CN111234763B - 一种轻质刨花板用的复配发泡胶黏剂 - Google Patents
一种轻质刨花板用的复配发泡胶黏剂 Download PDFInfo
- Publication number
- CN111234763B CN111234763B CN202010060956.6A CN202010060956A CN111234763B CN 111234763 B CN111234763 B CN 111234763B CN 202010060956 A CN202010060956 A CN 202010060956A CN 111234763 B CN111234763 B CN 111234763B
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- Prior art keywords
- component
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- azodicarbonamide
- foaming adhesive
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical class NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims abstract description 109
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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Abstract
本发明提供一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述胶黏剂包括A组份和B组份,所述A组份包含聚醚多元醇、聚酯多元醇、改性偶氮二甲酰胺、泡沫稳定剂;所述B组份为异氰酸酯。与传统研究的复配发泡胶黏剂相比,本发明A组份的聚醚多元醇和聚酯多元醇、B组份的异氰酸酯以及木材刨花中的水分反应形成聚氨酯泡沫,同时A组份的改性偶氮二甲酰胺发泡分解产生气体,增大泡沫体系的流动性,使得泡沫迅速填充到刨花与刨花之间的间隙,改性偶氮二甲酰胺分解产生的气体使胶黏剂泡沫体系将刨花牢固结合在一起,在刨花—胶黏剂—刨花之间形成良好的接触,并在刨花板内部形成均匀的孔隙结构,从而保证了必要的胶合强度,获得了高强度和低密度的轻质刨花板。
Description
技术领域
本发明涉及木材胶黏剂领域,具体涉及一种轻质刨花板用的复配发泡胶黏剂。
背景技术
刨花板自问世以来,以其价格低、性能稳定等众多优点,在现代家具制造业和室内装修领域占据着重要地位。近几年,随着我国定制家居行业的快速发展,刨花板市场需求大增。目前我国生产销售的家具用刨花板产品密度大多在620~720kg/m3。此密度范围的刨花板由于密度高,在加工、运输和使用过程中成本相对较高。随着木材资源紧缺和人造板对原料需求的增长,轻量化逐渐成为一种发展趋势。用轻质刨花板代替普通刨花板作为非结构用家具及装饰板材,不仅节约木材资源,而且还能降低加工能耗和运输成本。总体来说,我国轻质刨花板研制大多处于实验室研究阶段,主要是采用速生材以及其他低密度木材为原料,已有的研究中产品密度大多在400~500kg/m3,但物理力学性能偏低。若达到较优的性能,通常对原料要求较高,如采用径级较大的木材,严格控制刨花形态,减少树皮含量,提高施胶量等,工艺上实现起来有困难。
目前,研发发泡胶黏剂是实现轻质刨花板产业化的重要技术途径。发泡胶黏剂借助胶黏剂发泡时产生的压力可使刨花与胶黏剂之间形成良好接触,从而保证胶合强度,同时使板材内部充满微孔而降低重量。Monteiro等利用木薯淀粉的粘合性和自发泡特性,用其制备了密度为207~407kg/m3的轻质刨花板,性能最优的一组轻质刨花板密度为318kg/m3,内胶合强度为0.67Mpa,吸水厚度膨胀率为8.7%,但其研究没有对板材的力学性能进行系统评价。张桂兰等以ADC(偶氮二甲酰胺)为发泡剂,异氰酸酯为胶粘剂,研究了发泡与固化的协调工艺以及发泡对材料力学性能的影响,制备出超低密度(0.27-0.30g/cm3)生物质纤维复合材料,但胶黏剂复配过程中并未添加聚酯多元醇、聚醚多元醇、泡沫稳定剂等助剂。而本发明采用A组份和B组份复配发泡胶黏剂用以制备轻质刨花板,轻质刨花板密度≤0.50g/cm3,性能达到国家标准(GB/T 4897-2015中P2型)的要求,该板材主要用于制备家具。
