CN114012841A - 一种低烟防锈难燃胶合板及其制造方法 - Google Patents
一种低烟防锈难燃胶合板及其制造方法 Download PDFInfo
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Abstract
本发明公开了一种低烟防锈难燃胶合板及其制造方法,包括以下步骤,步骤一,选取速生木材;步骤二,对截取的木段进行旋切;步骤三,选取厚薄均一、无缺陷的单板;单板选用厚薄均一,无结疤、无虫蛀腐朽等缺陷的优质单板;步骤四,将单板进行预处理,预处理完成后进行干燥;步骤五,将完成干燥的单板进行浸渍,浸渍采用二次浸渍法,先采用真空加压浸渍,再采用高压热浸渍处理方式进行。该低烟防锈难燃胶合板解决了现有阻燃板产烟大、吸湿大且会使金属连接件锈蚀的问题。
Description
技术领域:
本发明涉及建筑板材领域,具体讲是一种低烟防锈难燃胶合板及其制造方法。
背景技术:
难燃胶合板是指由木段旋切成单板或由木方刨切成薄木后,对单板进行阻燃处理后再用胶粘剂胶合或直接采用阻燃胶黏剂胶合而成的三层或多层的板状材料。通常用奇数层单板,并使相邻层单板的纤维方向互相垂直胶合而成。
难燃胶合板克服了普通木材易燃烧的缺陷,提高了木材产品的附加值。同时随着人们安全意识的提高以及国家消防要求,在商场、酒店、高层住宅等建筑区域已开始广泛使用难燃胶合板作为内层装修材料。但难燃胶合板仍然存在容易吸潮、产烟量大、阻燃性不稳定且在潮湿环境中对金属部件具有腐蚀性等问题,这些问题影响了难燃板的推广使用。
发明内容:
本发明所要解决的技术问题是,提供一种低烟防锈难燃胶合板的制造方法,通过该制备方法,对原材料进行了更多处理,以提高原材料的渗透性,同时针对普通阻燃剂容易吸潮的问题,开发出了新型复配阻燃剂并使用了不同的浸渍处理方式,并采用复配阻燃胶与复配阻燃剂共同处理的方式来降低产烟量,提高板材的阻燃性能,而且本发明还起到了对板材上配合使用的金属紧固件的防锈效果。
本发明的技术解决方案是,提供一种低烟防锈难燃胶合板的制造方法,其包括以下步骤,
步骤一,选取速生木材,要求树龄10年以上,原木径级在20厘米以上,所述速生木材为杨木、桉木等;
步骤二,对截取的木段进行旋切;
步骤三,选取厚薄均一、无缺陷的单板;单板选用厚薄均一,无结疤、无虫蛀腐朽等缺陷的优质单板;
步骤四,将单板进行预处理,预处理完成后进行干燥;
步骤五,将完成干燥的单板进行浸渍,浸渍采用二次浸渍法,先采用真空加压浸渍,再采用高压热浸渍处理方式进行,其中,真空加压浸渍的浸渍液a由七钼酸铵、植酸、五硼酸铵按比例混合制备而成,高压热浸渍的浸渍液b由砂、硼酸、磷酸二铵、硅酸钠按照比例混合制备而成;
步骤六,基板施胶组坯,组坯过程中遵循相邻层单板互相垂直的原则;
步骤七,将板坯进行冷压、热压,热压完成后进行刮腻养生;
步骤八,制备阻燃粉,并将复配的阻燃粉按照比例添加到胶水中,制备阻燃胶,其中,阻燃粉包括聚磷酸铵、季戊四醇,硼酸锌和氢氧化铝;
步骤九,使用阻燃胶进行贴面,贴面完成即可得到所需的低烟防锈难燃胶合板。
作为优选,步骤二中,使用无卡轴旋切机对木段进行旋切,且只旋切原木边材部位,舍弃心材不取。以杨木为例,选取杨木边材部位进行旋切是因为相比于心材,边材部位的力学性能更加稳定、强度更高,并且木材细胞壁上非闭塞纹孔比例大,边材的抽提物比心材要低,有利于阻燃剂的浸渍以及胶水的渗透。
