CN107199603A - 一种提高弯曲木衣架耐候性的加工方法 - Google Patents
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Abstract
本发明属于弯曲木衣架加工技术领域,具体涉及一种提高弯曲木衣架耐候性的加工方法,所述薄片有两种规格,在涂胶拼叠过程中交替叠放;所述涂胶主要原料为酚醛树脂,其中还包含改性木质素。本发明相比现有技术具有以下优点:安全环保的基础上提高了产品的耐候性,涂胶韧性好,粘合度强,避免使用淀粉类黏胶剂,从而防止了淀粉霉变等问题;两种不同厚度的木板交替拼叠,厚板有助于热压形状的保持,薄板有助于厚板之间更加紧密的粘结;在制作过程中,涂胶的使用提高了木质纤维的韧性,提高木料的耐水性,涂胶用于木料表面,能够提高木料内结合强度,提高贮能模量,耗散因子降低,配合提高了木料的抗变形能力和耐候能力。
Description
技术领域
本发明属于弯曲木衣架加工技术领域,具体涉及一种提高弯曲木衣架耐候性的加工方法。
背景技术
弯曲木家具与其他种类家具相比,有兼顾、轻巧、美观的特点,但最主要的区别还在于其特有的曲线、独有的优雅造型和弯曲弧度,能为:“横平竖直、四白落地”的空间增添流动的美感,弯曲木家具多以现代设计为主,设计极为简洁,造型上朴实大方,细节上则保留了弧线转角,线条饱满流畅的特点,同时,因其具有抗潮、抗扭、不开裂、不变形等特点,现已有采用木皮,制作线条流畅、美观时尚的衣架,由于衣架的使用特殊性,会容易出现吸潮或阳光长时间照射的情况,导致木片层与层之间的粘结力受到影响,进而变形,如何通过改变制作方法,提高产品的材料稳定性成了急需解决的问题。
发明内容
本发明的目的是针对现有的问题,提供了一种提高弯曲木衣架耐候性的加工方法。
本发明是通过以下技术方案实现的:一种提高弯曲木衣架耐候性的加工方法,包括木材切薄片、薄片烘干、涂胶拼叠形成多层胶合板、在电子高频加热机械压力机中压合成型、加工成型几个步骤,所述薄片有两种规格,一种厚度为0.05-0.08mm的薄板,一种为厚度为0.2-0.3mm的厚板,在涂胶拼叠过程中交替叠放,最上层和最下层均为薄板;所述涂胶主要原料为酚醛树脂,其中还包含相当于酚醛树脂重量40-60%的改性木质素;所述改性木质素为由pKa值接近7的胺为原料胺化改性所得木质素和由异氰酸酯为原料聚酯化改性所得木质素以重量比1:3-4组成。
作为对上述方案的进一步改进,所述木质素由造纸厂排放的黑夜中提取,提取后木质素含量为81.5-84.5%,水分为2.37-2.44%、灰分为7.96-8.13%。
作为对上述方案的进一步改进,所述涂胶的原料由以下重量份的原料组成:酚醛树脂100份、改性木质素40-60份、椰子壳油8-15份、香豆酮-茚树脂17-26份、草酸4-7份、石墨粉6-10份、萘硫酚1-5份、二甲基乙醇2-7份。
作为对上述方案的进一步改进,所述涂胶的制备方法包括以下步骤:
(1)将酚醛树脂、由异氰酸酯为原料聚酯化改性所得木质素、石墨粉、草酸在温度为90-95℃的条件下,搅拌反应1-1.5小时;
(2)在上述所得产物中加入剩余原料,在常温条件下放入研磨机中研磨,研磨3-4小时后得到涂胶。
作为对上述方案的进一步改进,薄板烘干后的含水率为6-8%,所述厚板烘干后的含水率为10-12%。
作为对上述方案的进一步改进,所述涂胶过程在厚板两面涂胶即可,涂胶量为240-320g/㎡。
所述异氰酸酯改性木质素能够提高醇羟基的数量,进而改善木质素与酚醛树脂的接枝反应;由pKa值接近7的胺为原料胺化改性所得木质素中含氮量高,能够生成木质素胺阳离子表面活性剂,能够使木质素具有强烈的反应活性,能够促进改性木质素与酚醛树脂的固化反应。