谢义鹏等申请了一种凯夫拉纤维-聚氨酯复合发泡材料及其制备方法,并在权利4中公开了四种组份,所述的发泡剂为碳酸氢钠、偶氮二甲酰胺、异戊烷、正戊烷、氟氯烃发泡剂中的一种或几种的组合。该专利中所提到的凯夫拉纤维主要作为刚性填充物,直接参与泡沫材料刚性骨架的形成过程,所述用于制备聚氨酯的4种组份主要作为发泡体系,是该发明的发泡材料主体。而本发明所用到的包含偶氮二甲酰胺等组份制备的发泡胶黏剂用于制备轻质刨花板,主要作用是粘合刨花与刨花,并适当发泡填充刨花之间的间隙,制备出轻质高强的刨花板。且所用偶氮二甲酰胺经过改性处理以降低其发泡温度,达到与聚氨酯胶黏剂协同作用的目的。
宋阔等申请了一种双组份聚氨酯发泡胶黏剂,公开了一种双组份聚氨酯发泡胶黏剂的配方及其制备方法,制备的发泡胶黏剂具有快速固化、耐久性好的特点,其组份包括组份A包含改性多异氰酸酯和改性剂、组份B(组合白料)包含聚醚多元醇、聚酯多元醇、填料、水解稳定剂、催化剂、发泡剂、助剂等组份,该发泡胶黏剂主要用于金属、玻璃、塑料等材料的粘接。而本发明制备的复配发泡胶黏剂主要用于制备轻质刨花板,可制备出密度≤0.5g/cm3,同时刨花板性能满足国家标准(GB/T 4897-2015中P2型)的要求,且所用发泡剂为改性偶氮二甲酰胺,该发泡剂分解温度较聚氨酯胶黏剂的固化温度低,可与聚氨酯胶黏剂协同作用,发泡后快速固化形成具有一定强度的刨花-发泡胶-刨花的结构,并能适当填充刨花之间的间隙,从而实现“轻质高强”的目的。
国内外科研工作者对轻质刨花板有一定研究,但在生产应用上还不成熟,发泡胶黏剂的研发处于起步阶段,未能形成大规模工业化生产,急需开发具有竞争优势的用于轻质刨花板产业的发泡胶黏剂,以节约木材资源、降低加工能耗和生产运输成本等。
发明内容
本发明的发明目的在于:针对当刨花板密度降低时,物理力学性能下降严重,不能满足使用要求,本发明采用发泡型聚氨酯胶黏剂制备刨花板,可实现刨花板“轻质高强”的性能要求。本发明采用的技术方案如下:
一种轻质刨花板用的复配发泡胶黏剂,所述胶黏剂包括A组份和B组份,所述A组份包含聚醚多元醇、聚酯多元醇、改性偶氮二甲酰胺、泡沫稳定剂,所述B组份为异氰酸酯;所述A组份中各成分的重量份为:所述聚醚多元醇55-80份,所述聚酯多元醇6-25份,所述改性偶氮二甲酰胺2-5份,所述泡沫稳定剂0.2-1份;
优选地,所述A组份中各成分的重量份为:所述聚醚多元醇60-70份;所述聚酯多元醇10-20份;所述改性偶氮二甲酰胺3-4份,所述泡沫稳定剂0.4-0.8份;
优选地,所述的A组份和B组份的质量比为:0.2-1:1;
优选地,所述的A组份和B组份的质量比为:0.3-0.8:1;
优选地,改性偶氮二甲酰胺添加量是A组份和B组份总质量的3-9%;
优选地,所述聚醚多元醇分子量为400-6000,官能度2-5;
优选地,所述聚酯多元醇分子量为1000-3000,官能度2-3;
优选地,所述改性偶氮二甲酰胺的改性剂为碳酸锌和尿素、醋酸锌和尿素、碳酸锌和柠檬酸、羟氨氯化锌、氧化锌、过氧化锌中的任一种或多种;
优选地,所述改性偶氮二甲酰胺的分解温度为135-195℃;
优选地,所述聚醚多元醇为聚氧化丙烯三醇、聚氧化丙烯二醇、氧化乙烯-氧化丙烯的共聚醚三醇和四氢呋喃-氧化丙烯的共聚醚二醇中的一种或多种;
优选地,所述聚酯多元醇为己二酸系聚酯二醇、芳香族聚酯二醇、聚己内酯二醇中的一种或多种;
优选地,所述泡沫稳定剂为聚醚改性有机硅类;
优选地,所述多异氰酸酯为1,4-丁二异氰酸酯、异氰酸甲酯基-1,8-辛烷二异氰酸酯、1,5-萘二异氰酸酯、二苯基甲烷二异氰酸酯(MDI)、多亚甲基多苯基多异氰酸酯(PM)、2,4-甲苯二异氰酸酯中的任一种或多种;
本发明还提供一种轻质刨花板用的复配发泡胶黏剂的制备方法,所述制备方法包括以下步骤:
1)A组份制备
