪竹纤维砧板制备方法,其特征在于,步骤一中4-7层竹纤维毡B的厚度为板坯厚度的60%-70%。
4.根据权利要求1所述的一种高阻尼降噪竹纤维砧板制备方法,其特征在于,步骤二中所述改性胶黏剂的制备方法为:将脲醛树脂、柠檬酸三丁酯、二氧化硅按照质量比为100:(30~40):(10~15)混合,以1000~2000r/min的速度搅拌20~30min,得到混合物,然后加入中空微珠以500~1000r/min的速度搅拌60min,得到改性胶黏剂,所述中空微珠加入体积为所述混合物体积的20%~40%,所述改性胶黏剂在25℃时粘度280~300mPa·s。
5.根据权利要求1所述的一种高阻尼降噪竹纤维砧板制备方法,其特征在于,步骤三中所述聚氨酯发泡预聚体的制备过程如下:将聚醚4110、聚醚210、硅油、双二甲氨基乙基醚、33%三亚乙基二胺的二丙二醇溶液、乙二醇、三乙醇胺、水、一氟二氯乙烷按照质量比900:100:1:0.2:1.5:4:0.3:4:12混合,搅拌搅匀,得到A组分,然后用异氰酸酯作为B组份与A组份按照质量比为(0.9~1.1):1搅拌均匀,制备成聚氨酯发泡预聚体。
6.根据权利要求1所述的一种高阻尼降噪竹纤维砧板制备方法,其特征在于,步骤三中控制所述聚氨酯发泡材料注入量,调整所述竹纤维砧板粗产品的密度为0.45g/cm3~0.5g/cm3。
7.根据权利要求1所述的一种高阻尼降噪竹纤维砧板制备方法,其特征在于,步骤三中旋转离心的转速为1500-3000r/min,离心的时间为2-5min,板坯的竹纤维毡的芯层和表层密度差10%-20%。
8.一种根据权利要求1-6中任一权利要求所述的方法制备的高阻尼降噪竹纤维砧板。
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