本发明相比现有技术具有以下优点:改性后的木质素与酚醛树脂固化过程中,与酚醛树脂中的分子链形成接枝共聚物,所得涂胶粘度、游离甲醛含量等性能均符合国家标准,且部分性能优于国家标准,其中涂胶热稳定性好,提高了木质素对酚醛树脂的取代量,有效解决了木质素的大量添加导致酚醛树脂的力学性能、热稳定性严重下降的问题,减少了游离甲醛含量,安全环保的基础上提高了产品的耐候性,涂胶韧性好,粘合度强,避免使用淀粉类黏胶剂,从而防止了淀粉霉变等问题;两种不同厚度的木板交替拼叠,厚板有助于热压形状的保持,薄板有助于厚板之间更加紧密的粘结;在制作过程中,涂胶的使用提高了木质纤维的韧性,木料中单宁能在高温状态下释放,提高木料的耐水性,涂胶用于木料表面,能够提高木料内结合强度,提高贮能模量,耗散因子降低,配合提高了木料的抗变形能力和耐候能力。
具体实施方式
实施例1
一种提高弯曲木衣架耐候性的加工方法,包括木材切薄片、薄片烘干、涂胶拼叠形成多层胶合板、在电子高频加热机械压力机中压合成型、加工成型几个步骤,所述薄片有两种规格,一种厚度为0.05-0.08mm的薄板,一种为厚度为0.2-0.3mm的厚板,在涂胶拼叠过程中交替叠放,最上层和最下层均为薄板;所述涂胶主要原料为酚醛树脂,其中还包含相当于酚醛树脂重量50%的改性木质素;所述改性木质素为由pKa值接近7的胺为原料胺化改性所得木质素和由异氰酸酯为原料聚酯化改性所得木质素以重量比1:3组成;
其中,薄板烘干后的含水率为7%,所述厚板烘干后的含水率为11%;所述涂胶过程在厚板两面涂胶即可,涂胶量为280g/㎡。
其中,所述木质素由造纸厂排放的黑夜中提取,提取后木质素含量为81.5-84.5%,水分为2.37-2.44%、灰分为7.96-8.13%。
其中,所述涂胶的原料由以下重量份的原料组成:酚醛树脂100份、改性木质素50份、椰子壳油12份、香豆酮-茚树脂22份、草酸6份、石墨粉8份、萘硫酚3份、二甲基乙醇5份。
其中,所述涂胶的制备方法包括以下步骤:
(1)将酚醛树脂、由异氰酸酯为原料聚酯化改性所得木质素、石墨粉、草酸在温度为90-95℃的条件下,搅拌反应1-1.5小时;
(2)在上述所得产物中加入剩余原料,在常温条件下放入研磨机中研磨,研磨3-4小时后得到涂胶。
实施例2
一种提高弯曲木衣架耐候性的加工方法,包括木材切薄片、薄片烘干、涂胶拼叠形成多层胶合板、在电子高频加热机械压力机中压合成型、加工成型几个步骤,所述薄片有两种规格,一种厚度为0.05-0.08mm的薄板,一种为厚度为0.2-0.3mm的厚板,在涂胶拼叠过程中交替叠放,最上层和最下层均为薄板;所述涂胶主要原料为酚醛树脂,其中还包含相当于酚醛树脂重量40%的改性木质素;所述改性木质素为由pKa值接近7的胺为原料胺化改性所得木质素和由异氰酸酯为原料聚酯化改性所得木质素以重量比1:4组成;
其中,薄板烘干后的含水率为8%,所述厚板烘干后的含水率为10%;所述涂胶过程在厚板两面涂胶即可,涂胶量为240-320g/㎡。
其中,所述涂胶的原料由以下重量份的原料组成:酚醛树脂100份、改性木质素40份、椰子壳油15份、香豆酮-茚树脂17份、草酸4份、石墨粉10份、萘硫酚5份、二甲基乙醇2份。
其余内容与实施例1中相同。
实施例3
一种提高弯曲木衣架耐候性的加工方法,包括木材切薄片、薄片烘干、涂胶拼叠形成多层胶合板、在电子高频加热机械压力机中压合成型、加工成型几个步骤,所述薄片有两种规格,一种厚度为0.05-0.08mm的薄板,一种为厚度为0.2-0.3mm的厚板,在涂胶拼叠过程中交替叠放,最上层和最下层均为薄板;所述涂胶主要原料为酚醛树脂,其中还包含相当于酚醛树脂重量60%的改性木质素;所述改性木质素为由pKa值接近7的胺为原料胺化改性所得木质素和由异氰酸酯为原料聚酯化改性所得木质素以重量比1:3组成;
其中,所述木质素由造纸厂排放的黑夜中提取,提取后木质素含量为81.5-84.5%,水分为2.37-2.44%、灰分为7.96-8.13%。
其中,所述涂胶的原料由以下重量份的原料组成:酚醛树脂100份、改性木质素60份、椰子壳油8份、香豆酮-茚树脂17份、草酸7份、石墨粉6份、萘硫酚1份、二甲基乙醇7份。
其余内容与实施例1中相同。