作为优选,所述单板进行预处理包括以下步骤,第一步,将旋切后的单板放入蒸煮池内,并用隔网压在单板上方,使单板完全浸没到液面下方,采用蒸馏水进行蒸煮,温度设置为70℃,温度偏差为±2℃,时间为3h,蒸煮的目的在于将木材中的部分树胶、无定形沉积物、灰分等去除,提高木材的渗透性;第二步,将蒸煮后的单板先用蒸馏水进行冲洗,洗去表面杂质,再浸泡到质量分数为1%的NaOH溶液中,温度设置为70℃,时间为3h,浸泡到NaOH溶液的目的在于去除木材中的抽提物,打开细胞壁上被抽提物堵塞的纹孔口,提高木材单板的渗透性,同时减少木材抽提物对胶合性能的影响。浸泡完成后,再用蒸馏水反复冲洗,洗去萃取液。
作为优选,所述单板完成预处理工作后按如下步骤进行干燥处理,首先利用大气干燥使木材含水率达到纤维饱和点,再利用冷冻干燥干降低含水率至较低水平,通过串联两种干燥方式,可以减少干燥过程中出现的纹孔闭塞,提高干燥后单板的渗透性,同时避免了纤维饱和点以下干燥时,大气干燥会引起单板收缩变形的缺陷。
作为优选,步骤五中,浸渍液a由七钼酸铵2-4份、植酸0.5-1份、五硼酸铵1-3份混合制备而成,浸渍液b由硼砂5-10份,硼酸3-10份、磷酸二铵1-2份、硅酸钠3-6份混合制备而成。
作为优选,步骤五中,真空加压浸渍方式如下,将干燥完成的单板放入浸渍罐内,储液池内倒入浸渍液a,设置仪器真空压力为-0.08--0.1Mpa,抽真空时间为30min,此步的目的为抽出单板内蕴含的空气,提高单板的渗透性;抽真空完毕后,开始加压浸渍,设置加压压力1-1.2Mpa,加压时间2.5h;浸渍工作完成后将单板取出,首先在大气中将单板含水率干燥至纤维饱和点(30%)
作为优选,将第一次浸渍处理完成的单板浸泡到浸渍液b中,采用高压热浸渍的方式进行处理,其中加压压力为5Mpa,加热温度为60℃,浸渍时间为15min,第二次浸渍工作完成后将单板取出,将单板再次进行干燥,干燥过程如下,先采用大气干燥将单板含水率干燥至纤维饱和点,之后采用冷冻干燥方式将单板含水率干燥至20%左右,冷冻干燥过程中参数设置为预冻温度为-50℃,预冻处理时间1.5h,冷凝温度-50℃,升华真空度为30Pa。
作为优选,阻燃粉中还包括高岭土,其中,按质量百分比计,硼酸锌为10-15%,氢氧化铝为10-20%,聚磷酸铵为35-40%,季戊四醇为20-35%,高岭土为10-15%。
采用二次浸渍方式使得七钼酸铵与磷酸二铵反应生成磷钼酸盐沉淀;使植酸与硅酸钠生成硅酸沉淀,采用这种方式可以提高单板内化学试剂的抗流失性,同时进行反应生成酸盐沉淀可以降低难燃板的吸湿性。阻燃剂配方中的硼砂与硼酸组分是阻燃性能优良且吸湿性小的优质阻燃剂,本发明创新性的利用高压浸渍设备通过热浸渍的方式进行处理,加压压力为5Mpa,阻燃剂溶液温度保持在60℃,一方面提高了硼酸硼砂的溶解度(硼砂在60℃下溶解度为20.3g/100g,硼酸在60℃下的溶解度为14.89g/100g)。另一方面加大了浸渍压力,使得单板的载药量得到提升,而载药量如果不得到提升的话难以应用。对本领域技术人员而言,虽然知悉硼系吸湿性低,但按常规方式操作很难将其浸渍到单板内部,从而形成了一个技术偏见,硼系阻燃剂难以应用于板材进行阻燃性能的提升。而本申请,通过上述处理提高了硼系阻燃剂的溶解度,从而可以较好的浸渍到单板内部,在克服技术偏见使硼系阻燃剂运用于板材阻燃的同时,充分利用了其低吸湿性的特性,从而解决现有技术的难燃板吸湿性大的问题。
而在单板浸渍完成后采用冷冻干燥的原因在于,冷冻干燥使得被干燥单板内部的水分是在冻结状态下直接升华挥发的。故在干燥过程中,水汽不会带动可溶性物质移向物料表面,不会在物料表面沉积盐类,同时不会因水分蒸发使得部分阻燃剂随之挥发,亦不存在普通干燥方式中因中心水分移向物料表面而对细胞或纤维产生张力,使物料干燥后因收缩引起变形的缺陷,有利于后续加工工序。