在常温下,按照比例,将聚醚多元醇、聚酯多元醇加入反应釜中搅拌,搅拌分散1-2h,再加入改性偶氮二甲酰胺、泡沫稳定剂,搅拌分散10-30min,即可得到所述A组份产品;
2)B组份制备
将工业商品直接分装即可;
3)所述A组份和所述B组份分离存放。
本发明通过发泡型聚氨酯中的异氰酸基(-NCO)与改性偶氮二甲酰胺反应形成泡沫,填充刨花间隙,将刨花牢固结合在一起,可使刨花—胶黏剂—刨花之间形成良好的接触,从而保证了必要的胶合强度,获得了高强度、低吸水厚度膨胀率的轻质刨花板;A组份的聚醚多元醇和聚酯多元醇与B组份的异氰酸酯反应形成聚氨酯泡沫,同时A组份的改性偶氮二甲酰胺发泡分解产生气体,增大泡沫体系的流动性,使得泡沫迅速填充到刨花与刨花之间的间隙。同时使板材的内部充满微孔而降低板材的容重,其板材最小密度为0.44g/cm3,将该试验板材(0.44g/cm3)的物理力学性能与同密度的以脲醛树脂为胶黏剂制备的轻质刨花板进行比较,其结果明显更好,其性能满足国家标准(GB/T 4897-2015中P2型)的要求。
另一方面,正常条件生产的AC发泡剂分解温度一般高于200℃,对于固化温度较低的聚氨酯胶黏剂,偶氮二甲酰胺AC发泡剂须在较低的温度下分解,才能与聚氨酯固化温度及交联温度相适应,因此须对AC发泡剂进行改性处理。改性条件为:在常温条件下,成品AC发泡剂中,按一定比例添加碳酸锌和尿素、醋酸锌和尿素、碳酸锌和柠檬酸、羟氨氯化锌、氧化锌、过氧化锌中的任一种或多种,并混合均匀,抑制AC发泡剂分解时二级反应的发生,从而减少脲唑的生成,可得到低分解温度的改性AC发泡剂。通过控制活化剂的添加量(3-20%)来调节其分解温度(135—195℃)。
综上所述,由于采用了上述技术方案,本发明的有益效果是:
1.本发明使用改性偶氮二甲酰胺(AC)发泡剂属于无机类的化学发泡剂,无毒、无味、不污染、不变色,粒子细而易分散,通过改性降低其发泡分解温度至140℃、增大其发气量,使分解温度,发气速度和发气量达到最适合值,与聚氨酯胶黏剂协同作用。
2.本发明借助胶黏剂发泡时产生的压力可使刨花与胶黏剂之间形成良好接触,从而保证胶合强度,同时使板材内部充满微孔而降低重量。
3.本发明选择AC发泡剂与胶黏剂复配制备发泡胶黏剂,以“降低刨花板密度、保证其力强度”为研究目标,制备发泡型轻质刨花板,并探究各工艺条件对刨花板物理力学性能的影响,以期为刨花板产业的增值增效提供理论参考。
具体实施方式
为了更清楚地表达本发明,以下通过具体实施例对本发明作进一步说明。下述实施例中所使用的实验方法如无特殊说明,均为常规方法。下述实施例中所用的材料、试剂等,如无特殊说明,均可从商业途径得到。
其中,各个实施例中AC发泡剂改性剂配方如下:
表1 AC发泡剂改性剂配方
实施例1
(1)A组份的制备:
制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、碳酸锌和尿素,m(AC):m(ZnCO3):m(CO(NH2)2)=1:0.35:0.35,将碳酸锌和尿素分别加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为140℃的改性偶氮二甲酰胺;在常温下,按照比例,将55份分子量为600的聚氧化丙烯三醇;6份己二酸系聚酯二醇加入反应釜中搅拌,搅拌分散1h,再加入添加上述改性的偶氮二甲酰胺2份,聚醚改性有机硅类泡沫稳定剂0.2份,搅拌分散10min,即可得到所述A组份产品。
(2)B组份制备
将工业商品1,4-丁二异氰酸酯直接分装即可。
将A组份和B组份按0.2∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
实施例2(1)A组份的制备:
制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、醋酸锌和尿素,m(AC):m(Zn(C2H3O2)2):m(CO(NH2)2)=1:0.25:0.25,将醋酸锌和尿素分别加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为140℃的改性偶氮二甲酰胺;在常温下,按照比例,将80份分子量为1500的聚氧化丙烯二醇;25份芳香族聚酯二醇加入反应釜中搅拌,搅拌分散2h,再加入添加上述改性的偶氮二甲酰胺5份,聚醚改性有机硅类泡沫稳定剂1份,搅拌分散30min,即可得到所述A组份产品。