设置对照组1,将实施例1中薄片设为厚度为0.1-0.2mm的均匀木板,其余内容与实施例1中相同;设置对照组2,将实施例1中由pKa值接近7的胺为原料胺化改性所得木质素替换为由异氰酸酯为原料聚酯化改性所得木质素,其余内容不变;设置对照组3,将实施例1中由异氰酸酯为原料聚酯化改性所得木质素替换为由pKa值接近7的胺为原料胺化改性所得木质素,其余内容不变;设置对照组4,将实施例1中改性木质素替换为未改性木质素,其余内容不变;在试验中,各组木板以杨木为原材料进行实验,最外层表面用由市场购置的耐水、耐候漆进行涂刷,按照GB/T15036.2-2001中方法对各实施例中胶合强度进行检测,将成品放入80℃的水中浸泡,记录起鼓所用时间;其中耐候性的检测方法为,将产品在UVA-340紫外灯耐候试验箱中模拟自然环境的光照、温度、湿度,其黑暗时间根据GB/T16422.3-1997定为4h,辐照时间为4小时,实验总时间为80h,对实验后的产品胶合强度再次进行检测,计算其保持率,得到以下结果:
表1
组别 | 胶合强度(MPa)标准≥0.7 | 起鼓时间(h) | 胶合强度保持率(%) |
实施例1 | 1.96 | 22.5 | 83.6 |
实施例2 | 1.93 | 21.8 | 84.1 |
实施例3 | 1.95 | 22.3 | 83.9 |
对照组1 | 1.78 | 18.7 | 83.8 |
对照组2 | 1.43 | 11.8 | 65.4 |
对照组3 | 1.16 | 12.3 | 62.8 |
对照组4 | 0.84 | 10.2 | 47.5 |
从表1中可以看出,厚板和薄板交替设置,虽然会影响衣架的胶合强度和起鼓时间,但其胶合强度保持率较好;而改变改性木质素种类,不仅会影响衣架的物理性能,还会影响其耐候性;直接用木质素,导致木质素作为填充料使用,加入量的增加会严重影响胶合强度和起鼓时间;综上,本发明中方法制备的弯曲木衣架强度好,耐候性强。
Claims (6)
1.一种提高弯曲木衣架耐候性的加工方法,包括木材切薄片、薄片烘干、涂胶拼叠形成多层胶合板、在电子高频加热机械压力机中压合成型、加工成型几个步骤,其特征在于,所述薄片有两种规格,一种厚度为0.05-0.08mm的薄板,一种为厚度为0.2-0.3mm的厚板,在涂胶拼叠过程中交替叠放,最上层和最下层均为薄板;所述涂胶主要原料为酚醛树脂,其中还包含相当于酚醛树脂重量40-60%的改性木质素;所述改性木质素为由pKa值接近7的胺为原料胺化改性所得木质素和由异氰酸酯为原料聚酯化改性所得木质素以重量比1:3-4组成。
2.如权利要求1所述一种提高弯曲木衣架耐候性的加工方法,其特征在于,所述木质素由造纸厂排放的黑夜中提取,提取后木质素含量为81.5-84.5%,水分为2.37-2.44%、灰分为7.96-8.13%。
3.如权利要求1所述一种提高弯曲木衣架耐候性的加工方法,其特征在于,所述涂胶的原料由以下重量份的原料组成:酚醛树脂100份、改性木质素40-60份、椰子壳油8-15份、香豆酮-茚树脂17-26份、草酸4-7份、石墨粉6-10份、萘硫酚1-5份、二甲基乙醇2-7份。
4.如权利要求3所述一种提高弯曲木衣架耐候性的加工方法,其特征在于,所述涂胶的制备方法包括以下步骤:
(1)将酚醛树脂、由异氰酸酯为原料聚酯化改性所得木质素、石墨粉、草酸在温度为90-95℃的条件下,搅拌反应1-1.5小时;
(2)在上述所得产物中加入剩余原料,在常温条件下放入研磨机中研磨,研磨3-4小时后得到涂胶。
5.如权利要求1所述一种提高弯曲木衣架耐候性的加工方法,其特征在于,薄板烘干后的含水率为6-8%,所述厚板烘干后的含水率为10-12%。
6.如权利要求1所述一种提高弯曲木衣架耐候性的加工方法,其特征在于,所述涂胶过程在厚板两面涂胶即可,涂胶量为240-320g/㎡。
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