作为优选,阻燃粉中还包括高岭土,其中,按质量百分比计,硼酸锌为10-15%,氢氧化铝为10-20%,聚磷酸铵为35-40%,季戊四醇为20-35%,高岭土为10-15%。阻燃粉复配完成后在三聚氰胺胶水制作过程的后期添加到胶水中,制备阻燃胶。特别是,复配阻燃粉采用膨胀包覆阻燃机理,以聚磷酸铵作为酸源和气源,以季戊四醇作为炭源,以分解产物氧化铝等作为熔融膨胀物包覆在板材表面,将基板与空气隔绝。硼酸锌与氢氧化铝协同以提高阻燃效果,相比于单纯的氢氧化铝或硼酸锌,把一部分替换成另一种组分后,其阻燃效果会有较大的提升。并且,在装修过程中,基本上的连接件和紧固件为镀锌件,通过硼酸根离子与镀锌层的结合,会反应生成一层硼酸锌之类的保护膜,从而保护镀锌件表面不会锈蚀。而加入高岭土,可进一步提高阻燃效果。
作为优选,贴面所用的阻燃胶的施胶工艺为单面施胶量100-125g/㎡,冷压压力为0.5-0.7Mpa/㎡,冷压时间12min;热压压力为0.5-0.7Mpa/㎡,时间3-4min,热压温度90-120℃。
另外,所述的基板所用胶水种类为普通三聚氰胺胶水,单板施胶方式为辊筒涂胶,单面施胶量为200-250g/㎡,胶水中面粉添加量为25%。
并且,为使得胶水可以部分渗透到单板内部,加强胶合性能,同时为避免陈放时间过长导致胶水干结,设置闭合陈放时间为0.5-2h为宜,具体陈放时间由单板含水率及环境温湿度决定。
步骤七中,冷压工艺优选为单位压力0.5-0.7Mpa/㎡,冷压时间为2-4h;热压工艺优选为单位压力0.6-0.9Mpa/㎡,热压时间为1-1.5min/mm,热压温度为90-130℃。
在基板热压完成后,需放在室内进行养生,一方面可以平衡板材内部含水率,另一方面是使得基材与当地含水率相适应。
本发明还提供一种如上述的低烟防锈难燃胶合板的制造方法制备而成的低烟防锈难燃胶合板。
采用以上方案后与现有技术相比,本发明具有以下优点:首先,本发明在原木的选材以及挑选旋切单板方面,选择了力学性能较为稳定,细胞壁上非闭塞纹孔多,且抽提物含量较少的边材,有利于提高难燃板的载药量。其次,本发明创新性地对单板进行预处理,提取出木材中部分的抽提物、灰分等物质,在提升单板渗透性的同时减少了木材抽提物对胶合性能的影响。并且,本发明的浸渍工艺摒弃了传统浸渍工艺,并克服了技术偏见,采用真空加压浸渍工艺与高压热浸渍工艺相结合,采用二次浸渍法可以通过组分之间的反应,例如七钼酸铵与磷酸二铵,植酸与硅酸钠之间,生成沉淀物,一方面可以降低阻燃剂组分的吸湿性,另一方面提高单板中化学药剂的抗流失性;而高压热浸渍工艺的目的在于提高硼酸、硼砂在水中的溶解度从而可以提高单板的载药量。同时,本发明还创造性地提高了单板中硼酸与硼砂的载药量,克服了常规浸渍中硼酸、硼砂难以浸渍的问题,充分发挥磷氮硼阻燃剂之间的协同阻燃作用,且相比于磷、氮系阻燃剂,硼系阻燃剂的吸湿性小,对木材的力学性能影响小,因而以硼系阻燃剂为主体构建的阻燃体系具有吸湿性低,阻燃性能强的特点。另外,本发明相比于普通的阻燃处理方式不同点在于,结合了浸渍处理阻燃与胶层阻燃这两者的优势,一方面浸渍阻燃处理后,化学药剂可以吸收大量热量并分解为不可燃物质,阻碍热量的传导;另一方面通过胶层中的有效成分形成阻燃包覆物包覆在木材的表面,阻碍火焰的传播,采用浸渍阻燃与胶层阻燃并行的方式克服了传统浸渍阻燃产烟量大的问题,同时弥补了胶层阻燃阻燃性能不稳定的缺陷。最后,本发明的优势在于可以保护金属结构件免锈蚀,一方面这是因为本发明的吸湿性小,在潮湿环境中仍能够保持较低的含水率,降低了金属结构件锈蚀的可能性;另一方面研发出的复配阻燃剂对金属有保护作用,保护金属部件不锈蚀。
附图说明:
图1为本发明的实施例与对比例的热释放速率对比示意图。
图2为本发明的实施例与对比例的总释放热对比示意图。