(2)B组份制备
将工业商品异氰酸甲酯基-1,8-辛烷二异氰酸酯直接分装即可。
将A组份和B组份按1∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
实施例3
(1)A组份的制备:
制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、碳酸锌和柠檬酸,m(AC):m(ZnCO3):m(C6H8O7)=1:0.25:0.25,将碳酸锌和柠檬酸分别加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为145℃的改性偶氮二甲酰胺;在常温下,按照比例,将60份分子量为3000的聚氧化乙烯-氧化丙烯的共聚醚三醇;6-25份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入添加上述改性的偶氮二甲酰胺3份,聚醚改性有机硅类泡沫稳定剂0.7份,搅拌分散20min,即可得到所述A组份产品。
(2)B组份制备
将工业商品1,5-萘二异氰酸酯直接分装即可。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
实施例4
(1)A组份的制备:
制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、羟氨氯化锌,m(AC):m(2NH2OH.ZnCl2)=1:0.15,将羟氨氯化锌加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为135℃的改性偶氮二甲酰胺;在常温下,按照比例,将60份分子量为3000的聚四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入添加上述改性的偶氮二甲酰胺3.5份,聚醚改性有机硅类泡沫稳定剂0.7份,搅拌分散20min,即可得到所述A组份产品。
(2)B组份制备
将工业商品二苯基甲烷二异氰酸酯(MDI)直接分装即可。
将A组份和B组份按0.8∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
实施例5
(1)A组份的制备:
制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、氧化锌,m(AC):m(ZnO)=1:0.75,将氧化锌加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为150℃的改性偶氮二甲酰胺;在常温下,按照比例,将20份分子量为1000的聚氧化丙烯三醇、20份分子量为2000的聚氧化丙烯二醇、10份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇;10份己二酸系聚酯二醇、10份聚己内酯二醇加入反应釜中搅拌,搅拌分散2h,再加入添加上述改性的偶氮二甲酰胺4份,聚醚改性有机硅类泡沫稳定剂0.8份,搅拌分散15min,即可得到所述A组份产品。
(2)B组份制备
将工业商品多亚甲基多苯基多异氰酸酯(PM)直接分装即可。
将A组份和B组份按0.3∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
实施例6
(1)A组份的制备:
制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、过氧化锌,m(AC):m(ZnO2)=1:1,将过氧化锌加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为160℃的改性偶氮二甲酰胺;在常温下,按照比例,将10份分子量为1000的聚氧化丙烯三醇、10份分子量为2000的聚氧化丙烯二醇和10份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入添加上述改性的偶氮二甲酰胺3.5份,聚醚改性有机硅类泡沫稳定剂0.6份,搅拌分散20min,即可得到所述A组份产品。