图3为本发明的实施例与对比例的烟生成速率对比示意图。
图4为本发明的实施例与对比例的单位面积总生烟量对比示意图。
具体实施方式:
下面就具体实施方式对本发明作进一步说明:
实施例A
一种低烟防锈难燃胶合板,其制造工艺如下:
步骤一,单板旋切挑选:优选的杨木原木,只选取边材部位进行旋切,挑选出表面无缺陷的优质单板;
步骤二,单板预处理:首先用70℃热水浸泡3h,浸泡完成后取出,再次放入到70℃浓度为1%的NaOH溶液中进行抽提,时间为3h,将预处理完成的单板使用蒸馏水进行充分冲洗;
步骤三,将预处理完成的单板先进行大气干燥,将单板含水率干燥至纤维饱和点(30%左右),再进行冷冻干燥,预冻温度为-50℃,预冻处理时间1.5h,冷凝温度-50℃,升华真空度为30Pa;
步骤四,调配浸渍液a:取七钼酸铵2Kg、植酸0.5Kg、五硼酸铵1Kg加入到100kg水中,搅拌均匀,直至溶液无沉淀;
步骤五,真空加压浸渍:将完成冷冻干燥的单板放入浸渍罐内,储液池内倒入浸渍液a,设置仪器真空压力为-0.1Mpa,抽真空时间为30min;加压压力1Mpa,加压时间2.5h,将浸渍完成的单板进行大气干燥,将单板含水率干燥至30%左右;
步骤六,调配浸渍液b:取磷酸二铵1Kg、硼酸5Kg、硼砂8kg、硅酸钠3Kg加入到温度为60±2℃的100Kg水中,搅拌均匀直至溶液底部无沉淀;
步骤七,高压热浸渍:设置浸渍参数保温温度为60℃,加压压力为5Mpa,加压时间为15min;
步骤八,将二次浸渍完成后的单板先进行大气干燥,将单板含水率干燥至纤维饱和点(30%左右),再进行冷冻干燥,预冻温度为-50℃,预冻处理时间1.5h,冷凝温度-50℃,升华真空度为30Pa;
步骤九,施胶组坯:采用辊筒施胶方式进行涂胶,单面施胶量为220g/㎡,面粉添加量为25%,相邻层单板交错组坯,制备三层阻燃基板;
步骤十,将基板进行冷、热压:冷压单位压力为:0.6Mpa,时间为2.5h;热压单位压力0.7Mpa,时间为1min/mm,热压温度为120℃,热压完成后进行砂光刮腻处理;
步骤十一,基板养生:将刮腻完成的单板进行养生,养生时间为3天;
步骤十二,调配阻燃粉、制备阻燃胶:按照硼酸锌:氢氧化铝:聚磷酸铵:季戊四醇:高岭土=15:20:35:20:10进行调配。将10kg的复配阻燃粉添加到20kg的三聚氰胺胶水中,制得阻燃胶;本实施例中,硼酸锌的部分替换为氢氧化铝,并调整两者比例为3:4后,最大烟密度(NITS烟室法)由85降至68,可见具有较好的抑烟效果;
步骤十三,将基板采用复配阻燃胶进行贴面热压:单面施胶量120g/㎡,冷压单位压力为0.6Mpa,冷压时间10min;热压单位压力为0.6Mpa,时间3min,热压温度110℃;
步骤十四,贴面工艺完成后,裁边即可得所需的难燃胶合板;
实施例B
一种低烟防锈难燃胶合板,其制造工艺如下:
步骤一,单板旋切和单板预处理以及单板干燥方式与实施例1中步骤1-3相同;
步骤二,调配浸渍液a:取七钼酸铵4Kg、植酸1Kg、五硼酸铵3Kg加入到100kg水中,搅拌均匀,直至溶液底部无沉淀即可;
步骤三,真空加压浸渍:将干燥处理过的单板放入浸渍罐内,储液池内倒入浸渍液a,设置仪器真空压力为-0.1Mpa,抽真空时间为30min;加压压力1Mpa,加压时间2.5h,将浸渍完成的单板进行大气干燥,将单板含水率干燥至30%左右;
步骤四,调配浸渍液b:取磷酸二铵2Kg、硼酸5Kg、硼砂8kg、硅酸钠6Kg加入到温度为60±2℃的100Kg水中搅拌均匀;
步骤五,高压热浸渍:设置浸渍参数保温温度为60℃,加压压力为5Mpa,加压时间为15min;