(2)B组份制备
将工业商品2,4-甲苯二异氰酸酯直接分装即可。
将A组份和B组份按0.5∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
实施例7
(1)A组份的制备:制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、碳酸锌和尿素,m(AC):m(ZnCO3):m(CO(NH2)2)=1:0.35:0.35,将碳酸锌和尿素分别加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为140℃的改性偶氮二甲酰胺;在常温下,按照比例,将5份分子量为1000的聚氧化丙烯三醇、5份分子量为2000的聚氧化丙烯二醇、5份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇和5份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入添加上述改性的偶氮二甲酰胺5份,聚醚改性有机硅类泡沫稳定剂0.8份,搅拌分散30min,即可得到所述A组份产品。
(2)B组份制备
将工业商品二苯基甲烷二异氰酸酯(MDI)直接分装即可。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
对比例1-2用于评价改性偶氮二甲酰胺对发泡胶黏剂性能的影响
对比例1:与实施例7相比,不使用改性偶氮二甲酰胺,其他条件相同,具体如下:
(1)A组份的制备:在常温下,按照比例,将5份分子量为1000的聚氧化丙烯三醇、5份分子量为2000的聚氧化丙烯二醇、5份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇和5份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,即可得到所述A组份产品。
(2)B组份制备
将工业商品二苯基甲烷二异氰酸酯(MDI)直接分装即可。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
对比例2:与实施例7相比,使用环戊烷代替改性偶氮二甲酰胺,其他条件相同,具体如下:
(1)A组份的制备:在常温下,按照比例,将5份分子量为1000的聚氧化丙烯三醇、5份分子量为2000的聚氧化丙烯二醇、5份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇和5份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入环戊烷5份,聚醚改性有机硅类泡沫稳定剂0.8份,搅拌分散30min,即可得到所述A组份产品。
(2)B组份制备
将工业商品二苯基甲烷二异氰酸酯(MDI)直接分装即可。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
对比例3:与实施例7相比,使用偶氮二甲酰胺代替改性偶氮二甲酰胺,其他条件相同,具体如下:
(1)A组份的制备:在常温下,按照比例,将5份分子量为1000的聚氧化丙烯三醇、5份分子量为2000的聚氧化丙烯二醇、5份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇和5份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入偶氮二甲酰胺5份,聚醚改性有机硅类泡沫稳定剂0.8份,搅拌分散30min,即可得到所述A组份产品。
(2)B组份制备
将工业商品二苯基甲烷二异氰酸酯(MDI)直接分装即可。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
对比例4-5用与评价改性剂对发泡胶黏剂性能的影响
对比例4:与实施例7相比,参考中国专利CN106634784A使用改性剂对异氰酸酯进行改性,其他条件相同,具体如下:
(1)A组份的制备:制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、碳酸锌和尿素,m(AC):m(ZnCO3):m(CO(NH2)2)=1:0.35:0.35,将碳酸锌和尿素分别加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为140℃的改性偶氮二甲酰胺;在常温下,按照比例,将5份分子量为1000的聚氧化丙烯三醇、5份分子量为2000的聚氧化丙烯二醇、5份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇和5份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入添加上述改性的偶氮二甲酰胺5份,聚醚改性有机硅类泡沫稳定剂0.8份,搅拌分散30min,即可得到所述A组份产品。
(2)B组份制备
将10g聚乙二醇单甲醚(MPEG-600)、10g聚氧化丙烯二醇(DL-2000)混合加热至105℃,真空脱水4h,降温至60℃,加入1000g二苯基甲烷二异氰酸酯(MDI),反应3h生成改性二苯基甲烷二异氰酸酯。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
对比例5:与实施例7相比,参考中国专利CN106634784A使用改性剂对异氰酸酯进行改性,其他条件相同,具体如下:
(1)A组份的制备:制备改性的偶氮二甲酰胺:按比例取偶氮二甲酰胺(AC)、碳酸锌和尿素,m(AC):m(ZnCO3):m(CO(NH2)2)=1:0.35:0.35,将碳酸锌和尿素分别加入到偶氮二甲酰胺中并搅拌混合均匀,制备得分解温度为140℃的改性偶氮二甲酰胺;在常温下,按照比例,将5份分子量为1000的聚氧化丙烯三醇、5份分子量为2000的聚氧化丙烯二醇、5份分子量为3000的氧化乙烯-氧化丙烯的共聚醚三醇和5份分子量为3000的四氢呋喃-氧化丙烯的共聚醚二醇;5份己二酸系聚酯二醇、5份芳香族聚酯二醇、5份聚己内酯二醇加入反应釜中搅拌,搅拌分散1.5h,再加入添加上述改性的偶氮二甲酰胺5份,聚醚改性有机硅类泡沫稳定剂0.8份,搅拌分散30min,即可得到所述A组份产品。
(2)B组份制备
将10g聚四氢呋喃醚二醇、10g四氢呋喃-氧化乙烯共聚醚二醇混合加热至105℃,真空脱水4h,降温至60℃,加入1000g二苯基甲烷二异氰酸酯(MDI),反应3h生成改性二苯基甲烷二异氰酸酯(MDI)。
将A组份和B组份按0.7∶1的质量比混合均匀后,即得轻质刨花板用的复配发泡胶黏剂。
对比例6:与实施例7相比,采用工业商品脲醛树脂(UF),不添加其他物料。
结果与分析
本发明以桉木、松木刨花、发泡型胶黏剂(实例1-7,对比例1-6)等为原料,以热压压力2Mpa、热压时间为5min、热压温度为180℃、施胶量(表层:B组分6%;芯层:A组分3%、B组分6%)等为工艺参数,热压制备轻质刨花板,依据国家标准(GB/T4897-2015中P2型)对轻质刨花板相关指标进行测定,刨花板物理力学性能检测结果见表2。
表2轻质刨花板物理力学性能检测结果
由上述结果可知,对比例1-3在评价改性偶氮二甲酰胺对发泡胶黏剂性能的影响时发现,使用环戊烷、偶氮二甲酰胺等代替改性偶氮二甲酰胺或不使用改性偶氮二甲酰胺的情况下,复配发泡胶黏剂的胶合强度显著下降;在制备成轻质刨花板时发现:刨花板吸水厚度膨胀率增大,各项力学性能如静曲强度、弹性模量、内胶合强度、表面结合强度等下降明显;因此,本发明(实施例1-7)通过A组份的改性偶氮二甲酰胺、聚醚多元醇和聚酯多元醇与B组份的异氰酸酯反应形成聚氨酯泡沫,并对A组份的偶氮二甲酰胺进行改性,使其分解温度、发气速度和发气量达到最适合值,发泡分解产生气体,增大其发气量,与聚氨酯胶黏剂协同作用,以增大泡沫体系的流动性,使得泡沫迅速填充到刨花与刨花之间的间隙,将刨花牢固结合在一起,使刨花—胶黏剂—刨花之间形成良好的接触并在内部形成均匀的孔隙结构,从而保证了必要的胶合强度,获得了高强度和低密度的轻质刨花板,其压制板材的最小密度为0.44g/cm3,将该试验板材(0.44g/cm3)的物理力学性能与同密度的以脲醛树脂为胶黏剂压制的轻质刨花板进行比较,结果明显更好,性能满足国家标准(GB/T 4897-2015中P2型)的要求。