步骤六,将浸渍完成的单板进行干燥:首先利用大气干燥将单板含水率干燥至纤维饱和点(30%左右),再进行冷冻干燥,预冻温度为-50℃,预冻处理时间1.5h,冷凝温度-50℃,升华真空度为30Pa;
步骤七,施胶组坯:采用辊筒施胶方式进行涂胶,单面施胶量为220g/㎡,面粉添加量为25%,相邻层单板交错组坯,制备三层阻燃基板;
步骤八,将基板进行冷、热压:冷压单位压力为:0.6Mpa,时间为2.5h;热压单位压力0.7Mpa,时间为1min/mm,热压温度为120℃,热压完成后进行砂光刮腻处理;
步骤九,基板养生:将刮腻完成的单板进行养生,养生时间为3天;
步骤十,配制阻燃胶:按照硼酸锌:氢氧化铝:聚磷酸铵:季戊四醇:高岭土=10:10:35:35:10的比例复配阻燃粉,将10kg的复配阻燃粉添加到20kg的三聚氰胺胶水中,制得阻燃胶;其中,硼酸锌与氢氧化铝并用,二者比例(1:1)~(1:5)可提高阻燃性能;本实施例中,硼酸锌的部分替换为氢氧化铝,并调整两者比例为1:1后,最大烟密度(NITS烟室法)由85降至66,可见具有较好的抑烟效果;
步骤十一,将基板采用复配阻燃胶进行贴面热压:单面施胶量120g/㎡,冷压单位压力为0.6Mpa,冷压时间10min;热压单位压力为0.6Mpa,时间3min,热压温度110℃;
步骤十二,贴面工艺完成后,裁边即可得所需的难燃胶合板。
对照例:
步骤一,采购市面上已浸渍完成的阻燃单板作为原材料,不再进行任何阻燃处理;
步骤二,施胶组坯:所述胶黏剂为改性脲醛胶,采用辊筒施胶方式进行涂胶,单面施胶量为220g/㎡,面粉添加量为25%,相邻层单板之间纹理交错,制备三层阻燃基板;
步骤三,将基板进行冷、热压:冷压单位压力为:0.6Mpa,时间为2.5h;热压单位压力0.7Mpa,时间为1min/mm,热压温度为120℃,热压完成后进行砂光刮腻处理;
步骤四,基板养生:将刮腻完成的单板进行养生,养生时间为3天;
步骤五,贴面热压:所用胶黏剂为改性脲醛胶,单面施胶量120g/㎡,冷压单位压力为0.6Mpa,冷压时间10min;热压单位压力为0.6Mpa,时间3min,热压温度110℃;
步骤六,贴面工艺完成后,裁边即可得所需对照样板。
为评估实施例相比于对比例其阻燃性能和防锈蚀能力的提升程度,将对比例与实施例所制备的难燃胶合板进行金属构件防锈蚀能力测试(AWPA E12-20)极限氧指数(GB/T2406-2009)和锥形量热仪测试(ISO 5660-1),所得结果如下:
氧指数测试结果:
单体燃烧试验测试结果:
对金属连接件的保护能力测试:
镀锌件,100%防锈蚀;普通金属紧固件,80%防锈蚀效果。
锥形量热仪测试结果:热释放速率(Heat Release Rate)如图1所示;
总释放热(Total Heat Release):如图2所示;
烟生成速率(Smoke Produce Rate):如图3所示;
单位面积总生烟量(Total Smoke Rate):如图4所示。
通过对比分析对照例和实施例的测试结果可得知:相比于现有难燃板,本发明所提供的低烟防锈难燃胶合板的阻燃性能更加优异且产烟量和烟生成速率低,同时具备了对金属连接件的保护能力,保护金属连接件在潮湿环境下不会锈蚀,从而提高使用寿命。
以上仅就本发明较佳的实施例作了说明,但不能理解为是对权利要求的限制。凡是利用本发明说明书所做的等效结构或等效流程变换,均包括在本发明的专利保护范围之内。
Claims (10)
1.一种低烟防锈难燃胶合板的制造方法,其特征在于:其包括以下步骤,
步骤一,选取速生木材,要求树龄10年以上,原木径级在20厘米以上;
步骤二,对截取的木段进行旋切;
步骤三,选取厚薄均一、无缺陷的单板;