对比例4-5在评价改性剂对发泡胶黏剂性能的影响时发现,使用MPEG-600、DL-2000等改性剂对异氰酸酯进行改性时,复配发泡胶黏剂的胶合强度显著下降;在制备成发泡刨花板时发现:刨花板吸水厚度膨胀率增大,各项力学性能如静曲强度、弹性模量、内胶合强度、表面结合强度等下降明显。
对比例6在使用传统脲醛树脂胶黏剂压制轻质刨花板时,板材密度为0.44g/cm3时,其各项力学性能如静曲强度、弹性模量、内胶合强度、表面结合强度均未达到国家标准(GB/T4897-2015中P2型)的要求。
因此,本发明的组方为最优的组方,保证了复配发泡胶黏剂的胶合强度,使板材内部充满微孔而降低重量,降低了板材密度,节约了生产成本。
虽然,上文中已经用一般性说明、具体实施方式及试验,对本发明作了详尽的描述,但在本发明基础上,可以对之作一些修改或改进,这对本领域技术人员而言是显而易见的。因此,在不偏离本发明精神的基础上所做的这些修改或改进,均属于本发明要求保护的范围。
Claims (10)
1.一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述胶黏剂包括A组份和B组份,所述A组份包含聚醚多元醇、聚酯多元醇、改性偶氮二甲酰胺、泡沫稳定剂,所述B组份为异氰酸酯;所述A组份中各成分的重量份为:所述聚醚多元醇55-80份,所述聚酯多元醇6-25份,所述改性偶氮二甲酰胺2-5份,所述泡沫稳定剂0.2-1份,所述聚醚多元醇为聚氧化丙烯三醇、聚氧化丙烯二醇、氧化乙烯-氧化丙烯的共聚醚三醇和四氢呋喃氧化丙烯的共聚醚二醇中的一种或多种,所述聚酯多元醇为己二酸系聚酯二醇、芳香族聚酯二醇、聚己内酯二醇中的一种或多种,所述改性偶氮二甲酰胺为采用碳酸锌和尿素、醋酸锌和尿素、碳酸锌和柠檬酸、羟氨氯化锌、过氧化锌中的任一种或多种改性剂进行改性的偶氮二甲酰胺。
2.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述A组份中各成分的重量份为:所述聚醚多元醇60-70份;所述聚酯多元醇10-20份;所述改性偶氮二甲酰胺3-4份,所述泡沫稳定剂0.4-0.8份。
3.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述的A组份和B组份的质量比为:0.2-1:1。
4.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述的A组份和B组份的质量比为:0.3-0.8:1。
5.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述聚醚多元醇分子量为400-6000,官能度2-5。
6.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述聚酯多元醇分子量为1000-3000,官能度2-3。
7.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述改性偶氮二甲酰胺的分解温度为135-195℃。
8.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述泡沫稳定剂为聚醚改性有机硅类。
9.如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂,其特征在于,所述异氰酸酯为1,4-丁二异氰酸酯、异氰酸甲酯基-1,8-辛烷二异氰酸酯、1,5-萘二异氰酸酯、二苯基甲烷二异氰酸酯、多亚甲基多苯基多异氰酸酯、2,4-甲苯二异氰酸酯中的任一种或多种。
10.一种如权利要求1所述的一种轻质刨花板用的复配发泡胶黏剂的制备方法,其特征在于,所述制备方法包括以下步骤:
1)A组份制备
在常温下,按照比例,将聚醚多元醇、聚酯多元醇加入反应釜中搅拌,搅拌分散1-2h,再加入改性偶氮二甲酰胺、泡沫稳定剂,搅拌分散10-30min,即可得到所述A组份产品;
2)B组份制备
将工业商品直接分装即可;
3)所述A组份和所述B组份分离存放。
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