步骤四,将单板进行预处理,预处理完成后进行干燥;
步骤五,将完成干燥的单板进行浸渍,浸渍采用二次浸渍法,先采用真空加压浸渍,再采用高压热浸渍处理方式进行,其中,真空加压浸渍的浸渍液a由七钼酸铵、植酸、五硼酸铵按比例混合制备而成,高压热浸渍的浸渍液b由砂、硼酸、磷酸二铵、硅酸钠按照比例混合制备而成;
步骤六,基板施胶组坯,组坯过程中遵循相邻层单板互相垂直的原则;
步骤七,将板坯进行冷压、热压,热压完成后进行刮腻养生;
步骤八,制备阻燃粉,并将复配的阻燃粉按照比例添加到胶水中,制备阻燃胶,其中,阻燃粉包括聚磷酸铵、季戊四醇,硼酸锌和氢氧化铝;
步骤九,使用阻燃胶进行贴面。
2.根据权利要求1所述的低烟防锈难燃胶合板的制造方法,其特征在于:步骤二中,使用无卡轴旋切机对木段进行旋切,且只旋切原木边材部位,舍弃心材不取。
3.根据权利要求1所述的低烟防锈难燃胶合板的制造方法,其特征在于:步骤四中,所述单板进行预处理包括以下步骤,第一步,将旋切后的单板放入蒸煮池内,并用隔网压在单板上方,使单板完全浸没到液面下方,采用蒸馏水进行蒸煮,温度设置为70℃,温度偏差为±2℃,时间为3h;第二步,将蒸煮后的单板先用蒸馏水进行冲洗,洗去表面杂质,再浸泡到质量分数为1%的NaOH溶液中,温度设置为70℃,时间为3h,浸泡完成后,再用蒸馏水反复冲洗,洗去萃取液。
4.根据权利要求3所述的低烟防锈难燃胶合板的制造方法,其特征在于:所述单板完成预处理工作后按如下步骤进行干燥处理,首先利用大气干燥使木材含水率达到纤维饱和点,再利用冷冻干燥干降低含水率。
5.根据权利要求1所述的低烟防锈难燃胶合板的制造方法,其特征在于:步骤五中,浸渍液a由七钼酸铵2-4份、植酸0.5-1份、五硼酸铵1-3份混合制备而成,浸渍液b由硼砂5-10份,硼酸3-10份、磷酸二铵1-2份、硅酸钠3-6份混合制备而成。
6.根据权利要求1所述的低烟防锈难燃胶合板的制造方法,其特征在于:步骤五中,真空加压浸渍方式如下,将干燥完成的单板放入浸渍罐内,储液池内倒入浸渍液a,设置仪器真空压力为-0.08--0.1Mpa,抽真空时间为30min;抽真空完毕后,开始加压浸渍,设置加压压力1-1.2Mpa,加压时间2.5h;浸渍工作完成后将单板取出,在大气中将单板含水率干燥至纤维饱和点。
7.根据权利要求6所述的低烟防锈难燃胶合板的制造方法,其特征在于:将第一次浸渍处理完成的单板浸泡到浸渍液b中,采用高压热浸渍的方式进行处理,其中加压压力为5Mpa,加热温度为60℃,浸渍时间为15min,第二次浸渍工作完成后将单板取出,将单板再次进行干燥,干燥过程如下,先采用大气干燥将单板含水率干燥至纤维饱和点,之后采用冷冻干燥方式将单板含水率干燥至18-22%,冷冻干燥过程中参数设置为预冻温度为-50℃,预冻处理时间1.5h,冷凝温度-50℃,升华真空度为30Pa。
8.根据权利要求1所述的低烟防锈难燃胶合板的制造方法,其特征在于:阻燃粉中还包括高岭土,其中,按质量百分比计,硼酸锌为10-15%,氢氧化铝为10-20%,聚磷酸铵为35-40%,季戊四醇为20-35%,高岭土为10-15%。
9.根据权利要求1所述的低烟防锈难燃胶合板的制造方法,其特征在于:贴面所用的阻燃胶的施胶工艺为单面施胶量100-125g/㎡,冷压压力为0.5-0.7Mpa/㎡,冷压时间12min;热压压力为0.5-0.7Mpa/㎡,时间3-4min,热压温度90-120℃。
10.一种如权利要求1-9任一项所述的低烟防锈难燃胶合板的制造方法制备而成的低烟防锈难燃胶合板。
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